progress on home page

lib/screens/pay/pay_controller.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:qpay/http/http.dart';
+import 'package:qpay/screens/home/home_controller.dart' as hc;
+
+part 'pay_controller.freezed.dart';
+part 'pay_controller.g.dart';
+
+class PayScreenModel {
+  List<BillProduct> products = [];
+  late BillProduct selectedProduct;
+  dynamic formData = {};
+  bool isLoading = false;
+  String? errorMessage;
+}
+
+@freezed
+abstract class BillProduct with _$BillProduct {
+  const factory BillProduct({
+    required String uid,
+    required String name,
+    required String description,
+    required String displayName,
+    required double defaultAmount,
+    required bool requiresAmount,
+  }) = _BillProduct;
+
+  factory BillProduct.fromJson(Map<String, dynamic> json) =>
+      _$BillProductFromJson(json);
+}
+
+class PayController extends ChangeNotifier {
+  final PayScreenModel model = PayScreenModel();
+  final Http http = Http();
+
+  void updateSelectedProduct(BillProduct product) {
+    model.selectedProduct = product;
+    notifyListeners();
+  }
+
+  Future<void> getProducts(String providerId) async {
+    try {
+      model.isLoading = true;
+
+      List<dynamic> response = await http.get(
+        '/providers/$providerId/products',
+      );
+      model.products = response.map((e) => BillProduct.fromJson(e)).toList();
+    } catch (e) {
+      logger.e(e);
+      model.errorMessage = e.toString();
+    }
+
+    model.isLoading = false;
+    notifyListeners();
+  }
+
+}