second commit

lib/presentation/customer/providers/customer_providers.dart

@@ -0,0 +1,71 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../../app/providers.dart';
+import '../../../domain/entities/customer.dart';
+
+/// Outcome of the mobile-number lookup on the Existing Customer screen.
+sealed class CustomerLookupState {
+  const CustomerLookupState();
+}
+
+class LookupIdle extends CustomerLookupState {
+  const LookupIdle();
+}
+
+class LookupSearching extends CustomerLookupState {
+  const LookupSearching();
+}
+
+class LookupFound extends CustomerLookupState {
+  const LookupFound(this.customer);
+
+  final Customer customer;
+}
+
+class LookupNotFound extends CustomerLookupState {
+  const LookupNotFound(this.mobile);
+
+  final String mobile;
+}
+
+class LookupError extends CustomerLookupState {
+  const LookupError(this.message);
+
+  final String message;
+}
+
+class CustomerLookupController extends StateNotifier<CustomerLookupState> {
+  CustomerLookupController(this._ref) : super(const LookupIdle());
+
+  final Ref _ref;
+
+  Future<void> search(String mobile) async {
+    final digits = mobile.replaceAll(RegExp(r'\D'), '');
+    if (digits.length != 10) {
+      state = const LookupIdle();
+      return;
+    }
+
+    state = const LookupSearching();
+    try {
+      final customer =
+          await _ref.read(customerRepositoryProvider).findByMobile(digits);
+      state = customer != null
+          ? LookupFound(customer)
+          : LookupNotFound(digits);
+    } catch (e) {
+      state = LookupError(e.toString());
+    }
+  }
+
+  void reset() => state = const LookupIdle();
+}
+
+final customerLookupProvider =
+    StateNotifierProvider<CustomerLookupController, CustomerLookupState>(
+  (ref) => CustomerLookupController(ref),
+);
+
+final recentCustomersProvider = FutureProvider<List<Customer>>(
+  (ref) => ref.watch(customerRepositoryProvider).recent(limit: 6),
+);