import 'package:drift/drift.dart' show driftRuntimeOptions;
import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:rippr/src/data/database.dart';
import 'package:rippr/src/data/trip_repository.dart';
import 'package:rippr/src/domain/activity_profile.dart';
import 'package:rippr/src/domain/models.dart';

/// Ported from `com.rippr.data.TripRepositoryTest` and `MergeTest`.
///
/// Both were **instrumented** suites needing a device and a booted emulator. Against
/// Drift on the Dart VM they are ordinary unit tests.
///
/// In-memory databases only — the native suite once wiped a real device's rides by
/// running against the production singleton.
void main() {
  late AppDatabase db;
  late TripRepository repo;

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

  tearDown(() async => db.close());

  Future<void> addPoint(TripHandle handle, int ts,
          {double lat = 51.0, double speed = 40.0, double alt = 1000.0}) =>
      repo.appendPoints([
        TrackPoint(
          tripId: handle.tripId,
          segmentId: handle.segmentId,
          timestamp: ts,
          latitude: lat,
          longitude: -114.0,
          speedKmh: speed,
          altitudeM: alt,
        ),
      ]);

  group('lifecycle', () {
    test('full lifecycle produces one trip and two segments', () async {
      final h1 = await repo.startTrip(1000);
      await addPoint(h1, 1000);
      await addPoint(h1, 2000);

      await repo.pauseTrip(3000);
      final h2 = (await repo.resumeTrip(4000))!;
      await addPoint(h2, 5000);

      final tripId = await repo.completeTrip(6000);

      expect(tripId, h1.tripId);
      expect(h2.segmentId, isNot(h1.segmentId),
          reason: 'resume must open a fresh segment');

      final segments = await repo.segmentsForTrip(h1.tripId);
      expect(segments.length, 2);
      expect(segments.every((s) => !s.isOpen), isTrue,
          reason: 'completing must close the open segment');
      expect((await repo.tripById(h1.tripId))!.state, TripState.completed);
      expect(await repo.activeTrip(), isNull);
    });

    test('pause closes the segment but leaves the trip open', () async {
      final h = await repo.startTrip(1000);
      await repo.pauseTrip(2000);

      final trip = (await repo.activeTrip())!;
      expect(trip.state, TripState.paused);
      expect(trip.endedAt, isNull, reason: 'pause must not end the trip');
      expect(await db.openSegment(h.tripId), isNull);
    });

    test('startTrip adopts an already active trip instead of creating a second',
        () async {
      final first = await repo.startTrip(1000);
      final second = await repo.startTrip(2000);

      expect(second.tripId, first.tripId);
      expect(second.segmentId, first.segmentId);
      expect(await db.countTrips(), 1);
    });

    test('resume while already recording is a no-op', () async {
      final h = await repo.startTrip(1000);
      final resumed = await repo.resumeTrip(2000);

      expect(resumed!.segmentId, h.segmentId,
          reason: 'must not open a duplicate segment');
      expect(await db.countSegmentsForTrip(h.tripId), 1);
    });

    test('double pause is a no-op', () async {
      final h = await repo.startTrip(1000);
      expect(await repo.pauseTrip(2000), isTrue);
      expect(await repo.pauseTrip(3000), isTrue);
      expect(await db.countSegmentsForTrip(h.tripId), 1);
    });

    test('transitions with no active trip are safe no-ops', () async {
      expect(await repo.pauseTrip(1000), isFalse);
      expect(await repo.resumeTrip(1000), isNull);
      expect(await repo.completeTrip(1000), isNull);
      expect(await repo.discardTrip(), isFalse);
    });

    test('start after complete begins a fresh trip', () async {
      final first = await repo.startTrip(1000);
      await repo.completeTrip(2000);
      final second = await repo.startTrip(3000);

      expect(second.tripId, isNot(first.tripId));
      expect(await db.countTrips(), 2);
    });
  });

  group('discard', () {
    test('discard removes the trip and all its points', () async {
      final h = await repo.startTrip(1000);
      await addPoint(h, 1000);
      await addPoint(h, 2000);

      expect(await repo.discardTrip(), isTrue);

      expect(await repo.tripById(h.tripId), isNull);
      expect(await db.countPointsForTrip(h.tripId), 0);
      expect(await db.countSegmentsForTrip(h.tripId), 0);
    });

    test('discard leaves earlier completed trips alone', () async {
      final keep = await repo.startTrip(1000);
      await addPoint(keep, 1000);
      await repo.completeTrip(2000);

      final throwaway = await repo.startTrip(3000);
      await addPoint(throwaway, 3000);
      await repo.discardTrip();

      expect(await repo.tripById(keep.tripId), isNotNull);
      expect(await db.countPointsForTrip(keep.tripId), 1);
      expect(await db.countTrips(), 1);
    });
  });

  group('streams', () {
    test('active trip stream tracks the lifecycle', () async {
      expect(await repo.watchActiveTrip().first, isNull);

      final h = await repo.startTrip(1000);
      expect((await repo.watchActiveTrip().first)?.id, h.tripId);

      await repo.completeTrip(2000);
      expect(await repo.watchActiveTrip().first, isNull);
    });

    test('completed trips stream excludes the active trip', () async {
      final done = await repo.startTrip(1000);
      await repo.completeTrip(2000);
      await repo.startTrip(3000);

      final completed = await repo.watchCompletedTrips().first;
      expect(completed.length, 1);
      expect(completed.single.id, done.tripId);
    });
  });

  group('rename', () {
    test('rename stores null rather than an empty string', () async {
      final h = await repo.startTrip(1000);

      await repo.renameTrip(h.tripId, 'Morning loop');
      expect((await repo.tripById(h.tripId))!.name, 'Morning loop');

      await repo.renameTrip(h.tripId, '');
      expect((await repo.tripById(h.tripId))!.name, isNull,
          reason: 'an empty string would diverge from the date-label branch');

      await repo.renameTrip(h.tripId, '   ');
      expect((await repo.tripById(h.tripId))!.name, isNull);
    });

    test('rename trims surrounding whitespace', () async {
      final h = await repo.startTrip(1000);
      await repo.renameTrip(h.tripId, '  Sunday blast  ');
      expect((await repo.tripById(h.tripId))!.name, 'Sunday blast');
    });
  });

  // ---------------------------------------------------------------------------
  // Activity type — V3-01
  // ---------------------------------------------------------------------------

  group('activity', () {
    test('a brand new database defaults a fresh trip to motorcycle', () async {
      final h = await repo.startTrip(1000);
      expect((await repo.tripById(h.tripId))!.activity, Activity.motorcycle);
    });

    test('starting a new trip defaults to whatever activity was last used, '
        'with no picker required', () async {
      final first = await repo.startTrip(1000);
      await repo.completeTrip(2000);
      await repo.setActivity(first.tripId, Activity.walking);

      final second = await repo.startTrip(3000);

      expect((await repo.tripById(second.tripId))!.activity, Activity.walking,
          reason: 'the new ride should inherit the most recently created trip\'s '
              'activity, not silently reset to motorcycle');
    });

    test('an explicit activity overrides the last-used default', () async {
      final h = await repo.startTrip(1000, activity: Activity.bicycle);
      expect((await repo.tripById(h.tripId))!.activity, Activity.bicycle);
    });

    test('resuming an active trip never changes its activity', () async {
      final h = await repo.startTrip(1000, activity: Activity.running);
      await repo.pauseTrip(2000);
      // Started again with no explicit activity -- must adopt the paused trip's own,
      // not fall back to whatever "last used" would otherwise resolve to.
      final resumed = await repo.startTrip(3000);

      expect(resumed.tripId, h.tripId);
      expect((await repo.tripById(h.tripId))!.activity, Activity.running);
    });

    test('setActivity recomputes aggregates under the new profile', () async {
      // A slow walking pace: under the motorcycle noise floor (1.5 km/h) but above
      // walking's own (0.3), so moving time genuinely differs between the two profiles.
      final h = await repo.startTrip(1000, activity: Activity.motorcycle);
      for (var i = 0; i < 10; i++) {
        await addPoint(h, 1000 + i * 1000, speed: 0.7);
      }
      await repo.completeTrip(11000);
      // completeTrip() alone does not recompute aggregates -- the recorder does that
      // separately on stop(). Mirror that here rather than relying on a leftover value.
      await repo.recomputeAggregates(h.tripId);

      final asMotorcycle = (await repo.tripById(h.tripId))!;
      expect(asMotorcycle.movingMillis, 0,
          reason: 'a motorcycle profile must read a 0.7 km/h pace as noise');

      await repo.setActivity(h.tripId, Activity.walking);

      final asWalking = (await repo.tripById(h.tripId))!;
      expect(asWalking.activity, Activity.walking);
      expect(asWalking.movingMillis, greaterThan(0),
          reason: 'recomputing under the walking profile must recognise the same '
              'fixes as real movement');
      // Sanity check that this really did come from ActivityProfile.walking and not a
      // coincidence -- computing with the profile explicitly must agree.
      expect(
        asWalking.movingMillis,
        greaterThan(asMotorcycle.movingMillis),
      );
      // The bicycle/motorcycle-equivalent profile does not exist as a category here;
      // just confirm the profile object itself expresses the difference this test
      // exercises indirectly through the repository.
      expect(
        ActivityProfile.walking.noiseFloorKmh,
        lessThan(ActivityProfile.motorcycle.noiseFloorKmh),
      );
    });
  });

  group('process death', () {
    test('a fresh repository over the same database sees the active trip',
        () async {
      final h = await repo.startTrip(1000);
      await addPoint(h, 1000);

      // Simulates the process being killed and rebuilt: new repository, same file.
      final revived = TripRepository(db);

      final active = await revived.activeTrip();
      expect(active, isNotNull,
          reason: 'recording state must survive process death');
      expect(active!.id, h.tripId);
    });

    test('restart after pause resumes into a new segment', () async {
      final h = await repo.startTrip(1000);
      await repo.pauseTrip(2000);

      final revived = TripRepository(db);
      final resumed = (await revived.resumeTrip(3000))!;

      expect(resumed.tripId, h.tripId);
      expect(resumed.segmentId, isNot(h.segmentId));
      expect((await revived.activeTrip())!.state, TripState.recording);
    });
  });

  // ---------------------------------------------------------------------------
  // Merge — ported from MergeTest
  // ---------------------------------------------------------------------------

  group('merge', () {
    Future<int> completedTrip({
      required int startedAt,
      required int endedAt,
      int points = 3,
      String? name,
      double lat = 51.0,
    }) async {
      final h = await repo.startTrip(startedAt);
      for (var i = 0; i < points; i++) {
        await addPoint(h, startedAt + i * 1000, lat: lat + i * 0.0001);
      }
      if (name != null) await repo.renameTrip(h.tripId, name);
      await repo.completeTrip(endedAt);
      return h.tripId;
    }

    test('merge reparents everything and deletes the absorbed row', () async {
      final a = await completedTrip(startedAt: 1000, endedAt: 5000);
      final b = await completedTrip(startedAt: 10000, endedAt: 15000);

      final survivor = await repo.mergeTrips(a, b);

      expect(survivor, a);
      expect(await repo.tripById(b), isNull);
      expect(await db.countPointsForTrip(a), 6);
      expect(await db.countSegmentsForTrip(a), 2);
      expect(await db.countTrips(), 1);
    });

    test('selection order does not decide the survivor', () async {
      final earlier = await completedTrip(startedAt: 1000, endedAt: 5000);
      final later = await completedTrip(startedAt: 10000, endedAt: 15000);

      // Passed later-first on purpose.
      expect(await repo.mergeTrips(later, earlier), earlier);
    });

    test('merged aggregates are recomputed, not summed', () async {
      // The two rides are a degree of latitude apart — ~111 km. If aggregates were
      // summed, or if the segments were joined, that gap would appear as distance.
      final a = await completedTrip(startedAt: 1000, endedAt: 5000, lat: 51.0);
      final b =
          await completedTrip(startedAt: 10000, endedAt: 15000, lat: 52.0);

      await repo.mergeTrips(a, b);

      final merged = (await repo.tripById(a))!;
      expect(merged.pointCount, 6);
      expect(merged.distanceM, lessThan(200.0),
          reason:
              'the ~111 km gap leaked into distance: ${merged.distanceM} m');
    });

    test('the join remains a segment boundary', () async {
      final a = await completedTrip(startedAt: 1000, endedAt: 5000);
      final b = await completedTrip(startedAt: 10000, endedAt: 15000);

      await repo.mergeTrips(a, b);

      final segments = await repo.segmentsForTrip(a);
      expect(segments.length, 2,
          reason: 'segments must never be joined by a merge');
    });

    test('endedAt becomes the later of the two', () async {
      final a = await completedTrip(startedAt: 1000, endedAt: 5000);
      final b = await completedTrip(startedAt: 10000, endedAt: 15000);

      await repo.mergeTrips(a, b);

      expect((await repo.tripById(a))!.endedAt, 15000);
    });

    test('an unnamed survivor inherits the other name', () async {
      final a = await completedTrip(startedAt: 1000, endedAt: 5000);
      final b =
          await completedTrip(startedAt: 10000, endedAt: 15000, name: 'Part two');

      await repo.mergeTrips(a, b);

      expect((await repo.tripById(a))!.name, 'Part two');
    });

    test('an existing survivor name is kept', () async {
      final a = await completedTrip(
          startedAt: 1000, endedAt: 5000, name: 'The good one');
      final b =
          await completedTrip(startedAt: 10000, endedAt: 15000, name: 'Part two');

      await repo.mergeTrips(a, b);

      expect((await repo.tripById(a))!.name, 'The good one');
    });

    test('merging a trip with itself is rejected', () async {
      final a = await completedTrip(startedAt: 1000, endedAt: 5000);
      expect(await repo.mergeTrips(a, a), isNull);
      expect(await db.countPointsForTrip(a), 3);
    });

    test('merging an active trip is rejected', () async {
      final done = await completedTrip(startedAt: 1000, endedAt: 5000);
      final active = await repo.startTrip(10000);

      expect(await repo.mergeTrips(done, active.tripId), isNull);
      expect(await db.countTrips(), 2, reason: 'nothing may be deleted');
    });

    test('merging a missing trip is rejected', () async {
      final a = await completedTrip(startedAt: 1000, endedAt: 5000);
      expect(await repo.mergeTrips(a, 9999), isNull);
      expect(await repo.tripById(a), isNotNull);
    });

    test('merge is atomic and leaves no orphans', () async {
      final a = await completedTrip(startedAt: 1000, endedAt: 5000);
      final b = await completedTrip(startedAt: 10000, endedAt: 15000);

      await repo.mergeTrips(a, b);

      // Every surviving point and segment must belong to the survivor.
      final allPoints = await db.allPoints();
      expect(allPoints.every((p) => p.tripId == a), isTrue);
      expect(allPoints.length, 6);

      final segments = await repo.segmentsForTrip(a);
      expect(segments.every((s) => s.tripId == a), isTrue);
    });
  });
}