let pathToFile = '';
let fetchUsersInterval = null;

document.addEventListener('DOMContentLoaded', async function () {
    const selectFileButton = document.getElementById('selectFile');
    const submitButton = document.getElementById('submitButton');
    const backButton = document.getElementById('backButton');

    selectFileButton.addEventListener('click', async function (event) {
        event.preventDefault();
        try {
            pathToFile = await window.electronAPI.selectFile();
            updateFileName();
        } catch (error) {
            console.error('Error opening file dialog:', error);
        }
    });
    submitButton.addEventListener('click', async function (event) {
        event.preventDefault();

        // Check if a file was chosen
        if (!pathToFile.trim()) {
            await window.electronAPI.showAlert('File not chosen!');
            return;
        }

        const user_info = await window.electronAPI.readUserConfig('user_info');
        if (!user_info) {
            return;
        }

        const form = document.getElementById('userDestForm');
        const checkboxes = form.querySelectorAll('input[name="users"]');
        const selectedUserIps = Array.from(checkboxes)
            .filter(checkbox => checkbox.checked)
            .map(checkbox => checkbox.value);  // Get IP of the selected users

        if (!selectedUserIps.length) {
            await window.electronAPI.showAlert('No user selected!');
            return;
        }

        for (const selectedUserIp of selectedUserIps) {
            try {
                // Add task to send file to the queue
                const task = {
                    ip: selectedUserIp,          // Destination IP for the file
                    path: pathToFile,            // File path
                    userName: user_info.name     // Sender's username from userConfig
                };
                await window.electronAPI.addTaskToSendFileQueue(task);
                await window.electronAPI.showAlert('File sent to the queue.');
                console.log(`Task added to send file to IP ${selectedUserIp}`);
            } catch (error) {
                console.error(`Error processing IP ${selectedUserIp}:`, error);
            }
        }
    });
    backButton.addEventListener('click', function (event) {
        event.preventDefault();
        fadeOut('main_menu');
    });

    setInterval(fetchUsersAndCreateCheckboxes, 5000);
});

// Function to update the file name display
function updateFileName() {
    const fileNameElement = document.getElementById('selectFile');
    if (!fileNameElement) {
        return;
    }

    if (pathToFile.trim() === '') {
        fileNameElement.textContent = 'No file chosen';
    } else {
        fileNameElement.textContent = pathToFile.split('\\').pop().split('/').pop();
    }
}

async function fetchUsersAndCreateCheckboxes() {
    // Step 1: Get the currently checked users before refreshing the list
    const selectedUserIps = new Set(
        Array.from(document.querySelectorAll('input[name="users"]:checked'))
            .map(checkbox => checkbox.value)
    );

    const usersInfoId = await window.electronAPI.readApplicationInfo('active_users_info');
    if (!usersInfoId) {
        await window.electronAPI.showAlert('Internal error.');
        return;
    }

    const usersInfo = await window.electronAPI.readMemoryEntry(usersInfoId);
    if (!usersInfo || usersInfo.length === 0) {
        await window.electronAPI.showAlert('No active users found.');
        clearInterval(fetchUsersInterval);
        fetchUsersInterval = null;
        await window.electronAPI.changeContent('main_menu');
        return;
    }

    const usersDiv = document.getElementById('choose_user_form_content');
    usersDiv.innerHTML = ''; // Clear the list before updating

    usersInfo.forEach(user => {
        const checkbox = document.createElement('input');
        checkbox.type = 'checkbox';
        checkbox.name = 'users';
        checkbox.value = user.ip; // Store user's IP in the value

        // Step 2: Check if this user was previously selected
        if (selectedUserIps.has(user.ip)) {
            checkbox.checked = true;  // Restore checked state
        }

        const label = document.createElement('label');
        label.innerHTML = `${user.user_info.name}`; // Display user's name
        label.insertBefore(checkbox, label.firstChild);

        usersDiv.appendChild(label);
    });

    toggleScroll('choose_user_form_content');
}