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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

// Contracts
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { ReentrancyGuard } from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

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

// Interfaces
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IveDPX } from "./IveDPX.sol";

/// @title Distributes rewards based on the claimer's veDPX balance
/// @notice Contract forked and modified from - https://etherscan.io/address/0xc6764e58b36e26b08Fd1d2AeD4538c02171fA872#code
contract veDPXYieldDistributor is Ownable, ReentrancyGuard {
  using SafeMath for uint256;
  using SafeERC20 for IERC20;

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

  // Instances
  IveDPX public veDPX;
  IERC20 public emittedToken;

  // Constant for price precision
  uint256 public constant PRICE_PRECISION = 1e6;

  // Yield and period related
  uint256 public periodFinish;
  uint256 public lastUpdateTime;
  uint256 public yieldRate;
  uint256 public yieldDuration = 604800; // 7 * 86400  (7 days)
  mapping(address => bool) public reward_notifiers;

  // Yield tracking
  uint256 public yieldPerVeDPXStored = 0;
  mapping(address => uint256) public userYieldPerTokenPaid;
  mapping(address => uint256) public yields;

  // veDPX tracking
  uint256 public totalVeDPXParticipating = 0;
  uint256 public totalVeDPXSupplyStored = 0;
  mapping(address => bool) public userIsInitialized;
  mapping(address => uint256) public userVeDPXCheckpointed;
  mapping(address => uint256) public userVeDPXEndpointCheckpointed;
  mapping(address => uint256) private lastRewardClaimTime; // staker addr -> timestamp

  // Greylists
  mapping(address => bool) public greylist;

  // Admin booleans for emergencies
  bool public yieldCollectionPaused = false; // For emergencies

  struct LockedBalance {
    int128 amount;
    uint256 end;
  }

  /* ========== MODIFIERS ========== */

  modifier notYieldCollectionPaused() {
    require(yieldCollectionPaused == false, "Yield collection is paused");
    _;
  }

  modifier checkpointUser(address account) {
    _checkpointUser(account);
    _;
  }

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

  constructor(address _emittedToken, address _veDPX_address) {
    emittedToken = IERC20(_emittedToken);

    veDPX = IveDPX(_veDPX_address);
    lastUpdateTime = block.timestamp;

    reward_notifiers[msg.sender] = true;
  }

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

  function fractionParticipating() external view returns (uint256) {
    return
      totalVeDPXParticipating.mul(PRICE_PRECISION).div(totalVeDPXSupplyStored);
  }

  // Only positions with locked veDPX can accrue yield. Otherwise, expired-locked veDPX
  // is de-facto rewards for DPX.
  function eligibleCurrentVeDPX(address account)
    public
    view
    returns (uint256 eligible_vedpx_bal, uint256 stored_ending_timestamp)
  {
    uint256 curr_vedpx_bal = veDPX.balanceOf(account);

    // Stored is used to prevent abuse
    stored_ending_timestamp = userVeDPXEndpointCheckpointed[account];

    // Only unexpired veDPX should be eligible
    if (
      stored_ending_timestamp != 0 &&
      (block.timestamp >= stored_ending_timestamp)
    ) {
      eligible_vedpx_bal = 0;
    } else if (block.timestamp >= stored_ending_timestamp) {
      eligible_vedpx_bal = 0;
    } else {
      eligible_vedpx_bal = curr_vedpx_bal;
    }
  }

  function lastTimeYieldApplicable() public view returns (uint256) {
    return Math.min(block.timestamp, periodFinish);
  }

  function yieldPerVeDPX() public view returns (uint256) {
    if (totalVeDPXSupplyStored == 0) {
      return yieldPerVeDPXStored;
    } else {
      return (
        yieldPerVeDPXStored.add(
          lastTimeYieldApplicable()
            .sub(lastUpdateTime)
            .mul(yieldRate)
            .mul(1e18)
            .div(totalVeDPXSupplyStored)
        )
      );
    }
  }

  function earned(address account) public view returns (uint256) {
    // Uninitialized users should not earn anything yet
    if (!userIsInitialized[account]) return 0;

    // Get eligible veDPX balances
    (
      uint256 eligible_current_vedpx,
      uint256 ending_timestamp
    ) = eligibleCurrentVeDPX(account);

    // If your veDPX is unlocked
    uint256 eligible_time_fraction = PRICE_PRECISION;
    if (eligible_current_vedpx == 0) {
      // And you already claimed after expiration
      if (lastRewardClaimTime[account] >= ending_timestamp) {
        // You get NOTHING. You LOSE. Good DAY ser!
        return 0;
      }
      // You haven't claimed yet
      else {
        uint256 eligible_time = (ending_timestamp).sub(
          lastRewardClaimTime[account]
        );
        uint256 total_time = (block.timestamp).sub(
          lastRewardClaimTime[account]
        );
        eligible_time_fraction = PRICE_PRECISION.mul(eligible_time).div(
          total_time
        );
      }
    }

    // If the amount of veDPX increased, only pay off based on the old balance
    // Otherwise, take the midpoint
    uint256 vedpx_balance_to_use;
    {
      uint256 old_vedpx_balance = userVeDPXCheckpointed[account];
      if (eligible_current_vedpx > old_vedpx_balance) {
        vedpx_balance_to_use = old_vedpx_balance;
      } else {
        vedpx_balance_to_use = ((eligible_current_vedpx).add(old_vedpx_balance))
          .div(2);
      }
    }

    return (
      vedpx_balance_to_use
        .mul(yieldPerVeDPX().sub(userYieldPerTokenPaid[account]))
        .mul(eligible_time_fraction)
        .div(1e18 * PRICE_PRECISION)
        .add(yields[account])
    );
  }

  function getYieldForDuration() external view returns (uint256) {
    return (yieldRate.mul(yieldDuration));
  }

  /* ========== MUTATIVE FUNCTIONS ========== */

  function _checkpointUser(address account) internal {
    // Need to retro-adjust some things if the period hasn't been renewed, then start a new one
    sync();

    // Calculate the earnings first
    _syncEarned(account);

    // Get the old and the new veDPX balances
    uint256 old_vedpx_balance = userVeDPXCheckpointed[account];
    uint256 new_vedpx_balance = veDPX.balanceOf(account);

    // Update the user's stored veDPX balance
    userVeDPXCheckpointed[account] = new_vedpx_balance;

    // Update the user's stored ending timestamp
    IveDPX.LockedBalance memory curr_locked_bal_pack = veDPX.locked(account);
    userVeDPXEndpointCheckpointed[account] = curr_locked_bal_pack.end;

    // Update the total amount participating
    if (new_vedpx_balance >= old_vedpx_balance) {
      uint256 weight_diff = new_vedpx_balance.sub(old_vedpx_balance);
      totalVeDPXParticipating = totalVeDPXParticipating.add(weight_diff);
    } else {
      uint256 weight_diff = old_vedpx_balance.sub(new_vedpx_balance);
      totalVeDPXParticipating = totalVeDPXParticipating.sub(weight_diff);
    }

    // Mark the user as initialized
    if (!userIsInitialized[account]) {
      userIsInitialized[account] = true;
      lastRewardClaimTime[account] = block.timestamp;
    }
  }

  function _syncEarned(address account) internal {
    if (account != address(0)) {
      uint256 earned0 = earned(account);
      yields[account] = earned0;
      userYieldPerTokenPaid[account] = yieldPerVeDPXStored;
    }
  }

  // Anyone can checkpoint another user
  function checkpointOtherUser(address user_addr) external {
    _checkpointUser(user_addr);
  }

  // Checkpoints the user
  function checkpoint() external {
    _checkpointUser(msg.sender);
  }

  function getYield()
    external
    nonReentrant
    notYieldCollectionPaused
    checkpointUser(msg.sender)
    returns (uint256 yield0)
  {
    require(greylist[msg.sender] == false, "Address has been greylisted");

    yield0 = yields[msg.sender];
    if (yield0 > 0) {
      yields[msg.sender] = 0;
      emittedToken.safeTransfer(msg.sender, yield0);
      emit YieldCollected(msg.sender, yield0);
    }

    lastRewardClaimTime[msg.sender] = block.timestamp;
  }

  function sync() public {
    // Update the total veDPX supply
    yieldPerVeDPXStored = yieldPerVeDPX();
    totalVeDPXSupplyStored = veDPX.totalSupply();
    lastUpdateTime = lastTimeYieldApplicable();
  }

  function notifyRewardAmount(uint256 amount) external {
    // Only whitelisted addresses can notify rewards
    require(reward_notifiers[msg.sender], "Sender not whitelisted");

    // Handle the transfer of emission tokens via `transferFrom` to reduce the number
    // of transactions required and ensure correctness of the emission amount
    emittedToken.safeTransferFrom(msg.sender, address(this), amount);

    // Update some values beforehand
    sync();

    // Update the new yieldRate
    if (block.timestamp >= periodFinish) {
      yieldRate = amount.div(yieldDuration);
    } else {
      uint256 remaining = periodFinish.sub(block.timestamp);
      uint256 leftover = remaining.mul(yieldRate);
      yieldRate = amount.add(leftover).div(yieldDuration);
    }

    // Update duration-related info
    lastUpdateTime = block.timestamp;
    periodFinish = block.timestamp.add(yieldDuration);

    emit RewardAdded(amount, yieldRate);
  }

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

  // Added to support recovering LP Yield and other mistaken tokens from other systems to be distributed to holders
  function recoverERC20(address tokenAddress, uint256 tokenAmount)
    external
    onlyOwner
  {
    // Only the owner address can ever receive the recovery withdrawal
    IERC20(tokenAddress).safeTransfer(owner(), tokenAmount);
    emit RecoveredERC20(tokenAddress, tokenAmount);
  }

  function setYieldDuration(uint256 _yieldDuration) external onlyOwner {
    require(
      periodFinish == 0 || block.timestamp > periodFinish,
      "Previous yield period must be complete before changing the duration for the new period"
    );
    yieldDuration = _yieldDuration;
    emit YieldDurationUpdated(yieldDuration);
  }

  function greylistAddress(address _address) external onlyOwner {
    greylist[_address] = !(greylist[_address]);
  }

  function toggleRewardNotifier(address notifier_addr) external onlyOwner {
    reward_notifiers[notifier_addr] = !reward_notifiers[notifier_addr];
  }

  function setPauses(bool _yieldCollectionPaused) external onlyOwner {
    yieldCollectionPaused = _yieldCollectionPaused;
  }

  function setYieldRate(uint256 _new_rate0, bool sync_too) external onlyOwner {
    yieldRate = _new_rate0;

    if (sync_too) {
      sync();
    }
  }

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

  event RewardAdded(uint256 reward, uint256 yieldRate);
  event YieldCollected(address indexed user, uint256 yield);
  event YieldDurationUpdated(uint256 newDuration);
  event RecoveredERC20(address token, uint256 amount);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// 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/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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));
        }
    }

    /**
     * @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 v4.5.0) (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

                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 v4.5.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @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 / b + (a % b == 0 ? 0 : 1);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

interface IveDPX {
  struct LockedBalance {
    int128 amount;
    uint256 end;
  }

  function commit_transfer_ownership(address addr) external;

  function apply_transfer_ownership() external;

  function commit_smart_wallet_checker(address addr) external;

  function apply_smart_wallet_checker() external;

  function toggleEmergencyUnlock() external;

  function recoverERC20(address token_addr, uint256 amount) external;

  function get_last_user_slope(address addr) external view returns (int128);

  function user_point_history__ts(address _addr, uint256 _idx)
    external
    view
    returns (uint256);

  function locked__end(address _addr) external view returns (uint256);

  function checkpoint() external;

  function deposit_for(address _addr, uint256 _value) external;

  function create_lock(uint256 _value, uint256 _unlock_time) external;

  function increase_amount(uint256 _value) external;

  function increase_unlock_time(uint256 _unlock_time) external;

  function withdraw() external;

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

  function balanceOf(address addr, uint256 _t) external view returns (uint256);

  function balanceOfAt(address addr, uint256 _block)
    external
    view
    returns (uint256);

  function totalSupply() external view returns (uint256);

  function totalSupply(uint256 t) external view returns (uint256);

  function totalSupplyAt(uint256 _block) external view returns (uint256);

  function totalFXSSupply() external view returns (uint256);

  function totalFXSSupplyAt(uint256 _block) external view returns (uint256);

  function changeController(address _newController) external;

  function token() external view returns (address);

  function supply() external view returns (uint256);

  function locked(address addr) external view returns (LockedBalance memory);

  function epoch() external view returns (uint256);

  function point_history(uint256 arg0)
    external
    view
    returns (
      int128 bias,
      int128 slope,
      uint256 ts,
      uint256 blk,
      uint256 fxs_amt
    );

  function user_point_history(address arg0, uint256 arg1)
    external
    view
    returns (
      int128 bias,
      int128 slope,
      uint256 ts,
      uint256 blk,
      uint256 fxs_amt
    );

  function user_point_epoch(address arg0) external view returns (uint256);

  function slope_changes(uint256 arg0) external view returns (int128);

  function controller() external view returns (address);

  function transfersEnabled() external view returns (bool);

  function emergencyUnlockActive() external view returns (bool);

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

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

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

  function decimals() external view returns (uint256);

  function future_smart_wallet_checker() external view returns (address);

  function smart_wallet_checker() external view returns (address);

  function admin() external view returns (address);

  function future_admin() external view returns (address);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000006c2c06790b3e3e3c38e12ee22f8183b37a13ee5500000000000000000000000080789d252a288e93b01d82373d767d71a75d9f16

-----Decoded View---------------
Arg [0] : _emittedToken (address): 0x6C2C06790b3E3E3c38e12Ee22F8183b37a13EE55
Arg [1] : _veDPX_address (address): 0x80789D252A288E93b01D82373d767D71a75D9F16

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000006c2c06790b3e3e3c38e12ee22f8183b37a13ee55
Arg [1] : 00000000000000000000000080789d252a288e93b01d82373d767d71a75d9f16