package com.sonymusic.dx.dxadvsearchservice.service;

import com.sonymusic.dx.dxadvsearchservice.dto.ProductClassDTO;
import com.sonymusic.dx.persistence.gras.ProductClass;
import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import jakarta.persistence.TypedQuery;
import jakarta.persistence.criteria.CriteriaBuilder;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Root;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public class ProductClassService {

    @PersistenceContext(name = "dx-gras-persistence")
    private EntityManager em;

    public List<ProductClassDTO> getProductClassList() {
        CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaQuery<ProductClassDTO> cq=cb.createQuery(ProductClassDTO.class);
        Root<ProductClass> root =cq.from(ProductClass.class);
        cq.select(cb.construct(
                ProductClassDTO.class,
                root.get("productClassKey"),
                root.get("productClassName")
        ));
        cq.orderBy(cb.asc(root.get("productClassName")));
        cq.distinct(true);
        TypedQuery<ProductClassDTO> query = em.createQuery(cq);

        List<ProductClassDTO> resultSet = query.getResultList();

        return resultSet;
    }
}