import 'package:drift/drift.dart';
import '../converters.dart' show generateUuid, StringListConverter, JsonListConverter;
import '../postgres_constants.dart';
import 'users.dart';

/// Таблица DiscountCampaigns - кампании скидок
class DiscountCampaigns extends Table {
  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
  
  TextColumn get name => text().nullable()();
  
  DateTimeColumn get start => dateTime()();
  DateTimeColumn get finish => dateTime()();
  
  // Статус (enum as string)
  TextColumn get status => text()();  // created, active, expired, disabled
  
  // Теги (JSON array)
  TextColumn get tags => text()
      .withDefault(const Constant('[]'))
      .map(const StringListConverter())();
  
  // Audit
  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
  BoolColumn get isDeleted => boolean()
      .withDefault(const Constant(false))
      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
  
  @override
  Set<Column> get primaryKey => {id};
}

/// Таблица Discounts - скидки
class Discounts extends Table {
  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
  TextColumn get campaignId => text().references(DiscountCampaigns, #id, onDelete: KeyAction.cascade)();
  
  // Процент скидки (0-100)
  RealColumn get discountPercent => real()();
  
  // Продукты (JSON array)
  TextColumn get products => text()
      .withDefault(const Constant('[]'))
      .map(const JsonListConverter())();
  
  // Audit
  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
  BoolColumn get isDeleted => boolean()
      .withDefault(const Constant(false))
      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
  
  @override
  Set<Column> get primaryKey => {id};
}

/// Junction table для связи Discounts ↔ UserDatas (many-to-many)
class DiscountUserDatas extends Table {
  TextColumn get discountId => text().references(Discounts, #id, onDelete: KeyAction.cascade)();
  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
  
  DateTimeColumn get grantedAt => dateTime().withDefault(currentTimestamp)();
  
  @override
  Set<Column> get primaryKey => {discountId, userId};
}

// Конвертеры импортированы из converters.dart