import 'dart:convert';
import 'package:uuid/uuid.dart';
import 'package:Envelope/models/conversation_users.dart';
import 'package:intl/intl.dart';
import 'package:http/http.dart' as http;
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:pointycastle/export.dart';
import 'package:sqflite/sqflite.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '/utils/storage/session_cookie.dart';
import '/utils/storage/encryption_keys.dart';
import '/utils/storage/database.dart';
import '/models/conversations.dart';
import '/models/messages.dart';

Future<void> updateMessageThread(Conversation conversation, {RSAPrivateKey? privKey}) async {
  privKey ??= await getPrivateKey();
  final preferences = await SharedPreferences.getInstance();
  String username = preferences.getString('username')!;
  ConversationUser currentUser = await getConversationUserByUsername(conversation, username);

  var resp = await http.get(
      Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/messages/${currentUser.associationKey}'),
      headers: {
        'cookie': await getSessionCookie(),
      }
  );

  if (resp.statusCode != 200) {
    throw Exception(resp.body);
  }

  List<dynamic> messageThreadJson = jsonDecode(resp.body);

  final db = await getDatabaseConnection();

  for (var i = 0; i < messageThreadJson.length; i++) {
    Message message = Message.fromJson(
        messageThreadJson[i] as Map<String, dynamic>,
        privKey,
    );

    ConversationUser messageUser = await getConversationUserById(conversation, message.senderId);
    message.senderUsername = messageUser.username;

    await db.insert(
        'messages',
        message.toMap(),
        conflictAlgorithm: ConflictAlgorithm.replace,
    );
  }
}

Future<void> updateMessageThreads({List<Conversation>? conversations}) async {
  try {
    RSAPrivateKey privKey = await getPrivateKey();

    conversations ??= await getConversations();

    for (var i = 0; i < conversations.length; i++) {
      await updateMessageThread(conversations[i], privKey: privKey);
    }
  } catch(SocketException) {
    return;
  }
}

Future<void> sendMessage(Conversation conversation, String data) async {
  final preferences = await SharedPreferences.getInstance();
  final userId = preferences.getString('userId');
  final username = preferences.getString('username');
  if (userId == null || username == null) {
    throw Exception('Invalid user id');
  }

  var uuid = const Uuid();
  final String messageDataId = uuid.v4();

  ConversationUser currentUser = await getConversationUserByUsername(conversation, username);

  Message message = Message(
      id: messageDataId,
      symmetricKey: '',
      userSymmetricKey: '',
      senderId: userId,
      senderUsername: username,
      data: data,
      associationKey: currentUser.associationKey,
      createdAt: DateTime.now().toIso8601String(),
      failedToSend: false,
  );

  final db = await getDatabaseConnection();

  await db.insert(
      'messages',
      message.toMap(),
      conflictAlgorithm: ConflictAlgorithm.replace,
  );

  String sessionCookie = await getSessionCookie();

  message.toJson(conversation, messageDataId)
      .then((messageJson) {
        return http.post(
            Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/message'),
            headers: <String, String>{
              'Content-Type': 'application/json; charset=UTF-8',
              'cookie': sessionCookie,
            },
            body: messageJson,
        );
      })
      .then((resp) {
        if (resp.statusCode != 200) {
          throw Exception('Unable to send message');
        }
      })
      .catchError((exception) {
        message.failedToSend = true;
        db.update(
            'messages',
            message.toMap(),
            where: 'id = ?',
            whereArgs: [message.id],
        );
      });
}