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

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

/**
 * @title Pool booster for Metropolis pools
 * @author Origin Protocol Inc
 */
contract PoolBoosterMetropolis is IPoolBooster {
    // @notice address of the OS token
    IERC20 public immutable osToken;
    // @notice address of the pool
    address public immutable pool;
    // @notice if balance under this amount the bribe action is skipped
    uint256 public constant MIN_BRIBE_AMOUNT = 1e10;

    IRewarderFactory public immutable rewardFactory;

    IVoter public immutable voter;

    constructor(
        address _osToken,
        address _rewardFactory,
        address _pool,
        address _voter
    ) {
        require(_pool != address(0), "Invalid pool address");
        pool = _pool;
        // Abstract factory already validates this is not a zero address
        osToken = IERC20(_osToken);

        rewardFactory = IRewarderFactory(_rewardFactory);

        voter = IVoter(_voter);
    }

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

        uint256 id = voter.getCurrentVotingPeriod() + 1;

        // Deploy a rewarder
        IRewarder rewarder = IRewarder(
            rewardFactory.createBribeRewarder(address(osToken), pool)
        );

        // Approve the rewarder to spend the balance
        osToken.approve(address(rewarder), balance);

        // Fund and bribe the rewarder
        rewarder.fundAndBribe(id, id, balance);

        emit BribeExecuted(balance);
    }
}

interface IRewarderFactory {
    function createBribeRewarder(address token, address pool)
        external
        returns (address rewarder);

    function getWhitelistedTokenInfo(address token)
        external
        view
        returns (bool isWhitelisted, uint256 minBribeAmount);
}

interface IRewarder {
    function fundAndBribe(
        uint256 startId,
        uint256 lastId,
        uint256 amountPerPeriod
    ) external payable;
}

interface IVoter {
    function getCurrentVotingPeriod() external view returns (uint256);
}

// 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;
}

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

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[{"inputs":[{"internalType":"address","name":"_osToken","type":"address"},{"internalType":"address","name":"_rewardFactory","type":"address"},{"internalType":"address","name":"_pool","type":"address"},{"internalType":"address","name":"_voter","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"BribeExecuted","type":"event"},{"inputs":[],"name":"MIN_BRIBE_AMOUNT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"bribe","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"osToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pool","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardFactory","outputs":[{"internalType":"contract IRewarderFactory","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"voter","outputs":[{"internalType":"contract IVoter","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000b1e25689d55734fd3fffc939c4c3eb52dff8a794000000000000000000000000d9db92613867fe0d290ce64fe737e2f8b80cadc30000000000000000000000003987a13d675c66570bc28c955685a9bca2dcf26e00000000000000000000000003a9896a464c515d13f2679df337bf95bc891fda

-----Decoded View---------------
Arg [0] : _osToken (address): 0xb1e25689D55734FD3ffFc939c4C3Eb52DFf8A794
Arg [1] : _rewardFactory (address): 0xd9db92613867FE0d290CE64Fe737E2F8B80CADc3
Arg [2] : _pool (address): 0x3987a13D675c66570bC28c955685a9bcA2dCF26e
Arg [3] : _voter (address): 0x03A9896A464C515d13f2679df337bF95bc891fdA

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000b1e25689d55734fd3fffc939c4c3eb52dff8a794
Arg [1] : 000000000000000000000000d9db92613867fe0d290ce64fe737e2f8b80cadc3
Arg [2] : 0000000000000000000000003987a13d675c66570bc28c955685a9bca2dcf26e
Arg [3] : 00000000000000000000000003a9896a464c515d13f2679df337bf95bc891fda