import 'dart:async';

import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:spotiflac_android/models/settings.dart';
import 'package:spotiflac_android/providers/settings_provider.dart';
import 'package:spotiflac_android/providers/track_provider.dart';
import 'package:spotiflac_android/services/platform_bridge.dart';
import 'package:spotiflac_android/utils/extension_auth_launcher.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  const channel = MethodChannel('plugins.flutter.io/url_launcher');
  const backend = MethodChannel('com.zarz.spotiflac/backend');
  final messenger =
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger;
  final uri = Uri.parse('https://example.invalid/verify?state=sample');

  tearDown(() {
    messenger.setMockMethodCallHandler(channel, null);
    messenger.setMockMethodCallHandler(backend, null);
  });

  for (final inAppFirst in [true, false]) {
    final browserMode = inAppFirst ? 'in_app_first' : 'external_first';
    for (final throwsError in [true, false]) {
      test(
        'browser fallback after launch failure: $browserMode, throws=$throwsError',
        () async {
          final modes = <bool>[];
          messenger.setMockMethodCallHandler(channel, (call) async {
            expect(call.method, 'launch');
            final arguments = Map<String, dynamic>.from(call.arguments as Map);
            expect(arguments['url'], uri.toString());
            modes.add(arguments['useWebView'] as bool);
            if (modes.length == 1) {
              if (throwsError) {
                throw PlatformException(code: 'ACTIVITY_NOT_FOUND');
              }
              return false;
            }
            return true;
          });
          expect(
            await launchExtensionAuthUrl(uri, browserMode: browserMode),
            isTrue,
          );
          expect(modes, [inAppFirst, !inAppFirst]);
        },
      );
    }
  }

  test(
    'both browser failures return false so manual help can be shown',
    () async {
      var launches = 0;
      messenger.setMockMethodCallHandler(channel, (_) async {
        launches++;
        throw PlatformException(code: 'ACTIVITY_NOT_FOUND');
      });
      expect(
        await launchExtensionAuthUrl(uri, browserMode: 'in_app_first'),
        isFalse,
      );
      expect(launches, 2);
    },
  );

  test(
    'direct search verifies through the fallback browser and retries once',
    () async {
      var searches = 0;
      var pendingLookups = 0;
      var launches = 0;
      messenger.setMockMethodCallHandler(backend, (call) async {
        switch (call.method) {
          case 'customSearchWithExtension':
            searches++;
            if (searches == 1) {
              throw PlatformException(
                code: 'ERROR',
                message:
                    "verification_required: extension 'sample-provider' needs signed-session verification: Error: VERIFY_REQUIRED",
              );
            }
            return [
              {
                'id': 'sample-track',
                'name': 'Sample track',
                'artist_name': 'Artist',
              },
            ];
          case 'getExtensionPendingAuth':
            pendingLookups++;
            expect(call.arguments, {'extension_id': 'sample-provider'});
            return {'auth_url': uri.toString()};
          case 'completeExtensionSessionGrant':
            return true;
          default:
            fail('Unexpected backend call: ${call.method}');
        }
      });
      messenger.setMockMethodCallHandler(channel, (call) async {
        launches++;
        if (launches == 1) throw PlatformException(code: 'ACTIVITY_NOT_FOUND');
        unawaited(
          PlatformBridge.completeExtensionSessionGrant(
            'sample-provider',
            'test-grant',
          ),
        );
        return true;
      });
      final container = ProviderContainer(
        overrides: [settingsProvider.overrideWith(_Settings.new)],
      );
      addTearDown(container.dispose);
      await container
          .read(trackProvider.notifier)
          .customSearch('sample-provider', 'fallback verification');
      final state = container.read(trackProvider);
      expect(state.error, isNull);
      expect(state.isLoading, isFalse);
      expect(state.tracks.single.id, 'sample-track');
      expect(searches, 2);
      expect(pendingLookups, 1);
      expect(launches, 2);
    },
  );
}

class _Settings extends SettingsNotifier {
  @override
  AppSettings build() => const AppSettings();
}