let ws;
const videoPlayer = document.getElementById('videoPlayer');
const videoOverlay = document.getElementById('videoOverlay');
const progressContainer = document.getElementById('progressContainer');
const progressFill = document.getElementById('progressFill');
const timer = document.getElementById('timer');
const loadingSpinner = document.getElementById('loadingSpinner');
const loadingStatusText = document.getElementById('loadingStatusText'); // new element
let backendDuration = null; // Duration provided by backend

console.log('Renderer loaded. DOM elements initialized.');

// Console log passthrough to Electron main
if (window.require) {
    const { ipcRenderer } = window.require('electron');
    ['log', 'error', 'warn', 'info'].forEach(level => {
        const orig = console[level];
        console[level] = function(...args) {
            ipcRenderer.send('ui-log', { level, args });
            orig.apply(console, args);
        };
    });
    console.log('Electron ipcRenderer logging enabled.');
}

// Always muted for security
videoPlayer.muted = true;
console.log('Video player muted.');

function connectWebSocket() {
    console.log('Connecting to WebSocket...');
    ws = new WebSocket('ws://localhost:8001');
    ws.onmessage = (event) => {
        console.log('WebSocket message received:', event.data);
        try {
            const message = JSON.parse(event.data);
            console.log('Parsed message:', message);
            if (message.type === 'play_video') {
                console.log('play_video command received:', message);
                playVideo(
                    message.url,
                    message.location || "center",
                    message.size || 5,
                    message.duration ?? null
                );
            } else if (message.type === 'stop_video') {
                console.log('stop_video command received.');
                stopVideo();
            } else if (message.type === 'status_update') {
                console.log('status_update received:', message.status);
                updateLoadingStatus(message.status);
            }
        } catch (error) {
            showError('Error parsing message from server.');
            console.error('Error parsing message:', error);
        }
    };
    ws.onclose = () => {
        console.warn('WebSocket closed. Retrying...');
        showError('Lost connection to WebSocket server. Retrying...');
        setTimeout(connectWebSocket, 3000);
    };
    ws.onerror = (err) => {
        console.error('WebSocket error:', err);
        showError('WebSocket connection error. Is the server running?');
    };
}

function updateLoadingStatus(status) {
    console.log('Updating loading status:', status);
    if (loadingStatusText) {
        loadingStatusText.textContent = status;
        loadingSpinner.style.display = 'flex';
        videoPlayer.style.display = 'none';
        progressContainer.style.display = 'none';
        videoOverlay.classList.remove('hidden');
    }
}

function playVideo(url, location = "center", size = 5, duration = null) {
    console.log('[UI] playVideo called:', { url, location, size, duration });
    backendDuration = typeof duration === 'number' && duration > 0 ? duration : null;

    videoPlayer.src = url;
    videoOverlay.classList.remove('hidden');
    setOverlayPosition(location, size);

    // Show loading spinner, hide video and progress until ready
    loadingSpinner.style.display = 'flex';
    videoPlayer.style.display = 'none';
    progressContainer.style.display = backendDuration ? 'block' : 'none';

    // Start loading and wait for canplay to avoid black frames
    videoPlayer.load();
    console.log('[UI] Video loading started.');

    const cleanup = () => {
        videoPlayer.removeEventListener('canplay', onCanPlay);
        videoPlayer.removeEventListener('error', onError);
    };

    const onCanPlay = () => {
        console.log('[UI] canplay: starting playback');
        loadingSpinner.style.display = 'none';
        videoPlayer.style.display = '';
        videoPlayer.play().then(() => {
            console.log('[UI] Video playback started.');
        }).catch((err) => {
            console.warn('[UI] Video playback failed:', err);
        });
        updateProgress();
        cleanup();
    };

    const onError = (e) => {
        console.error('[UI] Video error:', e);
        showError(e.message ? e.message.toString() : 'Unknown video error');
        cleanup();
    };

    videoPlayer.addEventListener('canplay', onCanPlay, { once: true });
    videoPlayer.addEventListener('error', onError, { once: true });

    // Safety fallback in case canplay doesn't fire quickly
    setTimeout(() => {
        if (loadingSpinner.style.display !== 'none') {
            console.warn('[UI] Fallback: forcing playback after timeout.');
            onCanPlay();
        }
    }, 2000);
}

function stopVideo() {
    console.log('stopVideo called.');
    hideVideo();
}

function sendStoppedMessage() {
    if (ws && ws.readyState === WebSocket.OPEN) {
        ws.send(JSON.stringify({ type: "stopped" }));
        console.log('Sent "stopped" message to backend.');
    }
}

function hideVideo() {
    console.log('hideVideo called.');
    backendDuration = null; // Clear backend-provided duration
    videoOverlay.classList.add('hidden');
    videoPlayer.pause();
    videoPlayer.src = '';
    videoPlayer.style.width = '100vw';
    videoPlayer.style.height = '100vh';
    progressContainer.style.display = 'none';
    progressFill.style.width = '0%';
    timer.textContent = '';
    loadingSpinner.style.display = 'none';
    videoPlayer.style.display = '';
    sendStoppedMessage(); // Notify backend when video stops
}

// Start WebSocket connection when page loads
console.log('Starting WebSocket connection...');
connectWebSocket();

videoPlayer.addEventListener('ended', () => {
    console.log('Video ended event.');
    hideVideo();
    sendStoppedMessage(); // Notify backend when video ends
});
videoPlayer.addEventListener('timeupdate', () => {
    // This can be noisy, so only log occasionally
    if (Math.floor(videoPlayer.currentTime) % 5 === 0) {
        console.log('Video timeupdate:', videoPlayer.currentTime);
    }
    updateProgress();
});

function updateProgress() {
    let current = 0;
    try {
        current = Number(videoPlayer.currentTime) || 0;
        if (typeof backendDuration === 'number' && backendDuration > 0) {
            const total = backendDuration;
            const percent = Math.min((current / total) * 100, 100);
            progressFill.style.width = percent + '%';
            timer.textContent = formatTime(current) + ' / ' + formatTime(total);
            // Optional: reduce noisy logs
            // console.log(`[UI] Progress: ${percent.toFixed(2)}%`);
        } else {
            // No duration provided; hide progress UI
            progressFill.style.width = '0%';
            timer.textContent = formatTime(current) + ' / --:--';
            progressContainer.style.display = 'none';
        }
    } catch (err) {
        progressFill.style.width = '0%';
        timer.textContent = formatTime(current) + ' / --:--';
        console.error('[UI] Error updating progress:', err);
    }
}

function formatTime(seconds) {
    seconds = Math.floor(seconds);
    const m = Math.floor(seconds / 60);
    const s = seconds % 60;
    return `${m}:${s.toString().padStart(2, '0')}`;
}

function setOverlayPosition(location, size) {
    console.log('setOverlayPosition called:', { location, size });
    // Reset styles
    videoOverlay.style.justifyContent = '';
    videoOverlay.style.alignItems = '';
    videoOverlay.style.top = '';
    videoOverlay.style.left = '';
    videoOverlay.style.right = '';
    videoOverlay.style.bottom = '';
    videoOverlay.style.width = '100vw';
    videoOverlay.style.height = '100vh';

    // Calculate video size as percentage of viewport (10% to 100%)
    const percent = Math.min(Math.max(size, 1), 10) * 10;
    videoPlayer.style.width = percent + 'vw';
    videoPlayer.style.height = percent + 'vh';

    // Position overlay and video
    switch (location) {
        case 'top_left':
            videoOverlay.style.justifyContent = 'flex-start';
            videoOverlay.style.alignItems = 'flex-start';
            break;
        case 'bottom_left':
            videoOverlay.style.justifyContent = 'flex-start';
            videoOverlay.style.alignItems = 'flex-end';
            break;
        case 'top_right':
            videoOverlay.style.justifyContent = 'flex-end';
            videoOverlay.style.alignItems = 'flex-start';
            break;
        case 'center':
        default:
            videoOverlay.style.justifyContent = 'center';
            videoOverlay.style.alignItems = 'center';
            break;
    }
    console.log('Overlay position set.');
}