// 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/Shop.sol



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

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

contract Shop {
    address payable public owner;
    address public tokenAddress;

    event EthOrderPayment(string orderId, uint amount);
    event TokenOrderPayment(string orderId, uint amount);

    mapping(string => uint) private ethPayments;
    mapping(string => uint) private tokenPayments;

    constructor(address _tokenAddress, address _owner) {
        owner = payable(_owner);
        tokenAddress = _tokenAddress;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "Only the contract owner can perform this action");
        _;
    }

    function payWithEth(string memory orderID) public payable {
        require(msg.value > 0, "Must send some ether");
        ethPayments[orderID] += msg.value;
        emit EthOrderPayment(orderID, ethPayments[orderID]);
    }

    function payWithToken(string memory orderID, uint256 amount) public {
        require(amount > 0, "Must send some tokens");
        require(IERC20(tokenAddress).transferFrom(msg.sender, address(this), amount), "Token transfer failed");
        tokenPayments[orderID] += amount;
        emit TokenOrderPayment(orderID, tokenPayments[orderID]);
    }

    function withdrawEther() public onlyOwner {
        payable(owner).transfer(address(this).balance);
    }

    // Function to withdraw ERC-20 tokens from the contract (only owner)
    function withdrawTokens() public onlyOwner {
        IERC20 token = IERC20(tokenAddress);
        uint256 balance = token.balanceOf(address(this));
        require(balance > 0, "No tokens to withdraw");   
        require(
            token.transfer(owner, balance),
            "Token transfer failed"
        );
    }

    function getTokenPayments(string memory orderID) public view returns (uint) {
        return tokenPayments[orderID];
    }

    function getEthPayments(string memory orderID) public view returns (uint) {
        return ethPayments[orderID];
    } 

    function updateTokenAddress(address _tokenAddress) public onlyOwner {
        tokenAddress = _tokenAddress;
    }
}