// 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 (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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


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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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


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

pragma solidity ^0.8.0;

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

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

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


// SPDX-License-Identifier: MIT
pragma solidity =0.8.18;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

contract MemeVault is Initializable, OwnableUpgradeable, PausableUpgradeable,  ReentrancyGuardUpgradeable {
  using SafeERC20 for IERC20;

  // The precision factor
  uint256 public constant PRECISION_FACTOR = 1e12;

  // Accrued token per share
  uint256 public accTokenPerShare;

  // The end timestamp when reward distribution ends
  uint256 public endTime;

  // The start timestamp when reward distribution starts
  uint256 public startTime;

  // The timestamp of the last pool update
  uint256 public lastRewardTime;

  // The pool limit (0 if none)
  uint256 public poolLimitPerUser;

  uint256 public rewardsPerSecond;

  // The reward token
  IERC20 public rewardToken;

  // The staked token
  IERC20 public stakedToken;

  // Info of each user that stakes tokens (stakedToken)
  mapping(address => UserInfo) public userInfo;

  struct UserInfo {
    uint256 amount; // How many staked tokens the user has provided
    uint256 rewardDebt; // Reward debt
    uint256 claimTotal; // total rewards already claimed
  }

  event AdminTokenRecovery(address tokenRecovered, uint256 amount);
  event Deposit(address indexed user, uint256 amount);
  event EmergencyWithdraw(address indexed user, uint256 amount);
  event EmergencyRewardWithdraw(address indexed user, uint256 amount);
  event NewStartAndEndTime(uint256 startTime, uint256 endTime);
  event NewRewardsPerSecond(uint256 rewardsPerSecond);
  event NewPoolLimit(uint256 poolLimitPerUser);
  event Withdraw(address indexed user, uint256 amount);
  event Harvest(address indexed user, uint256 pendingRewards);

  /*
   * @notice Initialize the contract
   * @param _stakedToken: staked token address
   * @param _rewardToken: reward token address
   * @param _rewardsPerSecond: rewards per second (in rewardToken)
   * @param _startTime: start timestamp in seconds
   * @param _endTime: end timestamp in seconds
   * @param _poolLimitPerUser: pool limit per user in stakedToken (if any, else 0)
   */

  function initialize(
    IERC20 _stakedToken,
    IERC20 _rewardToken,
    uint256 _rewardsPerSecond,
    uint256 _startTime,
    uint256 _endTime,
    uint256 _poolLimitPerUser
  ) initializer public {
    stakedToken = _stakedToken;
    rewardToken = _rewardToken;
    rewardsPerSecond = _rewardsPerSecond;
    startTime = _startTime;
    endTime = _endTime;
    poolLimitPerUser = _poolLimitPerUser;
    // Set the lastRewardTime as the startTime
    lastRewardTime = startTime;
    __Ownable_init();
    __Pausable_init();
    __ReentrancyGuard_init();
  }

  /*
   * @notice Deposit staked tokens and collect reward tokens (if any)
   * @param _amount: amount to withdraw (in rewardToken)
   */
  function deposit(uint256 _amount) external whenNotPaused nonReentrant {
    UserInfo storage user = userInfo[msg.sender];
    if (poolLimitPerUser > 0) {
      require((_amount + user.amount) <= poolLimitPerUser, "User amount above limit");
    }
    _updatePool();
    _harvestPendingRewards(msg.sender);

    if (_amount > 0) {
      user.amount += _amount;
      stakedToken.safeTransferFrom(msg.sender, address(this), _amount);
    }
    user.rewardDebt = (user.amount * accTokenPerShare) / PRECISION_FACTOR;
    emit Deposit(msg.sender, _amount);
  }

  /*
   * @notice Withdraw staked tokens and collect reward tokens
   * @param _amount: amount to withdraw (in rewardToken)
   */
  function withdraw(uint256 _amount) external whenNotPaused nonReentrant {
    UserInfo storage user = userInfo[msg.sender];
    require(user.amount >= _amount, "Amount to withdraw too high");

    _updatePool();
    _harvestPendingRewards(msg.sender);

    if (_amount > 0) {
      user.amount -= _amount;
      stakedToken.safeTransfer(msg.sender, _amount);
    }
    user.rewardDebt = (user.amount * accTokenPerShare) / PRECISION_FACTOR;
    emit Withdraw(msg.sender, _amount);
  }

  function _harvestPendingRewards(address _user) internal {
    UserInfo storage user = userInfo[_user];
    if (user.amount > 0) {
      uint256 pending = (user.amount * accTokenPerShare/PRECISION_FACTOR) - user.rewardDebt;
      if (pending > 0) {
        rewardToken.safeTransfer(_user, pending);
        user.claimTotal += pending;
      }
      emit Harvest(_user, pending);
    }
  }

  /*
   * @notice Withdraw staked tokens without caring about rewards rewards
   * @dev Needs to be for emergency.
   */
  function emergencyWithdraw() external nonReentrant {
    UserInfo storage user = userInfo[msg.sender];
    uint256 amountToTransfer = user.amount;
    if (amountToTransfer > 0) {
      user.amount = 0;
      user.rewardDebt = 0;
      stakedToken.safeTransfer(msg.sender, amountToTransfer);
    }
    emit EmergencyWithdraw(msg.sender, amountToTransfer);
  }

  /*
   * @notice withdraw reward tokens
   * @dev Only callable by owner. Needs to be for emergency.
   */
  function emergencyRewardWithdraw(uint256 _amount) external onlyOwner {
    rewardToken.safeTransfer(msg.sender, _amount);
    emit EmergencyRewardWithdraw(msg.sender, _amount);
  }

  /**
   * @notice It allows the admin to recover wrong tokens sent to the contract
   * @param _tokenAddress: the address of the token to withdraw
   * @dev This function is only callable by admin.
   */
  function recoverWrongTokens(address _tokenAddress) external onlyOwner {
    require(_tokenAddress != address(stakedToken) && _tokenAddress != address(rewardToken), "existing token address");
    uint256 balance = IERC20(_tokenAddress).balanceOf(address(this));
    IERC20(_tokenAddress).safeTransfer(msg.sender, balance);
    emit AdminTokenRecovery(_tokenAddress, balance);
  }

  /*
   * @notice Stop rewards
   * @dev Only callable by owner
   */
  function stopReward() external onlyOwner {
    endTime = block.timestamp;
  }

  /*
   * @notice Update pool limit per user
   * @dev Only callable by owner.
   * @param _poolLimitPerUser: new pool limit per user
   */
  function updatePoolLimitPerUser(uint256 _poolLimitPerUser) external onlyOwner {
    require(_poolLimitPerUser > poolLimitPerUser, "New limit must be higher");
    poolLimitPerUser = _poolLimitPerUser;
    emit NewPoolLimit(poolLimitPerUser);
  }

  /*
   * @notice Update reward per second
   * @dev Only callable by owner.
   * @param _rewardsPerSecond: the rewards per second
   */
  function updateRewardsPerSecond(uint256 _rewardsPerSecond) external onlyOwner {
    require(block.timestamp < startTime, "Pool has started");
    rewardsPerSecond = _rewardsPerSecond;
    emit NewRewardsPerSecond(_rewardsPerSecond);
  }

  /**
   * @notice It allows the admin to update start and end timestamps
   * @dev This function is only callable by owner.
   * @param _startTime: the new start timestamp
   * @param _endTime: the new end timestamp
   */
  function updateStartAndEndTime(uint256 _startTime, uint256 _endTime) external onlyOwner {
    require(block.timestamp < startTime, "Pool has started");
    require(_startTime < _endTime, "startTime > endTime");
    require(block.timestamp < _startTime, "startTime must be higher than block timestamp");

    startTime = _startTime;
    endTime = _endTime;
    // Set the lastRewardTime as the startTime
    lastRewardTime = _startTime;
    emit NewStartAndEndTime(_startTime, _endTime);
  }

  /*
   * @notice View function to see pending reward on frontend.
   * @param _user: user address
   * @return Pending reward for a given user
   */
  function pendingReward(address _user) external view returns (uint256 pending) {
    UserInfo memory user = userInfo[_user];
    uint256 stakedTokenSupply = stakedToken.balanceOf(address(this));
    if (block.timestamp > startTime && stakedTokenSupply > 0) {
      uint256 multiplier = _getMultiplier(lastRewardTime, block.timestamp);
      uint256 harvest = multiplier * rewardsPerSecond;
      uint256 adjustedTokenPerShare = accTokenPerShare + (harvest * PRECISION_FACTOR / stakedTokenSupply);
      pending = (user.amount * adjustedTokenPerShare / PRECISION_FACTOR) - user.rewardDebt;
    }
  }

  /*
   * @notice Update reward variables of the given pool to be up-to-date.
   */
  function _updatePool() internal {
    if (block.timestamp <= lastRewardTime) {
      return;
    }
    uint256 stakedTokenSupply = stakedToken.balanceOf(address(this));
    if (stakedTokenSupply > 0) {
      uint256 multiplier = _getMultiplier(lastRewardTime, block.timestamp);
      accTokenPerShare += (multiplier * rewardsPerSecond * PRECISION_FACTOR / stakedTokenSupply);
    }
    lastRewardTime = block.timestamp;
  }

  /*
   * @notice Return reward multiplier over the given _from to _to timestamo.
   * @param _from: start timestamp
   * @param _to: finish timestamp
   */
  function _getMultiplier(uint256 from, uint256 to) internal view returns (uint256) {
    if (to <= endTime) {
      return to - from;
    } else if (from >= endTime) {
      return 0;
    } else {
      return endTime - from;
    }
  }

  function pause() external onlyOwner {
    _pause();
  }

  function unpause() external onlyOwner {
    _unpause();
  }

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (proxy/Clones.sol)

pragma solidity ^0.8.0;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
 * deploying minimal proxy contracts, also known as "clones".
 *
 * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
 * > a minimal bytecode implementation that delegates all calls to a known, fixed address.
 *
 * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
 * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
 * deterministic method.
 *
 * _Available since v3.4._
 */
library Clones {
    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create opcode, which should never revert.
     */
    function clone(address implementation) internal returns (address instance) {
        /// @solidity memory-safe-assembly
        assembly {
            // Cleans the upper 96 bits of the `implementation` word, then packs the first 3 bytes
            // of the `implementation` address with the bytecode before the address.
            mstore(0x00, or(shr(0xe8, shl(0x60, implementation)), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000))
            // Packs the remaining 17 bytes of `implementation` with the bytecode after the address.
            mstore(0x20, or(shl(0x78, implementation), 0x5af43d82803e903d91602b57fd5bf3))
            instance := create(0, 0x09, 0x37)
        }
        require(instance != address(0), "ERC1167: create failed");
    }

    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create2 opcode and a `salt` to deterministically deploy
     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
     * the clones cannot be deployed twice at the same address.
     */
    function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
        /// @solidity memory-safe-assembly
        assembly {
            // Cleans the upper 96 bits of the `implementation` word, then packs the first 3 bytes
            // of the `implementation` address with the bytecode before the address.
            mstore(0x00, or(shr(0xe8, shl(0x60, implementation)), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000))
            // Packs the remaining 17 bytes of `implementation` with the bytecode after the address.
            mstore(0x20, or(shl(0x78, implementation), 0x5af43d82803e903d91602b57fd5bf3))
            instance := create2(0, 0x09, 0x37, salt)
        }
        require(instance != address(0), "ERC1167: create2 failed");
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt,
        address deployer
    ) internal pure returns (address predicted) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(add(ptr, 0x38), deployer)
            mstore(add(ptr, 0x24), 0x5af43d82803e903d91602b57fd5bf3ff)
            mstore(add(ptr, 0x14), implementation)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73)
            mstore(add(ptr, 0x58), salt)
            mstore(add(ptr, 0x78), keccak256(add(ptr, 0x0c), 0x37))
            predicted := keccak256(add(ptr, 0x43), 0x55)
        }
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(address implementation, bytes32 salt)
        internal
        view
        returns (address predicted)
    {
        return predictDeterministicAddress(implementation, salt, address(this));
    }
}


// SPDX-License-Identifier: MIT
pragma solidity =0.8.18;
import { IERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

  interface  IMemeVault {
    function initialize(
      IERC20 _stakedToken,
      IERC20 _rewardToken,
      uint256 _rewardsPerSecond,
      uint256 _startTime,
      uint256 _endTime,
      uint256 _poolLimitPerUser
    ) external;
  }

// SPDX-License-Identifier: MIT
pragma solidity =0.8.18;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/proxy/Clones.sol";
import "./IMemeVault.sol";

contract MemeVaultFactory is Ownable {
  event NewMemeVaultContract(address indexed memeVaultClone, address indexed deployer);
  event SetImplAddress(address indexed vaultImplAddress);
  address public  vaultImplAddress;
  // Address of each pool.
  address[] public memeVaults;

  constructor(address _vaultImplAddress) {
    vaultImplAddress = _vaultImplAddress;
  }

  function setImplAddress(address _vaultImplAddress) external onlyOwner {
    vaultImplAddress = _vaultImplAddress;
    emit SetImplAddress(_vaultImplAddress);
  }

  /*
   * @notice Deploy the pool
   * @param _stakedToken: staked token address
   * @param _rewardToken: reward token address
   * @param _rewardsPerSecond: rewards per second (in rewardToken)
   * @param _startTime: start timestamp in seconds
   * @param _endTime: end timestamp in seconds
   * @param _poolLimitPerUser: pool limit per user in stakedToken (if any, else 0)
   * @param _admin: admin address with ownership
   * @return address of new smart chef contract
   */
  function deployVault(
    IERC20 _stakedToken,
    IERC20 _rewardToken,
    uint256 _rewardsPerSecond,
    uint256 _startTime,
    uint256 _endTime,
    uint256 _poolLimitPerUser
  ) external onlyOwner {
    require(_stakedToken.totalSupply() >= 0);
    require(_rewardToken.totalSupply() >= 0);
    require(_stakedToken != _rewardToken, "Tokens must be be different");

    address memeVaultClone = Clones.clone(vaultImplAddress);

    IMemeVault(memeVaultClone).initialize(
      _stakedToken,
      _rewardToken,
      _rewardsPerSecond,
      _startTime,
      _endTime,
      _poolLimitPerUser
    );
    Ownable(memeVaultClone).transferOwnership(owner());
    memeVaults.push(memeVaultClone);
    emit NewMemeVaultContract(memeVaultClone, msg.sender);
  }

  function memeVaultsLength() external view returns (uint256) {
    return memeVaults.length;
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 (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;
    }
}


Txn Hash	Method	Block	Time / Age	From		To	Value	Txn Fee	Txn Type
0x8ba340a79aae3aba683a98d32b7a98fdc6856c8efde5ed3ad797662c241ada68	Transfer Ownership	12829281		CorgiAI: Deployer	IN	0x01a732...6d4b1aca	0 CRO	0.288905461 CRO	EIP-1559
0x6ec1635311b11284f05ab373b2200c372cd16d25d724aabffed41030eda32ba6	0x57f98f17	9199408		CorgiAI: Deployer	IN	0x01a732...6d4b1aca	0 CRO	11.7729190481525 CRO	EIP-1559
0x334fba241a004728334b8b2aa479a61727125bd78bc334806d5462f9ee6d4da4	0x57f98f17	9199382		CorgiAI: Deployer	IN	0x01a732...6d4b1aca	0 CRO	11.77667163449 CRO	EIP-1559
0x9525d029ccf68cdc7aad409d11a5f979ff3cb75eae21b67eaced613347e18738	0x60806040	9199198		CorgiAI: Deployer	IN	0x01a732...6d4b1aca	0 CRO	2.553544954615654 CRO	EIP-1559

Address0x01a732a77a517ae02d160bbaf8e3fcd26d4b1aca

Address
0x01a732a77a517ae02d160bbaf8e3fcd26d4b1aca