Token DPX Atlantic Straddle

 

Overview ERC-721

Total Supply:
232 DPX-ATLANTIC-STRADDLE-2

Holders:
208 addresses

Transfers:
-

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Contract Source Code Verified (Exact Match)

Contract Name:
AtlanticStraddle

Compiler Version
v0.8.17+commit.8df45f5f

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Unlicense license
File 1 of 26 : AccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

File 2 of 26 : IAccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

File 3 of 26 : Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

File 4 of 26 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 5 of 26 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

File 6 of 26 : draft-IERC20Permit.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

File 7 of 26 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

File 8 of 26 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256, /* firstTokenId */
        uint256 batchSize
    ) internal virtual {
        if (batchSize > 1) {
            if (from != address(0)) {
                _balances[from] -= batchSize;
            }
            if (to != address(0)) {
                _balances[to] += batchSize;
            }
        }
    }

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}
}

File 9 of 26 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

File 10 of 26 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 11 of 26 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev See {ERC721-_beforeTokenTransfer}.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, firstTokenId, batchSize);

        if (batchSize > 1) {
            // Will only trigger during construction. Batch transferring (minting) is not available afterwards.
            revert("ERC721Enumerable: consecutive transfers not supported");
        }

        uint256 tokenId = firstTokenId;

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

File 12 of 26 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 13 of 26 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 14 of 26 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

File 15 of 26 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 16 of 26 : Counters.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 17 of 26 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

File 18 of 26 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 19 of 26 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 20 of 26 : Math.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

File 21 of 26 : AtlanticStraddle.sol
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.7;

// Libraries
import {Counters} from "@openzeppelin/contracts/utils/Counters.sol";
import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import {ERC721Enumerable} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

// Contracts
import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import {Pausable} from "@openzeppelin/contracts/security/Pausable.sol";
import {ContractWhitelist} from "./helpers/ContractWhitelist.sol";
import {IAssetSwapper} from "./asset-swapper/IAssetSwapper.sol";

// Interfaces
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IOptionPricing} from "./interface/IOptionPricing.sol";
import {IPriceOracle} from "./interface/IPriceOracle.sol";
import {IVolatilityOracle} from "./interface/IVolatilityOracle.sol";

/// @title Atlantic Straddles
/// @author Dopex
/// @notice - Accept stable deposits
/// - Deposits during an epoch will be for the next epoch
/// - Stables are used as collateral to sell ATM put options for the underlying
/// - n day epochs, deposits auto-rollover unless deactivated
/// - Withdrawal considers performance of pool since deposit
/// - On purchase of an Atlantic straddle, use 50% of the collateral locked in the PUT to purchase underlying asset
/// - At expiry, settle by selling purchased underlying asset to return AP collateral
contract AtlanticStraddle is
    ReentrancyGuard,
    ERC721,
    ERC721Enumerable,
    AccessControl,
    Pausable,
    ContractWhitelist
{
    using SafeERC20 for IERC20;
    using Counters for Counters.Counter;

    /// @dev Token ID counter for write positions
    Counters.Counter private _tokenIdCounter;

    /// @dev Current epoch. 0-indexed
    uint256 public currentEpoch;

    /// @dev Managar Role
    bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE");

    /// @dev Contract addresses
    Addresses public addresses;

    /// @dev Total deposits for epoch (epoch => EpochData)
    mapping(uint256 => EpochData) public epochData;

    /// @dev Data for premium and funding collections for an epoch (epoch => EpochCollectionsData)
    mapping(uint256 => EpochCollectionsData) public epochCollectionsData;

    /// @dev Is vault ready for the epoch i.e can purchases begin (epoch => isVaultReady)
    mapping(uint256 => bool) public isVaultReady;

    /// @dev Toggled to true after an epoch has been marked pre-expired (epoch => isEpochPreExpired)
    mapping(uint256 => bool) public isEpochPreExpired;

    /// @dev Toggled to true after an epoch has been marked expired (epoch => isEpochExpired)
    mapping(uint256 => bool) public isEpochExpired;

    /// @dev Write positions (tokenId => WritePosition)
    mapping(uint256 => WritePosition) public writePositions;

    /// @dev Straddle positions (tokenId => StraddlePosition)
    mapping(uint256 => StraddlePosition) public straddlePositions;

    /// @dev Percentage precision
    uint256 public constant PERCENT_PRECISION = 1e6;

    /// @dev USDC decimals
    uint256 public constant USDC_DECIMALS = 1e6;

    /// @dev Min purchase 0.01 to prevent spam
    uint256 public constant MIN_PURCHASE_AMOUNT = 1e16;

    /// @dev Min deposit amount 1 usd to prevent spam
    uint256 public constant MIN_DEPOSIT_AMOUNT = USDC_DECIMALS;

    /// @dev Seconds a year
    uint256 internal constant SECONDS_A_YEAR = 365 days;

    /// @dev Purchase fee percent
    uint256 public purchaseFeePercent = 15e4;

    /// @dev Delegation fee
    uint256 public maxDelegationFee = USDC_DECIMALS;

    /// @dev Settlement fee percent
    uint256 public settlementFeePercent = 1e5;

    /// @dev AP funding percent
    uint256 public apFundingPercent = 36 * PERCENT_PRECISION;

    /// @dev Fee percent charged to owner, default to 0.1%
    uint256 public delegationFeePercent = PERCENT_PRECISION / 10;

    /// @dev Purchase time limit variable to prevent last min buyouts
    uint256 public blackoutPeriodBeforeExpiry = 4 hours;

    /// @dev PnL slippage percent
    uint256 public pnlSlippagePercent = 5e5;

    /// @dev The decimal precision for amount of options * strike price (or price)
    uint256 internal constant AMOUNT_PRICE_TO_USDC_DECIMALS =
        (1e18 * 1e8) / 1e6;

    struct Addresses {
        // USDC token (1e6 precision)
        address usd;
        // Underlying token
        address underlying;
        // Asset Swapper
        address assetSwapper;
        // Price Oracle
        address priceOracle;
        // Volatility Oracle
        address volatilityOracle;
        // Option Pricing
        address optionPricing;
        // Fee Distributor
        address feeDistributor;
    }

    struct EpochData {
        // Start time
        uint256 startTime;
        // Expiry time
        uint256 expiry;
        // Total USD deposits
        uint256 usdDeposits;
        // Active USD deposits (used for writing)
        uint256 activeUsdDeposits;
        // Settlement Price
        uint256 settlementPrice;
        // Percentage of total settlement executed
        uint256 settlementPercentage;
        // Amount of underlying assets purchased
        uint256 underlyingPurchased;
    }

    struct EpochCollectionsData {
        // Total premiums collected for USD deposits
        uint256 usdPremiums;
        // Total funding collected for USD deposits
        uint256 usdFunding;
        // Total amount of straddles sold
        uint256 totalSold;
        // Number of "live" straddles per epoch
        uint256 straddleCounter;
        // Final usd balance before withdraw
        uint256 finalUsdBalanceBeforeWithdaw;
    }

    struct WritePosition {
        // Epoch #
        uint256 epoch;
        // USD deposits
        uint256 usdDeposit;
        // Whether deposit should be rolled over to the next epoch
        bool rollover;
    }

    struct StraddlePosition {
        // Epoch #
        uint256 epoch;
        // Amount
        uint256 amount;
        // AP Strike
        uint256 apStrike;
        // Underlying purchased for this straddle
        uint256 underlyingPurchased;
    }

    event Bootstrap(uint256 epoch);

    event Deposit(
        uint256 epoch,
        uint256 amount,
        bool rollover,
        address user,
        address sender,
        uint256 tokenId
    );

    event Purchase(
        uint256 epoch,
        address user,
        uint256 straddleId,
        uint256 cost
    );

    event Settle(
        uint256 epoch,
        address indexed sender,
        address indexed owner,
        uint256 id,
        uint256 pnl
    );

    event Withdraw(
        uint256 epoch,
        address indexed sender,
        uint256 id,
        uint256 pnl
    );

    event ToggleRollover(uint256 id, bool rollover);

    event EpochExpired(address caller);

    event EpochPreExpired(address caller);

    event SetAddresses(Addresses addresses);

    event SetBlackoutPeriod(uint256 period);

    event SetApFunding(uint256 apFunding);

    event SetPnlSlippagePercent(uint256 pnlSlippagePercent);

    event SetFees(
        uint256 purchaseFeePercent,
        uint256 settlementFeePercent,
        uint256 delegationFeePercent,
        uint256 maxDelegationFee
    );

    event SetAssetSwapperAllowance(address token, uint256 value, bool increase);

    /*==== CONSTRUCTOR ====*/

    constructor(
        string memory _name,
        string memory _symbol,
        Addresses memory _addresses
    ) ERC721(_name, _symbol) {
        addresses = _addresses;

        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setupRole(MANAGER_ROLE, msg.sender);
    }

    /*==== USER METHODS ====*/

    /// @dev Deposit for next epoch
    /// @param amount Amount to deposit
    /// @param shouldRollover Should the deposit be rolled over
    /// @param user User address
    /// @return tokenId Write position token ID
    function deposit(
        uint256 amount,
        bool shouldRollover,
        address user
    ) external whenNotPaused nonReentrant returns (uint256 tokenId) {
        _isEligibleSender();
        require(amount > MIN_DEPOSIT_AMOUNT, "Invalid amount");

        uint256 nextEpoch = currentEpoch + 1;

        epochData[nextEpoch].usdDeposits += amount;
        epochCollectionsData[nextEpoch].finalUsdBalanceBeforeWithdaw += amount;

        tokenId = _mintPositionToken(user);

        writePositions[tokenId] = WritePosition({
            epoch: nextEpoch,
            usdDeposit: amount,
            rollover: shouldRollover
        });

        IERC20(addresses.usd).safeTransferFrom(
            msg.sender,
            address(this),
            amount
        );

        emit Deposit(
            nextEpoch,
            amount,
            shouldRollover,
            user,
            msg.sender,
            tokenId
        );
    }

    /// @dev Rolls over a deposit to the next epoch. Anyone can call this for write positions with `rollover` enabled
    /// Call this prior to bootstrapping to a new epoch or it will roll over to epoch n + 2
    /// @param id Write position token ID
    /// @return tokenId Rolled over write position token ID
    function rollover(uint256 id)
        public
        whenNotPaused
        nonReentrant
        returns (uint256 tokenId)
    {
        _isEligibleSender();
        WritePosition memory writePos = writePositions[id];

        require(writePos.rollover, "Rollover not authorized");
        require(writePos.epoch != 0, "Invalid write position");
        require(isEpochExpired[writePos.epoch], "Epoch has not expired");

        uint256 depositPlusPnl = calculateWritePositionPnl(id);

        address user = ownerOf(id);

        _burn(id);

        require(depositPlusPnl != 0, "Write position pnl is 0");

        uint256 delegationFee;

        // If the owner of the position is not the sender, collect rollover delegation fees
        if (user != msg.sender) {
            delegationFee =
                (depositPlusPnl * delegationFeePercent) /
                (PERCENT_PRECISION * 100);
            delegationFee = Math.min(delegationFee, maxDelegationFee);
        }

        depositPlusPnl -= delegationFee;

        emit Withdraw(writePos.epoch, user, id, depositPlusPnl);

        uint256 nextEpoch = currentEpoch + 1;

        epochData[nextEpoch].usdDeposits += depositPlusPnl;
        epochCollectionsData[nextEpoch]
            .finalUsdBalanceBeforeWithdaw += depositPlusPnl;

        tokenId = _mintPositionToken(user);

        writePositions[tokenId] = WritePosition({
            epoch: nextEpoch,
            usdDeposit: depositPlusPnl,
            rollover: true
        });

        IERC20(addresses.usd).safeTransfer(msg.sender, delegationFee);

        emit Deposit(nextEpoch, depositPlusPnl, true, user, user, tokenId);
    }

    /// @dev Rollover for multiple ids
    /// @param ids Write position token IDs
    /// @return tokenIds Rolled over write position token IDs
    function multirollover(uint256[] memory ids)
        external
        returns (uint256[] memory tokenIds)
    {
        uint256 idsLength = ids.length;
        tokenIds = new uint256[](idsLength);
        for (uint256 i; i < idsLength; ) {
            tokenIds[i] = rollover(ids[i]);

            unchecked {
                ++i;
            }
        }
    }

    /// @dev Toggle rollover for a write position
    /// @param id Write position token ID
    function toggleRollover(uint256 id) external whenNotPaused nonReentrant {
        _isEligibleSender();
        require(ownerOf(id) == msg.sender, "Invalid owner");
        require(writePositions[id].epoch != 0, "Invalid position");
        writePositions[id].rollover = !writePositions[id].rollover;
        emit ToggleRollover(id, writePositions[id].rollover);
    }

    /// @dev Withdraw write positions after strikes are settled
    /// @param id ID of write position
    /// @return writePositionPnl of write position
    function withdraw(uint256 id)
        external
        whenNotPaused
        nonReentrant
        returns (uint256 writePositionPnl)
    {
        _isEligibleSender();
        require(ownerOf(id) == msg.sender, "Invalid owner");

        WritePosition memory writePos = writePositions[id];

        require(writePos.epoch != 0, "Invalid write position");
        require(isEpochExpired[writePos.epoch], "Settlements not done");

        writePositionPnl = calculateWritePositionPnl(id);

        _burn(id);

        require(writePositionPnl != 0, "Write position pnl is 0");

        IERC20(addresses.usd).safeTransfer(msg.sender, writePositionPnl);

        emit Withdraw(writePos.epoch, msg.sender, id, writePositionPnl);
    }

    /// @dev Purchase a straddle
    /// @param amount Approx. amount of straddles to purchase (10 ** 18)
    /// @param swapperId Swapper ID of the swap method to use
    /// @param minAmountOut Min amount out for the underlying purchased
    /// @param user Address to purchase straddles for
    /// @return tokenId Straddle position token ID
    function purchase(
        uint256 amount,
        uint256 minAmountOut,
        uint256 swapperId,
        address user
    )
        external
        whenNotPaused
        nonReentrant
        returns (
            uint256 tokenId,
            uint256 protocolFee,
            uint256 straddleCost
        )
    {
        _isEligibleSender();
        require(currentEpoch > 0, "Invalid epoch");
        require(amount > MIN_PURCHASE_AMOUNT, "Invalid amount");
        require(
            block.timestamp <
                epochData[currentEpoch].expiry - blackoutPeriodBeforeExpiry,
            "Cannot purchase during blackout period"
        );

        uint256 currentPrice = getUnderlyingPrice();
        uint256 timeToExpiry = epochData[currentEpoch].expiry - block.timestamp;

        require(
            epochData[currentEpoch].usdDeposits -
                (epochData[currentEpoch].activeUsdDeposits /
                    AMOUNT_PRICE_TO_USDC_DECIMALS) >=
                (currentPrice * amount) / AMOUNT_PRICE_TO_USDC_DECIMALS,
            "Not enough AP liquidity available"
        );

        // Swap half of AP to underlying
        uint256 underlyingPurchased = _swapToUnderlying(
            ((currentPrice * amount) / 2) / AMOUNT_PRICE_TO_USDC_DECIMALS,
            minAmountOut,
            swapperId
        );
        epochCollectionsData[currentEpoch].finalUsdBalanceBeforeWithdaw -=
            ((currentPrice * amount) / 2) /
            AMOUNT_PRICE_TO_USDC_DECIMALS;

        uint256 swapPrice = (currentPrice * amount) / (underlyingPurchased * 2);

        epochData[currentEpoch].underlyingPurchased += underlyingPurchased;

        // Deposits
        epochData[currentEpoch].activeUsdDeposits +=
            swapPrice *
            (underlyingPurchased * 2);

        uint256 apPremium = calculatePremium(
            true,
            swapPrice,
            swapPrice,
            underlyingPurchased * 2,
            epochData[currentEpoch].expiry
        );

        uint256 apFunding = calculateApFunding(
            swapPrice,
            underlyingPurchased * 2,
            timeToExpiry
        );

        // Collections
        epochCollectionsData[currentEpoch].usdPremiums += apPremium;
        epochCollectionsData[currentEpoch].usdFunding += apFunding;
        epochCollectionsData[currentEpoch].totalSold += underlyingPurchased * 2;
        epochCollectionsData[currentEpoch].straddleCounter += 1;

        // Mint straddle position token
        tokenId = _mintPositionToken(user);
        straddlePositions[tokenId] = StraddlePosition({
            epoch: currentEpoch,
            amount: underlyingPurchased * 2,
            apStrike: swapPrice,
            underlyingPurchased: underlyingPurchased
        });

        protocolFee =
            (amount * currentPrice * purchaseFeePercent) /
            (PERCENT_PRECISION * AMOUNT_PRICE_TO_USDC_DECIMALS * 100);

        straddleCost = ((apPremium + apFunding) /
            AMOUNT_PRICE_TO_USDC_DECIMALS);

        IERC20(addresses.usd).safeTransferFrom(
            msg.sender,
            address(this),
            straddleCost + protocolFee
        );

        IERC20(addresses.usd).safeTransfer(
            addresses.feeDistributor,
            protocolFee
        );

        epochCollectionsData[currentEpoch]
            .finalUsdBalanceBeforeWithdaw += ((apPremium + apFunding) /
            AMOUNT_PRICE_TO_USDC_DECIMALS);

        emit Purchase(currentEpoch, user, tokenId, apPremium + apFunding);
    }

    /// @dev Settles a purchased option
    /// @param id ID of straddle position
    function settle(uint256 id)
        public
        whenNotPaused
        nonReentrant
        returns (uint256)
    {
        _isEligibleSender();

        StraddlePosition memory sp = straddlePositions[id];
        require(sp.epoch != 0, "Invalid straddle position");
        require(isEpochPreExpired[sp.epoch], "Epoch has not pre-expired");

        uint256 buyerPnl = calculateStraddlePositionPnl(id);
        address owner = ownerOf(id);

        _burn(id);

        require(buyerPnl != 0, "buyerPnl cannot be 0");

        uint256 protocolFee = (buyerPnl * settlementFeePercent) /
            (PERCENT_PRECISION * 100);
        uint256 delegationFee;

        // If owner did not settle, collect settlement fees
        if (owner != msg.sender) {
            delegationFee =
                (buyerPnl * delegationFeePercent) /
                (PERCENT_PRECISION * 100);
            delegationFee = Math.min(delegationFee, maxDelegationFee);
        }

        buyerPnl -= (protocolFee + delegationFee);

        epochCollectionsData[sp.epoch].straddleCounter -= 1;
        epochCollectionsData[sp.epoch]
            .finalUsdBalanceBeforeWithdaw -= (buyerPnl +
            protocolFee +
            delegationFee);

        IERC20(addresses.usd).safeTransfer(
            addresses.feeDistributor,
            protocolFee
        );
        IERC20(addresses.usd).safeTransfer(owner, buyerPnl);
        IERC20(addresses.usd).safeTransfer(msg.sender, delegationFee);

        emit Settle(sp.epoch, msg.sender, owner, id, buyerPnl);

        return buyerPnl;
    }

    /// @dev Settle for multiple ids
    /// @param ids Straddle position token IDs
    /// @return pnls pnls
    function multisettle(uint256[] memory ids)
        external
        returns (uint256[] memory pnls)
    {
        uint256 idsLength = ids.length;
        pnls = new uint256[](idsLength);

        for (uint256 i; i < idsLength; ) {
            pnls[i] = settle(ids[i]);

            unchecked {
                ++i;
            }
        }
    }

    /*==== INTERNAL METHODS ====*/

    /// @dev Internal function to mint a write position token
    /// @param to the address to mint the position to
    function _mintPositionToken(address to) private returns (uint256 tokenId) {
        tokenId = _tokenIdCounter.current();
        _tokenIdCounter.increment();
        _safeMint(to, tokenId);
    }

    /// @dev Internal function to swap USD to underlying tokens
    /// @param amount Amount of USD to swap
    /// @param minAmountOut The min amount out
    /// @param swapperId Swapper ID
    function _swapToUnderlying(
        uint256 amount,
        uint256 minAmountOut,
        uint256 swapperId
    ) internal returns (uint256 underlyingPurchased) {
        underlyingPurchased = IAssetSwapper(addresses.assetSwapper).swapAsset(
            addresses.usd,
            addresses.underlying,
            amount,
            minAmountOut,
            swapperId
        );
    }

    /// @dev Internal function to swap underlying tokens to USD
    /// @param amount Amount of underlying tokens to swap
    /// @param minAmountOut The min amount out
    /// @param swapperId Swapper ID
    function _swapFromUnderlying(
        uint256 amount,
        uint256 minAmountOut,
        uint256 swapperId
    ) internal returns (uint256 usdObtained) {
        usdObtained = IAssetSwapper(addresses.assetSwapper).swapAsset(
            addresses.underlying,
            addresses.usd,
            amount,
            minAmountOut,
            swapperId
        );
    }

    /*==== VIEWS ====*/

    /// @notice Returns the price of the underlying in USD in 1e8 precision
    function getUnderlyingPrice() public view returns (uint256) {
        return IPriceOracle(addresses.priceOracle).getUnderlyingPrice();
    }

    /// @notice Returns the volatility from the volatility oracle
    /// @param _strike Strike of the option
    function getVolatility(uint256 _strike) public view returns (uint256) {
        return
            IVolatilityOracle(addresses.volatilityOracle).getVolatility(
                _strike
            );
    }

    /// @notice Calculate premium for an option
    /// @param _isPut Is put option
    /// @param _price Price of the underlying
    /// @param _strike Strike price of the option
    /// @param _amount Amount of options (1e18 precision)
    /// @param _expiry Expiry of the option
    /// @return premium in USD
    function calculatePremium(
        bool _isPut,
        uint256 _price,
        uint256 _strike,
        uint256 _amount,
        uint256 _expiry
    ) public view returns (uint256 premium) {
        premium = (IOptionPricing(addresses.optionPricing).getOptionPrice(
            _isPut,
            _expiry,
            _strike,
            _price,
            getVolatility(_strike)
        ) * _amount);
    }

    /// @notice Calculate premium for an option
    /// @param _price Price of the asset
    /// @param _amount Amount of options (1e18 precision)
    /// @param _timeToExpiry Time to expiry
    function calculateApFunding(
        uint256 _price,
        uint256 _amount,
        uint256 _timeToExpiry
    ) public view returns (uint256 funding) {
        funding =
            (((_price * apFundingPercent * _timeToExpiry * _amount) /
                (SECONDS_A_YEAR * PERCENT_PRECISION)) / 100) /
            2;
    }

    /// @notice Calculates the writer position pnl
    /// @param id the id of the write position
    /// @return writePositionPnl
    function calculateWritePositionPnl(uint256 id)
        public
        view
        returns (uint256 writePositionPnl)
    {
        WritePosition memory writePos = writePositions[id];
        require(writePos.epoch != 0, "Invalid write position");

        writePositionPnl =
            (writePos.usdDeposit *
                epochCollectionsData[writePos.epoch]
                    .finalUsdBalanceBeforeWithdaw) /
            epochData[writePos.epoch].usdDeposits;
    }

    /// @param id ID of straddle position
    /// @return buyerPnl positive pnl of buyer
    function calculateStraddlePositionPnl(uint256 id)
        public
        view
        returns (uint256 buyerPnl)
    {
        StraddlePosition memory sp = straddlePositions[id];

        require(sp.epoch != 0, "Invalid straddle position");

        uint256 settlementPrice = epochData[sp.epoch].settlementPrice;
        uint256 strikePrice = sp.apStrike;

        // straddle pnl = max(K - S, 0) + 0.5 * (S - K)
        // if K > S, get (K - S) - 0.5 * (K - S)
        if (strikePrice > settlementPrice) {
            buyerPnl = (strikePrice - settlementPrice) * sp.amount;
            buyerPnl -=
                (strikePrice - settlementPrice) *
                sp.underlyingPurchased;
        } else {
            // else get 0 + 0.5 * (S - K)
            buyerPnl +=
                (settlementPrice - strikePrice) *
                sp.underlyingPurchased;
        }

        buyerPnl /= AMOUNT_PRICE_TO_USDC_DECIMALS;
        buyerPnl -= (buyerPnl * pnlSlippagePercent) / (100 * PERCENT_PRECISION);
    }

    /// @notice Returns the tokenIds owned by a wallet (writePositions)
    /// @param owner wallet owner
    function writePositionsOfOwner(address owner)
        public
        view
        returns (uint256[] memory tokenIds)
    {
        uint256 ownerTokenCount = balanceOf(owner);
        uint256 count;

        for (uint256 i; i < ownerTokenCount; ) {
            uint256 tokenId = tokenOfOwnerByIndex(owner, i);
            if (writePositions[tokenId].epoch != 0) {
                ++count;
            }

            unchecked {
                ++i;
            }
        }

        tokenIds = new uint256[](count);
        uint256 start;
        uint256 idx;

        while (start < count) {
            uint256 tokenId = tokenOfOwnerByIndex(owner, idx);
            if (writePositions[tokenId].epoch != 0) {
                tokenIds[start] = tokenId;
                ++start;
            }
            ++idx;
        }
    }

    /// @notice Returns the tokenIds owned by a wallet (straddlePositions)
    /// @param owner wallet owner
    function straddlePositionsOfOwner(address owner)
        public
        view
        returns (uint256[] memory tokenIds)
    {
        uint256 ownerTokenCount = balanceOf(owner);
        uint256 count;

        for (uint256 i; i < ownerTokenCount; ) {
            uint256 tokenId = tokenOfOwnerByIndex(owner, i);
            if (straddlePositions[tokenId].epoch != 0) {
                ++count;
            }

            unchecked {
                ++i;
            }
        }

        tokenIds = new uint256[](count);
        uint256 start;
        uint256 idx;

        while (start < count) {
            uint256 tokenId = tokenOfOwnerByIndex(owner, idx);
            if (straddlePositions[tokenId].epoch != 0) {
                tokenIds[start] = tokenId;
                ++start;
            }
            ++idx;
        }
    }

    /*==== MANAGER METHODS ====*/

    /// @dev Bootstrap and start the next epoch for purchases
    /// @param expiry Expiry
    function bootstrap(uint256 expiry)
        external
        whenNotPaused
        onlyRole(MANAGER_ROLE)
        returns (bool)
    {
        uint256 nextEpoch = currentEpoch + 1;
        require(
            block.timestamp < expiry,
            "Expiry cannot be before current time"
        );
        require(
            currentEpoch == 0 || !isVaultReady[nextEpoch],
            "Cannot bootstrap when vault is ready"
        );
        if (currentEpoch > 0) {
            require(
                isEpochExpired[currentEpoch],
                "Cannot bootstrap before the current epoch was expired & settled"
            );
        }

        // Set expiry in epoch data
        epochData[nextEpoch].startTime = block.timestamp;
        epochData[nextEpoch].expiry = expiry;
        // Mark vault as ready for epoch
        isVaultReady[nextEpoch] = true;
        // Increase the current epoch
        currentEpoch = nextEpoch;

        emit Bootstrap(nextEpoch);

        return true;
    }

    /// @dev Swap a certain percentage of total purchased underlying
    /// @param percentage percentage of underlying to swap in 1e6
    /// @param minAmountOut the min amount out
    /// @param swapperId Swapper ID of the swap method to use with AssetSwapper
    function preExpireEpoch(
        uint256 percentage,
        uint256 minAmountOut,
        uint256 swapperId
    ) external whenNotPaused onlyRole(MANAGER_ROLE) returns (bool) {
        EpochData memory data = epochData[currentEpoch];
        require(percentage > 0, "Percentage cannot be 0");
        require(
            block.timestamp >= data.expiry,
            "Time is not past epoch expiry"
        );
        require(
            !isEpochPreExpired[currentEpoch],
            "Epoch was already pre-expired"
        );
        require(!isEpochExpired[currentEpoch], "Epoch was already expired");
        require(
            data.settlementPercentage + percentage <= (100 * PERCENT_PRECISION),
            "You cannot swap more than 100%"
        );

        // Swap all purchased underlying at current price
        uint256 underlyingToSwap = (data.underlyingPurchased * percentage) /
            (100 * PERCENT_PRECISION);

        uint256 normalizedSettlementPrice;

        if (underlyingToSwap > 0) {
            uint256 usdObtained = _swapFromUnderlying(
                underlyingToSwap,
                minAmountOut,
                swapperId
            );
            epochCollectionsData[currentEpoch]
                .finalUsdBalanceBeforeWithdaw += usdObtained;

            uint256 settlementPrice = (usdObtained *
                AMOUNT_PRICE_TO_USDC_DECIMALS) / underlyingToSwap;

            normalizedSettlementPrice =
                ((data.settlementPrice * data.settlementPercentage) +
                    (settlementPrice * percentage)) /
                (data.settlementPercentage + percentage);

            epochData[currentEpoch].settlementPercentage += percentage;
        } else {
            normalizedSettlementPrice = getUnderlyingPrice();

            epochData[currentEpoch].settlementPercentage =
                100 *
                PERCENT_PRECISION;
        }

        if (epochData[currentEpoch].settlementPrice == 0) {
            epochData[currentEpoch].settlementPrice = normalizedSettlementPrice;
        } else {
            epochData[currentEpoch].settlementPrice = Math.min(
                epochData[currentEpoch].settlementPrice,
                normalizedSettlementPrice
            );
        }

        if (
            epochData[currentEpoch].settlementPercentage >
            (99 * PERCENT_PRECISION)
        ) {
            isEpochPreExpired[currentEpoch] = true;
        }

        emit EpochPreExpired(msg.sender);

        return true;
    }

    /// @dev Expire epoch and set the settlement price
    function expireEpoch()
        external
        whenNotPaused
        onlyRole(MANAGER_ROLE)
        returns (bool expired)
    {
        require(
            block.timestamp >= epochData[currentEpoch].expiry,
            "Time is not past epoch expiry"
        );
        require(isEpochPreExpired[currentEpoch], "Epoch has not pre-expired");
        require(!isEpochExpired[currentEpoch], "Epoch was already expired");

        if (epochCollectionsData[currentEpoch].straddleCounter == 0) {
            isEpochExpired[currentEpoch] = true;
            expired = true;
        } else {
            revert("All settlements have not been processed");
        }

        emit EpochExpired(msg.sender);
    }

    /*==== ADMIN METHODS ====*/

    /// @notice Sets the addresses used in the contract
    /// @dev Can only be called by admin
    /// @param _addresses Addresses
    function setAddresses(Addresses memory _addresses)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        addresses = _addresses;
        emit SetAddresses(_addresses);
    }

    /// @notice Change blackout period before expiry
    /// @dev Can only be called by governance
    function setBlackoutPeriodBeforeExpiry(uint256 period)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
        returns (bool)
    {
        require(period > 1 hours, "Blackout period must be more than 1 hour");
        blackoutPeriodBeforeExpiry = period;
        emit SetBlackoutPeriod(period);
        return true;
    }

    /// @notice Sets the apFunding
    /// @dev Can only be called by admin
    /// @param _apFundingPercent funding percentage number between 1% and 100%
    function setApFunding(uint256 _apFundingPercent)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        require(_apFundingPercent > 0, "Funding rate must be greater than 0");
        apFundingPercent = _apFundingPercent;
        emit SetApFunding(_apFundingPercent);
    }

    /// @notice Sets the pnlSlippagePercent
    /// @dev Can only be called by admin
    /// @param _pnlSlippagePercent The pnl slippage percent
    function setPnlSlippagePercent(uint256 _pnlSlippagePercent)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        require(_pnlSlippagePercent > 0, "Funding rate must be greater than 0");
        pnlSlippagePercent = _pnlSlippagePercent;
        emit SetPnlSlippagePercent(_pnlSlippagePercent);
    }

    /// @notice Sets the purchase/settlement fee percent
    /// @dev Can only be called by admin
    /// @param _purchaseFeePercent Purchase fee percent
    /// @param _settlementFeePercent Settlement fee percent
    /// @param _delegationFeePercent Delegation fee percent
    /// @param _maxDelegationFee Max delegation fee for settlements and rollovers
    function setFees(
        uint256 _purchaseFeePercent,
        uint256 _settlementFeePercent,
        uint256 _delegationFeePercent,
        uint256 _maxDelegationFee
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(
            _purchaseFeePercent > 0 &&
                _settlementFeePercent > 0 &&
                _delegationFeePercent > 0 &&
                _maxDelegationFee > 0,
            "Values must be greater than 0"
        );
        purchaseFeePercent = _purchaseFeePercent;
        settlementFeePercent = _settlementFeePercent;
        delegationFeePercent = _delegationFeePercent;
        maxDelegationFee = _maxDelegationFee;
        emit SetFees(
            _purchaseFeePercent,
            _settlementFeePercent,
            _delegationFeePercent,
            _maxDelegationFee
        );
    }

    /// @notice Sets the allowance of the asset swapper
    /// @dev Can only be called by admin
    /// @param _token The token to set allowance for
    /// @param _value The amount of allowance
    /// @param _increase Whether to increase or decrease allowance
    function setAssetSwapperAllowance(
        address _token,
        uint256 _value,
        bool _increase
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (_increase) {
            IERC20(_token).safeIncreaseAllowance(
                addresses.assetSwapper,
                _value
            );
        } else {
            IERC20(_token).safeDecreaseAllowance(
                addresses.assetSwapper,
                _value
            );
        }

        emit SetAssetSwapperAllowance(_token, _value, _increase);
    }

    /// @notice Pauses the vault for emergency cases
    /// @dev Can only be called by admin
    function pause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _pause();
    }

    /// @notice Unpauses the vault
    /// @dev Can only be called by admin
    function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _unpause();
    }

    /// @notice Add a contract to the whitelist
    /// @dev Can only be called by the owner
    /// @param _contract Address of the contract that needs to be added to the whitelist
    function addToContractWhitelist(address _contract)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        _addToContractWhitelist(_contract);
    }

    /// @notice Remove a contract to the whitelist
    /// @dev Can only be called by the owner
    /// @param _contract Address of the contract that needs to be removed from the whitelist
    function removeFromContractWhitelist(address _contract)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        _removeFromContractWhitelist(_contract);
    }

    /// @notice Transfers all funds to msg.sender
    /// @dev Can only be called by admin
    /// @param tokens The list of erc20 tokens to withdraw
    /// @param transferNative Whether should transfer the native currency
    function emergencyWithdraw(address[] calldata tokens, bool transferNative)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
        whenPaused
    {
        if (transferNative) {
            payable(msg.sender).transfer(address(this).balance);
        }

        for (uint256 i; i < tokens.length; ) {
            IERC20 token = IERC20(tokens[i]);
            token.safeTransfer(msg.sender, token.balanceOf(address(this)));

            unchecked {
                ++i;
            }
        }
    }

    // The following functions are overrides required by Solidity.
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId,
        uint256 batchSize
    ) internal override(ERC721, ERC721Enumerable) {
        super._beforeTokenTransfer(from, to, tokenId, batchSize);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, ERC721Enumerable, AccessControl)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}

File 22 of 26 : IAssetSwapper.sol
// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.0;

interface IAssetSwapper {
    function swapAsset(
        address from,
        address to,
        uint256 amount,
        uint256 minAmountOut,
        uint256 swapperId
    ) external returns (uint256);
}

File 23 of 26 : ContractWhitelist.sol
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

/// @title ContractWhitelist
/// @author witherblock
/// @notice A helper contract that lets you add a list of whitelisted contracts that should be able to interact with restricited functions
abstract contract ContractWhitelist {
    /// @dev contract => whitelisted or not
    mapping(address => bool) public whitelistedContracts;

    /*==== SETTERS ====*/

    /// @dev add to the contract whitelist
    /// @param _contract the address of the contract to add to the contract whitelist
    function _addToContractWhitelist(address _contract) internal {
        require(isContract(_contract), "Address must be a contract");
        require(
            !whitelistedContracts[_contract],
            "Contract already whitelisted"
        );

        whitelistedContracts[_contract] = true;

        emit AddToContractWhitelist(_contract);
    }

    /// @dev remove from  the contract whitelist
    /// @param _contract the address of the contract to remove from the contract whitelist
    function _removeFromContractWhitelist(address _contract) internal {
        require(whitelistedContracts[_contract], "Contract not whitelisted");

        whitelistedContracts[_contract] = false;

        emit RemoveFromContractWhitelist(_contract);
    }

    // modifier is eligible sender modifier
    function _isEligibleSender() internal view {
        // the below condition checks whether the caller is a contract or not
        if (msg.sender != tx.origin)
            require(
                whitelistedContracts[msg.sender],
                "Contract must be whitelisted"
            );
    }

    /*==== VIEWS ====*/

    /// @dev checks for contract or eoa addresses
    /// @param addr the address to check
    /// @return bool whether the passed address is a contract address
    function isContract(address addr) public view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(addr)
        }
        return size > 0;
    }

    /*==== EVENTS ====*/

    event AddToContractWhitelist(address indexed _contract);

    event RemoveFromContractWhitelist(address indexed _contract);
}

File 24 of 26 : IOptionPricing.sol
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.7;

interface IOptionPricing {
    function getOptionPrice(
        bool isPut,
        uint256 expiry,
        uint256 strike,
        uint256 lastPrice,
        uint256 baseIv
    ) external view returns (uint256);
}

File 25 of 26 : IPriceOracle.sol
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.7;

interface IPriceOracle {
    function getCollateralPrice() external view returns (uint256);

    function getUnderlyingPrice() external view returns (uint256);
}

File 26 of 26 : IVolatilityOracle.sol
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.7;

interface IVolatilityOracle {
    function getVolatility(uint256) external view returns (uint256);
}

Settings
{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"components":[{"internalType":"address","name":"usd","type":"address"},{"internalType":"address","name":"underlying","type":"address"},{"internalType":"address","name":"assetSwapper","type":"address"},{"internalType":"address","name":"priceOracle","type":"address"},{"internalType":"address","name":"volatilityOracle","type":"address"},{"internalType":"address","name":"optionPricing","type":"address"},{"internalType":"address","name":"feeDistributor","type":"address"}],"internalType":"struct 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

Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : _name (string): DPX Atlantic Straddle
Arg [1] : _symbol (string): DPX-ATLANTIC-STRADDLE-2
Arg [2] : _addresses (tuple): System.Collections.Generic.List`1[Nethereum.ABI.FunctionEncoding.ParameterOutput]

-----Encoded View---------------
13 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000160
Arg [2] : 000000000000000000000000ff970a61a04b1ca14834a43f5de4533ebddb5cc8
Arg [3] : 0000000000000000000000006c2c06790b3e3e3c38e12ee22f8183b37a13ee55
Arg [4] : 000000000000000000000000c7679e9e8198e6020d9b6854a066a368e4d2aa1a
Arg [5] : 00000000000000000000000058bc6da61a00310ebc519fcf8c0d55493c529341
Arg [6] : 000000000000000000000000b6645813567bb5beea8f62e793d075fe6d3be0b1
Arg [7] : 0000000000000000000000002b99e3d67dad973c1b9747da742b7e26c8bdd67b
Arg [8] : 00000000000000000000000055594cce8cc0014ea08c49fd820d731308f204c1
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000015
Arg [10] : 4450582041746c616e746963205374726164646c650000000000000000000000
Arg [11] : 0000000000000000000000000000000000000000000000000000000000000017
Arg [12] : 4450582d41544c414e5449432d5354524144444c452d32000000000000000000


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