GameTime/test/application/use_cases_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:gametime/application/application.dart';
import 'package:gametime/domain/domain.dart';

void main() {
  test('Exercise requires at least one active measure', () {
    expect(
      () => Exercise(
        metadata: _metadata('exercise-1'),
        name: 'Push up',
        hasTimeMeasure: false,
        hasRepsMeasure: false,
        hasScoreMeasure: false,
      ),
      throwsA(isA<DomainException>()),
    );
  });

  test('Workout template use case rejects active measure overrides', () async {
    final useCase = WorkoutTemplateUseCases(
      templateRepository: _FakeWorkoutTemplateRepository(),
      programRepository: _FakeProgramRepository(),
      clock: _FakeClock(DateTime.utc(2026, 7, 17, 12)),
      ids: _FakeIds(),
      originDeviceId: 'device-1',
    );

    await expectLater(
      useCase.overrideExerciseTargets(
        workoutTemplateProgramId: 'template-program-1',
        snapshotProgramExerciseId: 'exercise-snapshot-1',
        attemptedMeasureOverride: {WorkoutMeasure.reps},
      ),
      throwsA(isA<DomainException>()),
    );
  });

  test('Active session elapsed time is based on persisted timestamps', () {
    final clock = _FakeClock(DateTime.utc(2026, 7, 17, 12));
    final session = ActiveWorkoutSession(
      metadata: _metadata('session-1'),
      status: ActiveWorkoutStatus.running,
      startedAt: clock.now(),
      lastPersistedAt: clock.now(),
      elapsedActiveMs: 0,
      currentProgramIndex: 0,
      currentExerciseIndex: 0,
      currentSetIndex: 0,
      resolvedTemplateSnapshotJson: '{}',
    );

    clock.value = clock.value.add(const Duration(seconds: 30));
    final paused = session.pause(clock.now());
    expect(paused.elapsedActiveMs, 30000);

    clock.value = clock.value.add(const Duration(minutes: 5));
    final resumed = paused.resume(clock.now());
    expect(resumed.elapsedActiveMillisecondsAt(clock.now()), 30000);

    clock.value = clock.value.add(const Duration(seconds: 15));
    expect(resumed.elapsedActiveMillisecondsAt(clock.now()), 45000);
  });
}

EntityMetadata _metadata(String id) {
  return EntityMetadata(
    id: id,
    createdAt: DateTime.utc(2026, 7, 17),
    updatedAt: DateTime.utc(2026, 7, 17),
    originDeviceId: 'device-1',
  );
}

final class _FakeClock implements Clock {
  _FakeClock(this.value);

  DateTime value;

  @override
  DateTime now() => value;
}

final class _FakeIds implements IdGenerator {
  var _next = 0;

  @override
  String newId() {
    _next += 1;
    return 'id-$_next';
  }
}

final class _FakeWorkoutTemplateRepository
    implements WorkoutTemplateRepository {
  @override
  Future<WorkoutTemplate?> findById(String id) async => null;

  @override
  Future<void> save(WorkoutTemplate template) async {}

  @override
  Future<void> saveOverride(WorkoutTemplateExerciseOverride override) async {}

  @override
  Future<void> saveProgram(WorkoutTemplateProgram program) async {}
}

final class _FakeProgramRepository implements ProgramRepository {
  @override
  Future<Program?> findById(String id) async => null;

  @override
  Future<void> save(Program program) async {}

  @override
  Future<void> saveExercise(ProgramExercise exercise) async {}
}