saving refactorings

lib/db/poke_storage_service_impl.dart

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+import 'dart:convert';
+import 'package:flutter/services.dart';
+import 'package:hive/hive.dart';
+import 'package:tensordex_mobile/db/tables/poke_db.dart';
+import 'package:tensordex_mobile/db/poke_storage_service.dart';
+
+import 'package:tensordex_mobile/hive.dart';
+
+import '../utils/logger.dart';
+
+/// Implementation of StorageService using Hive Key-Value DB
+class PokeStorageServiceImpl implements PokeStorageService {
+  PokeStorageServiceImpl();
+
+  @override
+  Future savePoke(Poke poke) async {
+    final pokeBox = await Hive.openBox(pokeBoxName);
+    await pokeBox.put(poke.id, poke);
+  }
+
+  @override
+  Future<Poke> getPoke(String id) async {
+    final pokeBox = await Hive.openBox(pokeBoxName);
+    final poke = await pokeBox.get(id);
+    return poke;
+  }
+
+  @override
+  Future addNonExistantPokes(List<Poke> pokes) async {
+    final pokeBox = await Hive.openBox(pokeBoxName);
+
+    Future.forEach(pokes, (Poke poke) async {
+      if (!pokeBox.containsKey(poke.id)) {
+        await pokeBox.put(poke.id, poke);
+      }
+    });
+  }
+
+  @override
+  Future<void> loadDefaultPokes() async {
+    var allPokeJson = await _loadPokeJson();
+    List<Poke> pokes = [];
+    for (var pokeJson in allPokeJson) {
+      pokes.add(Poke(
+          id: pokeJson['id'].toString(),
+          name: pokeJson['name']['english'].toString(),
+          seen: false,
+          images: []));
+    }
+    await addNonExistantPokes(pokes);
+  }
+
+  Future<List<dynamic>> _loadPokeJson() async {
+    return await jsonDecode(await rootBundle.loadString('assets/pokemon.json'));
+  }
+
+  @override
+  void stop() {
+    Hive.close();
+  }
+}