import 'package:sqflite/sqflite.dart';
import 'package:path/path.dart';
import 'package:chepuhagram/data/models/message_model.dart';

class LocalDbService {
  static final LocalDbService _instance = LocalDbService._internal();
  static Database? _database;

  factory LocalDbService() => _instance;
  LocalDbService._internal();

  Future<Database> get database async {
    if (_database != null) return _database!;
    _database = await _initDb();
    return _database!;
  }

  Future<Database> _initDb() async {
    String path = join(await getDatabasesPath(), 'chat_app.db');
    return await openDatabase(
      path,
      version: 1,
      onCreate: (db, version) async {
        await db.execute('''
          CREATE TABLE messages(
            id INTEGER PRIMARY KEY,
            sender_id INTEGER,
            receiver_id INTEGER,
            content TEXT,
            timestamp TEXT
          )
        ''');
      },
    );
  }

  // Сохранение списка сообщений (из истории)
  Future<void> saveMessages(List<dynamic> messages) async {
    final db = await database;
    Batch batch = db.batch();
    for (var msg in messages) {
      if (msg is MessageModel) {
        batch.insert('messages', {
          'id': msg.id,
          'sender_id': msg.senderId,
          'receiver_id': msg.receiverId,
          'content': msg.text, // ВАЖНО: сохраняй зашифрованный текст!
          'timestamp': msg.createdAt.toIso8601String(),
        }, conflictAlgorithm: ConflictAlgorithm.replace);
      } else {
        // Если это Map из API
        batch.insert('messages', {
          'id': msg['id'],
          'sender_id': msg['sender_id'],
          'receiver_id': msg['receiver_id'], // Убедись, что ключ совпадает с API
          'content': msg['content'],
          'timestamp': msg['timestamp'],
        }, conflictAlgorithm: ConflictAlgorithm.replace);
      }
    }
    await batch.commit(noResult: true);
  }

  // Получение сообщений конкретного чата
  Future<List<Map<String, dynamic>>> getChatHistory(
    int contactId,
    int myId,
  ) async {
    final db = await database;
    return await db.query(
      'messages',
      where:
          '(sender_id = ? AND receiver_id = ?) OR (sender_id = ? AND receiver_id = ?)',
      whereArgs: [contactId, myId, myId, contactId],
      orderBy: 'timestamp ASC',
    );
  }
}