creation_sourcecode: // SPDX-License-Identifier: MIT
  pragma solidity 0.6.12;
  
  
  /**
   * @dev Standard math utilities missing in the Solidity language.
   */
  library MathUtil {
      /**
       * @dev Returns the smallest of two numbers.
       */
      function min(uint256 a, uint256 b) internal pure returns (uint256) {
          return a < b ? a : b;
      }
  }
  
  contract ReentrancyGuard {
      uint256 private _guardCounter;
  
      constructor () internal {
          _guardCounter = 1;
      }
  
      modifier nonReentrant() {
          _guardCounter += 1;
          uint256 localCounter = _guardCounter;
          _;
          require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
      }
  }
  
  interface ICurveGauge {
      function deposit(uint256) external;
      function balanceOf(address) external view returns (uint256);
      function withdraw(uint256) external;
      function claim_rewards() external;
      function reward_tokens(uint256) external view returns(address);//v2
      function rewarded_token() external view returns(address);//v1
  }
  
  interface ICurveVoteEscrow {
      function create_lock(uint256, uint256) external;
      function increase_amount(uint256) external;
      function increase_unlock_time(uint256) external;
      function withdraw() external;
      function smart_wallet_checker() external view returns (address);
  }
  
  interface IWalletChecker {
      function check(address) external view returns (bool);
  }
  
  interface IVoting{
      function vote(uint256, bool, bool) external; //voteId, support, executeIfDecided
      function getVote(uint256) external view returns(bool,bool,uint64,uint64,uint64,uint64,uint256,uint256,uint256,bytes memory); 
      function vote_for_gauge_weights(address,uint256) external;
  }
  
  interface IMinter{
      function mint(address) external;
  }
  
  interface IRegistry{
      function get_registry() external view returns(address);
      function get_address(uint256 _id) external view returns(address);
      function gauge_controller() external view returns(address);
      function get_lp_token(address) external view returns(address);
      function get_gauges(address) external view returns(address[10] memory,uint128[10] memory);
  }
  
  interface IStaker{
      function deposit(address, address) external;
      function withdraw(address) external;
      function withdraw(address, address, uint256) external;
      function withdrawAll(address, address) external;
      function createLock(uint256, uint256) external;
      function increaseAmount(uint256) external;
      function increaseTime(uint256) external;
      function release() external;
      function claimCrv(address) external returns (uint256);
      function claimRewards(address) external;
      function claimFees(address,address) external;
      function setStashAccess(address, bool) external;
      function vote(uint256,address,bool) external;
      function voteGaugeWeight(address,uint256) external;
      function balanceOfPool(address) external view returns (uint256);
      function operator() external view returns (address);
      function execute(address _to, uint256 _value, bytes calldata _data) external returns (bool, bytes memory);
  }
  
  interface IRewards{
      function stake(address, uint256) external;
      function stakeFor(address, uint256) external;
      function withdraw(address, uint256) external;
      function exit(address) external;
      function getReward(address) external;
      function queueNewRewards(uint256) external;
      function notifyRewardAmount(uint256) external;
      function addExtraReward(address) external;
      function stakingToken() external returns (address);
  }
  
  interface IStash{
      function stashRewards() external returns (bool);
      function processStash() external returns (bool);
      function claimRewards() external returns (bool);
  }
  
  interface IFeeDistro{
      function claim() external;
      function token() external view returns(address);
  }
  
  interface ITokenMinter{
      function mint(address,uint256) external;
      function burn(address,uint256) external;
  }
  
  interface IDeposit{
      function isShutdown() external view returns(bool);
      function balanceOf(address _account) external view returns(uint256);
      function totalSupply() external view returns(uint256);
      function poolInfo(uint256) external view returns(address,address,address,address,address, bool);
      function rewardClaimed(uint256,address,uint256) external;
      function withdrawTo(uint256,uint256,address) external;
      function claimRewards(uint256,address) external returns(bool);
      function rewardArbitrator() external returns(address);
  }
  
  interface ICrvDeposit{
      function deposit(uint256, bool) external;
      function lockIncentive() external view returns(uint256);
  }
  
  interface IRewardFactory{
      function setAccess(address,bool) external;
      function CreateCrvRewards(uint256,address) external returns(address);
      function CreateTokenRewards(address,address,address) external returns(address);
      function activeRewardCount(address) external view returns(uint256);
      function addActiveReward(address,uint256) external returns(bool);
      function removeActiveReward(address,uint256) external returns(bool);
  }
  
  interface IStashFactory{
      function CreateStash(uint256,address,address,uint256) external returns(address);
  }
  
  interface ITokenFactory{
      function CreateDepositToken(address) external returns(address);
  }
  
  interface IPools{
      function addPool(address _lptoken, address _gauge, uint256 _stashVersion) external returns(bool);
      function shutdownPool(uint256 _pid) external returns(bool);
      function poolInfo(uint256) external view returns(address,address,address,address,address,bool);
      function poolLength() external view returns (uint256);
      function gaugeMap(address) external view returns(bool);
      function setPoolManager(address _poolM) external;
  }
  
  interface IVestedEscrow{
      function fund(address[] calldata _recipient, uint256[] calldata _amount) external returns(bool);
  }
  
  // File: @openzeppelin\contracts\math\SafeMath.sol
  
  pragma solidity >=0.6.0 <0.8.0;
  
  /**
   * @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;
      }
  }
  
  // File: @openzeppelin\contracts\token\ERC20\IERC20.sol
  
  pragma solidity >=0.6.0 <0.8.0;
  
  /**
   * @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);
  }
  
  // File: @openzeppelin\contracts\utils\Address.sol
  
  pragma solidity >=0.6.2 <0.8.0;
  
  /**
   * @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);
              }
          }
      }
  }
  
  // File: @openzeppelin\contracts\token\ERC20\SafeERC20.sol
  
  pragma solidity >=0.6.0 <0.8.0;
  
  
  /**
   * @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");
          }
      }
  }
  
  // File: contracts\BaseRewardPool.sol
  
  pragma solidity 0.6.12;
  /**
   *Submitted for verification at Etherscan.io on 2020-07-17
   */
  
  /*
     ____            __   __        __   _
    / __/__ __ ___  / /_ / /  ___  / /_ (_)__ __
   _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
  /___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
       /___/
  
  * Synthetix: BaseRewardPool.sol
  *
  * Docs: https://docs.synthetix.io/
  *
  *
  * MIT License
  * ===========
  *
  * Copyright (c) 2020 Synthetix
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in all
  * copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  */
  
  
  contract BaseRewardPool {
       using SafeMath for uint256;
      using SafeERC20 for IERC20;
  
      IERC20 public rewardToken;
      IERC20 public stakingToken;
      uint256 public constant duration = 7 days;
  
      address public operator;
      address public rewardManager;
  
      uint256 public pid;
      uint256 public periodFinish = 0;
      uint256 public rewardRate = 0;
      uint256 public lastUpdateTime;
      uint256 public rewardPerTokenStored;
      uint256 public queuedRewards = 0;
      uint256 public currentRewards = 0;
      uint256 public historicalRewards = 0;
      uint256 public constant newRewardRatio = 830;
      uint256 private _totalSupply;
      mapping(address => uint256) public userRewardPerTokenPaid;
      mapping(address => uint256) public rewards;
      mapping(address => uint256) private _balances;
  
      address[] public extraRewards;
  
      event RewardAdded(uint256 reward);
      event Staked(address indexed user, uint256 amount);
      event Withdrawn(address indexed user, uint256 amount);
      event RewardPaid(address indexed user, uint256 reward);
  
      constructor(
          uint256 pid_,
          address stakingToken_,
          address rewardToken_,
          address operator_,
          address rewardManager_
      ) public {
          pid = pid_;
          stakingToken = IERC20(stakingToken_);
          rewardToken = IERC20(rewardToken_);
          operator = operator_;
          rewardManager = rewardManager_;
      }
  
      function totalSupply() public view returns (uint256) {
          return _totalSupply;
      }
  
      function balanceOf(address account) public view returns (uint256) {
          return _balances[account];
      }
  
      function extraRewardsLength() external view returns (uint256) {
          return extraRewards.length;
      }
  
      function addExtraReward(address _reward) external returns(bool){
          require(msg.sender == rewardManager, "!authorized");
          require(_reward != address(0),"!reward setting");
  
          extraRewards.push(_reward);
          return true;
      }
      function clearExtraRewards() external{
          require(msg.sender == rewardManager, "!authorized");
          delete extraRewards;
      }
  
      modifier updateReward(address account) {
          rewardPerTokenStored = rewardPerToken();
          lastUpdateTime = lastTimeRewardApplicable();
          if (account != address(0)) {
              rewards[account] = earned(account);
              userRewardPerTokenPaid[account] = rewardPerTokenStored;
          }
          _;
      }
  
      function lastTimeRewardApplicable() public view returns (uint256) {
          return MathUtil.min(block.timestamp, periodFinish);
      }
  
      function rewardPerToken() public view returns (uint256) {
          if (totalSupply() == 0) {
              return rewardPerTokenStored;
          }
          return
              rewardPerTokenStored.add(
                  lastTimeRewardApplicable()
                      .sub(lastUpdateTime)
                      .mul(rewardRate)
                      .mul(1e18)
                      .div(totalSupply())
              );
      }
  
      function earned(address account) public view returns (uint256) {
          return
              balanceOf(account)
                  .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                  .div(1e18)
                  .add(rewards[account]);
      }
  
      function stake(uint256 _amount)
          public
          updateReward(msg.sender)
          returns(bool)
      {
          require(_amount > 0, 'RewardPool : Cannot stake 0');
          
          //also stake to linked rewards
          for(uint i=0; i < extraRewards.length; i++){
              IRewards(extraRewards[i]).stake(msg.sender, _amount);
          }
  
          _totalSupply = _totalSupply.add(_amount);
          _balances[msg.sender] = _balances[msg.sender].add(_amount);
  
          stakingToken.safeTransferFrom(msg.sender, address(this), _amount);
          emit Staked(msg.sender, _amount);
  
          
          return true;
      }
  
      function stakeAll() external returns(bool){
          uint256 balance = stakingToken.balanceOf(msg.sender);
          stake(balance);
          return true;
      }
  
      function stakeFor(address _for, uint256 _amount)
          public
          updateReward(_for)
          returns(bool)
      {
          require(_amount > 0, 'RewardPool : Cannot stake 0');
          
          //also stake to linked rewards
          for(uint i=0; i < extraRewards.length; i++){
              IRewards(extraRewards[i]).stake(_for, _amount);
          }
  
          //give to _for
          _totalSupply = _totalSupply.add(_amount);
          _balances[_for] = _balances[_for].add(_amount);
  
          //take away from sender
          stakingToken.safeTransferFrom(msg.sender, address(this), _amount);
          emit Staked(_for, _amount);
          
          return true;
      }
  
  
      function withdraw(uint256 amount, bool claim)
          public
          updateReward(msg.sender)
          returns(bool)
      {
          require(amount > 0, 'RewardPool : Cannot withdraw 0');
  
          //also withdraw from linked rewards
          for(uint i=0; i < extraRewards.length; i++){
              IRewards(extraRewards[i]).withdraw(msg.sender, amount);
          }
  
          _totalSupply = _totalSupply.sub(amount);
          _balances[msg.sender] = _balances[msg.sender].sub(amount);
  
          stakingToken.safeTransfer(msg.sender, amount);
          emit Withdrawn(msg.sender, amount);
       
          if(claim){
              getReward(msg.sender,true);
          }
  
          return true;
      }
  
      function withdrawAll(bool claim) external{
          withdraw(_balances[msg.sender],claim);
      }
  
      function withdrawAndUnwrap(uint256 amount, bool claim) public updateReward(msg.sender) returns(bool){
  
          //also withdraw from linked rewards
          for(uint i=0; i < extraRewards.length; i++){
              IRewards(extraRewards[i]).withdraw(msg.sender, amount);
          }
          
          _totalSupply = _totalSupply.sub(amount);
          _balances[msg.sender] = _balances[msg.sender].sub(amount);
  
          //tell operator to withdraw from here directly to user
          IDeposit(operator).withdrawTo(pid,amount,msg.sender);
          emit Withdrawn(msg.sender, amount);
  
          //get rewards too
          if(claim){
              getReward(msg.sender,true);
          }
          return true;
      }
  
      function withdrawAllAndUnwrap(bool claim) external{
          withdrawAndUnwrap(_balances[msg.sender],claim);
      }
  
      function getReward(address _account, bool _claimExtras) public updateReward(_account) returns(bool){
          uint256 reward = earned(_account);
          if (reward > 0) {
              rewards[_account] = 0;
              rewardToken.safeTransfer(_account, reward);
              IDeposit(operator).rewardClaimed(pid, _account, reward);
              emit RewardPaid(_account, reward);
          }
  
          //also get rewards from linked rewards
          if(_claimExtras){
              for(uint i=0; i < extraRewards.length; i++){
                  IRewards(extraRewards[i]).getReward(_account);
              }
          }
          return true;
      }
  
      function getReward() external returns(bool){
          getReward(msg.sender,true);
          return true;
      }
  
      function donate(uint256 _amount) external returns(bool){
          IERC20(rewardToken).safeTransferFrom(msg.sender, address(this), _amount);
          queuedRewards = queuedRewards.add(_amount);
      }
  
      function queueNewRewards(uint256 _rewards) external returns(bool){
          require(msg.sender == operator, "!authorized");
  
          _rewards = _rewards.add(queuedRewards);
  
          if (block.timestamp >= periodFinish) {
              notifyRewardAmount(_rewards);
              queuedRewards = 0;
              return true;
          }
  
          //et = now - (finish-duration)
          uint256 elapsedTime = block.timestamp.sub(periodFinish.sub(duration));
          //current at now: rewardRate * elapsedTime
          uint256 currentAtNow = rewardRate * elapsedTime;
          uint256 queuedRatio = currentAtNow.mul(1000).div(_rewards);
  
          //uint256 queuedRatio = currentRewards.mul(1000).div(_rewards);
          if(queuedRatio < newRewardRatio){
              notifyRewardAmount(_rewards);
              queuedRewards = 0;
          }else{
              queuedRewards = _rewards;
          }
          return true;
      }
  
      function notifyRewardAmount(uint256 reward)
          internal
          updateReward(address(0))
      {
          historicalRewards = historicalRewards.add(reward);
          if (block.timestamp >= periodFinish) {
              rewardRate = reward.div(duration);
          } else {
              uint256 remaining = periodFinish.sub(block.timestamp);
              uint256 leftover = remaining.mul(rewardRate);
              reward = reward.add(leftover);
              rewardRate = reward.div(duration);
          }
          currentRewards = reward;
          lastUpdateTime = block.timestamp;
          periodFinish = block.timestamp.add(duration);
          emit RewardAdded(reward);
      }
  }