import 'package:halkyon_interop/halkyon_interop.dart';
import 'package:test/test.dart';

void main() {
  group('TaskShape', () {
    final fixedTime = DateTime.utc(2026, 1, 15, 12);
    final deepLink = Uri.parse('halkyon-learn://review/spanish-vocab');

    TaskShape build({
      String sourceAppId = 'eu.halkyon.learn',
      String externalId = 'review-12',
      String title = 'Review 12 cards',
      String? subtitle = 'Spanish vocabulary',
      DateTime? dueAt,
      Uri? linkOverride,
    }) => TaskShape(
      sourceAppId: sourceAppId,
      externalId: externalId,
      title: title,
      subtitle: subtitle,
      dueAt: dueAt ?? fixedTime,
      deepLink: linkOverride ?? deepLink,
    );

    test('exposes provided fields', () {
      final task = build();
      expect(task.sourceAppId, 'eu.halkyon.learn');
      expect(task.externalId, 'review-12');
      expect(task.title, 'Review 12 cards');
      expect(task.subtitle, 'Spanish vocabulary');
      expect(task.dueAt, fixedTime);
      expect(task.deepLink, deepLink);
    });

    test('allows null for optional fields', () {
      final task = TaskShape(
        sourceAppId: 'eu.halkyon.learn',
        externalId: 'review-12',
        title: 'Review',
        deepLink: deepLink,
      );
      expect(task.subtitle, isNull);
      expect(task.dueAt, isNull);
    });

    test('two instances with identical fields are equal', () {
      expect(build(), equals(build()));
      expect(build().hashCode, equals(build().hashCode));
    });

    test('differs on any field change', () {
      expect(build(), isNot(equals(build(title: 'Different'))));
      expect(build(), isNot(equals(build(externalId: 'different-id'))));
      expect(build(), isNot(equals(build(sourceAppId: 'eu.halkyon.todo'))));
      expect(build(), isNot(equals(build(dueAt: DateTime.utc(2026, 2)))));
      expect(
        build(),
        isNot(equals(build(linkOverride: Uri.parse('halkyon-todo://x')))),
      );
    });

    test('toString includes identifying fields', () {
      final str = build().toString();
      expect(str, contains('eu.halkyon.learn'));
      expect(str, contains('review-12'));
      expect(str, contains('Review 12 cards'));
    });
  });

  group('HalkyonEvent / ReviewDueEvent', () {
    final fixedTime = DateTime.utc(2026, 1, 15, 12);

    test('ReviewDueEvent is a HalkyonEvent', () {
      final event = ReviewDueEvent(
        occurredAt: fixedTime,
        studysetId: 'spanish-vocab',
        dueCount: 12,
      );
      expect(event, isA<HalkyonEvent>());
    });

    test('exposes provided fields', () {
      final event = ReviewDueEvent(
        occurredAt: fixedTime,
        studysetId: 'spanish-vocab',
        dueCount: 12,
      );
      expect(event.occurredAt, fixedTime);
      expect(event.studysetId, 'spanish-vocab');
      expect(event.dueCount, 12);
    });

    test('events with identical fields are equal', () {
      final a = ReviewDueEvent(
        occurredAt: fixedTime,
        studysetId: 'spanish-vocab',
        dueCount: 12,
      );
      final b = ReviewDueEvent(
        occurredAt: fixedTime,
        studysetId: 'spanish-vocab',
        dueCount: 12,
      );
      expect(a, equals(b));
      expect(a.hashCode, equals(b.hashCode));
    });

    test('differs on field changes', () {
      final base = ReviewDueEvent(
        occurredAt: fixedTime,
        studysetId: 'spanish-vocab',
        dueCount: 12,
      );
      expect(
        base,
        isNot(
          equals(
            ReviewDueEvent(
              occurredAt: fixedTime,
              studysetId: 'spanish-vocab',
              dueCount: 13,
            ),
          ),
        ),
      );
      expect(
        base,
        isNot(
          equals(
            ReviewDueEvent(
              occurredAt: fixedTime,
              studysetId: 'french-vocab',
              dueCount: 12,
            ),
          ),
        ),
      );
    });

    test('switch on sealed type is exhaustive', () {
      final HalkyonEvent event = ReviewDueEvent(
        occurredAt: fixedTime,
        studysetId: 'spanish-vocab',
        dueCount: 12,
      );

      // If a new HalkyonEvent subtype is added without updating this switch,
      // the analyzer/compiler will flag it. That's the value of `sealed`.
      final description = switch (event) {
        ReviewDueEvent(:final studysetId, :final dueCount) =>
          '$dueCount cards due in $studysetId',
      };

      expect(description, '12 cards due in spanish-vocab');
    });
  });

  group('DormantPublisher', () {
    test('accepts publish calls without throwing', () async {
      const publisher = DormantPublisher();
      final event = ReviewDueEvent(
        occurredAt: DateTime.utc(2026, 1, 15),
        studysetId: 'spanish-vocab',
        dueCount: 5,
      );
      await expectLater(publisher.publish(event), completes);
    });

    test('implements EventPublisher', () {
      const publisher = DormantPublisher();
      expect(publisher, isA<EventPublisher>());
    });
  });
}