// File: lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @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);
}

// File: src/FuelBridgeReceiver.sol



// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity ^0.8.7;

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

/**
 * @title  Fuel Bridge Receiver on Ethereum
 * @notice Exited GET is sent to the contract to be sent to the staking contracts.
 * @author GET Protocol DAO
 */
contract FuelBridgeReceiver is IFuelBridgeReceiver {
    IERC20 public rootToken;
    address public destination;
    uint256 private locked = 1; // Used in reentrancy check.

    constructor(address rootToken_, address destination_) {
        rootToken = IERC20(rootToken_);
        destination = destination_;
    }

    /*░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
    ░░░░                         Public Functions                          ░░░░
    ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░*/

    /**
     * @inheritdoc IFuelBridgeReceiver
     */
    function transferToStakers() external override {
        uint256 rootTokenBalance_ = rootToken.balanceOf(address(this));

        require(rootToken.transfer(destination, rootTokenBalance_), "FBR:TRANSFER_FAILED");

        emit TransferredToStakers(rootTokenBalance_);
    }
}

// File: src/interfaces/IFuelBridgeReceiver.sol



// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity ^0.8.7;

interface IFuelBridgeReceiver {
    /**
     * @notice Emitted when childToken is burned for the Polygon PoS withdrawal.
     * @param  amount of parentToken transferred to stakers
     */
    event TransferredToStakers(uint256 amount);

    /**
     * @notice Transfers the total amount of parentTokens to the staking contract.
     */
    function transferToStakers() external;
}