feat: add NetEase as lyrics fallback after lrclib (Android + web)

Search order: lrclib exact → lrclib fuzzy search → NetEase.
NetEase has strong coverage for Asian/Japanese music that lrclib misses.
Duration-matched candidate selection on all three steps.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/src/main/kotlin/com/novasonic/app/api/LrcLibClient.kt

@@ -21,6 +21,21 @@ data class LrcLibResponse(
     val syncedLyrics: String? = null,
 )
 
+@Serializable
+private data class NetEaseSearchResp(
+    val result: NetEaseResult? = null,
+    val code: Int = 0,
+)
+@Serializable
+private data class NetEaseResult(val songs: List<NetEaseSong> = emptyList())
+@Serializable
+private data class NetEaseSong(val id: Long = 0, val duration: Long = 0)
+
+@Serializable
+private data class NetEaseLyricsResp(val lrc: NetEaseLrc? = null, val code: Int = 0)
+@Serializable
+private data class NetEaseLrc(val lyric: String? = null)
+
 data class LrcLine(val timeMs: Long, val text: String)
 
 fun parseLrc(lrc: String): List<LrcLine> {
@@ -53,7 +68,7 @@ object LrcLibClient {
         album: String?,
         durationSecs: Int?,
     ): LrcLibResponse? {
-        // 1. Exact match — fastest, most accurate when metadata is clean
+        // 1. lrclib exact match
         val exact = runCatching {
             client.get("https://lrclib.net/api/get") {
                 parameter("artist_name", artist)
@@ -64,26 +79,65 @@ object LrcLibClient {
         }.getOrNull()
         if (exact != null) return exact
 
-        // 2. Fuzzy search fallback — handles artist name mismatches (e.g. "Utada" vs "Hikaru Utada")
+        // 2. lrclib fuzzy search — handles artist name mismatches
         val candidates = runCatching {
             client.get("https://lrclib.net/api/search") {
                 parameter("track_name", title)
                 if (artist.isNotBlank()) parameter("artist_name", artist)
             }.body<List<LrcLibResponse>>()
-        }.getOrNull() ?: return null
+        }.getOrNull()
 
-        if (candidates.isEmpty()) return null
-
-        return if (durationSecs != null && durationSecs > 0) {
-            val synced = candidates.filter { !it.syncedLyrics.isNullOrBlank() }
-            val pool   = synced.ifEmpty { candidates }
+        val lrclibResult = candidates?.let { list ->
+            if (list.isEmpty()) return@let null
+            if (durationSecs != null && durationSecs > 0) {
+                val synced = list.filter { !it.syncedLyrics.isNullOrBlank() }
+                val pool   = synced.ifEmpty { list }
                 pool.minByOrNull { kotlin.math.abs(it.duration - durationSecs) }
                     ?.takeIf { kotlin.math.abs(it.duration - durationSecs) <= 5.0 }
                     ?: synced.firstOrNull()
-                ?: candidates.firstOrNull()
+                    ?: list.firstOrNull()
             } else {
-            candidates.firstOrNull { !it.syncedLyrics.isNullOrBlank() }
-                ?: candidates.firstOrNull()
+                list.firstOrNull { !it.syncedLyrics.isNullOrBlank() } ?: list.firstOrNull()
             }
         }
+        if (lrclibResult != null) return lrclibResult
+
+        // 3. NetEase fallback — good coverage for Asian/Japanese music
+        val neLrc = runCatching { netEaseLyrics(artist, title, durationSecs) }.getOrNull()
+        if (!neLrc.isNullOrBlank()) {
+            return LrcLibResponse(syncedLyrics = neLrc)
+        }
+
+        return null
+    }
+
+    private suspend fun netEaseLyrics(artist: String, title: String, durationSecs: Int?): String? {
+        val query = "$artist $title".trim()
+        val search = client.get("https://music.163.com/api/search/get") {
+            parameter("s", query)
+            parameter("type", 1)
+            parameter("limit", 5)
+            header("Referer", "https://music.163.com")
+        }.body<NetEaseSearchResp>()
+
+        val songs = search.result?.songs ?: return null
+        val song = if (durationSecs != null && durationSecs > 0) {
+            val durMs = durationSecs * 1000L
+            songs.minByOrNull { kotlin.math.abs(it.duration - durMs) }
+                ?.takeIf { kotlin.math.abs(it.duration - durMs) <= 5000L }
+                ?: songs.firstOrNull()
+        } else {
+            songs.firstOrNull()
+        } ?: return null
+
+        val lyricsResp = client.get("https://music.163.com/api/song/lyric") {
+            parameter("id", song.id)
+            parameter("lv", 1)
+            parameter("kv", 1)
+            parameter("tv", -1)
+            header("Referer", "https://music.163.com")
+        }.body<NetEaseLyricsResp>()
+
+        return lyricsResp.lrc?.lyric?.takeIf { it.isNotBlank() }
+    }
 }

src/player/nowplaying.js

@@ -183,6 +183,39 @@ async function _loadNpLyrics(songId) {
     } catch {}
   }
 
+  // 3. NetEase fallback — good coverage for Asian/Japanese music
+  if(token !== _lyricsLoadToken) return;
+  if(!result?.syncedLyrics && !result?.plainLyrics) {
+    try {
+      const q   = encodeURIComponent(`${artist} ${title}`.trim());
+      const sr  = await fetch(`https://music.163.com/api/search/get?s=${q}&type=1&limit=5`, {
+        headers: { Referer: 'https://music.163.com' },
+        signal: AbortSignal.timeout(8000),
+      });
+      if(sr.ok) {
+        const sd    = await sr.json();
+        const songs = sd?.result?.songs || [];
+        const durMs = dur * 1000;
+        const song  = dur
+          ? songs.sort((a, b) => Math.abs(a.duration - durMs) - Math.abs(b.duration - durMs))
+                  .find(s => Math.abs(s.duration - durMs) <= 5000)
+          : songs[0];
+        if(song) {
+          if(token !== _lyricsLoadToken) return;
+          const lr = await fetch(
+            `https://music.163.com/api/song/lyric?id=${song.id}&lv=1&kv=1&tv=-1`,
+            { headers: { Referer: 'https://music.163.com' }, signal: AbortSignal.timeout(8000) },
+          );
+          if(lr.ok) {
+            const ld = await lr.json();
+            const lrc = ld?.lrc?.lyric;
+            if(lrc) result = { syncedLyrics: lrc };
+          }
+        }
+      }
+    } catch {}
+  }
+
   if(token !== _lyricsLoadToken) return;
   content.innerHTML = '';