login api added.

lib/api/authentication_api_client.dart

@@ -1,3 +1,15 @@
-class AuthenticationApiClient{
-  
-}
+import 'package:tangheem/classes/consts.dart';
+import 'package:tangheem/models/authentication_user_model.dart';
+import 'api_client.dart';
+
+class AuthenticationApiClient {
+  static final AuthenticationApiClient _instance = AuthenticationApiClient._internal();
+  AuthenticationApiClient._internal();
+  factory AuthenticationApiClient() => _instance;
+
+  Future<AuthenticationUserModel> authenticateUser(String email, String password) async {
+    String url = "${ApiConsts.authentication}Login";
+    var postParams = {"email": email, "password": password};
+    return await ApiClient().postJsonForObject((json) => AuthenticationUserModel.fromJson(json), url, postParams);
+  }
+}

lib/api/tangheem_user_api_client.dart

@@ -1,6 +1,6 @@
 import 'dart:async';
 
-import 'package:tangheem/api/api_client.dart';
+import 'api_client.dart';
 import 'package:tangheem/classes/consts.dart';
 import 'package:tangheem/models/aya_model.dart';
 import 'package:tangheem/models/surah_model.dart';

lib/api/user_api_client.dart

@@ -1 +1,8 @@
-class UserApiClient {}
+import 'package:tangheem/classes/consts.dart';
+import 'api_client.dart';
+
+class UserApiClient {
+  static final UserApiClient _instance = UserApiClient._internal();
+  UserApiClient._internal();
+  factory UserApiClient() => _instance;
+}

lib/models/authentication_user_model.dart

@@ -1,13 +1,36 @@
 class AuthenticationUserModel {
+  int statusCode;
+  String message;
+  Result result;
+
+  AuthenticationUserModel({this.statusCode, this.message, this.result});
+
+  AuthenticationUserModel.fromJson(Map<String, dynamic> json) {
+    statusCode = json['statusCode'];
+    message = json['message'];
+    result = json['result'] != null ? new Result.fromJson(json['result']) : null;
+  }
+
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> data = new Map<String, dynamic>();
+    data['statusCode'] = this.statusCode;
+    data['message'] = this.message;
+    if (this.result != null) {
+      data['result'] = this.result.toJson();
+    }
+    return data;
+  }
+}
+
+class Result {
   int totalItemsCount;
   int statusCode;
   String message;
   Data data;
 
-  AuthenticationUserModel(
-      {this.totalItemsCount, this.statusCode, this.message, this.data});
+  Result({this.totalItemsCount, this.statusCode, this.message, this.data});
 
-  AuthenticationUserModel.fromJson(Map<String, dynamic> json) {
+  Result.fromJson(Map<String, dynamic> json) {
     totalItemsCount = json['totalItemsCount'];
     statusCode = json['statusCode'];
     message = json['message'];
@@ -52,4 +75,4 @@ class Data {
     data['userName'] = this.userName;
     return data;
   }
-}
+}

lib/ui/screens/login_screen.dart

@@ -1,10 +1,13 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
+import 'package:tangheem/api/authentication_api_client.dart';
 import 'package:tangheem/classes/colors.dart';
 import 'package:tangheem/classes/utils.dart';
+import 'package:tangheem/models/authentication_user_model.dart';
 import 'package:tangheem/ui/screens/forgot_password_screen.dart';
 import 'package:tangheem/ui/screens/registration_screen.dart';
 import 'package:tangheem/widgets/common_textfield_widget.dart';
+import 'package:tangheem/extensions/email_validator.dart';
 
 class LoginScreen extends StatefulWidget {
   static const String routeName = "/login";
@@ -18,10 +21,12 @@ class LoginScreen extends StatefulWidget {
 }
 
 class _LoginScreenState extends State<LoginScreen> {
-  TextEditingController _usernameController = TextEditingController();
+  TextEditingController _emailController = TextEditingController();
   TextEditingController _passwordController = TextEditingController();
   bool _isRemember = true;
 
+  AuthenticationUserModel _authenticationUser;
+
   @override
   void initState() {
     super.initState();
@@ -32,6 +37,18 @@ class _LoginScreenState extends State<LoginScreen> {
     super.dispose();
   }
 
+  void performLogin(String email, String password) async {
+    Utils.showLoading(context);
+    try {
+      _authenticationUser = await AuthenticationApiClient().authenticateUser(email, password);
+      Utils.showToast("Login successfully");
+    } catch (ex, tr) {
+      Utils.handleException(ex, null);
+    } finally {
+      Utils.hideLoading(context);
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -65,7 +82,8 @@ class _LoginScreenState extends State<LoginScreen> {
                     child: Column(
                       mainAxisSize: MainAxisSize.min,
                       children: [
-                        CommonTextFieldWidget(hint: "اسم المستخدم", controller: _usernameController, prefixIcon: "assets/icons/user.svg"),
+                        // todo @discuss wiht haroon to change hint to email, because auth depends on email
+                        CommonTextFieldWidget(hint: "اسم المستخدم", controller: _emailController, prefixIcon: "assets/icons/user.svg"),
                         SizedBox(height: 16),
                         CommonTextFieldWidget(hint: "كلمة المرور", controller: _passwordController, isPassword: true, prefixIcon: "assets/icons/password.svg"),
                         SizedBox(height: 16),
@@ -74,15 +92,18 @@ class _LoginScreenState extends State<LoginScreen> {
                           height: 50,
                           child: TextButton(
                             onPressed: () {
-                              if (_usernameController.text.length < 1) {
-                                Utils.showToast("Username is empty.");
+                              if (_emailController.text.length < 1) {
+                                Utils.showToast("Email is empty.");
+                                return;
+                              } else if (!_emailController.text.isValidEmail()) {
+                                Utils.showToast("Invalid email.");
                                 return;
                               }
                               if (_passwordController.text.length < 1) {
                                 Utils.showToast("Password is empty.");
                                 return;
                               }
-                              Utils.showToast("Login successfully");
+                              performLogin(_emailController.text, _passwordController.text);
                             },
                             style: TextButton.styleFrom(
                               primary: Colors.white,