const socket = io();

// UI Elements
const statusBadge = document.getElementById('status-badge');
const qrContainer = document.getElementById('qr-container');
const activityLog = document.getElementById('activity-log');
const groupsTableBody = document.getElementById('groups-table-body');
const appsTableBody = document.getElementById('apps-table-body');
const inviteModal = document.getElementById('invite-modal');
const inviteLinkInput = document.getElementById('invite-link-input');

// Tab Switching
document.querySelectorAll('.nav-btn').forEach(btn => {
    btn.addEventListener('click', (e) => {
        document.querySelectorAll('.nav-btn').forEach(b => b.classList.remove('active'));
        document.querySelectorAll('.tab-pane').forEach(p => p.classList.remove('active'));
        
        e.target.classList.add('active');
        document.getElementById(e.target.dataset.tab).classList.add('active');
        
        if (e.target.dataset.tab === 'groups') {
            fetchGroups();
        }
        if (e.target.dataset.tab === 'apps') {
            fetchApps();
        }
    });
});

// Logging
function logActivity(msg, type = 'info') {
    const entry = document.createElement('p');
    entry.className = `log-entry ${type}`;
    const time = new Date().toLocaleTimeString();
    entry.textContent = `[${time}] ${msg}`;
    activityLog.prepend(entry);
}

// Socket Events
socket.on('status', (data) => {
    updateStatus(data.ready);
    if (data.qr && !data.ready) renderQR(data.qr);
});

socket.on('qr', (qr) => {
    renderQR(qr);
    logActivity('New QR code generated', 'system');
});

socket.on('ready', () => {
    updateStatus(true);
    qrContainer.innerHTML = '<h3>✅ Connected</h3><p>Session is active and authenticated.</p>';
    logActivity('Client successfully authenticated and ready', 'success');
});

socket.on('disconnected', (reason) => {
    updateStatus(false);
    logActivity(`Disconnected: ${reason}`, 'error');
});

socket.on('incoming_message', (msg) => {
    logActivity(`Msg from ${msg.from}: ${msg.body.substring(0, 50)}...`, 'info');
});

function updateStatus(isReady) {
    if (isReady) {
        statusBadge.textContent = 'Connected';
        statusBadge.className = 'badge success';
    } else {
        statusBadge.textContent = 'Disconnected';
        statusBadge.className = 'badge error';
    }
}

function renderQR(qrText) {
    qrContainer.innerHTML = '';
    const qr = qrcode(0, 'L');
    qr.addData(qrText);
    qr.make();
    qrContainer.innerHTML = qr.createImgTag(5);
}

// Groups Tab functionality
async function fetchGroups() {
    groupsTableBody.innerHTML = '<tr><td colspan="3" class="text-center">Loading...</td></tr>';
    try {
        const res = await fetch('api/groups');
        const data = await res.json();
        
        if (!data.success) {
            groupsTableBody.innerHTML = `<tr><td colspan="3" class="text-center">Error: ${data.error || 'Not connected'}</td></tr>`;
            return;
        }

        if (data.groups.length === 0) {
            groupsTableBody.innerHTML = '<tr><td colspan="3" class="text-center">No groups found.</td></tr>';
            return;
        }

        groupsTableBody.innerHTML = '';
        data.groups.forEach(g => {
            const tr = document.createElement('tr');
            tr.innerHTML = `
                <td><strong>${g.name}</strong><br><small style="color:var(--text-muted)">${g.id}</small></td>
                <td>${g.participants}</td>
                <td>
                    <button class="secondary-btn" onclick="getInviteLink('${g.id}')">Get Invite Link</button>
                </td>
            `;
            groupsTableBody.appendChild(tr);
        });

    } catch (e) {
        groupsTableBody.innerHTML = `<tr><td colspan="3" class="text-center">Fetch failed.</td></tr>`;
    }
}

document.getElementById('btn-refresh-groups').addEventListener('click', fetchGroups);

// Connected Apps functionality
async function fetchApps() {
    appsTableBody.innerHTML = '<tr><td colspan="4" class="text-center">Loading...</td></tr>';
    try {
        const res = await fetch('api/apps');
        const data = await res.json();
        
        if (!data.success) {
            appsTableBody.innerHTML = `<tr><td colspan="4" class="text-center">Error fetching apps</td></tr>`;
            return;
        }

        if (data.apps.length === 0) {
            appsTableBody.innerHTML = '<tr><td colspan="4" class="text-center">No apps connected yet. Send a message to see an app appear here!</td></tr>';
            return;
        }

        appsTableBody.innerHTML = '';
        data.apps.sort((a, b) => new Date(b.lastSeen) - new Date(a.lastSeen)).forEach(app => {
            const tr = document.createElement('tr');
            tr.innerHTML = `
                <td><strong>${app.name}</strong></td>
                <td>${app.messageCount}</td>
                <td>${new Date(app.lastSeen).toLocaleString()}</td>
                <td><small style="color:var(--text-muted)">${app.lastIp}</small></td>
            `;
            appsTableBody.appendChild(tr);
        });

    } catch (e) {
        appsTableBody.innerHTML = `<tr><td colspan="4" class="text-center">Fetch failed.</td></tr>`;
    }
}

document.getElementById('btn-refresh-apps').addEventListener('click', fetchApps);

// Create Group
document.getElementById('create-group-form').addEventListener('submit', async (e) => {
    e.preventDefault();
    const btn = e.target.querySelector('button');
    btn.textContent = 'Creating...';
    btn.disabled = true;

    const title = document.getElementById('new-group-name').value;
    const participant = document.getElementById('new-group-participant').value;

    try {
        const res = await fetch('api/groups/create', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ title, initialParticipants: [participant] })
        });
        const data = await res.json();
        
        if (data.success) {
            alert('Group created successfully! ID: ' + data.groupId);
            fetchGroups();
            e.target.reset();
        } else {
            alert('Error: ' + data.error);
        }
    } catch (err) {
        alert('Failed to create group.');
    } finally {
        btn.textContent = 'Create Group';
        btn.disabled = false;
    }
});

// Invite Link Modal
window.getInviteLink = async (groupId) => {
    try {
        const res = await fetch('api/groups/invite', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ groupId })
        });
        const data = await res.json();
        if (data.success) {
            inviteLinkInput.value = data.inviteLink;
            inviteModal.classList.add('active');
        } else {
            alert('Failed to get invite link: ' + data.error);
        }
    } catch (err) {
        alert('Request failed.');
    }
};

document.querySelector('.close-modal').addEventListener('click', () => {
    inviteModal.classList.remove('active');
});

document.getElementById('btn-copy-link').addEventListener('click', () => {
    inviteLinkInput.select();
    document.execCommand('copy');
    alert('Copied to clipboard!');
});

// Test Message
document.getElementById('test-msg-form').addEventListener('submit', async (e) => {
    e.preventDefault();
    const btn = e.target.querySelector('button');
    const resultDiv = document.getElementById('test-result');
    
    btn.textContent = 'Sending...';
    btn.disabled = true;
    resultDiv.textContent = '';

    const to = document.getElementById('test-to').value;
    const message = document.getElementById('test-body').value;

    try {
        const res = await fetch('api/send-message', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ to, message })
        });
        const data = await res.json();
        
        if (data.success) {
            resultDiv.innerHTML = `<span style="color:var(--success)">✅ Sent successfully (ID: ${data.messageId})</span>`;
            document.getElementById('test-body').value = '';
        } else {
            resultDiv.innerHTML = `<span style="color:var(--error)">❌ ${data.error}</span>`;
        }
    } catch (err) {
        resultDiv.innerHTML = `<span style="color:var(--error)">❌ Request failed.</span>`;
    } finally {
        btn.textContent = 'Send Message';
        btn.disabled = false;
    }
});