import 'package:drift/drift.dart' show driftRuntimeOptions;
import 'package:drift/native.dart';
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/data/database.dart';
import 'package:rippr/src/data/trip_repository.dart';
import 'package:rippr/src/domain/models.dart';
import 'package:rippr/src/ui/activity_display.dart';
import 'package:rippr/src/recording/location_source.dart';
import 'package:rippr/src/ui/detail/trip_detail_screen.dart';
import 'package:rippr/src/ui/record/record_screen.dart';
import 'package:rippr/src/ui/theme.dart';
import 'package:rippr/src/ui/trips/trips_screen.dart';

/// **The first UI tests this project has ever had.**
///
/// `docs/v3/BACKLOG.md` names "zero UI tests across six screens" as v2's largest coverage
/// gap: everything was verified by manual screenshot, which is how a 64 sp speed figure
/// once shipped rendering black-on-black. Flutter makes these cheap enough that carrying
/// that debt into the port would be indefensible.
void main() {
  late AppDatabase db;
  late TripRepository repo;
  late FakeLocationSource source;

  setUp(() {
    driftRuntimeOptions.dontWarnAboutMultipleDatabases = true;
    db = AppDatabase(NativeDatabase.memory());
    repo = TripRepository(db);
    source = FakeLocationSource();
  });

  tearDown(() async {
    await source.dispose();
    await db.close();
  });

  /// Runs a widget test and then tears the tree down cleanly.
  ///
  /// `flutter_test` asserts that no `Timer` is pending once the tree is disposed. Two
  /// things here legitimately hold one: the elapsed clock on the record screen, and
  /// Drift's stream-query cache, which keeps a query alive briefly after its last
  /// listener leaves so re-subscribing is cheap. Removing the tree cancels the first;
  /// pumping past the keep-alive window clears the second.
  void screenTest(String description, Future<void> Function(WidgetTester) body) {
    testWidgets(description, (tester) async {
      await body(tester);
      await tester.pumpWidget(const SizedBox.shrink());
      await tester.pump(const Duration(seconds: 2));
    });
  }

  /// Pumps a screen that has a live ride on it.
  ///
  /// `pumpAndSettle` cannot be used once a ride is active: the elapsed clock ticks every
  /// second forever, so "settled" never arrives. Two explicit frames are enough to build
  /// and then reflect the streamed trip.
  Future<void> pumpLive(WidgetTester tester, Widget widget) async {
    await tester.pumpWidget(widget);
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 50));
  }

  /// Wraps a screen with the real theme and an in-memory stack.
  ///
  /// The theme is deliberately included: the black-on-black bug was invisible to logic
  /// tests and only a rendered widget can catch its equivalent.
  Widget host(Widget child, {bool map = true}) => ProviderScope(
        overrides: [
          databaseProvider.overrideWithValue(db),
          locationSourceProvider.overrideWithValue(source),
          // The map is off by default in tests that are not about the map: it fetches
          // tiles, which a widget test cannot serve, and it changes scroll geometry.
          mapEnabledProvider.overrideWith((ref) => map),
        ],
        child: MaterialApp(theme: ripprTheme(), home: child),
      );

  Future<int> seedCompletedTrip({
    required int startedAt,
    required int endedAt,
    String? name,
    int points = 5,
    double startLat = 51.0,
  }) async {
    final h = await repo.startTrip(startedAt);
    await repo.appendPoints([
      for (var i = 0; i < points; i++)
        TrackPoint(
          tripId: h.tripId,
          segmentId: h.segmentId,
          timestamp: startedAt + i * 1000,
          latitude: startLat + i * 0.0001,
          longitude: -114.0,
          speedKmh: 40.0 + i,
          altitudeM: 1000.0 + i,
        ),
    ]);
    if (name != null) await repo.renameTrip(h.tripId, name);
    await repo.completeTrip(endedAt);
    await repo.recomputeAggregates(h.tripId);
    return h.tripId;
  }

  group('record screen', () {
    screenTest('idle shows Ready and only START', (tester) async {
      await tester.pumpWidget(host(const RecordScreen()));
      await tester.pumpAndSettle();

      expect(find.text('Ready'), findsOneWidget);
      expect(find.byKey(const Key('start')), findsOneWidget);
      expect(find.byKey(const Key('pause')), findsNothing);
      expect(find.byKey(const Key('stop')), findsNothing);
      // A resting screen must not look like a ride going nowhere.
      expect(find.text('Distance'), findsNothing);
    });

    screenTest('the headline is live speed, not max speed', (tester) async {
      // v2.0 shipped max speed as the headline and it read as a frozen, broken screen on
      // a real ride, because a max figure only moves when you beat it. This guards the
      // 2.0.1 fix.
      await tester.pumpWidget(host(const RecordScreen()));
      await tester.pumpAndSettle();

      expect(find.text('SPEED'), findsOneWidget);
      expect(find.text('MAX SPEED'), findsNothing);
    });

    screenTest('recording swaps to PAUSE and STOP, with no DISCARD',
        (tester) async {
      await repo.startTrip(1000);
      await pumpLive(tester, host(const RecordScreen()));

      expect(find.byKey(const Key('pause')), findsOneWidget);
      expect(find.byKey(const Key('stop')), findsOneWidget);
      // Destructive actions must not sit next to Pause during a live ride — a gloved
      // mis-tap at speed would lose the whole recording.
      expect(find.byKey(const Key('discard')), findsNothing);
      expect(find.byKey(const Key('start')), findsNothing);
    });

    screenTest('paused offers RESUME, STOP and DISCARD', (tester) async {
      await repo.startTrip(1000);
      await repo.pauseTrip(2000);
      await pumpLive(tester, host(const RecordScreen()));

      expect(find.byKey(const Key('resume')), findsOneWidget);
      expect(find.byKey(const Key('stop')), findsOneWidget);
      expect(find.byKey(const Key('discard')), findsOneWidget);
      expect(find.text('Paused'), findsOneWidget);
    });

    screenTest('discard asks before destroying anything', (tester) async {
      await repo.startTrip(1000);
      await repo.pauseTrip(2000);
      await pumpLive(tester, host(const RecordScreen()));

      await tester.tap(find.byKey(const Key('discard')));
      await tester.pumpAndSettle();

      expect(find.text('Discard this ride?'), findsOneWidget);

      await tester.tap(find.text('Cancel'));
      await tester.pumpAndSettle();

      expect(await repo.activeTrip(), isNotNull,
          reason: 'cancelling must not delete the ride');
    });

    screenTest('text is legible against the dark ground', (tester) async {
      // The regression this exists for: removing Compose's Surface left LocalContentColor
      // black, and a 64sp figure rendered invisibly on a near-black background. No logic
      // test could catch it. This asserts the rendered colour differs from the ground.
      await tester.pumpWidget(host(const RecordScreen()));
      await tester.pumpAndSettle();

      final speed = tester.widget<Text>(
        find.descendant(
          of: find.byKey(const Key('speed')),
          matching: find.text('0'),
        ),
      );
      final colour = speed.style?.color;
      expect(colour, isNotNull, reason: 'the headline must name its colour');
      expect(colour, isNot(ripprBackground));
      expect(colour, isNot(Colors.black));
    });
  });

  group('trips list', () {
    screenTest('empty state explains what to do', (tester) async {
      await tester.pumpWidget(host(const TripsScreen()));
      await tester.pumpAndSettle();

      expect(find.textContaining('No rides yet'), findsOneWidget);
    });

    screenTest('completed rides are listed newest first', (tester) async {
      await seedCompletedTrip(
          startedAt: 1000, endedAt: 5000, name: 'Older ride');
      await seedCompletedTrip(
          startedAt: 100000, endedAt: 200000, name: 'Newer ride');

      await tester.pumpWidget(host(const TripsScreen()));
      await tester.pumpAndSettle();

      final newer = tester.getTopLeft(find.text('Newer ride')).dy;
      final older = tester.getTopLeft(find.text('Older ride')).dy;
      expect(newer, lessThan(older));
    });

    screenTest('an active ride does not appear in the list', (tester) async {
      await seedCompletedTrip(
          startedAt: 1000, endedAt: 5000, name: 'Finished');
      await repo.startTrip(100000);

      await tester.pumpWidget(host(const TripsScreen()));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 50));

      expect(find.byKey(const Key('trip-1')), findsOneWidget);
      expect(find.text('Finished'), findsOneWidget);
      // Only the completed one.
      expect(find.byType(Card), findsOneWidget);
    });

    screenTest('Merge enables at exactly two selections', (tester) async {
      final a = await seedCompletedTrip(startedAt: 1000, endedAt: 5000);
      final b = await seedCompletedTrip(startedAt: 10000, endedAt: 15000);
      final c = await seedCompletedTrip(startedAt: 20000, endedAt: 25000);

      await tester.pumpWidget(host(const TripsScreen()));
      await tester.pumpAndSettle();

      // One selected: merge is present but disabled.
      await tester.longPress(find.byKey(Key('trip-$a')));
      await tester.pumpAndSettle();
      expect(
        tester.widget<TextButton>(find.byKey(const Key('merge'))).onPressed,
        isNull,
        reason: 'merging one ride is meaningless',
      );

      // Two: enabled.
      await tester.tap(find.byKey(Key('trip-$b')));
      await tester.pumpAndSettle();
      expect(
        tester.widget<TextButton>(find.byKey(const Key('merge'))).onPressed,
        isNotNull,
      );

      // Three: ambiguous, so disabled again.
      await tester.tap(find.byKey(Key('trip-$c')));
      await tester.pumpAndSettle();
      expect(
        tester.widget<TextButton>(find.byKey(const Key('merge'))).onPressed,
        isNull,
        reason: 'merge combines exactly two rides',
      );
    });

    screenTest('deleting asks first and then removes the ride',
        (tester) async {
      final a = await seedCompletedTrip(startedAt: 1000, endedAt: 5000);

      await tester.pumpWidget(host(const TripsScreen()));
      await tester.pumpAndSettle();

      await tester.longPress(find.byKey(Key('trip-$a')));
      await tester.pumpAndSettle();
      await tester.tap(find.byKey(const Key('delete')));
      await tester.pumpAndSettle();

      expect(find.textContaining('Delete 1 ride'), findsOneWidget);
      // "Delete" appears both in the toolbar and in the dialog; target the dialog's.
      await tester.tap(find.descendant(
        of: find.byType(AlertDialog),
        matching: find.text('Delete'),
      ));
      await tester.pumpAndSettle();

      expect(await repo.tripById(a), isNull);
    });

    screenTest('a tile shows its own activity icon (V3-01)', (tester) async {
      final motorcycleTrip =
          await seedCompletedTrip(startedAt: 1000, endedAt: 5000, name: 'Ride');
      final bikeTrip =
          await seedCompletedTrip(startedAt: 10000, endedAt: 15000, name: 'Bike');
      await repo.setActivity(bikeTrip, Activity.bicycle);

      await tester.pumpWidget(host(const TripsScreen()));
      await tester.pumpAndSettle();

      Icon iconFor(int tripId) => tester.widget<Icon>(
            find.descendant(
              of: find.byKey(Key('trip-$tripId')),
              matching: find.byType(Icon),
            ),
          );

      expect(iconFor(motorcycleTrip).icon, activityIcon(Activity.motorcycle));
      expect(iconFor(bikeTrip).icon, activityIcon(Activity.bicycle));
    });
  });

  group('trip detail', () {
    screenTest('shows the authoritative summary', (tester) async {
      final id = await seedCompletedTrip(
          startedAt: 1000, endedAt: 5000, name: 'Sunday blast', points: 11);

      await tester.pumpWidget(host(TripDetailScreen(tripId: id), map: false));
      await tester.pumpAndSettle();

      expect(find.text('Sunday blast'), findsOneWidget);
      expect(find.text('DISTANCE'), findsOneWidget);
      expect(find.text('Max speed'), findsOneWidget);
      expect(find.text('Segments'), findsOneWidget);
    });

    screenTest('a missing ride says so instead of rendering blank',
        (tester) async {
      await tester.pumpWidget(host(const TripDetailScreen(tripId: 9999), map: false));
      await tester.pumpAndSettle();

      expect(find.textContaining('no longer exists'), findsOneWidget);
    });

    screenTest('charts degrade gracefully below two points', (tester) async {
      final id = await seedCompletedTrip(
          startedAt: 1000, endedAt: 2000, points: 1);

      await tester.pumpWidget(host(TripDetailScreen(tripId: id), map: false));
      await tester.pumpAndSettle();

      // Both charts need intervals; one point has none. An unexplained blank box would
      // read as a bug.
      //
      // The detail body is a ListView, so the second chart is not built until it is
      // scrolled into view -- asserting without scrolling would silently check only one.
      expect(find.textContaining('Not enough points'), findsOneWidget);
      await tester.drag(find.byType(ListView), const Offset(0, -600));
      await tester.pumpAndSettle();
      expect(find.textContaining('Not enough points'), findsWidgets);
      expect(find.text('Elevation profile'.toUpperCase()), findsOneWidget);
    });

    screenTest('renaming updates the title', (tester) async {
      final id = await seedCompletedTrip(startedAt: 1000, endedAt: 5000);

      await tester.pumpWidget(host(TripDetailScreen(tripId: id), map: false));
      await tester.pumpAndSettle();

      await tester.tap(find.byKey(const Key('rename')));
      await tester.pumpAndSettle();
      await tester.enterText(find.byKey(const Key('name-field')), 'Coast run');
      await tester.tap(find.text('Save'));
      await tester.pumpAndSettle();

      expect(find.text('Coast run'), findsOneWidget);
      expect((await repo.tripById(id))!.name, 'Coast run');
    });

    screenTest('editing the activity updates the row and recomputes aggregates',
        (tester) async {
      final id = await seedCompletedTrip(startedAt: 1000, endedAt: 5000);

      await tester.pumpWidget(host(TripDetailScreen(tripId: id), map: false));
      await tester.pumpAndSettle();

      expect(find.text(activityLabel(Activity.motorcycle)), findsOneWidget);

      await tester.tap(find.byKey(const Key('activity-row')));
      await tester.pumpAndSettle();
      await tester.tap(find.byKey(Key('activity-${Activity.walking.name}')));
      await tester.pumpAndSettle();

      expect(find.text(activityLabel(Activity.walking)), findsOneWidget);
      expect((await repo.tripById(id))!.activity, Activity.walking);
    });
  });
}