import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:nearle_pos/core/widgets/primary_button.dart';
import 'package:nearle_pos/core/widgets/status_pill.dart';
import 'package:nearle_pos/domain/entities/customer.dart';

Widget _host(Widget child) => MaterialApp(
      home: Scaffold(body: Center(child: child)),
    );

void main() {
  group('PrimaryButton', () {
    testWidgets('renders its label', (tester) async {
      await tester.pumpWidget(
        _host(PrimaryButton(label: 'Charge', onPressed: () {})),
      );

      expect(find.text('Charge'), findsOneWidget);
    });

    testWidgets('fires onPressed when tapped', (tester) async {
      var taps = 0;
      await tester.pumpWidget(
        _host(PrimaryButton(label: 'Charge', onPressed: () => taps++)),
      );

      await tester.tap(find.text('Charge'));
      await tester.pump();

      expect(taps, 1);
    });

    testWidgets('does nothing when onPressed is null', (tester) async {
      await tester.pumpWidget(
        _host(const PrimaryButton(label: 'Charge')),
      );

      await tester.tap(find.text('Charge'), warnIfMissed: false);
      await tester.pump();

      expect(find.text('Charge'), findsOneWidget);
    });

    testWidgets('shows a spinner instead of the label while busy',
        (tester) async {
      await tester.pumpWidget(
        _host(PrimaryButton(label: 'Charge', busy: true, onPressed: () {})),
      );

      expect(find.byType(CircularProgressIndicator), findsOneWidget);
      expect(find.text('Charge'), findsNothing);
    });

    testWidgets('renders a trailing total alongside the label',
        (tester) async {
      await tester.pumpWidget(
        _host(PrimaryButton(
          label: 'CHARGE',
          onPressed: () {},
          trailing: const Text('\u20B9384.00'),
        ),),
      );

      expect(find.text('CHARGE'), findsOneWidget);
      expect(find.text('\u20B9384.00'), findsOneWidget);
    });
  });

  group('StatusPill', () {
    testWidgets('labels a membership tier', (tester) async {
      await tester.pumpWidget(_host(StatusPill.tier(MembershipTier.silver)));
      expect(find.text('SILVER'), findsOneWidget);
    });

    testWidgets('reports an out-of-stock product', (tester) async {
      await tester.pumpWidget(
        _host(StatusPill.stock(0, lowThreshold: 10)),
      );
      expect(find.text('Out of stock'), findsOneWidget);
    });

    testWidgets('warns when stock is low', (tester) async {
      await tester.pumpWidget(
        _host(StatusPill.stock(4, lowThreshold: 10)),
      );
      expect(find.text('4 left'), findsOneWidget);
    });
  });
}