kickoff library item

lib/api/library_item_provider.dart

@@ -0,0 +1,49 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:shelfsdk/audiobookshelf_api.dart' as shelfsdk;
+import 'package:whispering_pages/api/api_provider.dart';
+import 'package:whispering_pages/db/cache/cache_key.dart';
+import 'package:whispering_pages/db/cache_manager.dart';
+
+part 'library_item_provider.g.dart';
+
+/// provides the library item for the given id
+@riverpod
+class LibraryItem extends _$LibraryItem {
+  @override
+  Stream<shelfsdk.LibraryItem> build(String id) async* {
+    final api = ref.watch(authenticatedApiProvider);
+
+    debugPrint('fetching library item: $id');
+
+    // ! this is a mock delay
+    // await Future.delayed(const Duration(seconds: 10));
+
+    // look for the item in the cache
+    final key = CacheKey.libraryItem(id);
+    final cachedFile = await apiResponseCacheManager.getFileFromMemory(key) ??
+        await apiResponseCacheManager.getFileFromCache(key);
+    if (cachedFile != null) {
+      debugPrint('reading from cache for $id from ${cachedFile.file}');
+      // read file as json
+      final cachedItem = shelfsdk.LibraryItem.fromJson(
+        jsonDecode(await cachedFile.file.readAsString()),
+      );
+      yield cachedItem;
+    }
+    final item = await api.items.get(libraryItemId: id);
+    if (item != null) {
+      // save to cache
+      final newFile = await apiResponseCacheManager.putFile(
+        key,
+        utf8.encode(jsonEncode(item)),
+        fileExtension: 'json',
+        key: key,
+      );
+      debugPrint('writing to cache: $newFile');
+      yield item;
+    }
+  }
+}