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// SPDX-License-Identifier: MIT
pragma solidity ^0.7.5;

import "./lib/Ownable.sol";
import "./lib/SafeERC20.sol";
import "./lib/ReentrancyGuard.sol";
import "./lib/SafeMath.sol";
import "./lib/EnumerableSet.sol";

import "./interfaces/IDividends.sol";
import "./interfaces/IGMVDTokenUsage.sol";
import "./interfaces/IWETH.sol";


/*
 * This contract is used to distribute dividends to users that allocated gMVD here
 *
 * Dividends can be distributed in the form of one or more tokens
 * They are mainly managed to be received from the FeeManager contract, but other sources can be added (dev wallet for instance)
 *
 * The freshly received dividends are stored in a pending slot
 *
 * The content of this pending slot will be progressively transferred over time into a distribution slot
 * This distribution slot is the source of the dividends distribution to gMVD allocators during the current cycle
 *
 * This transfer from the pending slot to the distribution slot is based on cycleDividendsPercent and CYCLE_PERIOD_SECONDS
 *
 */
contract Dividends is Ownable, ReentrancyGuard, IGMVDTokenUsage, IDividends {
  using SafeMath for uint256;
  using SafeERC20 for IERC20;
  using EnumerableSet for EnumerableSet.AddressSet;

  struct UserInfo {
    uint256 pendingDividends;
    uint256 rewardDebt;
  }

  struct DividendsInfo {
    uint256 currentDistributionAmount; // total amount to distribute during the current cycle
    uint256 currentCycleDistributedAmount; // amount already distributed for the current cycle (times 1e2)
    uint256 pendingAmount; // total amount in the pending slot, not distributed yet
    uint256 distributedAmount; // total amount that has been distributed since initialization
    uint256 accDividendsPerShare; // accumulated dividends per share (times 1e9)
    uint256 lastUpdateTime; // last time the dividends distribution occurred
    uint256 cycleDividendsPercent; // fixed part of the pending dividends to assign to currentDistributionAmount on every cycle
    bool distributionDisabled; // deactivate a token distribution (for temporary dividends)
  }

  // actively distributed tokens
  EnumerableSet.AddressSet private _distributedTokens;
  uint256 public constant MAX_DISTRIBUTED_TOKENS = 10;
  address public immutable weth;
  // dividends info for every dividends token
  mapping(address => DividendsInfo) public dividendsInfo;
  mapping(address => mapping(address => UserInfo)) public users;

  address public immutable gMVDToken; // gMVDToken contract

  mapping(address => uint256) public usersAllocation; // User's gMVD allocation
  uint256 public totalAllocation; // Contract's total gMVD allocation

  uint256 public constant MIN_CYCLE_DIVIDENDS_PERCENT = 1; // 0.01%
  uint256 public constant DEFAULT_CYCLE_DIVIDENDS_PERCENT = 100; // 1%
  uint256 public constant MAX_CYCLE_DIVIDENDS_PERCENT = 10000; // 100%
  // dividends will be added to the currentDistributionAmount on each new cycle
  uint256 internal _cycleDurationSeconds = 7 days;
  uint256 public currentCycleStartTime;

  constructor(address gMVDToken_, uint256 startTime_, address weth_) {
    require(gMVDToken_ != address(0), "zero address");
    gMVDToken = gMVDToken_;
    currentCycleStartTime = startTime_;
    weth = weth_;
  }

  /********************************************/
  /****************** EVENTS ******************/
  /********************************************/

  event UserUpdated(address indexed user, uint256 previousBalance, uint256 newBalance);
  event DividendsCollected(address indexed user, address indexed token, uint256 amount);
  event CycleDividendsPercentUpdated(address indexed token, uint256 previousValue, uint256 newValue);
  event DividendsAddedToPending(address indexed token, uint256 amount);
  event DistributedTokenDisabled(address indexed token);
  event DistributedTokenRemoved(address indexed token);
  event DistributedTokenEnabled(address indexed token);

  /***********************************************/
  /****************** MODIFIERS ******************/
  /***********************************************/

  /**
   * @dev Checks if an index exists
   */
  modifier validateDistributedTokensIndex(uint256 index) {
    require(index < _distributedTokens.length(), "validateDistributedTokensIndex: index exists?");
    _;
  }

  /**
   * @dev Checks if token exists
   */
  modifier validateDistributedToken(address token) {
    require(_distributedTokens.contains(token), "validateDistributedTokens: token does not exists");
    _;
  }

  /**
   * @dev Checks if caller is the gMVDToken contract
   */
  modifier gMVDTokenOnly() {
    require(msg.sender == gMVDToken, "gMVDTokenOnly: caller should be gMVDToken");
    _;
  }

  /*******************************************/
  /****************** VIEWS ******************/
  /*******************************************/

  function cycleDurationSeconds() external view returns (uint256) {
    return _cycleDurationSeconds;
  }

  /**
   * @dev Returns the number of dividends tokens
   */
  function distributedTokensLength() external view override returns (uint256) {
    return _distributedTokens.length();
  }

  /**
   * @dev Returns dividends token address from given index
   */
  function distributedToken(uint256 index) external view override validateDistributedTokensIndex(index) returns (address){
    return address(_distributedTokens.at(index));
  }

  /**
   * @dev Returns true if given token is a dividends token
   */
  function isDistributedToken(address token) external view override returns (bool) {
    return _distributedTokens.contains(token);
  }

  /**
   * @dev Returns time at which the next cycle will start
   */
  function nextCycleStartTime() public view returns (uint256) {
    return currentCycleStartTime.add(_cycleDurationSeconds);
  }

  /**
   * @dev Returns user's dividends pending amount for a given token
   */
  function pendingDividendsAmount(address token, address userAddress) external view returns (uint256) {
    if (totalAllocation == 0) {
      return 0;
    }

    DividendsInfo storage dividendsInfo_ = dividendsInfo[token];

    uint256 accDividendsPerShare = dividendsInfo_.accDividendsPerShare;
    uint256 lastUpdateTime = dividendsInfo_.lastUpdateTime;
    uint256 dividendAmountPerSecond_ = _dividendsAmountPerSecond(token);

    // check if the current cycle has changed since last update
    if (_currentBlockTimestamp() > nextCycleStartTime()) {
      // get remaining rewards from last cycle
      accDividendsPerShare = accDividendsPerShare.add(
        (nextCycleStartTime().sub(lastUpdateTime)).mul(dividendAmountPerSecond_).mul(1e7).div(totalAllocation)
      );
      lastUpdateTime = nextCycleStartTime();
      dividendAmountPerSecond_ = dividendsInfo_.pendingAmount.mul(dividendsInfo_.cycleDividendsPercent).div(100).div(
        _cycleDurationSeconds
      );
    }

    // get pending rewards from current cycle
    accDividendsPerShare = accDividendsPerShare.add(
      (_currentBlockTimestamp().sub(lastUpdateTime)).mul(dividendAmountPerSecond_).mul(1e7).div(totalAllocation)
    );

    return usersAllocation[userAddress]
        .mul(accDividendsPerShare)
        .div(1e9)
        .sub(users[token][userAddress].rewardDebt)
        .add(users[token][userAddress].pendingDividends);
  }

  /**************************************************/
  /****************** PUBLIC FUNCTIONS **************/
  /**************************************************/

  /**
   * @dev Updates the current cycle start time if previous cycle has ended
   */
  function updateCurrentCycleStartTime() public {
    uint256 nextCycleStartTime_ = nextCycleStartTime();

    if (_currentBlockTimestamp() >= nextCycleStartTime_) {
      currentCycleStartTime = nextCycleStartTime_;
    }
  }

  /**
   * @dev Updates dividends info for a given token
   */
  function updateDividendsInfo(address token) external validateDistributedToken(token) {
    _updateDividendsInfo(token);
  }

  /****************************************************************/
  /****************** EXTERNAL PUBLIC FUNCTIONS  ******************/
  /****************************************************************/

  /**
   * @dev Updates all dividendsInfo
   */
  function massUpdateDividendsInfo() external {
    uint256 length = _distributedTokens.length();
    for (uint256 index = 0; index < length; ++index) {
      _updateDividendsInfo(_distributedTokens.at(index));
    }
  }

  /**
   * @dev Harvests caller's pending dividends of a given token
   */
  function harvestDividends(address token, bool withdrawEth) external nonReentrant {
    if (!_distributedTokens.contains(token)) {
      require(dividendsInfo[token].distributedAmount > 0, "harvestDividends: invalid token");
    }

    _harvestDividends(token, withdrawEth);
  }

  /**
   * @dev Harvests all caller's pending dividends
   */
  function harvestAllDividends(bool withdrawEth) external nonReentrant {
    uint256 length = _distributedTokens.length();
    for (uint256 index = 0; index < length; ++index) {
      _harvestDividends(_distributedTokens.at(index), withdrawEth);
    }
  }

  /**
   * @dev Transfers the given amount of token from caller to pendingAmount
   *
   * Must only be called by a trustable address
   */
  function addDividendsToPending(address token, uint256 amount) external override nonReentrant {
    uint256 prevTokenBalance = IERC20(token).balanceOf(address(this));
    DividendsInfo storage dividendsInfo_ = dividendsInfo[token];

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

    // handle tokens with transfer tax
    uint256 receivedAmount = IERC20(token).balanceOf(address(this)).sub(prevTokenBalance);
    dividendsInfo_.pendingAmount = dividendsInfo_.pendingAmount.add(receivedAmount);

    emit DividendsAddedToPending(token, receivedAmount);
  }

  /**
   * @dev Emergency withdraw token's balance on the contract
   */
  function emergencyWithdraw(IERC20 token) public nonReentrant onlyOwner {
    uint256 balance = token.balanceOf(address(this));
    require(balance > 0, "emergencyWithdraw: token balance is null");
    _safeTokenTransfer(token, msg.sender, balance);
  }

  /**
   * @dev Emergency withdraw all dividend tokens' balances on the contract
   */
  function emergencyWithdrawAll() external nonReentrant onlyOwner {
    for (uint256 index = 0; index < _distributedTokens.length(); ++index) {
      emergencyWithdraw(IERC20(_distributedTokens.at(index)));
    }
  }

  /*****************************************************************/
  /****************** OWNABLE FUNCTIONS  ******************/
  /*****************************************************************/

  /**
   * Allocates "userAddress" user's "amount" of gMVD to this dividends contract
   *
   * Can only be called by gMVDToken contract, which is trusted to verify amounts
   * "data" is only here for compatibility reasons (IGMVDTokenUsage)
   */
  function allocate(address userAddress, uint256 amount, bytes calldata /*data*/) external override nonReentrant gMVDTokenOnly {
    uint256 newUserAllocation = usersAllocation[userAddress].add(amount);
    uint256 newTotalAllocation = totalAllocation.add(amount);
    _updateUser(userAddress, newUserAllocation, newTotalAllocation);
  }

  /**
   * Deallocates "userAddress" user's "amount" of gMVD allocation from this dividends contract
   *
   * Can only be called by gMVDToken contract, which is trusted to verify amounts
   * "data" is only here for compatibility reasons (IGMVDTokenUsage)
   */
  function deallocate(address userAddress, uint256 amount, bytes calldata /*data*/) external override nonReentrant gMVDTokenOnly {
    uint256 newUserAllocation = usersAllocation[userAddress].sub(amount);
    uint256 newTotalAllocation = totalAllocation.sub(amount);
    _updateUser(userAddress, newUserAllocation, newTotalAllocation);
  }

  /**
   * @dev Enables a given token to be distributed as dividends
   *
   * Effective from the next cycle
   */
  function enableDistributedToken(address token) external onlyOwner {
    DividendsInfo storage dividendsInfo_ = dividendsInfo[token];
    require(
      dividendsInfo_.lastUpdateTime == 0 || dividendsInfo_.distributionDisabled,
      "enableDistributedToken: Already enabled dividends token"
    );
    require(_distributedTokens.length() < MAX_DISTRIBUTED_TOKENS, "enableDistributedToken: too many distributedTokens");
    // initialize lastUpdateTime if never set before
    if (dividendsInfo_.lastUpdateTime == 0) {
      dividendsInfo_.lastUpdateTime = _currentBlockTimestamp();
    }
    // initialize cycleDividendsPercent to the minimum if never set before
    if (dividendsInfo_.cycleDividendsPercent == 0) {
      dividendsInfo_.cycleDividendsPercent = DEFAULT_CYCLE_DIVIDENDS_PERCENT;
    }
    dividendsInfo_.distributionDisabled = false;
    _distributedTokens.add(token);
    emit DistributedTokenEnabled(token);
  }

  /**
   * @dev Disables distribution of a given token as dividends
   *
   * Effective from the next cycle
   */
  function disableDistributedToken(address token) external onlyOwner {
    DividendsInfo storage dividendsInfo_ = dividendsInfo[token];
    require(
      dividendsInfo_.lastUpdateTime > 0 && !dividendsInfo_.distributionDisabled,
      "disableDistributedToken: Already disabled dividends token"
    );
    dividendsInfo_.distributionDisabled = true;
    emit DistributedTokenDisabled(token);
  }

  /**
   * @dev Updates the percentage of pending dividends that will be distributed during the next cycle
   *
   * Must be a value between MIN_CYCLE_DIVIDENDS_PERCENT and MAX_CYCLE_DIVIDENDS_PERCENT
   */
  function updateCycleDividendsPercent(address token, uint256 percent) external onlyOwner {
    require(percent <= MAX_CYCLE_DIVIDENDS_PERCENT, "updateCycleDividendsPercent: percent mustn't exceed maximum");
    require(percent >= MIN_CYCLE_DIVIDENDS_PERCENT, "updateCycleDividendsPercent: percent mustn't exceed minimum");
    DividendsInfo storage dividendsInfo_ = dividendsInfo[token];
    uint256 previousPercent = dividendsInfo_.cycleDividendsPercent;
    dividendsInfo_.cycleDividendsPercent = percent;
    emit CycleDividendsPercentUpdated(token, previousPercent, dividendsInfo_.cycleDividendsPercent);
  }

  /**
  * @dev remove an address from _distributedTokens
  *
  * Can only be valid for a disabled dividends token and if the distribution has ended
  */
  function removeTokenFromDistributedTokens(address tokenToRemove) external onlyOwner {
    DividendsInfo storage _dividendsInfo = dividendsInfo[tokenToRemove];
    require(_dividendsInfo.distributionDisabled && _dividendsInfo.currentDistributionAmount == 0, "removeTokenFromDistributedTokens: cannot be removed");
    _distributedTokens.remove(tokenToRemove);
    emit DistributedTokenRemoved(tokenToRemove);
  }

  function updateCycleDurationSeconds(uint256 cycleDurationSeconds_) external onlyOwner {
    require(cycleDurationSeconds_ >= 7 days, "Dividends: Min cycle duration");
    require(cycleDurationSeconds_ <= 60 days, "Dividends: Max cycle duration");
    _cycleDurationSeconds = cycleDurationSeconds_;
  }

  /********************************************************/
  /****************** INTERNAL FUNCTIONS ******************/
  /********************************************************/

  /**
   * @dev Returns the amount of dividends token distributed every second (times 1e2)
   */
  function _dividendsAmountPerSecond(address token) internal view returns (uint256) {
    if (!_distributedTokens.contains(token)) return 0;
    return dividendsInfo[token].currentDistributionAmount.mul(1e2).div(_cycleDurationSeconds);
  }

  /**
   * @dev Updates every user's rewards allocation for each distributed token
   */
  function _updateDividendsInfo(address token) internal {
    uint256 currentBlockTimestamp = _currentBlockTimestamp();
    DividendsInfo storage dividendsInfo_ = dividendsInfo[token];

    updateCurrentCycleStartTime();

    uint256 lastUpdateTime = dividendsInfo_.lastUpdateTime;
    uint256 accDividendsPerShare = dividendsInfo_.accDividendsPerShare;
    if (currentBlockTimestamp <= lastUpdateTime) {
      return;
    }

    // if no gMVD is allocated or initial distribution has not started yet
    if (totalAllocation == 0 || currentBlockTimestamp < currentCycleStartTime) {
      dividendsInfo_.lastUpdateTime = currentBlockTimestamp;
      return;
    }

    uint256 currentDistributionAmount = dividendsInfo_.currentDistributionAmount; // gas saving
    uint256 currentCycleDistributedAmount = dividendsInfo_.currentCycleDistributedAmount; // gas saving

    // check if the current cycle has changed since last update
    if (lastUpdateTime < currentCycleStartTime) {
      // update accDividendPerShare for the end of the previous cycle
      accDividendsPerShare = accDividendsPerShare.add(
        (currentDistributionAmount.mul(1e2).sub(currentCycleDistributedAmount))
          .mul(1e7)
          .div(totalAllocation)
      );

      // check if distribution is enabled
      if (!dividendsInfo_.distributionDisabled) {
        // transfer the token's cycleDividendsPercent part from the pending slot to the distribution slot
        dividendsInfo_.distributedAmount = dividendsInfo_.distributedAmount.add(currentDistributionAmount);

        uint256 pendingAmount = dividendsInfo_.pendingAmount;
        currentDistributionAmount = pendingAmount.mul(dividendsInfo_.cycleDividendsPercent).div(
          10000
        );
        dividendsInfo_.currentDistributionAmount = currentDistributionAmount;
        dividendsInfo_.pendingAmount = pendingAmount.sub(currentDistributionAmount);
      } else {
        // stop the token's distribution on next cycle
        dividendsInfo_.distributedAmount = dividendsInfo_.distributedAmount.add(currentDistributionAmount);
        currentDistributionAmount = 0;
        dividendsInfo_.currentDistributionAmount = 0;
      }

      currentCycleDistributedAmount = 0;
      lastUpdateTime = currentCycleStartTime;
    }

    uint256 toDistribute = (currentBlockTimestamp.sub(lastUpdateTime)).mul(_dividendsAmountPerSecond(token));
    // ensure that we can't distribute more than currentDistributionAmount (for instance w/ a > 24h service interruption)
    if (currentCycleDistributedAmount.add(toDistribute) > currentDistributionAmount.mul(1e2)) {
      toDistribute = currentDistributionAmount.mul(1e2).sub(currentCycleDistributedAmount);
    }

    dividendsInfo_.currentCycleDistributedAmount = currentCycleDistributedAmount.add(toDistribute);
    dividendsInfo_.accDividendsPerShare = accDividendsPerShare.add(toDistribute.mul(1e7).div(totalAllocation));
    dividendsInfo_.lastUpdateTime = currentBlockTimestamp;
  }

  /**
   * Updates "userAddress" user's and total allocations for each distributed token
   */
  function _updateUser(address userAddress, uint256 newUserAllocation, uint256 newTotalAllocation) internal {
    uint256 previousUserAllocation = usersAllocation[userAddress];

    // for each distributedToken
    uint256 length = _distributedTokens.length();
    for (uint256 index = 0; index < length; ++index) {
      address token = _distributedTokens.at(index);
      _updateDividendsInfo(token);

      UserInfo storage user = users[token][userAddress];
      uint256 accDividendsPerShare = dividendsInfo[token].accDividendsPerShare;

      uint256 pending = previousUserAllocation.mul(accDividendsPerShare).div(1e9).sub(user.rewardDebt);
      user.pendingDividends = user.pendingDividends.add(pending);
      user.rewardDebt = newUserAllocation.mul(accDividendsPerShare).div(1e9);
    }

    usersAllocation[userAddress] = newUserAllocation;
    totalAllocation = newTotalAllocation;

    emit UserUpdated(userAddress, previousUserAllocation, newUserAllocation);
  }

  /**
   * @dev Harvests msg.sender's pending dividends of a given token
   */
  function _harvestDividends(address token, bool withdrawEth) internal {
    _updateDividendsInfo(token);

    UserInfo storage user = users[token][msg.sender];
    uint256 accDividendsPerShare = dividendsInfo[token].accDividendsPerShare;

    uint256 userGMVDAllocation = usersAllocation[msg.sender];
    uint256 pending = user.pendingDividends.add(
      userGMVDAllocation.mul(accDividendsPerShare).div(1e9).sub(user.rewardDebt)
    );

    user.pendingDividends = 0;
    user.rewardDebt = userGMVDAllocation.mul(accDividendsPerShare).div(1e9);

    if(withdrawEth && token == weth ){
      _transferOutETH(pending, payable(msg.sender));
    } else {
      _safeTokenTransfer(IERC20(token), msg.sender, pending);
    }
    emit DividendsCollected(msg.sender, token, pending);
  }

  function _transferOutETH(uint256 _amountOut, address payable _receiver) internal {
    IWETH _weth = IWETH(weth);
    _weth.withdraw(_amountOut);

    (bool success, /* bytes memory data */) = _receiver.call{ value: _amountOut }("");

    if (success) { return; }

    // if the transfer failed, re-wrap the token and send it to the receiver
    _weth.deposit{ value: _amountOut }();
    _weth.transfer(address(_receiver), _amountOut);
  }

  receive() external payable {
      require(msg.sender == weth, "Dividends: invalid sender");
  }

  /**
   * @dev Safe token transfer function, in case rounding error causes pool to not have enough tokens
   */
  function _safeTokenTransfer(
    IERC20 token,
    address to,
    uint256 amount
  ) internal {
    if (amount > 0) {
      uint256 tokenBal = token.balanceOf(address(this));
      if (amount > tokenBal) {
        token.safeTransfer(to, tokenBal);
      } else {
        token.safeTransfer(to, amount);
      }
    }
  }

  /**
   * @dev Utility function to get the current block timestamp
   */
  function _currentBlockTimestamp() internal view virtual returns (uint256) {
    /* solhint-disable not-rely-on-time */
    return block.timestamp;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.5;

interface IDividends {
  function distributedTokensLength() external view returns (uint256);

  function distributedToken(uint256 index) external view returns (address);

  function isDistributedToken(address token) external view returns (bool);

  function addDividendsToPending(address token, uint256 amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.5;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.5;

interface IGMVDTokenUsage {
    function allocate(address userAddress, uint256 amount, bytes calldata data) external;
    function deallocate(address userAddress, uint256 amount, bytes calldata data) external;
}

//SPDX-License-Identifier: MIT

pragma solidity ^0.7.5;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.5;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.5;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.5;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.5;

import "./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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.5;

/**
 * @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 make 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

pragma solidity ^0.7.5;

import "../interfaces/IERC20.sol";
import "./SafeMath.sol";
import "./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 SafeMath for uint256;
    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'
        // solhint-disable-next-line max-line-length
        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).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _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
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.5;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
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) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        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) {
        // 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) {
        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) {
        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) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @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. 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) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b > 0, "SafeMath: modulo by zero");
        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) {
        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.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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) {
        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) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

{
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"gMVDToken_","type":"address"},{"internalType":"uint256","name":"startTime_","type":"uint256"},{"internalType":"address","name":"weth_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"previousValue","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newValue","type":"uint256"}],"name":"CycleDividendsPercentUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"}],"name":"DistributedTokenDisabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"}],"name":"DistributedTokenEnabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"}],"name":"DistributedTokenRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"DividendsAddedToPending","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"DividendsCollected","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"previousBalance","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newBalance","type":"uint256"}],"name":"UserUpdated","type":"event"},{"inputs":[],"name":"DEFAULT_CYCLE_DIVIDENDS_PERCENT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_CYCLE_DIVIDENDS_PERCENT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_DISTRIBUTED_TOKENS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MIN_CYCLE_DIVIDENDS_PERCENT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"addDividendsToPending","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"allocate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"currentCycleStartTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"cycleDurationSeconds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"deallocate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"disableDistributedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"distributedToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"distributedTokensLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"dividendsInfo","outputs":[{"internalType":"uint256","name":"currentDistributionAmount","type":"uint256"},{"internalType":"uint256","name":"currentCycleDistributedAmount","type":"uint256"},{"internalType":"uint256","name":"pendingAmount","type":"uint256"},{"internalType":"uint256","name":"distributedAmount","type":"uint256"},{"internalType":"uint256","name":"accDividendsPerShare","type":"uint256"},{"internalType":"uint256","name":"lastUpdateTime","type":"uint256"},{"internalType":"uint256","name":"cycleDividendsPercent","type":"uint256"},{"internalType":"bool","name":"distributionDisabled","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"emergencyWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"emergencyWithdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"enableDistributedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"gMVDToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"withdrawEth","type":"bool"}],"name":"harvestAllDividends","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"bool","name":"withdrawEth","type":"bool"}],"name":"harvestDividends","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"isDistributedToken","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"massUpdateDividendsInfo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"nextCycleStartTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"userAddress","type":"address"}],"name":"pendingDividendsAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenToRemove","type":"address"}],"name":"removeTokenFromDistributedTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalAllocation","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"updateCurrentCycleStartTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"percent","type":"uint256"}],"name":"updateCycleDividendsPercent","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"cycleDurationSeconds_","type":"uint256"}],"name":"updateCycleDurationSeconds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"updateDividendsInfo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"users","outputs":[{"internalType":"uint256","name":"pendingDividends","type":"uint256"},{"internalType":"uint256","name":"rewardDebt","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"usersAllocation","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"weth","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000fa69292726a53d62111c9485c03ac551ba05679b000000000000000000000000000000000000000000000000000000006433518000000000000000000000000082af49447d8a07e3bd95bd0d56f35241523fbab1

-----Decoded View---------------
Arg [0] : gMVDToken_ (address): 0xFA69292726A53d62111c9485C03ac551Ba05679b
Arg [1] : startTime_ (uint256): 1681084800
Arg [2] : weth_ (address): 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000fa69292726a53d62111c9485c03ac551ba05679b
Arg [1] : 0000000000000000000000000000000000000000000000000000000064335180
Arg [2] : 00000000000000000000000082af49447d8a07e3bd95bd0d56f35241523fbab1