import 'package:flutter_test/flutter_test.dart';
import 'package:groci/models/line_item.dart';
import 'package:groci/models/product.dart';
import 'package:groci/utils/product_names.dart';

import 'test_helpers.dart';

Product _product(int id, String name, {String? supermarket}) => Product(
  id: id,
  name: name,
  lastPrice: 1,
  timesSeen: 1,
  updatedAt: DateTime(2026, 1, 1),
  supermarket: supermarket,
);

void main() {
  ensureTestSqlite();

  group('nameConflictGroups', () {
    test('groups products that differ only by case at the same store', () {
      final groups = nameConflictGroups([
        _product(1, 'Broccoli', supermarket: 'Jumbo'),
        _product(2, 'BROCCOLI', supermarket: 'Jumbo'),
        _product(3, 'Milk', supermarket: 'Jumbo'),
      ]);

      expect(groups, hasLength(1));
      expect(groups.single.map((product) => product.id), [1, 2]);
    });

    test('ignores same name at different stores', () {
      final groups = nameConflictGroups([
        _product(1, 'Broccoli', supermarket: 'Jumbo'),
        _product(2, 'BROCCOLI', supermarket: 'Lidl'),
      ]);

      expect(groups, isEmpty);
    });
  });

  group('buildNameConflictGroups', () {
    test('finds conflicts from trip lines linked to different products', () {
      final groups = buildNameConflictGroups(
        products: [
          _product(1, 'Broccoli', supermarket: 'Jumbo'),
          _product(2, 'BROCCOLI', supermarket: 'Jumbo'),
        ],
        shopLines: const [
          (productId: 1, name: 'Broccoli', supermarket: 'Jumbo'),
          (productId: 2, name: 'BROCCOLI', supermarket: 'Jumbo'),
        ],
      );

      expect(groups, hasLength(1));
      expect(groups.single.products.map((product) => product.id), [1, 2]);
      expect(groups.single.supermarket, 'Jumbo');
    });
  });

  group('findSpellingVariants', () {
    test('finds multiple receipt spellings for one product at one store', () {
      final variants = findSpellingVariants(
        products: [_product(1, 'Broccoli', supermarket: 'Jumbo')],
        shopLines: const [
          (productId: 1, name: 'Broccoli', supermarket: 'Jumbo'),
          (productId: 1, name: 'BROCCOLI', supermarket: 'Jumbo'),
        ],
      );

      expect(variants, hasLength(1));
      expect(variants.single.product.id, 1);
      expect(variants.single.supermarket, 'Jumbo');
      expect(variants.single.variants, ['Broccoli', 'BROCCOLI']);
    });

    test('ignores different spellings at different stores', () {
      final variants = findSpellingVariants(
        products: [_product(1, 'Broccoli', supermarket: 'Jumbo')],
        shopLines: const [
          (productId: 1, name: 'Broccoli', supermarket: 'Jumbo'),
          (productId: 1, name: 'BROCCOLI', supermarket: 'Lidl'),
        ],
      );

      expect(variants, isEmpty);
    });
  });

  test('same name at different supermarkets creates separate products', () async {
    final repository = memoryRepository();
    await repository.saveShop(
      supermarket: 'Jumbo',
      shoppedAt: DateTime(2026, 8, 1),
      items: [LineItem(id: '1', name: 'Milk', price: 1.5)],
    );
    await repository.saveShop(
      supermarket: 'Lidl',
      shoppedAt: DateTime(2026, 8, 2),
      items: [LineItem(id: '2', name: 'Milk', price: 1.2)],
    );

    final products = await repository.getAll();
    expect(products, hasLength(2));
    expect(products.map((p) => p.supermarket).toSet(), {'Jumbo', 'Lidl'});
    expect(await repository.getProductNameIssues(), isEmpty);
  });

  test('getNameConflictGroups finds duplicates in the database', () async {
    final repository = memoryRepository();
    await seedCaseConflictCatalog(repository);

    final groups = await repository.getNameConflictGroups();
    expect(groups, hasLength(1));
    expect(groups.single.map((product) => product.name).toSet(), {
      'Broccoli',
      'BROCCOLI',
    });
  });

  test('getProductNameIssues finds receipt spelling variants', () async {
    final repository = memoryRepository();
    await repository.saveShop(
      supermarket: 'Jumbo',
      shoppedAt: DateTime(2026, 8, 1),
      items: [LineItem(id: '1', name: 'Broccoli', price: 1.5)],
    );
    await repository.saveShop(
      supermarket: 'Jumbo',
      shoppedAt: DateTime(2026, 8, 2),
      items: [LineItem(id: '2', name: 'BROCCOLI', price: 1.8)],
    );

    final issues = await repository.getProductNameIssues();
    expect(issues.mergeGroups, isEmpty);
    expect(issues.spellingVariants, hasLength(1));
    expect(issues.spellingVariants.single.supermarket, 'Jumbo');
    expect(issues.spellingVariants.single.variants, ['Broccoli', 'BROCCOLI']);
  });

  test('dismissNameIssue hides a spelling variant', () async {
    final repository = memoryRepository();
    await repository.saveShop(
      supermarket: 'Jumbo',
      shoppedAt: DateTime(2026, 8, 1),
      items: [LineItem(id: '1', name: 'Broccoli', price: 1.5)],
    );
    await repository.saveShop(
      supermarket: 'Jumbo',
      shoppedAt: DateTime(2026, 8, 2),
      items: [LineItem(id: '2', name: 'BROCCOLI', price: 1.8)],
    );

    final issue =
        (await repository.getProductNameIssues()).spellingVariants.single;
    await repository.dismissNameIssue(issue.key);

    expect(await repository.getProductNameIssues(), isEmpty);
  });

  test('mergeProducts combines purchases onto the kept product', () async {
    final repository = memoryRepository();
    await seedCaseConflictCatalog(repository);

    await repository.mergeProducts(keepId: 1, sourceIds: [2]);

    final after = await repository.getAll();
    expect(after, hasLength(1));
    expect(after.single.name, 'Broccoli');
    expect(after.single.timesSeen, 2);
    expect(await repository.getPurchases(1), hasLength(2));
  });

  test('unifyProductSpelling updates catalog and receipt lines', () async {
    final repository = memoryRepository();
    await repository.saveShop(
      supermarket: 'Jumbo',
      shoppedAt: DateTime(2026, 8, 1),
      items: [LineItem(id: '1', name: 'Broccoli', price: 1.5)],
    );
    await repository.saveShop(
      supermarket: 'Jumbo',
      shoppedAt: DateTime(2026, 8, 2),
      items: [LineItem(id: '2', name: 'BROCCOLI', price: 1.8)],
    );
    final product = (await repository.getAll()).single;

    await repository.unifyProductSpelling(
      productId: product.id,
      name: 'BROCCOLI',
      supermarket: 'Jumbo',
    );

    final updated = (await repository.getProduct(product.id))!;
    expect(updated.name, 'BROCCOLI');
    expect((await repository.getProductNameIssues()).isEmpty, isTrue);
  });
}