import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:kooltap/database/app_database.dart';

/// The parts of the v12 schema that the v13 migration touches.
const _v12Schema = [
  'CREATE TABLE bar_tabs (id TEXT NOT NULL, customer_name TEXT NOT NULL, '
      "status TEXT NOT NULL DEFAULT 'open', opened_at INTEGER NOT NULL, "
      'closed_at INTEGER NULL, version INTEGER NOT NULL DEFAULT 0, '
      'PRIMARY KEY (id))',
  'CREATE TABLE tab_items (id TEXT NOT NULL, tab_id TEXT NOT NULL, '
      'product_id TEXT NOT NULL, product_name TEXT NOT NULL, '
      'quantity INTEGER NOT NULL, unit_price_in_cents INTEGER NOT NULL, '
      'created_at INTEGER NOT NULL, PRIMARY KEY (id))',
  'CREATE TABLE tab_item_purchases (id TEXT NOT NULL, '
      'tab_item_id TEXT NOT NULL, purchased_at INTEGER NOT NULL, '
      'removed_at INTEGER NULL, PRIMARY KEY (id))',
  "INSERT INTO bar_tabs VALUES ('tab-1', 'Alice', 'open', 1700000000, NULL, 4)",
  "INSERT INTO tab_items VALUES ('item-1', 'tab-1', 'prod-1', 'Beer', 3, 400, "
      '1700000100)',
  "INSERT INTO tab_item_purchases VALUES ('p-1', 'item-1', 1700000200, NULL)",
  "INSERT INTO tab_item_purchases VALUES ('p-2', 'item-1', 1700000300, "
      '1700000400)',
  "INSERT INTO tab_item_purchases VALUES ('orphan', 'gone', 1700000500, NULL)",
  'PRAGMA user_version = 12',
];

void main() {
  late AppDatabase database;

  setUp(() {
    database = AppDatabase(
      NativeDatabase.memory(
        setup: (rawDatabase) {
          for (final statement in _v12Schema) {
            rawDatabase.execute(statement);
          }
        },
      ),
    );
  });

  tearDown(() async {
    await database.close();
  });

  test('drops the unused status columns and keeps the tab', () async {
    final tabs = await database.select(database.barTabs).get();

    expect(tabs.single.customerName, 'Alice');
    expect(tabs.single.version, 4);

    final columns = await database
        .customSelect('PRAGMA table_info(bar_tabs)')
        .map((row) => row.read<String>('name'))
        .get();
    expect(columns, isNot(contains('status')));
    expect(columns, isNot(contains('closed_at')));
  });

  test('backfills missing purchases up to the item quantity', () async {
    final purchases = await (database.select(
      database.tabItemPurchases,
    )..where((row) => row.tabItemId.equals('item-1'))).get();

    final active = purchases.where((row) => row.removedAt == null);
    expect(active, hasLength(3));
    expect(purchases.where((row) => row.removedAt != null), hasLength(1));
  });

  test('deletes purchases whose item no longer exists', () async {
    final orphan = await (database.select(
      database.tabItemPurchases,
    )..where((row) => row.id.equals('orphan'))).getSingleOrNull();

    expect(orphan, isNull);
  });
}