pharmacy/lib/chat/chat_controller.dart

import 'dart:io';

import 'package:firebase_storage/firebase_storage.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'chatmessage.dart';


class ChatController extends GetxController {
  final CollectionReference _messagesCollection =
  FirebaseFirestore.instance.collection('messages');

  // Observable list of messages
  RxList<ChatMessage> messages = <ChatMessage>[].obs;

  void sendMessage(String messageContent, String messageType, bool isText) async {
    try {
      await _messagesCollection.add({
        'messageContent': messageContent,
        'messageType': messageType,
        'isText': isText,
        'timestamp': Timestamp.now(),
      });
      print("Message sent successfully");
    } catch (e) {
      print('Error sending message: $e');
    }
  }

  Future<String> uploadImage(File image, String id) async {
    try {
      String fileName = DateTime.now().millisecondsSinceEpoch.toString();
      Reference storageReference =
      FirebaseStorage.instance.ref().child('products/$fileName');
      SettableMetadata metadata = SettableMetadata(contentType: 'image/jpeg');
      UploadTask uploadTask = storageReference.putFile(image, metadata);

      String temporaryMessageId = UniqueKey().toString();
      messages.add(ChatMessage(
        messageContent: 'Uploading...',
        messageType: id,
        isText: true,
        temporaryMessageId: temporaryMessageId,
      ));

      TaskSnapshot taskSnapshot = await uploadTask;
      String downloadURL = await storageReference.getDownloadURL();

      // Replace the temporary message with the uploaded image
      int index = messages.indexWhere((message) => message.temporaryMessageId == temporaryMessageId);
      if (index != -1) {
        messages[index] = ChatMessage(
          messageContent: downloadURL,
          messageType: id,
          isText: false,
          temporaryMessageId: '',
        );
      }

      print('Image uploaded successfully. Download URL: $downloadURL');
      return downloadURL;
    } catch (e) {
      print('Error uploading image: $e');
      throw e;
    }
  }

  Stream<QuerySnapshot> getMessagesStream() {
    return _messagesCollection.orderBy('timestamp').snapshots();
  }

  @override
  void onInit() {
    super.onInit();
    // Listen for changes in the messages collection and update the local list
    getMessagesStream().listen((QuerySnapshot snapshot) {
      messages.assignAll(snapshot.docs.map((doc) => ChatMessage(
        messageContent: doc['messageContent'],
        messageType: doc['messageType'],
        isText: doc['isText'],
        temporaryMessageId: '',
      )));
    });


  }
}