// MusicRoom - Queue module
// Queue rendering and library display

(function() {
  const M = window.MusicRoom;
  
  // Update cache status for all tracks
  M.updateCacheStatus = async function() {
    const cached = await TrackStorage.list();
    
    // Migration: remove old filename-based cache entries (keep only sha256: prefixed)
    const oldEntries = cached.filter(id => !id.startsWith("sha256:"));
    if (oldEntries.length > 0) {
      console.log("[Cache] Migrating: removing", oldEntries.length, "old filename-based entries");
      for (const oldId of oldEntries) {
        await TrackStorage.remove(oldId);
      }
      // Re-fetch after cleanup
      const updated = await TrackStorage.list();
      M.cachedTracks = new Set(updated);
    } else {
      M.cachedTracks = new Set(cached);
    }
    console.log("[Cache] Updated cache status:", M.cachedTracks.size, "tracks cached");
  };
  
  // Debug: log cache status for current track
  M.debugCacheStatus = function() {
    if (!M.currentTrackId) {
      console.log("[Cache Debug] No current track");
      return;
    }
    const trackCache = M.getTrackCache(M.currentTrackId);
    const segmentsPct = Math.round((trackCache.size / M.SEGMENTS) * 100);
    const inCachedTracks = M.cachedTracks.has(M.currentTrackId);
    const hasBlobUrl = M.trackBlobs.has(M.currentTrackId);
    const bulkStarted = M.bulkDownloadStarted.get(M.currentTrackId);
    
    console.log("[Cache Debug]", {
      trackId: M.currentTrackId.slice(0, 16) + "...",
      segments: `${trackCache.size}/${M.SEGMENTS} (${segmentsPct}%)`,
      inCachedTracks,
      hasBlobUrl,
      bulkStarted,
      loadingSegments: [...M.loadingSegments],
      cachedTracksSize: M.cachedTracks.size
    });
  };
  
  // Debug: compare queue track IDs with cached track IDs
  M.debugCacheMismatch = function() {
    console.log("[Cache Mismatch Debug]");
    console.log("=== Raw State ===");
    console.log("M.cachedTracks:", M.cachedTracks);
    console.log("M.trackCaches:", M.trackCaches);
    console.log("M.trackBlobs keys:", [...M.trackBlobs.keys()]);
    console.log("M.bulkDownloadStarted:", M.bulkDownloadStarted);
    console.log("=== Queue Tracks ===");
    M.queue.forEach((t, i) => {
      const id = t.id || t.filename;
      console.log(`  [${i}] ${t.title?.slice(0, 30)} | id: ${id?.slice(0, 12)}... | cached: ${M.cachedTracks.has(id)}`);
    });
    console.log("=== Cached Track IDs ===");
    [...M.cachedTracks].forEach(id => {
      console.log(`  ${id.slice(0, 20)}...`);
    });
  };
  
  // Debug: detailed info for a specific track
  M.debugTrack = function(index) {
    const track = M.queue[index];
    if (!track) {
      console.log("[Debug] No track at index", index);
      return;
    }
    const id = track.id || track.filename;
    console.log("[Debug Track]", {
      index,
      title: track.title,
      id,
      idPrefix: id?.slice(0, 16),
      inCachedTracks: M.cachedTracks.has(id),
      inTrackCaches: M.trackCaches.has(id),
      segmentCount: M.trackCaches.get(id)?.size || 0,
      inTrackBlobs: M.trackBlobs.has(id),
      bulkStarted: M.bulkDownloadStarted.get(id)
    });
  };
  
  // Clear all caches (for debugging)
  M.clearAllCaches = async function() {
    await TrackStorage.clear();
    M.cachedTracks.clear();
    M.trackCaches.clear();
    M.trackBlobs.clear();
    M.bulkDownloadStarted.clear();
    M.renderQueue();
    M.renderLibrary();
    console.log("[Cache] All caches cleared. Refresh the page.");
  };
  
  // Render the current queue
  M.renderQueue = function() {
    const container = M.$("#queue");
    if (!container) return;
    container.innerHTML = "";
    if (M.queue.length === 0) {
      container.innerHTML = '<div class="empty">Queue empty</div>';
      return;
    }
    
    // Debug: log first few track cache statuses
    if (M.queue.length > 0 && M.cachedTracks.size > 0) {
      const sample = M.queue.slice(0, 3).map(t => {
        const id = t.id || t.filename;
        return { title: t.title?.slice(0, 20), id: id?.slice(0, 12), cached: M.cachedTracks.has(id) };
      });
      console.log("[Queue Render] Sample tracks:", sample, "| cachedTracks sample:", [...M.cachedTracks].slice(0, 3).map(s => s.slice(0, 12)));
    }
    
    M.queue.forEach((track, i) => {
      const div = document.createElement("div");
      const trackId = track.id || track.filename;
      const isCached = M.cachedTracks.has(trackId);
      div.className = "track" + (i === M.currentIndex ? " active" : "") + (isCached ? " cached" : " not-cached");
      const title = track.title?.trim() || (track.id || track.filename || "Unknown").replace(/\.[^.]+$/, "");
      
      div.innerHTML = `<span class="cache-indicator"></span><span class="track-title">${title}</span><span class="track-actions"><span class="duration">${M.fmt(track.duration)}</span></span>`;
      
      div.querySelector(".track-title").onclick = async () => {
        if (M.synced && M.currentChannelId) {
          const res = await fetch("/api/channels/" + M.currentChannelId + "/jump", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ index: i })
          });
          if (res.status === 403) M.flashPermissionDenied();
          if (res.status === 400) console.warn("Jump failed: 400 - index:", i, "queue length:", M.queue.length);
        } else {
          M.currentIndex = i;
          M.currentTrackId = trackId;
          M.serverTrackDuration = track.duration;
          M.$("#track-title").textContent = title;
          M.loadingSegments.clear();
          const cachedUrl = await M.loadTrackBlob(trackId);
          M.audio.src = cachedUrl || M.getTrackUrl(trackId);
          M.audio.currentTime = 0;
          M.localTimestamp = 0;
          M.audio.play();
          M.renderQueue();
        }
      };
      
      container.appendChild(div);
    });
  };
  
  // Render the library
  M.renderLibrary = function() {
    const container = M.$("#library");
    if (!container) return;
    container.innerHTML = "";
    if (M.library.length === 0) {
      container.innerHTML = '<div class="empty">No tracks discovered</div>';
      return;
    }
    M.library.forEach((track) => {
      const div = document.createElement("div");
      const isCached = M.cachedTracks.has(track.id);
      div.className = "track" + (isCached ? " cached" : " not-cached");
      const title = track.title?.trim() || track.filename.replace(/\.[^.]+$/, "");
      div.innerHTML = `<span class="cache-indicator"></span><span class="track-title">${title}</span><span class="track-actions"><span class="duration">${M.fmt(track.duration)}</span></span>`;
      
      div.querySelector(".track-title").onclick = async () => {
        // Play directly from library (uses track ID) - only in local mode
        if (!M.synced) {
          M.currentTrackId = track.id;
          M.serverTrackDuration = track.duration;
          M.$("#track-title").textContent = title;
          M.loadingSegments.clear();
          const cachedUrl = await M.loadTrackBlob(track.id);
          M.audio.src = cachedUrl || M.getTrackUrl(track.id);
          M.audio.currentTime = 0;
          M.localTimestamp = 0;
          M.audio.play();
        }
      };
      
      container.appendChild(div);
    });
  };
  
  // Load library from server
  M.loadLibrary = async function() {
    try {
      const res = await fetch("/api/library");
      M.library = await res.json();
      M.renderLibrary();
    } catch (e) {
      console.warn("Failed to load library");
    }
  };
})();