// Smooth transitions and audio player enhancements
document.addEventListener('DOMContentLoaded', () => {
    const cards = document.querySelectorAll('.episode-card');
    
    // Find project root from script src
    const scripts = document.getElementsByTagName('script');
    let projectRoot = '';
    for(let s of scripts) {
        if(s.src.includes('main.js')) {
            projectRoot = s.src.split('/assets/js/main.js')[0];
        }
    }
    if (!projectRoot) projectRoot = window.location.origin;
    
    // Intersection Observer for fade-in effect
    const observerOptions = {
        threshold: 0.1
    };

    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                entry.target.style.opacity = '1';
                entry.target.style.transform = 'translateY(0)';
            }
        });
    }, observerOptions);

    cards.forEach(card => {
        card.style.opacity = '0';
        card.style.transform = 'translateY(20px)';
        card.style.transition = 'all 0.6s cubic-bezier(0.4, 0, 0.2, 1)';
        observer.observe(card);
    });

    // Handle audio player play states and tracking
    const audios = document.querySelectorAll('audio');
    audios.forEach(audio => {
        let startTime = 0;
        let sessionId = null;
        const episodeCard = audio.closest('.episode-card');
        const episodeId = episodeCard ? episodeCard.id.replace('episode-', '') : null;

        const generateSessionId = () => {
            return Date.now() + '-' + Math.random().toString(36).substr(2, 9);
        };

        audio.addEventListener('play', () => {
            if (!sessionId) sessionId = generateSessionId();
            startTime = Date.now();
            // Pause other players
            audios.forEach(otherAudio => {
                if (otherAudio !== audio) {
                    otherAudio.pause();
                }
            });
        });

        const logPlay = (isHeartbeat = false) => {
            if (!episodeId || startTime === 0) return;
            const duration = Math.round((Date.now() - startTime) / 1000);
            if (duration < 1 && !isHeartbeat) {
                console.log('Skipping log: duration too short', duration);
                return;
            }

            console.log(`Tracking play for episode ${episodeId}: ${duration}s (Session: ${sessionId}, Heartbeat: ${isHeartbeat})`);

            fetch(projectRoot + '/includes/track_play.php', {
                method: 'POST',
                headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
                body: `episode_id=${episodeId}&duration=${duration}&session_id=${sessionId}`
            }).then(response => response.json())
              .then(data => console.log('Tracking response:', data))
              .catch(err => console.error('Tracking fetch error:', err));

            
            if (!isHeartbeat) startTime = 0; // Reset after logging
            else startTime = Date.now(); // Reset for next heartbeat
        };

        // Log when paused or finished
        audio.addEventListener('pause', () => logPlay());
        audio.addEventListener('ended', () => logPlay());

        // Heartbeat every 30 seconds
        setInterval(() => {
            if (!audio.paused) logPlay(true);
        }, 30000);
    });

    // --- Push Notifications Logic ---
    const notifyBtn = document.getElementById('notify-btn');
    if (notifyBtn) {
        if (Notification.permission === 'granted') {
            notifyBtn.classList.add('active');
            notifyBtn.textContent = '🔔 Notifications On';
        }

        notifyBtn.addEventListener('click', async () => {
            console.log('Notify button clicked');
            
            if (!('Notification' in window)) {
                alert('This browser does not support desktop notifications.');
                return;
            }

            if (window.location.protocol !== 'https:' && window.location.hostname !== 'localhost') {
                alert('Notifications require a secure connection (HTTPS). Please ensure your site has an SSL certificate.');
                return;
            }

            try {
                const permission = await Notification.requestPermission();
                console.log('Permission status:', permission);
                
                if (permission === 'granted') {
                    notifyBtn.classList.add('active');
                    notifyBtn.textContent = '🔔 Notifications On';
                    
                    new Notification('Notifications Enabled!', {
                        body: 'You will now receive updates from our podcast.',
                        icon: projectRoot + '/favicon.ico'
                    });

                    if ('serviceWorker' in navigator) {
                        navigator.serviceWorker.register(projectRoot + '/sw.js')
                            .then(async reg => {
                                console.log('SW Registered');
                                try {
                                    const subscription = await reg.pushManager.subscribe({
                                        userVisibleOnly: true,
                                        // Note: In a real app, you'd generate VAPID keys.
                                        // For now, we use a placeholder or skip if browser allows.
                                        applicationServerKey: 'BM-YOUR-PUBLIC-VAPID-KEY-HERE' 
                                    });

                                    await fetch(projectRoot + '/includes/subscribe_push.php', {
                                        method: 'POST',
                                        headers: { 'Content-Type': 'application/json' },
                                        body: JSON.stringify(subscription)
                                    });
                                    console.log('Subscription saved to server');
                                } catch (e) {
                                    console.warn('Push subscription failed:', e);
                                }
                            })
                            .catch(err => console.error('SW Error:', err));
                    }
                } else if (permission === 'denied') {
                    alert('Notifications were denied. Please enable them in your browser settings if you wish to receive updates.');
                }
            } catch (err) {
                console.error('Error requesting notification permission:', err);
                alert('An error occurred while requesting permission. Check the console for details.');
            }
        });
    }
});

/**
 * Copy text to clipboard with UI feedback
 */
function copyToClipboard(text, btnId) {
    const btn = document.getElementById(btnId);
    navigator.clipboard.writeText(text).then(() => {
        if (btn) {
            btn.classList.add('copy-success');
            const originalHtml = btn.innerHTML;
            btn.innerHTML = '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>';
            
            setTimeout(() => {
                btn.classList.remove('copy-success');
                btn.innerHTML = originalHtml;
            }, 2000);
        }
    });
}