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// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.16;

// Interfaces
import {IERC20 as OZERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {ISsovV3} from "../core/ISsovV3.sol";

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

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

/***
 * Deposit SSOV V3 deposit positions (ERC721) to earn rewards.
 * Rewards earned are based on strike of the position.
 */

interface IERC20 is OZERC20 {
    function decimals() external view returns (uint256);
}

contract SsovV3StakingRewards is
    AccessControl,
    ContractWhitelist,
    Pausable,
    ReentrancyGuard
{
    using SafeERC20 for IERC20;

    /* ========== STATE VARIABLES ========== */

    bytes32 public constant MANAGER_ROLE =
        keccak256(abi.encodePacked("MANAGER_ROLE"));

    struct RewardInfo {
        uint256 rewardAmount;
        uint256 periodFinish;
        uint256 rewardRate;
        uint256 rewardRateStored;
        uint256 lastUpdateTime;
        uint256 totalSupply;
        uint256 decimalsPrecision;
        IERC20 rewardToken;
    }

    struct StakedPosition {
        uint256[] rewardRateStored;
        uint256[] rewardsPaid;
        uint256 stakeAmount;
        bool staked;
    }

    /**
     * @notice Staked positions of users.
     * @dev    hash(ssov, positionId, epoch) => SsovUserPosition
     */
    mapping(bytes32 => StakedPosition) private stakedPositions;

    /**
     * @notice Rewards related data for each ssov
     * @dev    hash(ssov, strike, epoch) => RewardInfo
     */
    mapping(bytes32 => RewardInfo[]) private ssovRewardStrikeInfo;

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

    /* ========== PUBLIC METHODS ========== */

    /// @notice      Allows to stake the staking token into the contract for rewards
    /// @param _ssov Address of the SSOV of the deposit position
    /// @param _id   ID of the deposit position
    function stake(
        address _ssov,
        uint _id
    ) external whenNotPaused nonReentrant {
        _isEligibleSender();

        ISsovV3 ssov = ISsovV3(_ssov);

        if (ssov.ownerOf(_id) != msg.sender) revert NotOwnerOfWritePosition();

        uint256 currentEpoch = ssov.currentEpoch();

        (uint256 epoch, uint256 strike, uint256 amount, , ) = ssov
            .writePosition(_id);

        if (epoch != currentEpoch) revert NotCurrentEpoch();

        if (ssov.getEpochData(epoch).expiry <= block.timestamp) {
            revert SsovEpochExpired();
        }

        bytes32 _positionId = getId(_ssov, _id, epoch);
        bytes32 _rewardInfoId = getId(_ssov, strike, epoch);

        if (stakedPositions[_positionId].staked) {
            revert SsovPositionAlreadyStaked();
        }

        _updateUserPositionAndRewards(_rewardInfoId, _positionId, amount);

        emit SsovPositionStaked(_ssov, _id, amount);
    }

    /**
     * @notice          Claim rewards of a staked position.
     * @param _ssov     Address of the ssov vault
     * @param _id       ID of the write position.
     * @param _receiver Address of the reward tokens receiver.
     */
    function claim(
        address _ssov,
        uint256 _id,
        address _receiver
    ) external whenNotPaused nonReentrant {
        _isEligibleSender();
        _claim(_id, _ssov, _receiver);
    }

    /**
     * @notice             Claim rewards for multiple staked positions.
     * @param _positionIds IDs of the write positions staked.
     * @param _ssov        Address of the SSOV.
     * @param _receiver    Address of the receiver.
     */
    function multiClaim(
        uint256[] calldata _positionIds,
        address _ssov,
        address _receiver
    ) external whenNotPaused nonReentrant {
        for (uint256 i; i < _positionIds.length; ) {
            _claim(_positionIds[i], _ssov, _receiver);
            unchecked {
                ++i;
            }
        }
    }

    /* ========== VIEW FUNCTIONS ========== */

    /**
     * @notice             Returns information about rewards.
     * @param id           ID from ssovRewardStrikeInfo mapping.
     * @return _rewardInfo Information about the rewards.
     */
    function getSsovEpochStrikeRewardsInfo(
        bytes32 id
    ) public view returns (RewardInfo[] memory _rewardInfo) {
        _rewardInfo = new RewardInfo[](ssovRewardStrikeInfo[id].length);
        _rewardInfo = ssovRewardStrikeInfo[id];
        return _rewardInfo;
    }

    /**
     * @notice             Returns information about rewards.
     * @param  _ssov       Address of the ssov.
     * @param  _strike     Strike of the ssov.
     * @param  _epoch      Epoch of the ssov.
     * @return _rewardInfo Information about the rewards.
     */
    function getSsovEpochStrikeRewardsInfo(
        address _ssov,
        uint256 _strike,
        uint256 _epoch
    ) external view returns (RewardInfo[] memory _rewardInfo) {
        bytes32 rewardsInfoId = getId(_ssov, _strike, _epoch);
        return getSsovEpochStrikeRewardsInfo(rewardsInfoId);
    }

    /**
     *
     * @notice                 Get user staked position information.
     * @param id               ID of the staked position from stakedPositions mapping.
     * @return _stakedPosition Information about the staked position.
     */
    function getUserStakedPosition(
        bytes32 id
    ) external view returns (StakedPosition memory _stakedPosition) {
        _stakedPosition = stakedPositions[id];
    }

    /**
     * @param _ssov  Address of the SSOV
     * @param _uint1 Strike | ssov position ID
     * @param _uint2 Epoch
     */
    function getId(
        address _ssov,
        uint256 _uint1,
        uint256 _uint2
    ) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(_ssov, _uint1, _uint2));
    }

    /**
     * @notice               Get rewards earned by a write position.
     * @param  _ssov         Address of the ssov.
     * @return rewardTokens  Array of reward tokens.
     * @return rewardAmounts Array of reward amounts.
     */
    function earned(
        address _ssov,
        uint256 _positionId
    )
        external
        view
        returns (address[] memory rewardTokens, uint256[] memory rewardAmounts)
    {
        (uint epoch, uint256 strike, , , ) = ISsovV3(_ssov).writePosition(
            _positionId
        );

        bytes32 stakedPositionId = getId(_ssov, _positionId, epoch);
        if (stakedPositions[stakedPositionId].staked) {
            bytes32 rewardsInfoId = getId(_ssov, strike, epoch);
            uint256 len = ssovRewardStrikeInfo[rewardsInfoId].length;

            rewardTokens = new address[](len);
            rewardAmounts = new uint256[](len);

            IERC20 rewardToken;
            uint256 rewardAmount;
            for (uint256 i; i < len; ) {
                (, rewardAmount, , rewardToken) = earned(
                    rewardsInfoId,
                    stakedPositionId,
                    i
                );

                rewardTokens[i] = address(rewardToken);
                rewardAmounts[i] = rewardAmount;

                unchecked {
                    ++i;
                }
            }
        }
    }

    /**
     * @notice                    Get Amount of rewards and reward tokens earned.
     * @return rewardRate         New rate of reward distribution.
     * @return earnedRewards      Amount of earned reward tokens.
     * @return lastApplicableTime Last applicable time updated.
     * @return rewardToken        Address of the reward token.
     */
    function earned(
        bytes32 _rewardsInfoId,
        bytes32 _positionId,
        uint256 _index
    )
        public
        view
        returns (
            uint256 rewardRate,
            uint256 earnedRewards,
            uint256 lastApplicableTime,
            IERC20 rewardToken
        )
    {
        StakedPosition memory _stakedPosition = stakedPositions[_positionId];

        RewardInfo memory _rewardInfo = ssovRewardStrikeInfo[_rewardsInfoId][
            _index
        ];

        uint256 rewardsCollected = _getRewardsCollected(_rewardInfo);

        rewardRate =
            (rewardsCollected * _rewardInfo.decimalsPrecision) /
            _rewardInfo.totalSupply;

        rewardRate = _rewardInfo.rewardRateStored + rewardRate;

        earnedRewards =
            ((
                ((rewardRate - _stakedPosition.rewardRateStored[_index]) *
                    _stakedPosition.stakeAmount)
            ) / _rewardInfo.decimalsPrecision) -
            _stakedPosition.rewardsPaid[_index];

        rewardToken = _rewardInfo.rewardToken;

        lastApplicableTime = Math.min(
            _rewardInfo.periodFinish,
            block.timestamp
        );
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    /**
     * @notice              Add rewards for an ssov for given strike and current epoch.
     * @param _ssov         Address of the ssov.
     * @param _strike       Strike to set rewards for.
     * @param _rewardToken  Address of the reward token.
     * @param _rewardAmount Amount of reward token to set.
     */
    function addRewards(
        address _ssov,
        uint256 _strike,
        address _rewardToken,
        uint256 _rewardAmount
    ) public onlyRole(MANAGER_ROLE) {
        if (_rewardToken == address(0)) {
            revert ZeroAddress();
        }
        ISsovV3 ssov = ISsovV3(_ssov);
        IERC20 rewardToken = IERC20(_rewardToken);
        uint256 epoch = ssov.currentEpoch();
        bytes32 id = getId(_ssov, _strike, epoch);

        RewardInfo memory _rewardInfo;

        _rewardInfo.periodFinish = ssov.getEpochData(epoch).expiry;

        if (_rewardInfo.periodFinish <= block.timestamp) {
            revert SsovEpochExpired();
        }

        _rewardInfo.rewardAmount = _rewardAmount;
        _rewardInfo.rewardToken = rewardToken;
        _rewardInfo.lastUpdateTime = block.timestamp;
        _rewardInfo.rewardRate =
            _rewardAmount /
            (_rewardInfo.periodFinish - block.timestamp);
        _rewardInfo.decimalsPrecision =
            10 ** _rewardInfo.rewardToken.decimals();

        ssovRewardStrikeInfo[id].push(_rewardInfo);

        rewardToken.safeTransferFrom(msg.sender, address(this), _rewardAmount);

        emit SsovStrikeRewardsSet(_ssov, _strike, epoch, _rewardInfo);
    }

    /**
     * @notice              Add rewards for multiple strikes of an ssov.
     * @param _ssov         Address of the ssov.
     * @param _strikes      Strikes to set rewards for.
     * @param _rewardToken  Address of the reward token.
     * @param _rewardAmount Amount of reward token to set.
     */
    function addSingleRewardsForMultipleStrikes(
        address _ssov,
        uint256[] calldata _strikes,
        address _rewardToken,
        uint256 _rewardAmount
    ) external onlyRole(MANAGER_ROLE) {
        for (uint256 i; i < _strikes.length; ) {
            addRewards(_ssov, _strikes[i], _rewardToken, _rewardAmount);

            unchecked {
                ++i;
            }
        }
    }

    /**
     * @notice               Add rewards of multiple amounts for multiple
     *                       strikes of an ssov.
     * @param _ssov          Address of the ssov.
     * @param _strikes       Strikes to set rewards for.
     * @param _rewardToken   Address of the reward token.
     * @param _rewardAmounts Amounts of reward token to set.
     */
    function addMultipleRewardsForMultipleStrikes(
        address _ssov,
        uint256[] calldata _strikes,
        address _rewardToken,
        uint256[] calldata _rewardAmounts
    ) external onlyRole(MANAGER_ROLE) {
        for (uint256 i; i < _strikes.length; ) {
            addRewards(_ssov, _strikes[i], _rewardToken, _rewardAmounts[i]);

            unchecked {
                ++i;
            }
        }
    }

    /// @notice               Transfers all funds to msg.sender
    /// @dev                  Can only be called by the owner
    /// @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 whenPaused onlyRole(DEFAULT_ADMIN_ROLE) returns (bool) {
        if (transferNative) payable(msg.sender).transfer(address(this).balance);

        IERC20 token;

        for (uint256 i = 0; i < tokens.length; i++) {
            token = IERC20(tokens[i]);
            token.safeTransfer(msg.sender, token.balanceOf(address(this)));
        }

        emit EmergencyWithdraw(msg.sender);

        return true;
    }

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

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

    /// @notice Pauses the contract
    /// @dev    Can only be called by the owner
    function pause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _pause();
    }

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

    /* ========== PRIVATE FUNCTIONS ========== */

    function _claim(uint256 _id, address _ssov, address _receiver) private {
        if (_receiver == address(0)) {
            revert ZeroAddress();
        }

        (uint epoch, uint256 strike, , , ) = ISsovV3(_ssov).writePosition(_id);

        bytes32 positionId = getId(_ssov, _id, epoch);
        bytes32 rewardsInfoId = getId(_ssov, strike, epoch);

        if (!stakedPositions[positionId].staked) {
            revert NotStaked();
        }

        if (ISsovV3(_ssov).ownerOf(_id) != msg.sender) {
            revert NotOwnerOfWritePosition();
        }

        uint256 len = ssovRewardStrikeInfo[rewardsInfoId].length;

        if (len == 0) {
            revert RewardsNotSet();
        }

        uint256 rewardRate;
        uint256 earnedRewards;
        uint256 lastApplicableTime;
        IERC20 rewardToken;

        for (uint256 i; i < len; ) {
            (
                rewardRate,
                earnedRewards,
                lastApplicableTime,
                rewardToken
            ) = earned(rewardsInfoId, positionId, i);

            ssovRewardStrikeInfo[rewardsInfoId][i]
                .rewardRateStored = rewardRate;

            ssovRewardStrikeInfo[rewardsInfoId][i]
                .lastUpdateTime = lastApplicableTime;

            stakedPositions[positionId].rewardsPaid[i] += earnedRewards;

            rewardToken.safeTransfer(_receiver, earnedRewards);

            emit Claimed(earnedRewards, _id, _ssov, address(rewardToken));

            unchecked {
                ++i;
            }
        }

        if (ISsovV3(_ssov).getEpochData(epoch).expiry <= block.timestamp) {
            delete stakedPositions[positionId];
        }
    }

    function _updateUserPositionAndRewards(
        bytes32 _rewardsInfoId,
        bytes32 _positionId,
        uint256 _amount
    ) private {
        uint256 len = ssovRewardStrikeInfo[_rewardsInfoId].length;
        if (len == 0) {
            revert RewardsNotSet();
        }

        StakedPosition memory _stakedPosition;
        RewardInfo memory _rewardInfo;

        uint256 rewardsCollected;

        _stakedPosition.staked = true;
        _stakedPosition.rewardRateStored = new uint256[](len);
        _stakedPosition.rewardsPaid = new uint256[](len);
        _stakedPosition.stakeAmount = _amount;

        uint256 rewardRate;

        for (uint256 i; i < len; ) {
            _rewardInfo = ssovRewardStrikeInfo[_rewardsInfoId][i];

            rewardsCollected = _getRewardsCollected(_rewardInfo);

            if (_rewardInfo.totalSupply != 0) {
                rewardRate =
                    (rewardsCollected * _rewardInfo.decimalsPrecision) /
                    _rewardInfo.totalSupply;

                _stakedPosition.rewardRateStored[i] =
                    rewardRate +
                    _rewardInfo.rewardRateStored;

                _rewardInfo.rewardRateStored = _stakedPosition.rewardRateStored[
                    i
                ];

                _rewardInfo.lastUpdateTime = Math.min(
                    block.timestamp,
                    _rewardInfo.periodFinish
                );
            }

            _rewardInfo.totalSupply += _amount;
            ssovRewardStrikeInfo[_rewardsInfoId][i] = _rewardInfo;

            unchecked {
                ++i;
            }
        }

        stakedPositions[_positionId] = _stakedPosition;
    }

    function _getRewardsCollected(
        RewardInfo memory _rewardInfo
    ) private view returns (uint256 rewardsCollected) {
        rewardsCollected =
            _rewardInfo.rewardRate *
            (Math.min(_rewardInfo.periodFinish, block.timestamp) -
                _rewardInfo.lastUpdateTime);
    }

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

    event SsovStrikeRewardsSet(
        address ssov,
        uint256 strike,
        uint256 epoch,
        RewardInfo rewardInfo
    );
    event SsovPositionStaked(address ssov, uint256 id, uint256 amount);
    event EmergencyWithdraw(address sender);
    event Staked(
        address indexed user,
        uint256 positionId,
        address ssov,
        uint256 strike,
        uint256 amount
    );
    event Claimed(
        uint256 rewardAmount,
        uint256 positionId,
        address ssov,
        address rewardToken
    );

    /* ========== ERRORS ========== */

    error SsovPositionAlreadyStaked();
    error NotOwnerOfWritePosition();
    error NotCurrentEpoch();
    error InvalidArrayLengths();
    error SsovEpochExpired();
    error RewardsNotSet();
    error NotStaked();
    error FullRewardsClaimed();
    error RewardsAlreadySet();
    error ZeroAddress();
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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(uint160(account), 20),
                        " 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());
        }
    }
}

// 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;
}

// 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());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// 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);
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * 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);
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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);
            }
        }
    }
}

// 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_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) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @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] = _HEX_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);
    }
}

// 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;
    }
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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. It 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)`.
        // We also know that `k`, the position of the most significant bit, is such that `msb(a) = 2**k`.
        // This gives `2**k < a <= 2**(k+1)` → `2**(k/2) <= sqrt(a) < 2 ** (k/2+1)`.
        // Using an algorithm similar to the msb conmputation, we are able to compute `result = 2**(k/2)` which is a
        // good first aproximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1;
        uint256 x = a;
        if (x >> 128 > 0) {
            x >>= 128;
            result <<= 64;
        }
        if (x >> 64 > 0) {
            x >>= 64;
            result <<= 32;
        }
        if (x >> 32 > 0) {
            x >>= 32;
            result <<= 16;
        }
        if (x >> 16 > 0) {
            x >>= 16;
            result <<= 8;
        }
        if (x >> 8 > 0) {
            x >>= 8;
            result <<= 4;
        }
        if (x >> 4 > 0) {
            x >>= 4;
            result <<= 2;
        }
        if (x >> 2 > 0) {
            result <<= 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) {
        uint256 result = sqrt(a);
        if (rounding == Rounding.Up && result * result < a) {
            result += 1;
        }
        return result;
    }
}

//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

// Interfaces
import {IERC721Enumerable} from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
import {IERC20} from "../external/interfaces/IERC20.sol";

// Structs
import {Addresses, EpochData, EpochStrikeData, VaultCheckpoint} from "./SsovV3Structs.sol";

/// @title SSOV V3 interface
interface ISsovV3 is IERC721Enumerable {
    function isPut() external view returns (bool);

    function currentEpoch() external view returns (uint256);

    function collateralPrecision() external view returns (uint256);

    function addresses() external view returns (Addresses memory);

    function collateralToken() external view returns (IERC20);

    function deposit(
        uint256 strikeIndex,
        uint256 amount,
        address to
    ) external returns (uint256 tokenId);

    function purchase(
        uint256 strikeIndex,
        uint256 amount,
        address to
    ) external returns (uint256 premium, uint256 totalFee);

    function settle(
        uint256 strikeIndex,
        uint256 amount,
        uint256 epoch,
        address to
    ) external returns (uint256 pnl);

    function withdraw(uint256 tokenId, address to)
        external
        returns (
            uint256 collateralTokenWithdrawAmount,
            uint256[] memory rewardTokenWithdrawAmounts
        );

    function getUnderlyingPrice() external view returns (uint256);

    function getCollateralPrice() external view returns (uint256);

    function getVolatility(uint256 _strike) external view returns (uint256);

    function calculatePremium(
        uint256 _strike,
        uint256 _amount,
        uint256 _expiry
    ) external view returns (uint256 premium);

    function calculatePnl(
        uint256 price,
        uint256 strike,
        uint256 amount,
        uint256 collateralExchangeRate
    ) external view returns (uint256);

    function calculatePurchaseFees(uint256 strike, uint256 amount)
        external
        view
        returns (uint256);

    function calculateSettlementFees(uint256 pnl)
        external
        view
        returns (uint256);

    function getEpochTimes(uint256 epoch)
        external
        view
        returns (uint256 start, uint256 end);

    function writePosition(uint256 tokenId)
        external
        view
        returns (
            uint256 epoch,
            uint256 strike,
            uint256 collateralAmount,
            uint256 checkpointIndex,
            uint256[] memory rewardDistributionRatios
        );

    function getEpochData(uint256 epoch)
        external
        view
        returns (EpochData memory);

    function getEpochStrikeData(uint256 epoch, uint256 strike)
        external
        view
        returns (EpochStrikeData memory);

    function getEpochStrikeCheckpointsLength(uint256 epoch, uint256 strike)
        external
        view
        returns (uint256);

    function checkpoints(
        uint256 epoch,
        uint256 strike,
        uint256 index
    ) external view returns (VaultCheckpoint memory);
}

//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

struct Addresses {
    address feeStrategy;
    address stakingStrategy;
    address optionPricing;
    address priceOracle;
    address volatilityOracle;
    address feeDistributor;
    address optionsTokenImplementation;
}

struct EpochData {
    bool expired;
    uint256 startTime;
    uint256 expiry;
    uint256 settlementPrice;
    uint256 totalCollateralBalance; // Premium + Deposits from all strikes
    uint256 collateralExchangeRate; // Exchange rate for collateral to underlying (Only applicable to CALL options)
    uint256 settlementCollateralExchangeRate; // Exchange rate for collateral to underlying on settlement (Only applicable to CALL options)
    uint256[] strikes;
    uint256[] totalRewardsCollected;
    uint256[] rewardDistributionRatios;
    address[] rewardTokensToDistribute;
}

struct EpochStrikeData {
    address strikeToken;
    uint256 totalCollateral;
    uint256 activeCollateral;
    uint256 totalPremiums;
    uint256 checkpointPointer;
    uint256[] rewardStoredForPremiums;
    uint256[] rewardDistributionRatiosForPremiums;
}

struct VaultCheckpoint {
    uint256 activeCollateral;
    uint256 totalCollateral;
    uint256 accruedPremium;
}

struct WritePosition {
    uint256 epoch;
    uint256 strike;
    uint256 collateralAmount;
    uint256 checkpointIndex;
    uint256[] rewardDistributionRatios;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 * NOTE: Modified to include symbols and decimals.
 */
interface IERC20 {
  function totalSupply() external view returns (uint256);

  function symbol() external view returns (string memory);

  function decimals() external view returns (uint8);

  function balanceOf(address account) external view returns (uint256);

  function transfer(address recipient, uint256 amount) external returns (bool);

  function allowance(address owner, address spender)
    external
    view
    returns (uint256);

  function approve(address spender, uint256 amount) external returns (bool);

  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) external returns (bool);

  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

//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);
}

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

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