// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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: contracts/Router.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract Router {
	event Stake(uint256 value);
	event Unstake(uint256 value);

	address public owner;
	address public trading;
	address public oracle;
	address public merkleTree;
	address public airdrop;
	address public backup;

	address public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
	mapping(address => uint256) public balanceOf;

	constructor() {
		owner = msg.sender;
	}

	function updateOwner(address _owner) public onlyOwner {
		owner = _owner;
	}

	function updateTrading(address _trading) public onlyOwner {
		trading = _trading;
	}

	function updateOracle(address _oracle) public onlyOwner {
		oracle = _oracle;
	}

	function updateMerkleTree(address _merkleTree) public onlyOwner {
		merkleTree = _merkleTree;
	}

	function updateAirdrop(address _airdrop) public onlyOwner {
		airdrop = _airdrop;
	}

	function updateBackup(address _backup) public onlyOwner {
		backup = _backup;
	}

	function stake(uint256 amount) public {
		IERC20(WETH).transferFrom(msg.sender, address(this), amount);
		balanceOf[msg.sender] += amount;
		emit Stake(amount);
	}

	function unstake() public {
		uint256 balanceSnapshot = balanceOf[msg.sender];
		balanceOf[msg.sender] = 0;
		IERC20(WETH).transfer(msg.sender, balanceSnapshot);
		emit Unstake(balanceSnapshot);
	}

	modifier onlyOwner() {
		require(msg.sender == owner, "!owner");
		_;
	}

}