creation_sourcecode: {{
    "language": "Solidity",
    "sources": {
      "@openzeppelin/contracts/access/Ownable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"../utils/Context.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    constructor() {\n        _setOwner(_msgSender());\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view virtual returns (address) {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() {\n        require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n        _;\n    }\n\n    /**\n     * @dev Leaves the contract without owner. It will not be possible to call\n     * `onlyOwner` functions anymore. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby removing any functionality that is only available to the owner.\n     */\n    function renounceOwnership() public virtual onlyOwner {\n        _setOwner(address(0));\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership(address newOwner) public virtual onlyOwner {\n        require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n        _setOwner(newOwner);\n    }\n\n    function _setOwner(address newOwner) private {\n        address oldOwner = _owner;\n        _owner = newOwner;\n        emit OwnershipTransferred(oldOwner, newOwner);\n    }\n}\n"
      },
      "@openzeppelin/contracts/security/ReentrancyGuard.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n    // Booleans are more expensive than uint256 or any type that takes up a full\n    // word because each write operation emits an extra SLOAD to first read the\n    // slot's contents, replace the bits taken up by the boolean, and then write\n    // back. This is the compiler's defense against contract upgrades and\n    // pointer aliasing, and it cannot be disabled.\n\n    // The values being non-zero value makes deployment a bit more expensive,\n    // but in exchange the refund on every call to nonReentrant will be lower in\n    // amount. Since refunds are capped to a percentage of the total\n    // transaction's gas, it is best to keep them low in cases like this one, to\n    // increase the likelihood of the full refund coming into effect.\n    uint256 private constant _NOT_ENTERED = 1;\n    uint256 private constant _ENTERED = 2;\n\n    uint256 private _status;\n\n    constructor() {\n        _status = _NOT_ENTERED;\n    }\n\n    /**\n     * @dev Prevents a contract from calling itself, directly or indirectly.\n     * Calling a `nonReentrant` function from another `nonReentrant`\n     * function is not supported. It is possible to prevent this from happening\n     * by making the `nonReentrant` function external, and make it call a\n     * `private` function that does the actual work.\n     */\n    modifier nonReentrant() {\n        // On the first call to nonReentrant, _notEntered will be true\n        require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n        // Any calls to nonReentrant after this point will fail\n        _status = _ENTERED;\n\n        _;\n\n        // By storing the original value once again, a refund is triggered (see\n        // https://eips.ethereum.org/EIPS/eip-2200)\n        _status = _NOT_ENTERED;\n    }\n}\n"
      },
      "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender's allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\n     * allowance mechanism. `amount` is then deducted from the caller's\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(\n        address sender,\n        address recipient,\n        uint256 amount\n    ) external returns (bool);\n\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"
      },
      "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"../IERC20.sol\";\nimport \"../../../utils/Address.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n    using Address for address;\n\n    function safeTransfer(\n        IERC20 token,\n        address to,\n        uint256 value\n    ) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n    }\n\n    function safeTransferFrom(\n        IERC20 token,\n        address from,\n        address to,\n        uint256 value\n    ) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n    }\n\n    /**\n     * @dev Deprecated. This function has issues similar to the ones found in\n     * {IERC20-approve}, and its usage is discouraged.\n     *\n     * Whenever possible, use {safeIncreaseAllowance} and\n     * {safeDecreaseAllowance} instead.\n     */\n    function safeApprove(\n        IERC20 token,\n        address spender,\n        uint256 value\n    ) internal {\n        // safeApprove should only be called when setting an initial allowance,\n        // or when resetting it to zero. To increase and decrease it, use\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\n        require(\n            (value == 0) || (token.allowance(address(this), spender) == 0),\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\n        );\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n    }\n\n    function safeIncreaseAllowance(\n        IERC20 token,\n        address spender,\n        uint256 value\n    ) internal {\n        uint256 newAllowance = token.allowance(address(this), spender) + value;\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n    }\n\n    function safeDecreaseAllowance(\n        IERC20 token,\n        address spender,\n        uint256 value\n    ) internal {\n        unchecked {\n            uint256 oldAllowance = token.allowance(address(this), spender);\n            require(oldAllowance >= value, \"SafeERC20: decreased allowance below zero\");\n            uint256 newAllowance = oldAllowance - value;\n            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n        }\n    }\n\n    /**\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\n     * @param token The token targeted by the call.\n     * @param data The call data (encoded using abi.encode or one of its variants).\n     */\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\n        // the target address contains contract code and also asserts for success in the low-level call.\n\n        bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\n        if (returndata.length > 0) {\n            // Return data is optional\n            require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n        }\n    }\n}\n"
      },
      "@openzeppelin/contracts/utils/Address.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize, which returns 0 for contracts in\n        // construction, since the code is only stored at the end of the\n        // constructor execution.\n\n        uint256 size;\n        assembly {\n            size := extcodesize(account)\n        }\n        return size > 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n        (bool success, ) = recipient.call{value: amount}(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain `call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionCall(target, data, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value\n    ) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require(address(this).balance >= value, \"Address: insufficient balance for call\");\n        require(isContract(target), \"Address: call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.call{value: value}(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal view returns (bytes memory) {\n        require(isContract(target), \"Address: static call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.staticcall(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require(isContract(target), \"Address: delegate call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.delegatecall(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the\n     * revert reason using the provided one.\n     *\n     * _Available since v4.3._\n     */\n    function verifyCallResult(\n        bool success,\n        bytes memory returndata,\n        string memory errorMessage\n    ) internal pure returns (bytes memory) {\n        if (success) {\n            return returndata;\n        } else {\n            // Look for revert reason and bubble it up if present\n            if (returndata.length > 0) {\n                // The easiest way to bubble the revert reason is using memory via assembly\n\n                assembly {\n                    let returndata_size := mload(returndata)\n                    revert(add(32, returndata), returndata_size)\n                }\n            } else {\n                revert(errorMessage);\n            }\n        }\n    }\n}\n"
      },
      "@openzeppelin/contracts/utils/Context.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes calldata) {\n        return msg.data;\n    }\n}\n"
      },
      "src/active/stakingpool/StakingPoolV3Flat.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity 0.8.4;\n\nimport \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\nimport \"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\";\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\nimport \"@openzeppelin/contracts/security/ReentrancyGuard.sol\";\n\n// StakingPoolV3\n// - Fixed total, reward per second\n// - Dynamic APY based on pool size\n// - Multiple deposit packages with separate locking time\ncontract StakingPoolV3Flat is Ownable, ReentrancyGuard {\n  using SafeERC20 for IERC20;\n\n  struct UserInfo {\n    bool isAdded;\n    address addr;\n    uint256 totalAmount;\n    uint256 nextDepositId;\n  }\n\n  struct DepositInfo {\n    uint256 amount;\n    uint256 lockFrom;\n    uint256 lockTo;\n    uint256 rewardDebt;\n    uint256 rewardPending;\n  }\n\n  // The precision factor. Should be 1e12 to avoid overflow.\n  uint256 private constant _PRECISION_FACTOR = 1e12;\n\n  IERC20 public rewardToken;\n  IERC20 public stakedToken;\n\n  // Info of each user that stakes tokens (stakedToken)\n  mapping(address => UserInfo) public userInfos;\n  // User list\n  address[] public userList;\n\n  // depositInfos[user][depositId] = DepositInfo\n  mapping(address => mapping(uint256 => DepositInfo)) public depositInfos;\n\n  // Reward tokens created per second.\n  uint256 public rewardPerSecond;\n  // The time when Pool mining starts.\n  uint256 public startTime;\n  // The time when Pool mining ends.\n  uint256 public endTime;\n\n  // The time of the last pool update\n  uint256 public lastRewardTime;\n  // Accumulated token per share\n  uint256 public accTokenPerShare;\n\n  // Total staking tokens\n  uint256 public totalStakingTokens;\n  // Total reward tokens\n  uint256 public totalRewardTokens;\n\n  // Freeze start time\n  uint256 public freezeStartTime;\n  // Freeze end time\n  uint256 public freezeEndTime;\n\n  // The pool limit (0 if none)\n  uint256 public poolLimitPerUser;\n  // Minimum deposit amount\n  uint256 public minDepositAmount;\n\n  // The locking duration for each deposit package\n  uint256 public lockDuration;\n\n  // delegators[staker][delegate] = status\n  mapping(address => mapping(address => bool)) public delegators;\n\n  event EDeposit(address indexed user, uint256 amount, uint256 depositId);\n  event EWithdraw(address indexed user, uint256 amount, uint256 depositId);\n  event EAddRewardTokens(address indexed user, uint256 amount);\n\n  constructor(\n    IERC20 _stakedToken,\n    IERC20 _rewardToken,\n    uint256 _rewardPerSecond,\n    uint256 _startTime,\n    uint256 _endTime,\n    uint256 _lockDuration\n  ) {\n    stakedToken = _stakedToken;\n    rewardToken = _rewardToken;\n    rewardPerSecond = _rewardPerSecond;\n    startTime = _startTime;\n    endTime = _endTime;\n    lockDuration = _lockDuration;\n    lastRewardTime = startTime;\n  }\n\n  /*\n   * @notice isFrozen is true => user cannot call deposit, withdraw function\n   */\n  function isFrozen() public view returns (bool) {\n    return block.timestamp >= freezeStartTime && block.timestamp <= freezeEndTime;\n  }\n\n  /*\n   * @notice View function to see pending reward on frontend.\n   * @param _user: user address\n   * @param _depositId: deposit id\n   * @return Pending reward for a given user and depositId\n   */\n  function pendingReward(address _user, uint256 _depositId) external view returns (uint256) {\n    DepositInfo storage deposit = depositInfos[_user][_depositId];\n    if (block.timestamp > lastRewardTime && totalStakingTokens != 0) {\n      uint256 multiplier = _getMultiplier(lastRewardTime, block.timestamp);\n      uint256 tokenReward = multiplier * rewardPerSecond;\n      uint256 adjustedTokenPerShare = accTokenPerShare + ((tokenReward * _PRECISION_FACTOR) / totalStakingTokens);\n      return\n        deposit.rewardPending + (((deposit.amount * adjustedTokenPerShare) / _PRECISION_FACTOR) - deposit.rewardDebt);\n    } else {\n      return deposit.rewardPending + (((deposit.amount * accTokenPerShare) / _PRECISION_FACTOR) - deposit.rewardDebt);\n    }\n  }\n\n  /*\n   * @notice Length of users\n   */\n  function getUserListLength() external view returns (uint) {\n    return userList.length;\n  }\n\n  /*\n   * @notice View function to get users.\n   * @param _offset: offset for paging\n   * @param _limit: limit for paging\n   * @return get users, next offset and total users\n   */\n  function getUsersPaging(\n    uint _offset,\n    uint _limit\n  ) external view returns (UserInfo[] memory users, uint nextOffset, uint total) {\n    uint totalUsers = userList.length;\n    if (_limit == 0) {\n      _limit = 1;\n    }\n\n    if (_limit > totalUsers - _offset) {\n      _limit = totalUsers - _offset;\n    }\n\n    UserInfo[] memory values = new UserInfo[](_limit);\n    for (uint i = 0; i < _limit; i++) {\n      values[i] = userInfos[userList[_offset + i]];\n    }\n\n    return (values, _offset + _limit, totalUsers);\n  }\n\n  /*\n   * @notice Deposit staked tokens and collect reward tokens (if any)\n   * @param _amount: amount to withdraw (in rewardToken)\n   */\n  function depositTokens(uint256 _amount) external nonReentrant {\n    require(block.timestamp >= startTime && block.timestamp <= endTime, \"Invalid time\");\n    require(!isFrozen(), \"Deposit is frozen\");\n    require(_amount > 0, \"Invalid amount\");\n    address sender_ = _msgSender();\n\n    UserInfo storage user = userInfos[sender_];\n    require(_amount + user.totalAmount >= minDepositAmount, \"User amount below minimum\");\n    if (poolLimitPerUser > 0) {\n      require(_amount + user.totalAmount <= poolLimitPerUser, \"User amount above limit\");\n    }\n\n    _updatePool();\n\n    if (!user.isAdded) {\n      user.isAdded = true;\n      user.addr = sender_;\n      userList.push(sender_);\n    }\n\n    DepositInfo storage deposit = depositInfos[sender_][user.nextDepositId++];\n    if (deposit.amount > 0) {\n      deposit.rewardPending += ((deposit.amount * accTokenPerShare) / _PRECISION_FACTOR) - deposit.rewardDebt;\n    }\n\n    // Check real amount to avoid taxed token\n    uint256 previousBalance_ = stakedToken.balanceOf(address(this));\n    stakedToken.safeTransferFrom(sender_, address(this), _amount);\n    uint256 newBalance_ = stakedToken.balanceOf(address(this));\n    uint256 addedAmount_ = newBalance_ - previousBalance_;\n\n    user.totalAmount += addedAmount_;\n    totalStakingTokens += addedAmount_;\n\n    deposit.amount += addedAmount_;\n    deposit.lockFrom = block.timestamp;\n    deposit.lockTo = block.timestamp + lockDuration;\n    deposit.rewardDebt = (deposit.amount * accTokenPerShare) / _PRECISION_FACTOR;\n\n    emit EDeposit(sender_, addedAmount_, user.nextDepositId - 1);\n  }\n\n  /*\n   * @notice Withdraw staked tokens and collect reward tokens\n   */\n  function withdrawTokens(address _staker, uint256 _amount, uint256 _depositId) external nonReentrant {\n    require(!isFrozen(), \"Withdraw is frozen\");\n    require(_amount > 0, \"Invalid amount\");\n    address trigger_ = _msgSender();\n\n    if (trigger_ != _staker) {\n      require(delegators[_staker][trigger_], \"Invalid user\");\n    }\n\n    DepositInfo storage deposit = depositInfos[_staker][_depositId];\n    require(deposit.amount >= _amount, \"Amount to withdraw too high\");\n    require(block.timestamp >= deposit.lockTo, \"Invalid time to withdraw\");\n\n    _updatePool();\n\n    deposit.rewardPending += ((deposit.amount * accTokenPerShare) / _PRECISION_FACTOR) - deposit.rewardDebt;\n    uint256 pending = deposit.rewardPending;\n    if (pending > 0) {\n      deposit.rewardPending = 0;\n      _safeRewardTransfer(trigger_, pending);\n    }\n\n    UserInfo storage user = userInfos[_staker];\n    user.totalAmount -= _amount;\n    totalStakingTokens -= _amount;\n\n    deposit.amount -= _amount;\n    stakedToken.safeTransfer(trigger_, _amount);\n    deposit.rewardDebt = (deposit.amount * accTokenPerShare) / _PRECISION_FACTOR;\n\n    emit EWithdraw(_staker, _amount, _depositId);\n  }\n\n  /*\n   * @dev Set delegator\n   */\n  function setDelegators(address _delegator, bool _status) external nonReentrant {\n    delegators[_msgSender()][_delegator] = _status;\n  }\n\n  /*\n   * @dev Update lock duration\n   */\n  function setLockDuration(uint256 _duration) external onlyOwner {\n    lockDuration = _duration;\n  }\n\n  /**\n   * @notice It allows the admin to add reward tokens\n   * @param _amount: amount of tokens\n   * @dev This function is only callable by admin.\n   */\n  function addRewardTokens(uint256 _amount) external onlyOwner {\n    // Check real amount to avoid taxed token\n    uint256 previousBalance_ = rewardToken.balanceOf(address(this));\n    rewardToken.safeTransferFrom(msg.sender, address(this), _amount);\n    uint256 newBalance_ = rewardToken.balanceOf(address(this));\n    uint256 addedAmount_ = newBalance_ - previousBalance_;\n\n    totalRewardTokens += addedAmount_;\n    emit EAddRewardTokens(msg.sender, addedAmount_);\n  }\n\n  /**\n   * @notice It allows the admin to correct reward tokens\n   */\n  function correctRewardTokens(uint256 _amount) external onlyOwner {\n    totalRewardTokens = _amount;\n  }\n\n  /**\n   * @notice It allows the admin to recover wrong tokens sent to the contract\n   * @param _tokenAddress: the address of the token to withdraw\n   * @param _tokenAmount: the number of tokens to withdraw\n   * @dev This function is only callable by admin.\n   */\n  function recoverWrongTokens(address _tokenAddress, uint256 _tokenAmount) external onlyOwner {\n    require(_tokenAddress != address(stakedToken), \"Cannot be staked token\");\n    require(_tokenAddress != address(rewardToken), \"Cannot be reward token\");\n\n    IERC20(_tokenAddress).safeTransfer(msg.sender, _tokenAmount);\n  }\n\n  /*\n   * @notice Stop rewards\n   * @dev Only callable by owner\n   */\n  function stopReward() external onlyOwner {\n    endTime = block.timestamp;\n  }\n\n  /*\n   * @notice Stop Freeze\n   * @dev Only callable by owner\n   */\n  function stopFreeze() external onlyOwner {\n    freezeStartTime = 0;\n    freezeEndTime = 0;\n  }\n\n  /*\n   * @notice Update reward per second\n   * @dev Only callable by owner.\n   * @param _rewardPerSecond: the reward per second\n   */\n  function setRewardPerSecond(uint256 _rewardPerSecond) external onlyOwner {\n    _updatePool();\n    rewardPerSecond = _rewardPerSecond;\n  }\n\n  /**\n   * @notice It allows the admin to update start and end time\n   * @dev This function is only callable by owner.\n   * @param _startTime: the new start time\n   * @param _endTime: the new end time\n   */\n  function setStartAndEndTimes(uint256 _startTime, uint256 _endTime) external onlyOwner {\n    require(block.timestamp > endTime, \"Pool has started\");\n    require(_startTime < _endTime, \"Invalid start and end block\");\n    endTime = _endTime;\n\n    if (_startTime > block.timestamp) {\n      startTime = _startTime;\n      // Set the lastRewardTime as the startTime\n      lastRewardTime = startTime;\n    }\n  }\n\n  /**\n   * @notice It allows the admin to update freeze start and end time\n   * @dev This function is only callable by owner.\n   * @param _freezeStartTime: the new freeze start time\n   * @param _freezeEndTime: the new freeze end time\n   */\n  function setFreezaTimes(uint256 _freezeStartTime, uint256 _freezeEndTime) external onlyOwner {\n    require(_freezeStartTime < _freezeEndTime, \"Invalid start and end time\");\n    require(block.timestamp < _freezeStartTime, \"Invalid start and current\");\n\n    freezeStartTime = _freezeStartTime;\n    freezeEndTime = _freezeEndTime;\n  }\n\n  /*\n   * @notice Update pool limit per user\n   * @dev Only callable by owner.\n   * @param _poolLimitPerUser: new pool limit per user\n   */\n  function setPoolLimitPerUser(uint256 _poolLimitPerUser) external onlyOwner {\n    poolLimitPerUser = _poolLimitPerUser;\n  }\n\n  /**\n   * @notice Update minimum deposit amount\n   * @dev This function is only callable by owner.\n   * @param _minDepositAmount: the new minimum deposit amount\n   */\n  function setMinDepositAmount(uint256 _minDepositAmount) external onlyOwner {\n    minDepositAmount = _minDepositAmount;\n  }\n\n  /*\n   * @notice Stop rewards\n   * @dev Only callable by owner. Needs to be for emergency.\n   */\n  function safeWithdrawReward(uint256 _amount) external onlyOwner {\n    totalRewardTokens -= _amount;\n    rewardToken.safeTransfer(msg.sender, _amount);\n  }\n\n  /**\n   * @dev Emergency case withdraw tokens\n   * @param _token token address\n   * @param _to destination address\n   * @param _amount token amount\n   */\n  function emergencyWithdrawTokens(address _token, address _to, uint256 _amount) external onlyOwner {\n    IERC20(_token).safeTransfer(_to, _amount);\n  }\n\n  /*\n   * @notice Update reward variables of the given pool to be up-to-date.\n   */\n  function _updatePool() private {\n    if (block.timestamp <= lastRewardTime) {\n      return;\n    }\n\n    if (totalStakingTokens == 0) {\n      lastRewardTime = block.timestamp;\n      return;\n    }\n\n    uint256 multiplier = _getMultiplier(lastRewardTime, block.timestamp);\n    uint256 tokenReward = multiplier * rewardPerSecond;\n    accTokenPerShare += (tokenReward * _PRECISION_FACTOR) / totalStakingTokens;\n    lastRewardTime = block.timestamp;\n  }\n\n  /*\n   * @notice Return reward multiplier over the given _from to _to time.\n   * @param _from: time to start\n   * @param _to: time to finish\n   */\n  function _getMultiplier(uint256 _from, uint256 _to) private view returns (uint256) {\n    if (_to <= endTime) {\n      return _to - _from;\n    } else if (_from >= endTime) {\n      return 0;\n    } else {\n      return endTime - _from;\n    }\n  }\n\n  /*\n   * @notice Transfer reward tokens.\n   * @param _to: address where tokens will transfer\n   * @param _amount: amount of tokens\n   */\n  function _safeRewardTransfer(address _to, uint256 _amount) private {\n    uint256 rewardTokenBal = totalRewardTokens;\n    if (_amount > rewardTokenBal) {\n      totalRewardTokens -= rewardTokenBal;\n      rewardToken.safeTransfer(_to, rewardTokenBal);\n    } else {\n      totalRewardTokens -= _amount;\n      rewardToken.safeTransfer(_to, _amount);\n    }\n  }\n}\n"
      }
    },
    "settings": {
      "optimizer": {
        "enabled": true,
        "runs": 200
      },
      "outputSelection": {
        "*": {
          "*": [
            "evm.bytecode",
            "evm.deployedBytecode",
            "devdoc",
            "userdoc",
            "metadata",
            "abi"
          ]
        }
      },
      "libraries": {}
    }
  }}