MessagingApp/lib/components/messaging_provider.dart

import 'dart:async';
import 'dart:io';
import 'package:appwrite/appwrite.dart';
import 'package:appwrite/models.dart' as model;
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:messaging_app/components/constants.dart';
import 'package:messaging_app/models/chats.dart';
import 'package:messaging_app/models/conversations.dart';
import 'package:messaging_app/models/users.dart';
import 'package:messaging_app/service/navigation_service.dart';
import 'package:messaging_app/service/snackbar_service.dart';

enum AuthStatus {
  notAuthenticated,
  authenticated,
  authenticating,
  userNotFound,
  error,
}

class MessagingProviders extends ChangeNotifier {
  //
  Client client = Client();
  late final Account account;
  late final Databases database;
  late final Storage storage;
  late model.User? user;

  // Auth Status
  AuthStatus? status;

  static MessagingProviders instance = MessagingProviders();

  MessagingProviders() {
    _init();
    _loadUser();
  }

  _init() {
    client
        .setEndpoint(Constants.instance.endPoint)
        .setProject(Constants.instance.projectId)
        .setSelfSigned();
    account = Account(client);
    database = Databases(client);
    storage = Storage(client);
  }

  _loadUser() async {
    try {
      user = await account.get();
      if (user != null) {
        status = AuthStatus.authenticated;
        await updateLastSeen();
        NavigationService.instance.navigateToReplacement("home");
      }
    } catch (e) {
      status = AuthStatus.notAuthenticated;
    }
  }

  void login(String _email, String _password) async {
    //
    try {
      status != AuthStatus.error;

      try {
        status = AuthStatus.authenticating;
        await account.createEmailPasswordSession(
            email: _email, password: _password);

        user = await account.get();
        status = AuthStatus.authenticated;

        SnackBarService.instance.showSnackBarSuccess("Welcome! ${user!.name}");
        await updateLastSeen();
        NavigationService.instance.navigateToReplacement("home");
      } on AppwriteException catch (e) {
        SnackBarService.instance.showSnackBarError(e.message!);
        status = AuthStatus.error;
        user = null;
        //
      } on Exception catch (e) {
        SnackBarService.instance.showSnackBarError(e.toString());
        //
      }
    } on Exception catch (e) {
      SnackBarService.instance.showSnackBarError(e.toString());
    }
  }

  void logout() async {
    try {
      await updateLastSeen();
      await account.deleteSession(sessionId: 'current');
      // user = null;
      status = AuthStatus.notAuthenticated;
//      await onSuccess();
      SnackBarService.instance.showSnackBarError("logged out successfully");
      await NavigationService.instance.navigateToReplacement("login");
    } on AppwriteException catch (e) {
      SnackBarService.instance.showSnackBarError(e.message!);
    } on Exception catch (e) {
      SnackBarService.instance.showSnackBarError(e.toString());
    }
  }

  Future<void> createUser(String _email, String _password, String _name,
      Future<void> Function(String _uid) onSuccess) async {
    try {
      user = await account.create(
          userId: ID.unique(), email: _email, password: _password, name: _name);

      status = AuthStatus.authenticated;
      await onSuccess(user!.$id);
      SnackBarService.instance.showSnackBarSuccess("welcome! ${user!.name}");
      //  await updateLastSeen();
      NavigationService.instance.goBack();
      NavigationService.instance.navigateToReplacement("home");
    } on AppwriteException catch (e) {
      status = AuthStatus.error;
      user = null;
      SnackBarService.instance.showSnackBarError(e.message!);
    } on Exception catch (e) {
      SnackBarService.instance.showSnackBarError(e.toString());
      //
    }
  }

  Future<void> createUserInDB(
      String _documentId, String _email, String _name, String _imageURL) async {
    try {
      await database.createDocument(
        databaseId: Constants.instance.databaseId,
        collectionId: Constants.instance.userCollectionId,
        documentId: _documentId,
        data: {
          "name": _name,
          "email": _email,
          "lastSeen": DateTime.now().toUtc().toIso8601String(),
          "image": _imageURL
        },
        permissions: [
          Permission.read(Role.any()),
          //Permission.update(Role.user(_documentId)),
        ],
      );

      status = AuthStatus.authenticated;
    } on AppwriteException catch (e) {
      SnackBarService.instance.showSnackBarError(e.message!);
      status = AuthStatus.error;
      user = null;
      //
    } on Exception catch (e) {
      SnackBarService.instance.showSnackBarError(e.toString());
      status = AuthStatus.error;
      user = null;
      //
    }
  }

  Future<void> updateLastSeen() async {
    await database.updateDocument(
      databaseId: Constants.instance.databaseId,
      collectionId: Constants.instance.userCollectionId,
      documentId: user!.$id,
      data: {"lastSeen": DateTime.now().toUtc().toIso8601String()},
    );
  }

  Stream<User> getUser(String userId) async* {
    //
    var _userData = database.getDocument(
      databaseId: Constants.instance.databaseId,
      collectionId: Constants.instance.userCollectionId,
      documentId: userId,
    );

    updateLastSeen();
    yield* _userData.asStream().map((_document) {
      return User.fromData(_document);
    });
  }

  Stream<List<User>> getAllUsers(String _searchText) async* {
    //
    List<User> _returnValue = [];
    if (_searchText.isNotEmpty) {
      var _usersData = database.listDocuments(
        databaseId: Constants.instance.databaseId,
        collectionId: Constants.instance.userCollectionId,
        queries: [
          Query.contains("name", _searchText),
        ],
      );

      yield* _usersData.asStream().map(
        (_documentList) {
          for (var _document in _documentList.documents) {
            _returnValue.add(User.fromData(_document));
          }
          _returnValue.sort((a, b) => b.lastSeen.compareTo(a.lastSeen));
          return _returnValue;
        },
      );
    } else {
      yield* Stream.empty();
    }
  }

  Stream<List<Conversations>> getUserConversation(String userId) async* {
    //
    List<dynamic> _chatId = [];
    List<dynamic> _details = [];
    List<dynamic> _lastModified = [];
    List<Conversations> _returnValue = [];

    var _conversationData = database.getDocument(
      databaseId: Constants.instance.databaseId,
      collectionId: Constants.instance.convCollectionId,
      documentId: userId.trim(),
    );

    yield* _conversationData.asStream().map(
      (_snapshot) {
        _chatId = _snapshot.data['chatId'];
        _details = _snapshot.data['details'];
        _lastModified = _snapshot.data['lastModified'];

        for (int i = 0; i < _chatId.length; i++) {
          _returnValue.add(Conversations.fromData(
              _chatId[i], _details[i], _lastModified[i]));
        }
        _returnValue.sort((a, b) => b.lastModified!.compareTo(a.lastModified!));
        return _returnValue;
      },
    );

    notifyListeners();
  }

  Stream<Chats> getMessage(String _chatId) async* {
    //
    try {
      var _chat = database.getDocument(
        databaseId: Constants.instance.databaseId,
        collectionId: Constants.instance.chatsCollectionId,
        documentId: _chatId,
      );
      yield* _chat.asStream().map(
        (_document) {
          return Chats.fromDocument(_document);
        },
      );
    } on AppwriteException catch (e) {
      e.message!;
      yield* Stream.empty();
    } on Exception catch (e) {
      e.toString();
      yield* Stream.empty();
    }
    // else {}
    notifyListeners();
  }

  Future<void> sendMessage(String _chatId, Map<String, dynamic> _messages,
      String _newOrUpdate) async {
    //
    if (_newOrUpdate == 'new') {
      await database.createDocument(
        databaseId: Constants.instance.databaseId,
        collectionId: Constants.instance.chatsCollectionId,
        documentId: _chatId,
        data: _messages,
      );
    } else if (_newOrUpdate == 'update') {
      await database.updateDocument(
        databaseId: Constants.instance.databaseId,
        collectionId: Constants.instance.chatsCollectionId,
        documentId: _chatId,
        data: _messages,
      );
    }

    notifyListeners();
  }

  Future<String> uploadUserImage(XFile? file, String _uid) async {
    //
    notifyListeners();
    try {
      File _file = File(file!.path);
      var _message = await storage.createFile(
        bucketId: Constants.instance.imageStorageBucket,
        fileId: ID.unique(),
        file: InputFile.fromPath(path: _file.path, filename: file.name),
        permissions: [
          Permission.read(Role.any()),
          // Permission.update(Role.user(_uid))
        ],
      );

      return "${Constants.instance.endPoint}/storage/buckets/${_message.bucketId}/files/${_message.$id}/view?project=${Constants.instance.projectId}";
    } on AppwriteException catch (e) {
      SnackBarService.instance.showSnackBarError(e.message!);
      //
    } on Exception catch (e) {
      status = AuthStatus.error;
      user = null;
      SnackBarService.instance.showSnackBarError(e.toString());
      //
    }
    return "";
  }
}