import 'dart:convert';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_test/flutter_test.dart';

import 'package:hl_lieferservice/feature/feature_flags/feature.dart';
import 'package:hl_lieferservice/feature/feature_flags/feature_flags.dart';
import 'package:hl_lieferservice/feature/feature_flags/feature_gate.dart';

Map<String, dynamic> _asset() =>
    jsonDecode(File('assets/feature_flags.json').readAsStringSync())
        as Map<String, dynamic>;

void main() {
  group('assets/feature_flags.json', () {
    test('enthält jeden Feature-Key genau so, wie er im Code steht', () {
      final keys = (_asset()['features'] as Map<String, dynamic>).keys.toSet();
      for (final f in Feature.values) {
        expect(keys, contains(f.key), reason: 'Key fehlt: ${f.key}');
      }
    });

    test('Gutschriften-Abschnitt ist aktuell deaktiviert', () {
      final flags = FeatureFlags.fromJson(_asset());
      expect(flags.isEnabled(Feature.articlesCreditSection), isFalse);
    });
  });

  group('FeatureFlags.fromJson', () {
    test('fehlender Key fällt auf den Default zurück', () {
      final flags = FeatureFlags.fromJson({'features': <String, dynamic>{}});
      for (final f in Feature.values) {
        expect(flags.isEnabled(f), f.defaultEnabled);
      }
    });

    test('unbekannte Keys werden ignoriert', () {
      final flags = FeatureFlags.fromJson({
        'features': {
          'gibt.es.nicht': {'enabled': true},
          'articles.credit_section': {'enabled': false},
        },
      });
      expect(flags.isEnabled(Feature.articlesCreditSection), isFalse);
    });

    test('kein bool bei enabled ist ein Fehler', () {
      expect(
        () => FeatureFlags.fromJson({
          'features': {
            'articles.credit_section': {'enabled': 'nein'},
          },
        }),
        throwsFormatException,
      );
    });
  });

  group('FeatureGate', () {
    Future<void> pumpGate(WidgetTester tester, {required bool enabled}) {
      return tester.pumpWidget(
        RepositoryProvider.value(
          value: FeatureFlags({Feature.articlesCreditSection.key: enabled}),
          child: const MaterialApp(
            home: FeatureGate(
              feature: Feature.articlesCreditSection,
              child: Text('Gutschriften'),
            ),
          ),
        ),
      );
    }

    testWidgets('zeigt den Inhalt bei aktivem Feature', (tester) async {
      await pumpGate(tester, enabled: true);
      expect(find.text('Gutschriften'), findsOneWidget);
    });

    testWidgets('blendet den Inhalt bei inaktivem Feature aus', (tester) async {
      await pumpGate(tester, enabled: false);
      expect(find.text('Gutschriften'), findsNothing);
    });
  });
}