import 'package:comunic/models/user.dart';

import 'database_contract.dart';
import 'database_helper.dart';

/// User database helper
///
/// @author Pierre HUBERT

class UsersDatabaseHelper {
  /// Insert a user in the database
  Future<void> _insertDB(User user) async {
    await (await DatabaseHelper.get())
        .insert(UserTableContract.TABLE_NAME, user.toMap());
  }

  /// Update a user in the database
  Future<void> _updateDB(User user) async {
    await (await DatabaseHelper.get()).update(
      UserTableContract.TABLE_NAME,
      user.toMap(),
      where: "${UserTableContract.C_ID} = ?",
      whereArgs: [user.id],
    );
  }

  /// Get a user from the database with a specified [id]
  ///
  /// Returns null if none found
  Future<User> get(int id) async {
    List<Map> maps = await (await DatabaseHelper.get()).query(
      UserTableContract.TABLE_NAME,
      where: '${UserTableContract.C_ID} = ?',
      whereArgs: [id],
    );

    if (maps.length > 0) return User.fromMap(maps[0]);

    return null;
  }

  /// Check out whether a user information specified with its [id] is present
  /// or not in the local database
  Future<bool> has(int id) async {
    return (await get(id)) != null;
  }

  /// Insert or update information about a user (depends of the presence
  /// of previous user information in the database
  Future<void> insertOrUpdate(User user) async {
    if (await has(user.id))
      await _updateDB(user);
    else
      await _insertDB(user);
  }

  /// Insert or update an important amount of user information
  Future<void> insertOrUpdateAll(List<User> list) async {
    for(int i = 0; i < list.length; i++)
      await insertOrUpdate(list[i]);
  }
}