ui improvements

lib/screens/onboarding/login/login_controller.dart

@@ -0,0 +1,80 @@
+import 'package:dio/dio.dart';
+import 'package:flutter/material.dart';
+import 'package:qpay/http/http.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class LoginScreenModel {
+  String username = "";
+  String password = "";
+  String status = "PENDING";
+
+  bool isLoading = false;
+  String? errorMessage;
+}
+
+class LoginController extends ChangeNotifier {
+  final Http http = Http();
+  final model = LoginScreenModel();
+  late SharedPreferences prefs;
+  BuildContext context;
+
+  LoginController(this.context);
+
+  void _showErrorSnackBar(String? message) {
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(message.toString()),
+          behavior: SnackBarBehavior.floating,
+          backgroundColor: Colors.deepOrange,
+        ),
+      );
+    });
+  }
+
+  Future<LoginScreenModel> login(String username, String password) async {
+    try {
+      model.isLoading = true;
+      notifyListeners();
+
+      prefs = await SharedPreferences.getInstance();
+
+      dynamic response = await http.post('/auth/login', {
+        'username': username,
+        'password': password,
+      });
+      logger.i(response.toString());
+
+      if (response.containsKey('token')) {
+        model.status = 'SUCCESS';
+
+        prefs.setString('token', response['token']);
+        prefs.setString('username', username);
+        prefs.setString('email', response['email']);
+        prefs.setString('firstName', response['firstName']);
+        prefs.setString('lastName', response['lastName']);
+        prefs.setString('phone', response['phone']);
+
+        return model;
+      } else {
+        model.errorMessage =
+            response['errorMessage'] ??
+            "Problem with the transaction. Please try again or contact support";
+        _showErrorSnackBar(model.errorMessage);
+      }
+    } on DioException catch (e, s) {
+      logger.e(s);
+      _showErrorSnackBar("Network error. Please try again or contact support");
+    } catch (e, s) {
+      logger.e(s);
+      _showErrorSnackBar(
+        "Problem processing that transaction. Please try again or contact support",
+      );
+    }
+
+    model.isLoading = false;
+    notifyListeners();
+
+    return model;
+  }
+}