// Shared live status polling functionality

class LiveStatusUpdater {
  constructor() {
    this.currentlyLive = false;
    this.currentStreamUrl = '';
    this.pollInterval = null;
    this.apiUrl = 'https://api.rockvilletollandsda.church/api/v1/stream/status';
    this.hls = null;
  }

  // Initialize for home page live banner
  initHomePage() {
    const liveBanner = document.getElementById('live-status-banner');
    if (!liveBanner) return;

    this.currentlyLive = liveBanner.style.display !== 'none';
    this.startPolling(() => this.updateHomeBanner(liveBanner));
  }

  // Initialize for live page video player
  initLivePage() {
    const videoContainer = document.querySelector('.aspect-video');
    if (!videoContainer) return;

    const hasVideo = videoContainer.querySelector('video') !== null;
    this.currentlyLive = hasVideo;
    this.currentStreamUrl = hasVideo ? videoContainer.querySelector('video')?.src || '' : '';
    this.startPolling(() => this.updateLivePage(videoContainer));
  }

  startPolling(updateCallback) {
    // Check immediately on load
    this.checkStatus(updateCallback);
    
    // Then check every 30 seconds
    this.pollInterval = setInterval(() => {
      this.checkStatus(updateCallback);
    }, 30000);
  }

  async checkStatus(updateCallback) {
    try {
      console.log('Checking live status...');
      const response = await fetch(this.apiUrl);
      const data = await response.json();
      console.log('API response:', data);
      console.log('Current state:', { currentlyLive: this.currentlyLive, currentStreamUrl: this.currentStreamUrl });
      
      // Only update if status changed
      if (data.is_live !== this.currentlyLive || data.stream_url !== this.currentStreamUrl) {
        console.log('Status changed! Updating UI...');
        this.currentlyLive = data.is_live;
        this.currentStreamUrl = data.stream_url || '';
        updateCallback(data);
      } else {
        console.log('No status change detected');
      }
    } catch (error) {
      console.error('Failed to update live status:', error);
    }
  }

  updateHomeBanner(liveBanner) {
    if (this.currentlyLive) {
      liveBanner.style.display = 'block';
    } else {
      liveBanner.style.display = 'none';
    }
  }

  // Helper method to detect if browser supports native HLS
  supportsNativeHLS() {
    const video = document.createElement('video');
    return video.canPlayType('application/vnd.apple.mpegurl') !== '';
  }

  // Helper method to clean up existing HLS instance
  destroyHLS() {
    if (this.hls) {
      this.hls.destroy();
      this.hls = null;
    }
  }

  // Helper method to setup HLS.js for non-Safari browsers
  setupHLS(video, streamUrl) {
    // Clean up any existing HLS instance
    this.destroyHLS();

    if (this.supportsNativeHLS()) {
      // Safari - use native HLS support
      video.src = streamUrl;
    } else if (window.Hls && window.Hls.isSupported()) {
      // Chrome, Firefox - use HLS.js
      this.hls = new window.Hls({
        enableWorker: true,
        lowLatencyMode: true,
        backBufferLength: 90
      });
      
      this.hls.loadSource(streamUrl);
      this.hls.attachMedia(video);
      
      this.hls.on(window.Hls.Events.MANIFEST_PARSED, () => {
        console.log('HLS manifest parsed, starting playback');
        video.play().catch(e => console.log('Auto-play prevented:', e));
      });

      this.hls.on(window.Hls.Events.ERROR, (event, data) => {
        console.error('HLS error:', event, data);
        if (data.fatal) {
          switch (data.type) {
            case window.Hls.ErrorTypes.NETWORK_ERROR:
              console.log('Network error, trying to recover...');
              this.hls.startLoad();
              break;
            case window.Hls.ErrorTypes.MEDIA_ERROR:
              console.log('Media error, trying to recover...');
              this.hls.recoverMediaError();
              break;
            default:
              console.log('Fatal error, destroying HLS instance');
              this.destroyHLS();
              break;
          }
        }
      });
    } else {
      // Fallback for browsers that don't support HLS at all
      console.warn('HLS not supported in this browser');
      video.src = streamUrl;
    }
  }

  updateLivePage(videoContainer) {
    // Update hero section status indicator
    const heroStatusContainer = document.getElementById('live-status-hero');
    console.log('Hero status container found:', heroStatusContainer);
    if (heroStatusContainer) {
      if (this.currentlyLive) {
        heroStatusContainer.innerHTML = `
          <div class="flex items-center space-x-2 bg-red-500 rounded-full px-4 py-2">
            <div class="w-3 h-3 bg-white rounded-full animate-ping"></div>
            <span class="font-semibold">LIVE NOW</span>
          </div>
        `;
      } else {
        heroStatusContainer.innerHTML = `
          <div class="flex items-center space-x-2 bg-white/20 rounded-full px-4 py-2">
            <div class="w-3 h-3 bg-gray-300 rounded-full"></div>
            <span class="font-semibold">OFFLINE</span>
          </div>
        `;
      }
    }

    // Update video player
    if (this.currentlyLive && this.currentStreamUrl) {
      // Create/update video element
      videoContainer.innerHTML = `
        <video 
          id="live-video-player"
          class="w-full h-full"
          controls
          muted
          playsinline
          preload="none">
          <p class="text-white text-center">Your browser does not support the video tag or HLS streaming.</p>
        </video>
      `;

      // Setup HLS for the new video element
      const video = document.getElementById('live-video-player');
      if (video) {
        this.setupHLS(video, this.currentStreamUrl);
      }
    } else {
      // Clean up HLS when going offline
      this.destroyHLS();
      
      // Show offline message
      videoContainer.innerHTML = `
        <div class="w-full h-full flex items-center justify-center bg-gray-900 text-white">
          <div class="text-center">
            <div class="w-16 h-16 mx-auto mb-4 text-gray-400">
              <svg fill="currentColor" viewBox="0 0 24 24">
                <path d="M21 6.5l-4 4V7c0-0.55-0.45-1-1-1H9.82L21 17.18V6.5zM3.27 2L2 3.27 4.73 6H4c-0.55 0-1 0.45-1 1v10c0 0.55 0.45 1 1 1h12c0.21 0 0.39-0.08 0.54-0.18L19.73 21 21 19.73 3.27 2z"/>
              </svg>
            </div>
            <h3 class="text-2xl font-semibold mb-2">Stream is Offline</h3>
            <p class="text-gray-400">We'll be back for our next service</p>
          </div>
        </div>
      `;
    }
  }

  destroy() {
    if (this.pollInterval) {
      clearInterval(this.pollInterval);
      this.pollInterval = null;
    }
    this.destroyHLS();
  }
}

// Global instance
window.liveStatusUpdater = new LiveStatusUpdater();