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

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '../interfaces/IStaker.sol';
import './IDpxStakingRewards.sol';

interface IDpxStaker {
  function harvest() external;

  function pendingRewardsLessFee() external view returns (uint256 pendingDpxLessFee, uint256 pendingRdpxLessFee);

  function dpxPerSecondLessFee() external view returns (uint256);

  function rdpxPerSecondLessFee() external view returns (uint256);
}

contract DpxStaker is IStaker, IDpxStaker, Ownable {
  uint256 private constant FEE_DIVISOR = 1e4;

  // DPX: 0x6C2C06790b3E3E3c38e12Ee22F8183b37a13EE55
  IERC20 public immutable stakingToken;

  // DPX: 0x6C2C06790b3E3E3c38e12Ee22F8183b37a13EE55
  IERC20 public immutable rewardToken;

  // rDPX: 0x32Eb7902D4134bf98A28b963D26de779AF92A212
  IERC20 public immutable rewardToken2;

  // StakingRewards: 0xc6D714170fE766691670f12c2b45C1f34405AAb6
  IDpxStakingRewards public immutable underlyingFarm;

  address public operator;
  address public feeCollector;
  address public rewardsDistro;

  uint112 public totalDpxHarvested;
  uint112 public totalRdpxHarvested;
  uint32 public fee; // fee in bp

  constructor(
    address _feeCollector,
    address _dpx,
    address _rdpx,
    address _underlyingFarm
  ) {
    feeCollector = _feeCollector;

    stakingToken = IERC20(_dpx);
    rewardToken = IERC20(_dpx);
    rewardToken2 = IERC20(_rdpx);
    underlyingFarm = IDpxStakingRewards(_underlyingFarm);
    fee = 1000; // 10%

    stakingToken.approve(address(underlyingFarm), type(uint256).max);
  }

  function stake(uint256 _amount) external {
    if (msg.sender != operator) {
      revert UNAUTHORIZED();
    }

    underlyingFarm.stake(_amount);
    emit Staked(_amount);
  }

  function withdraw(uint256 _amount, address _to) external {
    if (msg.sender != operator) {
      revert UNAUTHORIZED();
    }

    underlyingFarm.withdraw(_amount);
    stakingToken.transfer(_to, _amount);
    emit Withdrew(_to, _amount);
  }

  function harvest() external {
    if (msg.sender != rewardsDistro) revert UNAUTHORIZED();
    _harvest();
  }

  /** VIEWS */
  function pendingRewardsLessFee() external view returns (uint256 pendingDpxLessFee, uint256 pendingRdpxLessFee) {
    (uint256 dpxEarned, uint256 rdpxEarned) = underlyingFarm.earned(msg.sender);

    unchecked {
      pendingDpxLessFee = (dpxEarned * (FEE_DIVISOR - fee)) / FEE_DIVISOR;
      pendingRdpxLessFee = (rdpxEarned * (FEE_DIVISOR - fee)) / FEE_DIVISOR;
    }
  }

  function dpxPerSecondLessFee() external view returns (uint256) {
    unchecked {
      return (underlyingFarm.rewardRateDPX() * (FEE_DIVISOR - fee)) / FEE_DIVISOR;
    }
  }

  function rdpxPerSecondLessFee() external view returns (uint256) {
    unchecked {
      return (underlyingFarm.rewardRateRDPX() * (FEE_DIVISOR - fee)) / FEE_DIVISOR;
    }
  }

  /** PRIVATE FUNCTIONS */
  function _harvest() private {
    underlyingFarm.getReward(2);

    address _rewardsDistro = rewardsDistro;
    uint256 _fee = fee;

    uint256 r1Amt = rewardToken.balanceOf(address(this));
    uint256 r1AmtLessFee;

    if (isNotZero(r1Amt)) {
      unchecked {
        uint256 r1Fee = (r1Amt * _fee) / FEE_DIVISOR;

        r1AmtLessFee = r1Amt - r1Fee;
        totalDpxHarvested += uint112(r1AmtLessFee);

        if (isNotZero(r1Fee)) {
          rewardToken.transfer(feeCollector, r1Fee);
        }

        rewardToken.transfer(_rewardsDistro, r1AmtLessFee);
        emit Harvested(address(rewardToken), r1AmtLessFee);
      }
    }

    uint256 r2Amt = rewardToken2.balanceOf(address(this));
    uint256 r2AmtLessFee;

    if (isNotZero(r2Amt)) {
      unchecked {
        uint256 r2Fee = (r2Amt * _fee) / FEE_DIVISOR;

        r2AmtLessFee = r2Amt - r2Fee;
        totalRdpxHarvested += uint112(r2AmtLessFee);

        if (isNotZero(r2Fee)) {
          rewardToken2.transfer(feeCollector, r2Fee);
        }

        rewardToken2.transfer(_rewardsDistro, r2AmtLessFee);
        emit Harvested(address(rewardToken), r2AmtLessFee);
      }
    }
  }

  /** CHECKS */
  function isNotZero(uint256 _num) private pure returns (bool result) {
    assembly {
      result := gt(_num, 0)
    }
  }

  function isZero(uint256 _num) private pure returns (bool result) {
    assembly {
      result := iszero(_num)
    }
  }

  /** OWNER FUNCTIONS */

  /**
    Owner can retrieve stuck funds
   */
  function retrieve(IERC20 token) external onlyOwner {
    if (isNotZero(address(this).balance)) {
      payable(owner()).transfer(address(this).balance);
    }

    token.transfer(owner(), token.balanceOf(address(this)));
  }

  /**
    Exit farm for veBoost migration
   */
  function exit() external onlyOwner {
    uint256 vaultBalance = underlyingFarm.balanceOf(address(this));
    address owner = owner();

    underlyingFarm.withdraw(vaultBalance);
    stakingToken.transfer(owner, vaultBalance);
    emit ExitedStaking(owner, vaultBalance);

    _harvest();
  }

  function setFee(uint32 _fee) external onlyOwner {
    if (_fee > FEE_DIVISOR) {
      revert INVALID_FEE();
    }

    emit FeeChanged(_fee, fee);
    fee = _fee;
  }

  function ownerHarvest() external onlyOwner {
    _harvest();
  }

  function setOperator(address _newOperator) external onlyOwner {
    emit OperatorChanged(_newOperator, operator);
    operator = _newOperator;
  }

  function setFeeCollector(address _newFeeCollector) external onlyOwner {
    emit FeeCollectorChanged(_newFeeCollector, feeCollector);
    feeCollector = _newFeeCollector;
  }

  function setRewardsDistro(address _newRewardsDistro) external onlyOwner {
    emit RewardsDistroChanged(_newRewardsDistro, rewardsDistro);
    rewardsDistro = _newRewardsDistro;
  }

  event Staked(uint256 _amt);
  event Withdrew(address indexed _to, uint256 _amt);
  event OperatorChanged(address indexed _new, address _old);
  event FeeCollectorChanged(address indexed _new, address _old);
  event RewardsDistroChanged(address indexed _new, address _old);
  event FeeChanged(uint256 indexed _new, uint256 _old);
  event ExitedStaking(address indexed _to, uint256 _amt);
  event Harvested(address indexed _token, uint256 _amt);

  error UNAUTHORIZED();
  error INVALID_FEE();
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^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 `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);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

interface IStaker {
  function stake(uint256) external;

  function withdraw(uint256, address) external;

  function exit() external;
}

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

interface IDpxStakingRewards {
  function stake(uint256) external;

  function exit() external;

  function compound() external;

  function withdraw(uint256) external;

  function getReward(uint256) external;

  /** VIEWS */

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

  function rewardRateDPX() external view returns (uint256);

  function rewardRateRDPX() external view returns (uint256);

  function earned(address account) external view returns (uint256 DPXtokensEarned, uint256 RDPXtokensEarned);
}

// 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;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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0000000000000000000000004bc6148306abccad5d95c0cd916249d7d08711aa0000000000000000000000006c2c06790b3e3e3c38e12ee22f8183b37a13ee5500000000000000000000000032eb7902d4134bf98a28b963d26de779af92a212000000000000000000000000c6d714170fe766691670f12c2b45c1f34405aab6

-----Decoded View---------------
Arg [0] : _feeCollector (address): 0x4bC6148306aBCcaD5D95C0cd916249d7D08711aA
Arg [1] : _dpx (address): 0x6C2C06790b3E3E3c38e12Ee22F8183b37a13EE55
Arg [2] : _rdpx (address): 0x32Eb7902D4134bf98A28b963D26de779AF92A212
Arg [3] : _underlyingFarm (address): 0xc6D714170fE766691670f12c2b45C1f34405AAb6

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000004bc6148306abccad5d95c0cd916249d7d08711aa
Arg [1] : 0000000000000000000000006c2c06790b3e3e3c38e12ee22f8183b37a13ee55
Arg [2] : 00000000000000000000000032eb7902d4134bf98a28b963d26de779af92a212
Arg [3] : 000000000000000000000000c6d714170fe766691670f12c2b45c1f34405aab6