Envelope/mobile/lib/database/repositories/friends_repository.dart

import '/database/models/friends.dart';
import '/utils/encryption/crypto_utils.dart';
import '/utils/storage/database.dart';

class FriendsRepository {

  static Future<Friend> getFriendByFriendId(String userId) async {
    final db = await getDatabaseConnection();

    final List<Map<String, dynamic>> maps = await db.query(
        'friends',
        where: 'friend_id = ?',
        whereArgs: [userId],
    );

    if (maps.length != 1) {
      throw ArgumentError('Invalid user id');
    }

    return Friend(
      id: maps[0]['id'],
      userId: maps[0]['user_id'],
      friendId: maps[0]['friend_id'],
      friendSymmetricKey: maps[0]['symmetric_key'],
      publicKey: CryptoUtils.rsaPublicKeyFromPem(maps[0]['asymmetric_public_key']),
      acceptedAt: maps[0]['accepted_at'] != null ? DateTime.parse(maps[0]['accepted_at']) : null,
      username: maps[0]['username'],
    );
  }

  static Future<List<Friend>> getFriends({bool? accepted}) async {
    final db = await getDatabaseConnection();

    String? where;

    if (accepted == true) {
      where = 'accepted_at IS NOT NULL';
    }

    if (accepted == false) {
      where = 'accepted_at IS NULL';
    }

    final List<Map<String, dynamic>> maps = await db.query(
      'friends',
      where: where,
      orderBy: 'accepted_at IS NOT NULL',
    );

    return List.generate(maps.length, (i) {
      return Friend(
          id: maps[i]['id'],
          userId: maps[i]['user_id'],
          friendId: maps[i]['friend_id'],
          friendSymmetricKey: maps[i]['symmetric_key'],
          publicKey: CryptoUtils.rsaPublicKeyFromPem(maps[i]['asymmetric_public_key']),
          acceptedAt: maps[i]['accepted_at'] != null ? DateTime.parse(maps[i]['accepted_at']) : null,
          username: maps[i]['username'],
      );
    });
  }

  static Future<DateTime?> getLatestAcceptedAt() async {
    final db = await getDatabaseConnection();

    final List<Map<String, dynamic>> maps = await db.rawQuery(
      '''
      SELECT friends.accepted_at FROM friends
      ORDER BY accepted_at DESC
      LIMIT 1;
      '''
    );

    return maps.isNotEmpty ? DateTime.parse(maps[0]['accepted_at']) : null;
  }
}