ProductRepository.java

package com.ecommerce.product.repository;

import com.ecommerce.product.entity.Product;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

import java.math.BigDecimal;
import java.util.List;

@Repository
public interface ProductRepository extends JpaRepository<Product, Long> {
    
    Page<Product> findByCategory(String category, Pageable pageable);
    
    Page<Product> findByBrand(String brand, Pageable pageable);
    
    Page<Product> findByStatus(Product.ProductStatus status, Pageable pageable);
    
    Page<Product> findByFeatured(Boolean featured, Pageable pageable);
    
    @Query("SELECT p FROM Product p WHERE p.price BETWEEN :minPrice AND :maxPrice")
    Page<Product> findByPriceRange(@Param("minPrice") BigDecimal minPrice, 
                                  @Param("maxPrice") BigDecimal maxPrice, 
                                  Pageable pageable);
    
    @Query("SELECT p FROM Product p WHERE p.category = :category AND p.price BETWEEN :minPrice AND :maxPrice")
    Page<Product> findByCategoryAndPriceRange(@Param("category") String category,
                                             @Param("minPrice") BigDecimal minPrice,
                                             @Param("maxPrice") BigDecimal maxPrice,
                                             Pageable pageable);
    
    @Query("SELECT p FROM Product p WHERE p.name LIKE %:keyword% OR p.description LIKE %:keyword% OR p.brand LIKE %:keyword%")
    Page<Product> searchProducts(@Param("keyword") String keyword, Pageable pageable);
    
    @Query("SELECT DISTINCT p.category FROM Product p WHERE p.status = 'ACTIVE'")
    List<String> findAllActiveCategories();
    
    @Query("SELECT DISTINCT p.brand FROM Product p WHERE p.status = 'ACTIVE'")
    List<String> findAllActiveBrands();
    
    @Query("SELECT p FROM Product p WHERE p.stockQuantity < :threshold")
    List<Product> findLowStockProducts(@Param("threshold") Integer threshold);
}