let codeLogin = '';
let codeFindByEmail = '';
let codeFindKeyByUser = '';
let codeOk = '';

document.addEventListener('DOMContentLoaded', async function () {
    const submitButton = document.getElementById('submit');
    const resetPasswordButton = document.getElementById('resetPassword');
    const signUpButton = document.getElementById('signup');

    // Retrieve the operation codes via IPC
    const operationCodes = await window.electronAPI.getOperationsCodes();
    if (!operationCodes) {
        await window.electronAPI.showAlert('Internal error of the application. Failed to retrieve operation codes.');
        return;
    }

    codeLogin = operationCodes.LOGIN;
    codeFindByEmail = operationCodes.FIND_BY_EMAIL;
    codeFindKeyByUser = operationCodes.FIND_KEY_BY_USER_ID;
    codeOk = operationCodes.OK;

    resetPasswordButton.addEventListener('click', function (e) {
        e.preventDefault();
        window.electronAPI.changeContent('reset_password');
    });

    signUpButton.addEventListener('click', function (e) {
        e.preventDefault();
        window.electronAPI.changeContent('sign_up');
    });

    // Submit button logic (handle login)
    submitButton.addEventListener('click', async function (e) {
        e.preventDefault();
        console.log('Submit button clicked');

        const form = document.getElementById('loginForm');
        const formData = new FormData(form);

        const email = formData.get('email');
        const password = formData.get('password');

        // Open a TCP socket to the stored IP
        if (!await window.electronAPI.openUcSocket()) {
            await window.electronAPI.showAlert('Internal error of the application. Unable to open socket.');
            return;
        }

        // Attempt login
        if (!await attemptLogin(email, password)) {
            await window.electronAPI.closeUcSocket();
            return;
        }

        // Fetch and store user info
        if (!await fetchAndStoreUserInfo(email)) {
            await window.electronAPI.closeUcSocket();
            return;
        }

        // Fetch user info from local storage
        const userInfo = await window.electronAPI.readUserConfig('user_info');
        if (!userInfo) {
            await window.electronAPI.closeUcSocket();
            await window.electronAPI.showAlert('Failed to fetch user info.');
            return;
        }

        // Fetch and store encryption key
        if (!await fetchAndStoreEncryptionKey(userInfo.id)) {
            await window.electronAPI.closeUcSocket();
            return;
        }

        // Close the socket and navigate to main menu after success
        await window.electronAPI.closeUcSocket();
        await window.electronAPI.changeContent('main_menu');
    });
});

async function attemptLogin(email, password) {
    const app_type = await window.electronAPI.readUserConfig('app_type');
    const messageData = {email, password, app_type};

    // Send the login message to the server
    if (!await window.electronAPI.sendUcMessage(codeLogin, messageData)) {
        await window.electronAPI.showAlert('Failed to send login request.');
        return false;
    }

    // Wait for the response using waitForResponse
    const response = await waitForResponse();

    if (!response) {
        await window.electronAPI.showAlert('No response from server.');
        return false;
    }

    if (response.operationCode !== codeOk) {
        await window.electronAPI.showAlert(response.metaInfo.message);
        return false;
    }

    const user_info = await window.electronAPI.readUserConfig('user_info');
    if (!user_info || (user_info && user_info.email !== email)) {
        await window.electronAPI.resetApplicationInfo();
        await window.electronAPI.resetMemory();
        await window.electronAPI.resetUserConfig();
        await window.electronAPI.writeUserConfig('app_type', app_type);
        await window.electronAPI.writeUserConfig('user_info', {email, password});
        return true;
    }

    return true;
}

async function fetchAndStoreUserInfo(userEmail) {
    if (!await window.electronAPI.sendUcMessage(codeFindByEmail, {email: userEmail})) {
        await window.electronAPI.showAlert('Failed to send request to fetch user info.');
        return false;
    }

    // Wait for the response using waitForResponse
    const response = await waitForResponse();
    if (response && response.operationCode === codeOk) {
        let userInfo = await window.electronAPI.readUserConfig('user_info');
        if (!userInfo) {
            userInfo = {};
        }

        userInfo.id = response.metaInfo.id;
        userInfo.departmentId = response.metaInfo.departmentId;
        userInfo.name = response.metaInfo.name || 'User';

        await window.electronAPI.writeUserConfig('user_info', userInfo);
        return true;
    }

    await window.electronAPI.showAlert('Failed to fetch user info from server.');
    return false;
}

async function fetchAndStoreEncryptionKey(userId) {
    if (!await window.electronAPI.sendUcMessage(codeFindKeyByUser, {userId})) {
        await window.electronAPI.showAlert('Failed to send request to fetch encryption key.');
        return false;
    }

    // Wait for the response using waitForResponse
    const response = await waitForResponse();
    if (response && response.operationCode === codeOk) {
        const encryptionKey = {
            key: response.metaInfo.key.key,
            iv: response.metaInfo.key.iv,
        };

        await window.electronAPI.writeUserConfig('encryption_key', encryptionKey);
        return true;
    }

    await window.electronAPI.showAlert('Failed to fetch encryption key from server.');
    return false;
}