Envelope/mobile/lib/database/models/conversations.dart

import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';

import 'package:Envelope/database/repositories/friends_repository.dart';
import 'package:mime/mime.dart';
import 'package:pointycastle/export.dart';
import 'package:uuid/uuid.dart';

import '/database/repositories/conversation_users_repository.dart';
import '/database/models/messages.dart';
import '/database/models/text_messages.dart';
import '/database/models/conversation_users.dart';
import '/database/models/friends.dart';
import '/database/models/my_profile.dart';
import '/utils/encryption/aes_helper.dart';
import '/utils/encryption/crypto_utils.dart';
import '/utils/storage/database.dart';
import '/utils/storage/write_file.dart';

enum ConversationStatus {
  complete,
  pending,
  error,
}

class Conversation {
  String id;
  String userId;
  String symmetricKey;
  bool admin;
  String name;
  bool twoUser;
  ConversationStatus status;
  bool isRead;
  String messageExpiryDefault = 'no_expiry';
  bool adminAddMembers = true;
  bool adminEditInfo = true;
  bool adminSendMessages = false;
  File? icon;

  Conversation({
    required this.id,
    required this.userId,
    required this.symmetricKey,
    required this.admin,
    required this.name,
    required this.twoUser,
    required this.status,
    required this.isRead,
    required this.messageExpiryDefault,
    required this.adminAddMembers,
    required this.adminEditInfo,
    required this.adminSendMessages,
    this.icon,
  });


  factory Conversation.fromJson(Map<String, dynamic> json, RSAPrivateKey privKey) {
    var symmetricKeyDecrypted = CryptoUtils.rsaDecrypt(
      base64.decode(json['symmetric_key']),
      privKey,
    );

    var id = AesHelper.aesDecrypt(
      symmetricKeyDecrypted,
      base64.decode(json['conversation_detail_id']),
    );

    var admin = AesHelper.aesDecrypt(
      symmetricKeyDecrypted,
      base64.decode(json['admin']),
    );

    return Conversation(
      id: id,
      userId: json['user_id'],
      symmetricKey: base64.encode(symmetricKeyDecrypted),
      admin: admin == 'true',
      name: 'Unknown',
      twoUser: false,
      status: ConversationStatus.complete,
      isRead: true,
      messageExpiryDefault: 'no_expiry',
      adminAddMembers: true,
      adminEditInfo: true,
      adminSendMessages: false,
    );
  }

  Future<Map<String, dynamic>> payloadJson({ bool includeUsers = true }) async {
    MyProfile profile = await MyProfile.getProfile();

    var symKey = base64.decode(symmetricKey);

    if (!includeUsers) {
      return {
        'id': id,
        'name': AesHelper.aesEncrypt(symKey, Uint8List.fromList(name.codeUnits)),
        'users': await ConversationUsersRepository.getEncryptedConversationUsers(this, symKey),
      };
    }

    List<ConversationUser> users = await ConversationUsersRepository.getConversationUsers(this);

    List<Object> userConversations = [];

    for (ConversationUser user in users) {

      RSAPublicKey pubKey = profile.publicKey!;
      String newId = id;

      if (profile.id != user.userId) {
        Friend friend = await FriendsRepository.getFriendByFriendId(user.userId);
        pubKey = friend.publicKey;
        newId = (const Uuid()).v4();
      }

      userConversations.add({
        'id': newId,
        'user_id': user.userId,
        'conversation_detail_id': AesHelper.aesEncrypt(symKey, Uint8List.fromList(id.codeUnits)),
        'admin': AesHelper.aesEncrypt(symKey, Uint8List.fromList((user.admin ? 'true' : 'false').codeUnits)),
        'symmetric_key': base64.encode(CryptoUtils.rsaEncrypt(symKey, pubKey)),
      });
    }

    Map<String, dynamic> returnData = {
      'id': id,
      'name': AesHelper.aesEncrypt(symKey, Uint8List.fromList(name.codeUnits)),
      'users': await ConversationUsersRepository.getEncryptedConversationUsers(this, symKey),
      'two_user': AesHelper.aesEncrypt(symKey, Uint8List.fromList((twoUser ? 'true' : 'false').codeUnits)),
      'message_expiry': messageExpiryDefault,
      'admin_add_members': AesHelper.aesEncrypt(symKey, Uint8List.fromList((adminAddMembers ? 'true' : 'false').codeUnits)),
      'admin_edit_info': AesHelper.aesEncrypt(symKey, Uint8List.fromList((adminEditInfo ? 'true' : 'false').codeUnits)),
      'admin_send_messages': AesHelper.aesEncrypt(symKey, Uint8List.fromList((adminSendMessages ? 'true' : 'false').codeUnits)),
      'user_conversations': userConversations,
    };

    if (icon != null) {
      returnData['attachment'] = {
        'data': AesHelper.aesEncrypt(symmetricKey, Uint8List.fromList(icon!.readAsBytesSync())),
        'mimetype': lookupMimeType(icon!.path),
        'extension': getExtension(icon!.path),
      };
    }

    return returnData;
  }

  Map<String, dynamic> payloadImageJson() {
    if (icon == null) {
      return {};
    }

    return {
      'data': AesHelper.aesEncrypt(symmetricKey, Uint8List.fromList(icon!.readAsBytesSync())),
      'mimetype': lookupMimeType(icon!.path),
      'extension': getExtension(icon!.path),
    };
  }

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'user_id': userId,
      'symmetric_key': symmetricKey,
      'admin': admin ? 1 : 0,
      'name': name,
      'two_user': twoUser ? 1 : 0,
      'status': status.index,
      'is_read': isRead ? 1 : 0,
      'file': icon != null ? icon!.path : null,
      'message_expiry': messageExpiryDefault,
      'admin_add_members': adminAddMembers ? 1 : 0,
      'admin_edit_info': adminEditInfo ? 1 : 0,
      'admin_send_messages': adminSendMessages ? 1 : 0,
    };
  }

  @override
  String toString() {
    return '''


        id: $id
        userId: $userId
        name: $name
        admin: $admin''';
  }

  Future<Message?> getRecentMessage() async {
    final db = await getDatabaseConnection();

    final List<Map<String, dynamic>> maps = await db.rawQuery(
      '''
        SELECT * FROM messages WHERE association_key IN (
          SELECT association_key FROM conversation_users WHERE conversation_id = ?
        )
        ORDER BY created_at DESC
        LIMIT 1;
      ''',
      [ id ],
    );

    if (maps.isEmpty) {
      return null;
    }

    return TextMessage(
        id: maps[0]['id'],
        symmetricKey: maps[0]['symmetric_key'],
        userSymmetricKey: maps[0]['user_symmetric_key'],
        text: maps[0]['data'] ?? 'Image',
        senderId: maps[0]['sender_id'],
        senderUsername: maps[0]['sender_username'],
        associationKey: maps[0]['association_key'],
        createdAt: maps[0]['created_at'],
        failedToSend: maps[0]['failed_to_send'] == 1,
    );
  }
}