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().customConstraint('NOT NULL DEFAULT FALSE')();
  // PostgreSQL использует нативный BOOLEAN
  Column<PgDateTime> get deletedAt =>
      customType(PgTypes.timestampWithTimezone).nullable()();

  @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().customConstraint('NOT NULL DEFAULT FALSE')();
  // PostgreSQL использует нативный BOOLEAN
  Column<PgDateTime> get deletedAt =>
      customType(PgTypes.timestampWithTimezone).nullable()();

  @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