feat(chat): Classes added to chat screen

lib/presentation/chat/chat_screen/bloc/chat_bloc.dart

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+import 'package:equatable/equatable.dart';
+import 'package:flutter/material.dart';
+import '/core/app_export.dart';
+import 'package:eatvio_app/presentation/chat/chat_screen/models/chat_model.dart';
+part 'chat_event.dart';
+part 'chat_state.dart';
+
+/// A bloc that manages the state of a Chat according to the event that is dispatched to it.
+class ChatBloc extends Bloc<ChatEvent, ChatState> {
+  ChatBloc(ChatState initialState) : super(initialState) {
+    on<ChatInitialEvent>(_onInitialize);
+  }
+
+  _onInitialize(
+    ChatInitialEvent event,
+    Emitter<ChatState> emit,
+  ) async {
+    emit(state.copyWith(chatModelObj: state.chatModelObj?.copyWith()));
+  }
+}

lib/presentation/chat/chat_screen/bloc/chat_event.dart

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+// ignore_for_file: must_be_immutable
+
+part of 'chat_bloc.dart';
+
+/// Abstract class for all events that can be dispatched from the
+///Chat widget.
+///
+/// Events must be immutable and implement the [Equatable] interface.
+@immutable
+abstract class ChatEvent extends Equatable {}
+
+/// Event that is dispatched when the Chat widget is first created.
+class ChatInitialEvent extends ChatEvent {
+  @override
+  List<Object?> get props => [];
+}
+
+///event for dropdown selection
+class ChangeDropDownEvent extends ChatEvent {
+  ChangeDropDownEvent({required this.value});
+
+  SelectionPopupModel value;
+
+  @override
+  List<Object?> get props => [
+        value,
+      ];
+}

lib/presentation/chat/chat_screen/bloc/chat_state.dart

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+// ignore_for_file: must_be_immutable
+
+part of 'chat_bloc.dart';
+
+/// Represents the state of Chat in the application.
+class ChatState extends Equatable {
+  ChatState({
+    this.selectedDropDownValue,
+    this.chatModelObj,
+  });
+
+  SelectionPopupModel? selectedDropDownValue;
+
+  ChatModel? chatModelObj;
+
+  @override
+  List<Object?> get props => [
+        selectedDropDownValue,
+        chatModelObj,
+      ];
+  ChatState copyWith({
+    SelectionPopupModel? selectedDropDownValue,
+    ChatModel? chatModelObj,
+  }) {
+    return ChatState(
+      selectedDropDownValue:
+          selectedDropDownValue ?? this.selectedDropDownValue,
+      chatModelObj: chatModelObj ?? this.chatModelObj,
+    );
+  }
+}

lib/presentation/chat/chat_screen/chat_screen.dart

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+import 'bloc/chat_bloc.dart';
+import 'models/chat_model.dart';
+import 'package:eatvio_app/core/app_export.dart';
+import 'package:flutter/material.dart';
+
+class ChatScreen extends StatelessWidget {
+  const ChatScreen({Key? key}) : super(key: key);
+  static Widget builder(BuildContext context) {
+    return BlocProvider<ChatBloc>(
+        create: (context) => ChatBloc(ChatState(chatModelObj: ChatModel()))
+          ..add(ChatInitialEvent()),
+        child: ChatScreen());
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    mediaQueryData = MediaQuery.of(context);
+    return Container();
+  }
+}

lib/presentation/chat/chat_screen/models/chat_model.dart

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+// ignore_for_file: must_be_immutable
+
+import 'package:equatable/equatable.dart';
+
+/// This class defines the variables used in the [chat_screen],
+/// and is typically used to hold data that is passed between different parts of the application.
+class ChatModel extends Equatable {
+  ChatModel();
+
+  ChatModel copyWith() {
+    return ChatModel();
+  }
+
+  @override
+  List<Object?> get props => [];
+}