pragma solidity ^0.8.20;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import './IToken20.sol';

contract Bridge {
  address public admin;
  IToken public token;
  uint public nonce;
  mapping(uint => bool) public processedNonces;
  uint256 public minBridgableAmount;

  enum Step { Burn, Mint }
  event Transfer(
    address from,
    address to,
    uint amount,
    uint date,
    uint nonce,
    Step indexed step
  );

  constructor(address _token) {
    admin = msg.sender;
    token = IToken(_token);
  }

  function transferOwnership(address newOwner) public {
        require(msg.sender == admin, 'only admin');
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        admin = newOwner;
    }

  function burn(address to, uint amount) external {
    require(amount >= minBridgableAmount, 'too low amount to bridge');
    token.burn(msg.sender, amount);
    emit Transfer(
      msg.sender,
      to,
      amount,
      block.timestamp,
      nonce,
      Step.Burn
    );
    nonce++;
  }

  function transfer(address to, uint amount, uint otherChainNonce) external {
    require(msg.sender == admin, 'only admin');
    require(processedNonces[otherChainNonce] == false, 'transfer already processed');
    processedNonces[otherChainNonce] = true;
    token.transfer(to, amount);
    emit Transfer(
      msg.sender,
      to,
      amount,
      block.timestamp,
      otherChainNonce,
      Step.Mint
    );
  }

  function setMinBridgableAmount(uint256 newMinAmount) public {
    require(msg.sender == admin, 'only admin');
    require(newMinAmount > 0, "MinAmountController: Minimum amount must be greater than 0");
    minBridgableAmount = newMinAmount;
    }

  function withdrawEther(address payable to, uint amount) public {
    require(msg.sender == admin, 'only admin');
    require(address(this).balance >= amount, "insufficient balance");
    (bool sent, ) = to.call{value: amount}("");
    require(sent, "Failed to send Ether");
    }

    function withdrawToken(IERC20 t, address to, uint amount) public {
        require(msg.sender == admin, 'only admin');
        require(t.balanceOf(address(this)) >= amount, "insufficient token balance");
        bool sent = t.transfer(to, amount);
        require(sent, "Failed to transfer tokens");
    }

  receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

pragma solidity ^0.8.20;

interface IToken {
  function mint(address to, uint amount) external;
  function burn(address owner, uint amount) external;
  function transfer(address to, uint256 value) external;
}

{
  "compilationTarget": {
    "contracts/Bridge.sol": "Bridge"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}