message send recieve

login/lib/api/apis.dart

@@ -1,9 +1,12 @@
+// ignore_for_file: avoid_print
+
 import 'dart:io';
 
 import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:firebase_auth/firebase_auth.dart';
 import 'package:firebase_storage/firebase_storage.dart';
 import 'package:login/model/chat_user_model.dart';
+import 'package:login/model/messages.dart';
 
 class APIs {
   // for authentication
@@ -73,7 +76,6 @@ class APIs {
     });
   }
 
-  //for updating the profile picture
   // update profile picture of user
   static Future<void> updateProfilePicture(File file) async {
     //getting image file extension
@@ -98,11 +100,50 @@ class APIs {
         .update({'image': me.Image});
   }
 
-  // CHAT SCREEN RELATED APIS
+  ///************** Chat Screen Related APIs **************
+
+  // chats (collection) --> conversation_id (doc) --> messages (collection) --> message (doc)
+
+  // useful for getting conversation id
+  static String getConversationID(String id) => user.uid.hashCode <= id.hashCode
+      ? '${user.uid}_$id'
+      : '${id}_${user.uid}';
+
   static Stream<QuerySnapshot<Map<String, dynamic>>> getAllMessages(
       ChatUser user) {
-    return firestore.collection('messages').snapshots();
+    return firestore
+        .collection('chats/${getConversationID(user.Id)}/messages/')
+        .orderBy('sent', descending: false)
+        .snapshots();
   }
 
-  static getUserInfo(ChatUser user) {}
+  // for sending message
+  static Future<void> sendMessage(
+    ChatUser chatUser,
+    String msg,
+  ) async {
+    //message sending time (also used as id)
+    final time = DateTime.now().millisecondsSinceEpoch.toString();
+
+    //message to send
+    final Message message = Message(
+        toId: chatUser.Id,
+        msg: msg,
+        read: '',
+        type: Type.text,
+        fromId: user.uid,
+        sent: time);
+
+    final ref = firestore
+        .collection('chats/${getConversationID(chatUser.Id)}/messages/');
+    await ref.doc(time).set(message.toJson());
+  }
+
+  //update read status of message
+  static Future<void> updateMessageReadStatus(Message message) async {
+    firestore
+        .collection('chats/${getConversationID(message.fromId)}/messages/')
+        .doc(message.sent)
+        .update({'read': DateTime.now().millisecondsSinceEpoch.toString()});
+  }
 }

login/lib/dialogs/my_date_util.dart

@@ -0,0 +1,10 @@
+import 'package:flutter/material.dart';
+
+class MyDateUtil {
+  // for getting formatted time from milliSecondsSinceEpochs String
+  static String getFormattedTime(
+      {required BuildContext context, required String time}) {
+    final date = DateTime.fromMillisecondsSinceEpoch(int.parse(time));
+    return TimeOfDay.fromDateTime(date).format(context);
+  }
+}

login/lib/model/messages.dart

@@ -0,0 +1,39 @@
+class Message {
+  Message({
+    required this.toId,
+    required this.msg,
+    required this.read,
+    required this.type,
+    required this.fromId,
+    required this.sent,
+  });
+
+  late final String toId;
+  late final String msg;
+  late final String read;
+  late final String fromId;
+  late final String sent;
+  late final Type type;
+
+  Message.fromJson(Map<String, dynamic> json) {
+    toId = json['toId'].toString();
+    msg = json['msg'].toString();
+    read = json['read'].toString();
+    type = json['type'].toString() == Type.image.name ? Type.image : Type.text;
+    fromId = json['fromId'].toString();
+    sent = json['sent'].toString();
+  }
+
+  Map<String, dynamic> toJson() {
+    final data = <String, dynamic>{};
+    data['toId'] = toId;
+    data['msg'] = msg;
+    data['read'] = read;
+    data['type'] = type.name;
+    data['fromId'] = fromId;
+    data['sent'] = sent;
+    return data;
+  }
+}
+
+enum Type { text, image }