feat: 添加离线视频下载和缓存功能

lib/hive_registrar.g.dart

@@ -7,6 +7,7 @@ import 'package:kazumi/modules/bangumi/bangumi_item.dart';
 import 'package:kazumi/modules/bangumi/bangumi_tag.dart';
 import 'package:kazumi/modules/collect/collect_change_module.dart';
 import 'package:kazumi/modules/collect/collect_module.dart';
+import 'package:kazumi/modules/download/download_module.dart';
 import 'package:kazumi/modules/history/history_module.dart';
 import 'package:kazumi/modules/search/search_history_module.dart';
 
@@ -16,6 +17,8 @@ extension HiveRegistrar on HiveInterface {
     registerAdapter(BangumiTagAdapter());
     registerAdapter(CollectedBangumiAdapter());
     registerAdapter(CollectedBangumiChangeAdapter());
+    registerAdapter(DownloadEpisodeAdapter());
+    registerAdapter(DownloadRecordAdapter());
     registerAdapter(HistoryAdapter());
     registerAdapter(ProgressAdapter());
     registerAdapter(SearchHistoryAdapter());
@@ -28,6 +31,8 @@ extension IsolatedHiveRegistrar on IsolatedHiveInterface {
     registerAdapter(BangumiTagAdapter());
     registerAdapter(CollectedBangumiAdapter());
     registerAdapter(CollectedBangumiChangeAdapter());
+    registerAdapter(DownloadEpisodeAdapter());
+    registerAdapter(DownloadRecordAdapter());
     registerAdapter(HistoryAdapter());
     registerAdapter(ProgressAdapter());
     registerAdapter(SearchHistoryAdapter());

lib/main.dart

@@ -34,10 +34,13 @@ void main() async {
   }
 
   try {
-    await Hive.initFlutter(
-        '${(await getApplicationSupportDirectory()).path}/hive');
+    final hivePath = '${(await getApplicationSupportDirectory()).path}/hive';
+    await Hive.initFlutter(hivePath);
     await GStorage.init();
-  } catch (_) {
+  } catch (e) {
+    // Log the error for debugging (if logger is available)
+    debugPrint('Storage initialization failed: $e');
+
     if (Platform.isWindows) {
       await windowManager.ensureInitialized();
       windowManager.waitUntilReadyToShow(null, () async {

lib/modules/danmaku/danmaku_module.dart

@@ -24,4 +24,16 @@ class Danmaku {
     String sourceValue = parts[3];
     return Danmaku(time: timeValue, message: messageValue, type: typeValue, color: color, source: sourceValue);
   }
+
+  /// 序列化为 JSON 格式 (与 fromJson 格式一致)
+  Map<String, dynamic> toJson() {
+    // 只存储 RGB 部分 (与 DanDanPlay API 格式一致)
+    final colorValue = ((color.r * 255).toInt() << 16) |
+                       ((color.g * 255).toInt() << 8) |
+                       (color.b * 255).toInt();
+    return {
+      'm': message,
+      'p': '$time,$type,$colorValue,$source',
+    };
+  }
 }

lib/modules/download/download_module.dart

@@ -0,0 +1,117 @@
+import 'package:hive_ce/hive.dart';
+
+part 'download_module.g.dart';
+
+@HiveType(typeId: 7)
+class DownloadRecord {
+  @HiveField(0)
+  int bangumiId;
+
+  @HiveField(1)
+  String bangumiName;
+
+  @HiveField(2)
+  String bangumiCover;
+
+  @HiveField(3)
+  String pluginName;
+
+  @HiveField(4)
+  Map<int, DownloadEpisode> episodes;
+
+  @HiveField(5)
+  DateTime createdAt;
+
+  String get key => '${pluginName}_$bangumiId';
+
+  DownloadRecord(
+    this.bangumiId,
+    this.bangumiName,
+    this.bangumiCover,
+    this.pluginName,
+    this.episodes,
+    this.createdAt,
+  );
+}
+
+@HiveType(typeId: 8)
+class DownloadEpisode {
+  @HiveField(0)
+  int episodeNumber;
+
+  @HiveField(1)
+  String episodeName;
+
+  @HiveField(2)
+  int road;
+
+  /// 0=pending 1=resolving 2=downloading 3=completed 4=failed 5=paused
+  @HiveField(3)
+  int status;
+
+  @HiveField(4)
+  double progressPercent;
+
+  @HiveField(5)
+  int totalSegments;
+
+  @HiveField(6)
+  int downloadedSegments;
+
+  @HiveField(7)
+  String localM3u8Path;
+
+  @HiveField(8)
+  String downloadDirectory;
+
+  @HiveField(9)
+  String networkM3u8Url;
+
+  @HiveField(10)
+  DateTime? completedAt;
+
+  @HiveField(11, defaultValue: '')
+  String errorMessage;
+
+  @HiveField(12, defaultValue: 0)
+  int totalBytes;
+
+  @HiveField(13, defaultValue: '')
+  String episodePageUrl;
+
+  /// 缓存的弹幕数据 (JSON 字符串格式)
+  @HiveField(14, defaultValue: '')
+  String danmakuData;
+
+  /// DanDanPlay 番剧 ID (用于弹幕查询缓存)
+  @HiveField(15, defaultValue: 0)
+  int danDanBangumiID;
+
+  DownloadEpisode(
+    this.episodeNumber,
+    this.episodeName,
+    this.road,
+    this.status,
+    this.progressPercent,
+    this.totalSegments,
+    this.downloadedSegments,
+    this.localM3u8Path,
+    this.downloadDirectory,
+    this.networkM3u8Url,
+    this.completedAt,
+    this.errorMessage,
+    this.totalBytes,
+    this.episodePageUrl, {
+    this.danmakuData = '',
+    this.danDanBangumiID = 0,
+  });
+}
+
+class DownloadStatus {
+  static const int pending = 0;
+  static const int resolving = 1;
+  static const int downloading = 2;
+  static const int completed = 3;
+  static const int failed = 4;
+  static const int paused = 5;
+}