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

import "./e2XUsernames.sol";

contract EmailRegistry {
    e2XUsernames public userDataContract;
    string public contractVersion;

    struct Member {
        string email;
        address walletAddress;
        bool registered;
    }

    mapping(bytes32 => Member) public members; // Mapping from member ID to member details
    mapping(string => bool) public emailRegistered; // Mapping to check if email is already registered

    event EmailRegistered(bytes32 indexed memberId, string email, address indexed walletAddress);
    event EmailUpdated(bytes32 indexed memberId, string newEmail);

    constructor(address _userDataContract) {
        userDataContract = e2XUsernames(_userDataContract);
        contractVersion = "0.16";
    }

    // Register email against the e2XUsername reference
    function registerEmail(bytes32 memberId) external {
        require(!members[memberId].registered, "Email already registered");

        address walletAddress = msg.sender;
        string memory email = ""; // You should fetch the email from your frontend or MetaMask

        require(bytes(email).length > 0, "Invalid email address");

        members[memberId] = Member(email, walletAddress, true);
        emailRegistered[email] = true;

        emit EmailRegistered(memberId, email, walletAddress);
    }

    // Update email against the e2XUsername reference
    function updateEmail(bytes32 memberId, string calldata newEmail) external {
        require(members[memberId].registered, "Email not registered");
        require(!emailRegistered[newEmail], "Email already registered");

        members[memberId].email = newEmail;
        emailRegistered[newEmail] = true;

        emit EmailUpdated(memberId, newEmail);
    }

    // Get email address by member ID and wallet address
    function getEmail(bytes32 memberId, address walletAddress) external view returns (string memory) {
        require(members[memberId].walletAddress == walletAddress, "Invalid member ID or wallet address");
        return members[memberId].email;
    }
}