mnemo_cards/mnemo_cards_backend/lib/database/tables/discounts.dart

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

/// Таблица DiscountCampaigns - кампании скидок
class DiscountCampaigns 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().nullable()();
  
  Column<PgDateTime> get start => customType(PgTypes.timestampWithTimezone)();
  Column<PgDateTime> get finish => customType(PgTypes.timestampWithTimezone)();
  
  // 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
  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 Discounts - скидки
class Discounts 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 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
  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};
}

/// 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)();
  
  Column<PgDateTime> get grantedAt => customType(PgTypes.timestampWithTimezone)
      .withDefault(now())();
  
  @override
  Set<Column> get primaryKey => {discountId, userId};
}

// Конвертеры импортированы из converters.dart