import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:rippr/src/app/providers.dart';
import 'package:rippr/src/config/config.dart';
import 'package:rippr/src/domain/models.dart';
import 'package:rippr/src/ui/settings/settings_screen.dart';
import 'package:rippr/src/ui/theme.dart';
import 'package:shared_preferences/shared_preferences.dart';

/// V3-02: every `Config` value must be viewable and editable here, and every write must
/// actually reach `Config` -- not just update local widget state that looks right until
/// the next app launch.
void main() {
  late Config config;

  setUp(() async {
    SharedPreferences.setMockInitialValues({});
    config = await Config.load();
  });

  Widget host() => ProviderScope(
        overrides: [configProvider.overrideWith((ref) => config)],
        child: MaterialApp(theme: ripprTheme(), home: const SettingsScreen()),
      );

  testWidgets('the map switch reflects and writes through to Config', (tester) async {
    await tester.pumpWidget(host());
    await tester.pumpAndSettle();

    final initial = tester
        .widget<SwitchListTile>(find.byKey(const Key('map-enabled-switch')))
        .value;
    expect(initial, isTrue, reason: 'Config.mapEnabled defaults to true');

    await tester.tap(find.byKey(const Key('map-enabled-switch')));
    await tester.pumpAndSettle();

    expect(config.mapEnabled, isFalse,
        reason: 'the switch must write through to Config, not just local state');
  });

  testWidgets('changing the map switch is visible to other providers immediately',
      (tester) async {
    // V3-02's acceptance criterion: "changing the map toggle takes effect without an
    // app restart". mapEnabledProvider is what trip detail actually reads.
    await tester.pumpWidget(host());
    await tester.pumpAndSettle();

    final container = ProviderScope.containerOf(
      tester.element(find.byType(SettingsScreen)),
    );
    expect(container.read(mapEnabledProvider), isTrue);

    await tester.tap(find.byKey(const Key('map-enabled-switch')));
    await tester.pumpAndSettle();

    expect(container.read(mapEnabledProvider), isFalse);
  });

  testWidgets('the unit selector writes through to Config', (tester) async {
    // The default depends on the test runner's own locale (see config_test.dart), so
    // start from an explicit, known value rather than assuming metric.
    await config.setUnitSystem(UnitSystem.metric);
    await tester.pumpWidget(host());
    await tester.pumpAndSettle();

    await tester.tap(find.text('Imperial'));
    await tester.pumpAndSettle();
    expect(config.unitSystem, UnitSystem.imperial);

    await tester.tap(find.text('Metric'));
    await tester.pumpAndSettle();
    expect(config.unitSystem, UnitSystem.metric);
  });

  testWidgets('the mounted mode switch writes through to Config (V3-05)',
      (tester) async {
    await tester.pumpWidget(host());
    await tester.pumpAndSettle();

    final initial = tester
        .widget<SwitchListTile>(find.byKey(const Key('mounted-mode-switch')))
        .value;
    expect(initial, isFalse, reason: 'a pocketed ride is still the common case');

    await tester.tap(find.byKey(const Key('mounted-mode-switch')));
    await tester.pumpAndSettle();

    expect(config.mountedMode, isTrue);
  });

  group('upload endpoint', () {
    testWidgets('a valid https URL is saved', (tester) async {
      await tester.pumpWidget(host());
      await tester.pumpAndSettle();

      await tester.enterText(
        find.byKey(const Key('endpoint-field')),
        'https://example.test/ingest',
      );
      await tester.tap(find.byKey(const Key('save-endpoint')));
      await tester.pumpAndSettle();

      expect(config.uploadEndpoint, 'https://example.test/ingest');
      expect(find.text('Endpoint saved'), findsOneWidget);
    });

    testWidgets('an invalid endpoint is rejected with a readable message, not '
        'silently stored', (tester) async {
      await tester.pumpWidget(host());
      await tester.pumpAndSettle();

      await tester.enterText(
        find.byKey(const Key('endpoint-field')),
        'not a url at all',
      );
      await tester.tap(find.byKey(const Key('save-endpoint')));
      await tester.pumpAndSettle();

      expect(config.uploadEndpoint, '',
          reason: 'garbage input must never reach storage');
      expect(find.textContaining('http'), findsWidgets);
    });

    testWidgets('a non-http scheme is rejected', (tester) async {
      await tester.pumpWidget(host());
      await tester.pumpAndSettle();

      await tester.enterText(
        find.byKey(const Key('endpoint-field')),
        'ftp://example.test/ingest',
      );
      await tester.tap(find.byKey(const Key('save-endpoint')));
      await tester.pumpAndSettle();

      expect(config.uploadEndpoint, '');
    });

    testWidgets('clearing the endpoint is a valid way to disable upload',
        (tester) async {
      await config.setUploadEndpoint('https://example.test/ingest');
      await tester.pumpWidget(host());
      await tester.pumpAndSettle();

      await tester.enterText(find.byKey(const Key('endpoint-field')), '');
      await tester.tap(find.byKey(const Key('save-endpoint')));
      await tester.pumpAndSettle();

      expect(config.uploadEndpoint, '');
      expect(find.text('Upload disabled'), findsOneWidget);
    });
  });

  testWidgets('the device id is shown and a copy control exists', (tester) async {
    await tester.pumpWidget(host());
    await tester.pumpAndSettle();

    expect(find.text(config.deviceId), findsOneWidget);
    expect(find.byKey(const Key('copy-device-id')), findsOneWidget);

    // The list has grown past one screen (V3-05 added a section above this), so the
    // control is not necessarily within the default test viewport.
    await tester.drag(find.byType(ListView).first, const Offset(0, -400));
    await tester.pumpAndSettle();
    // Tapping must not throw even though no real clipboard exists in the test harness.
    await tester.tap(find.byKey(const Key('copy-device-id')));
    await tester.pumpAndSettle();
    expect(tester.takeException(), isNull);
  });

  testWidgets('shows a spinner rather than crashing while Config is still loading',
      (tester) async {
    await tester.pumpWidget(
      const ProviderScope(
        child: MaterialApp(home: SettingsScreen()),
      ),
    );
    await tester.pump();

    expect(find.byType(CircularProgressIndicator), findsOneWidget);
    expect(tester.takeException(), isNull);
  });
}