import 'package:async/async.dart';
import 'package:commons_core/commons_core.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:tane/data/species_repository.dart';
import 'package:tane/data/variety_repository.dart';
import 'package:tane/db/database.dart';

import '../support/test_support.dart';

const _tomatoSeed = SpeciesSeed(
  scientificName: 'Solanum lycopersicum',
  family: 'Solanaceae',
  commonNames: {
    'en': ['Tomato'],
  },
);

void main() {
  late AppDatabase db;
  late VarietyRepository repo;

  setUp(() {
    db = newTestDatabase();
    repo = newTestRepository(db);
  });
  tearDown(() => db.close());

  test('watchVariety emits null for a missing variety', () async {
    expect(await repo.watchVariety('does-not-exist').first, isNull);
  });

  test('watchVariety reacts to a lot being added', () async {
    final id = await repo.addQuickVariety(label: 'Maize', category: 'Poaceae');
    final queue = StreamQueue(repo.watchVariety(id));

    final initial = await queue.next;
    expect(initial!.label, 'Maize');
    expect(initial.lots, isEmpty);

    await repo.addLot(
      varietyId: id,
      harvestYear: 2024,
      quantity: const Quantity(kind: QuantityKind.cob),
    );

    final updated = await queue.next;
    expect(updated!.lots.single.harvestYear, 2024);
    expect(updated.lots.single.quantity?.kind, QuantityKind.cob);

    await queue.cancel();
  });

  test('updateVariety changes scalar fields (last-writer-wins)', () async {
    final id = await repo.addQuickVariety(label: 'Old name');
    await repo.updateVariety(id: id, label: 'New name', notes: 'a note');

    final detail = await repo.watchVariety(id).first;
    expect(detail!.label, 'New name');
    expect(detail.notes, 'a note');
  });

  test(
    'softDeleteVariety hides it from watchVariety and the inventory',
    () async {
      final id = await repo.addQuickVariety(label: 'Doomed');
      await repo.softDeleteVariety(id);

      expect(await repo.watchVariety(id).first, isNull);
      expect(await repo.watchInventory().first, isEmpty);
    },
  );

  test(
    'linkSpecies exposes the scientific name and prefills empty category',
    () async {
      final species = newTestSpeciesRepository(db);
      await species.seedBundled(const [_tomatoSeed]);
      final match = (await species.search('tomato')).single;

      final id = await repo.addQuickVariety(label: "Grandma's tomato");
      await repo.linkSpecies(id, match.id);

      final detail = await repo.watchVariety(id).first;
      expect(detail!.scientificName, 'Solanum lycopersicum');
      expect(detail.category, 'Solanaceae'); // prefilled from family
    },
  );

  test('linkSpecies does not overwrite an existing category', () async {
    final species = newTestSpeciesRepository(db);
    await species.seedBundled(const [_tomatoSeed]);
    final match = (await species.search('tomato')).single;

    final id = await repo.addQuickVariety(label: 'T', category: 'My tomatoes');
    await repo.linkSpecies(id, match.id);

    final detail = await repo.watchVariety(id).first;
    expect(detail!.category, 'My tomatoes');
  });

  test(
    'addGerminationTest surfaces the latest derived rate on the lot',
    () async {
      final id = await repo.addQuickVariety(label: 'Maize');
      final lotId = await repo.addLot(varietyId: id, harvestYear: 2024);
      await repo.addGerminationTest(
        lotId: lotId,
        testedOn: 1000,
        sampleSize: 20,
        germinatedCount: 18,
      );

      final lot = (await repo.watchVariety(id).first)!.lots.single;
      expect(lot.germinationTests, hasLength(1));
      expect(lot.latestGerminationRate, closeTo(0.9, 1e-9));
    },
  );

  test('watchVariety reacts to a germination test being added', () async {
    final id = await repo.addQuickVariety(label: 'Maize');
    final lotId = await repo.addLot(varietyId: id);
    final queue = StreamQueue(repo.watchVariety(id));

    final initial = await queue.next;
    expect(initial!.lots.single.germinationTests, isEmpty);

    await repo.addGerminationTest(
      lotId: lotId,
      sampleSize: 10,
      germinatedCount: 9,
    );

    final updated = await queue.next;
    expect(updated!.lots.single.latestGerminationRate, closeTo(0.9, 1e-9));

    await queue.cancel();
  });
}