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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { IBribe } from "../interfaces/poolBooster/ISwapXAlgebraBribe.sol";
import { IPoolBooster } from "../interfaces/poolBooster/IPoolBooster.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
 * @title Pool booster for SwapX for Classic Stable Pools and Classic Volatile Pools
 * @author Origin Protocol Inc
 */
contract PoolBoosterSwapxSingle is IPoolBooster {
    // @notice address of the Bribes.sol(Bribe) contract
    IBribe public immutable bribeContract;
    // @notice address of the OS token
    IERC20 public immutable osToken;
    // @notice if balance under this amount the bribe action is skipped
    uint256 public constant MIN_BRIBE_AMOUNT = 1e10;

    constructor(address _bribeContract, address _osToken) {
        require(_bribeContract != address(0), "Invalid bribeContract address");
        bribeContract = IBribe(_bribeContract);
        // Abstract factory already validates this is not a zero address
        osToken = IERC20(_osToken);
    }

    function bribe() external override {
        uint256 balance = osToken.balanceOf(address(this));
        // balance too small, do no bribes
        if (balance < MIN_BRIBE_AMOUNT) {
            return;
        }

        osToken.approve(address(bribeContract), balance);

        bribeContract.notifyRewardAmount(address(osToken), balance);
        emit BribeExecuted(balance);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

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

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

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IPoolBooster {
    event BribeExecuted(uint256 amount);

    /// @notice Execute the bribe action
    function bribe() external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IBribe {
    /// @notice Notify a bribe amount
    /// @dev    Rewards are saved into NEXT EPOCH mapping.
    function notifyRewardAmount(address _rewardsToken, uint256 reward) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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