import 'package:drift/drift.dart';
import 'package:drift_postgres/drift_postgres.dart';
import '../converters.dart' show generateUuid, JsonMapConverter;
import 'packs.dart';

/// Таблица Tests - тесты
class Tests extends Table {
  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
  TextColumn get id => text()
      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
  
  TextColumn get name => text()();
  TextColumn get color => text().nullable()();
  TextColumn get cover => text().nullable()();
  TextColumn get version => text().nullable()();
  TextColumn get time => text().nullable()();
  TextColumn get timeSubtitle => text().nullable()();
  
  // Audit
  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
      .withDefault(now())();
  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
      .withDefault(now())();
  BoolColumn get isDeleted => boolean()
      .withDefault(const Constant(false))
      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
  
  @override
  Set<Column> get primaryKey => {id};
}

/// Таблица TestQuestions - вопросы тестов
class TestQuestions extends Table {
  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
  TextColumn get id => text()
      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
  TextColumn get testId => text()
      .references(Tests, #id, onDelete: KeyAction.cascade)();
  
  // Тип вопроса (enum as string)
  TextColumn get questionType => text()();
  TextColumn get body => text()();
  
  // Audit
  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
      .withDefault(now())();
  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
      .withDefault(now())();
  
  @override
  Set<Column> get primaryKey => {id};
}

/// Таблица TestPackRelations - связь Tests с CardPacks (many-to-many)
class TestPackRelations extends Table {
  TextColumn get testId => text()
      .references(Tests, #id, onDelete: KeyAction.cascade)();
  TextColumn get packId => text()
      .references(CardPacks, #id, onDelete: KeyAction.cascade)();
  
  @override
  Set<Column> get primaryKey => {testId, packId};
}

/// Таблица TestStatistics - статистика прохождения тестов
class TestStatistics extends Table {
  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
  TextColumn get id => text()
      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
  TextColumn get userId => text()();  // Reference to Users, but not FK to avoid circular deps
  TextColumn get testId => text()
      .references(Tests, #id, onDelete: KeyAction.cascade)();
  
  // Результаты (JSON)
  TextColumn get results => text()
      .withDefault(const Constant('{}'))
      .map(const JsonMapConverter())();
  
  Column<PgDateTime> get completedAt => customType(PgTypes.timestampWithTimezone)
      .withDefault(now())();
  
  // Audit
  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
      .withDefault(now())();
  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
      .withDefault(now())();
  
  @override
  Set<Column> get primaryKey => {id};
}

// Конвертеры импортированы из converters.dart