// NextNVR v0.1.0 — Single Page Application
// Tabbed UI: Live Wall (4×2 grid + focus), Playback browser, Settings/Onboarding

const API = '/api';

// ── App State ──
let cameras = [];
let config = null;

// ── Init ──
document.addEventListener('DOMContentLoaded', async () => {
    setupTabs();
    await loadStatus();
    await loadCameras();
    renderLiveGrid();
    renderPlaybackCameras();
    renderCameraCards();

    // First-run experience: auto-switch to Settings if no cameras configured.
    if (cameras.length === 0) {
        switchTab('settings');
    }
});

// ── Tabs ──
function setupTabs() {
    document.querySelectorAll('.tab').forEach(btn => {
        btn.addEventListener('click', () => {
            switchTab(btn.dataset.tab);
        });
    });
}
function switchTab(tabName) {
    document.querySelectorAll('.tab').forEach(b => b.classList.remove('active'));
    document.querySelectorAll('.tab-panel').forEach(p => p.classList.remove('active'));
    const tabBtn = document.querySelector(`.tab[data-tab="${tabName}"]`);
    if (tabBtn) tabBtn.classList.add('active');
    const panel = document.getElementById('tab-' + tabName);
    if (panel) panel.classList.add('active');
}

// ── Status ──
async function loadStatus() {
    try {
        const r = await fetch(API + '/status');
        const j = await r.json();
        const dot = document.getElementById('status-dot');
        dot.className = 'status ' + (j.success ? 'online' : 'offline');
    } catch(e) {
        document.getElementById('status-dot').className = 'status offline';
    }
}

// ── Cameras ──
async function loadCameras() {
    try {
        const r = await fetch(API + '/cameras');
        const j = await r.json();
        if (j.success) cameras = j.data;
    } catch(e) { cameras = []; }
}

// ── Live Grid ──
function renderLiveGrid() {
    const grid = document.getElementById('grid');
    grid.innerHTML = '';
    for (let i = 0; i < 8; i++) {
        const cam = cameras[i];
        const tile = document.createElement('div');
        tile.className = 'grid-tile' + (cam && cam.enabled ? '' : ' offline');
        tile.dataset.camId = cam ? cam.id : '';

        if (cam) {
            tile.innerHTML = `
                <span class="tile-status ${cam.online ? 'online' : 'offline'}"></span>
                <span class="tile-label">${cam.name}</span>
            `;
            tile.addEventListener('click', () => openFocus(cam));
        } else {
            tile.innerHTML = '<span class="tile-placeholder">No Camera</span>';
        }
        grid.appendChild(tile);
    }
}

// ── Focus Overlay ──
let focusIdx = -1;
function openFocus(cam) {
    focusIdx = cameras.indexOf(cam);
    const overlay = document.getElementById('focus-overlay');
    overlay.classList.remove('hidden');
    updateFocus();
    renderThumbs();
}
function updateFocus() {
    if (focusIdx < 0 || focusIdx >= cameras.length) return;
    const cam = cameras[focusIdx];
    document.getElementById('focus-title').textContent = cam.name;
    document.getElementById('focus-time').textContent = new Date().toLocaleTimeString() + ' live';
    // TODO: M3 — connect to go2rtc WebRTC stream
    const vid = document.getElementById('focus-video');
    vid.src = '';
    vid.poster = ''; // placeholder until go2rtc is wired up
}
function renderThumbs() {
    const strip = document.getElementById('focus-thumbs');
    strip.innerHTML = '';
    cameras.forEach((cam, i) => {
        const thumb = document.createElement('div');
        thumb.className = 'thumb' + (i === focusIdx ? ' active' : '');
        thumb.textContent = cam.name;
        thumb.title = cam.name;
        thumb.addEventListener('click', () => { focusIdx = i; updateFocus(); renderThumbs(); });
        strip.appendChild(thumb);
    });
}
document.getElementById('focus-close').addEventListener('click', () => {
    document.getElementById('focus-overlay').classList.add('hidden');
});
document.getElementById('focus-prev').addEventListener('click', () => {
    if (focusIdx > 0) { focusIdx--; updateFocus(); renderThumbs(); }
});
document.getElementById('focus-next').addEventListener('click', () => {
    if (focusIdx < cameras.length - 1) { focusIdx++; updateFocus(); renderThumbs(); }
});
document.addEventListener('keydown', e => {
    if (document.getElementById('focus-overlay').classList.contains('hidden')) return;
    if (e.key === 'Escape') document.getElementById('focus-overlay').classList.add('hidden');
    if (e.key === 'ArrowLeft' && focusIdx > 0) { focusIdx--; updateFocus(); renderThumbs(); }
    if (e.key === 'ArrowRight' && focusIdx < cameras.length - 1) { focusIdx++; updateFocus(); renderThumbs(); }
});

// ── Playback ──
let activePreset = 'today';
function renderPlaybackCameras() {
    const sel = document.getElementById('pb-camera');
    sel.innerHTML = '<option value="">— Select Camera —</option>';
    cameras.forEach(c => {
        sel.innerHTML += `<option value="${c.id}">${c.name}</option>`;
    });
}

// Preset buttons.
document.querySelectorAll('.preset').forEach(btn => {
    btn.addEventListener('click', () => {
        document.querySelectorAll('.preset').forEach(b => b.classList.remove('active'));
        btn.classList.add('active');
        activePreset = btn.dataset.preset;
        const customRange = document.getElementById('pb-custom-range');
        if (activePreset === 'custom') {
            customRange.classList.remove('hidden');
        } else {
            customRange.classList.add('hidden');
            loadClips(); // auto-load on preset change
        }
    });
});

document.getElementById('pb-load').addEventListener('click', loadClips);

async function loadClips() {
    const cam = document.getElementById('pb-camera').value;
    if (!cam) return;
    let url = API + '/recordings?cam=' + cam + '&preset=' + activePreset;
    if (activePreset === 'custom') {
        const from = document.getElementById('pb-from').value;
        const to = document.getElementById('pb-to').value;
        if (from) url += '&from=' + from;
        if (to) url += '&to=' + to;
    }
    try {
        const r = await fetch(url);
        const j = await r.json();
        renderClips(j.data || []);
    } catch(e) { renderClips([]); }
}
function renderClips(clips) {
    const grid = document.getElementById('pb-clips');
    if (clips.length === 0) { grid.innerHTML = '<p style="color:var(--text-muted);grid-column:1/-1">No recordings found for this selection.</p>'; return; }
    grid.innerHTML = clips.map(c => `
        <div class="clip-card" onclick="playClip('${c.path}')">
            <div>${c.live ? '🔴 ' : '🎬 '}${c.time}</div>
            <div class="clip-time">${c.name}</div>
            <div class="clip-size">${formatSize(c.size)}</div>
        </div>
    `).join('');
}
function playClip(path) {
    document.getElementById('pb-player').classList.remove('hidden');
    document.getElementById('pb-video').src = '/recordings/' + path;
}
document.getElementById('pb-close').addEventListener('click', () => {
    document.getElementById('pb-player').classList.add('hidden');
    document.getElementById('pb-video').src = '';
});

// ── Settings / Onboarding ──
async function renderCameraCards() {
    const container = document.getElementById('camera-cards');
    if (cameras.length === 0) {
        container.innerHTML = `
            <div style="grid-column:1/-1;text-align:center;padding:60px 20px;color:var(--text-muted)">
                <p style="font-size:48px;margin-bottom:12px">🎥</p>
                <p style="font-size:20px;font-weight:600;color:var(--text)">Welcome to NextNVR</p>
                <p style="margin-top:8px;max-width:500px;margin-left:auto;margin-right:auto">
                    No cameras configured yet. Enter your camera's IP range and credentials to scan your network.
                </p>
                <div style="margin-top:24px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap">
                    <label style="color:var(--text-muted);font-size:13px">IP Range:
                        <input type="text" id="wiz-from" value="192.168.1.200" style="width:130px;margin:0 4px;padding:6px 8px;background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:4px">
                    </label>
                    <label style="color:var(--text-muted);font-size:13px">to
                        <input type="text" id="wiz-to" value="192.168.1.210" style="width:130px;margin:0 4px;padding:6px 8px;background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:4px">
                    </label>
                </div>
                <div style="margin-top:12px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap">
                    <label style="color:var(--text-muted);font-size:13px">Username:
                        <input type="text" id="wiz-user" value="admin" style="width:120px;margin:0 4px;padding:6px 8px;background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:4px">
                    </label>
                    <label style="color:var(--text-muted);font-size:13px">Password:
                        <input type="password" id="wiz-pass" value="" style="width:120px;margin:0 4px;padding:6px 8px;background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:4px">
                    </label>
                </div>
                <button class="btn-primary" style="margin-top:20px;font-size:16px;padding:10px 32px" onclick="runWizard()">
                    🔍 Scan Network
                </button>
            </div>`;
        return;
    }
    container.innerHTML = cameras.map(c => `
        <div class="camera-card" data-id="${c.id}">
            <h3>📷 ${c.name || 'Unnamed'} <span style="font-size:11px;color:var(--text-muted)">${c.ip}</span></h3>
            <label>Name <input type="text" value="${escAttr(c.name)}" data-field="name"></label>
            <label>Description <textarea data-field="description">${escHtml(c.description)}</textarea></label>
            <label>RTSP Main <input type="text" value="${escAttr(c.rtsp_main)}" data-field="rtsp_main"></label>
            <label>RTSP Sub <input type="text" value="${escAttr(c.rtsp_sub)}" data-field="rtsp_sub"></label>
            <label>Username <input type="text" value="${escAttr(c.username)}" data-field="username"></label>
            <label>Password <input type="password" value="${escAttr(c.password)}" data-field="password"></label>
            <div class="row">
                <label>Enabled <input type="checkbox" ${c.enabled ? 'checked' : ''} data-field="enabled" style="width:auto"></label>
                <label>Record <input type="checkbox" ${c.record ? 'checked' : ''} data-field="record" style="width:auto"></label>
            </div>
        </div>
    `).join('');
}

// ── Settings: Scan ──
async function runWizard() {
    const from = document.getElementById('wiz-from')?.value || '192.168.1.200';
    const to = document.getElementById('wiz-to')?.value || '192.168.1.210';
    const user = document.getElementById('wiz-user')?.value || 'admin';
    const pass = document.getElementById('wiz-pass')?.value || '';
    const status = document.getElementById('settings-status');
    status.textContent = '⏳ Scanning ' + from + ' to ' + to + '...';

    try {
        const r = await fetch(API + '/scan', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ method: 'range', from, to, username: user, password: pass })
        });
        const j = await r.json();
        if (j.success) {
            const found = j.data.filter(d => d.reachable);
            status.textContent = 'Found ' + found.length + ' cameras.';
            if (found.length > 0) {
                cameras = found.map(d => ({
                    id: 'cam_' + d.ip.split('.').pop(),
                    name: (d.manufacturer || 'Camera') + ' ' + (d.model || ''),
                    ip: d.ip,
                    username: user,
                    password: pass,
                    onvif_port: d.onvif_port || 80,
                    rtsp_main: d.rtsp_main || '',
                    rtsp_sub: d.rtsp_sub || '',
                    description: '',
                    enabled: true,
                    record: true,
                    online: d.reachable
                }));
                renderCameraCards();
                renderLiveGrid();
                renderPlaybackCameras();
                status.textContent = '✅ Found ' + found.length + ' cameras. Name them and click Save.';
                status.style.color = 'var(--green)';
            } else {
                status.textContent = '❌ No cameras found in that range.';
                status.style.color = 'var(--red)';
            }
        }
    } catch(e) {
        status.textContent = '❌ Scan failed: ' + e.message;
        status.style.color = 'var(--red)';
    }
}

document.getElementById('btn-scan').addEventListener('click', runWizard);

// ── Settings: Save ──
document.getElementById('btn-save').addEventListener('click', async () => {
    const status = document.getElementById('settings-status');
    // Collect camera data from DOM.
    const cards = document.querySelectorAll('.camera-card');
    const updatedCameras = [];
    cards.forEach(card => {
        const c = {};
        card.querySelectorAll('[data-field]').forEach(el => {
            const field = el.dataset.field;
            if (el.type === 'checkbox') c[field] = el.checked;
            else c[field] = el.value;
        });
        updatedCameras.push(c);
    });

    try {
        // Fetch current config, then post updated version.
        const cr = await fetch(API + '/config');
        const cj = await cr.json();
        const cfg = cj.data || {};
        cfg.cameras = updatedCameras;

        const r = await fetch(API + '/config', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(cfg)
        });
        const j = await r.json();
        if (j.success) {
            // Reload cameras from the server (in-memory config is now updated).
            await loadCameras();
            renderLiveGrid();
            renderPlaybackCameras();
            renderCameraCards();
            status.textContent = '✅ Cameras saved! Switching to Live Wall...';
            status.style.color = 'var(--green)';
            setTimeout(() => switchTab('live'), 800);
        } else {
            status.textContent = '❌ Save failed: ' + j.error;
            status.style.color = 'var(--red)';
        }
    } catch(e) {
        status.textContent = '❌ Error: ' + e.message;
        status.style.color = 'var(--red)';
    }
});

// ── Helpers ──
function escAttr(s) { return (s || '').replace(/&/g,'&amp;').replace(/"/g,'&quot;'); }
function escHtml(s) { return (s || '').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;'); }
function formatSize(bytes) {
    if (!bytes || bytes === 0) return '0 B';
    const u = ['B','KB','MB','GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(1024));
    return (bytes / Math.pow(1024, i)).toFixed(1) + ' ' + u[i];
}