package app.services.db;

import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service
public class DBService {

    EntityManager entityManager_rw;
    EntityManager entityManager_ro;

    @Autowired
    public DBService(
            @Qualifier(value = "RwEntityManager") EntityManager entityManager_rw,
            @Qualifier(value = "RoEntityManager") EntityManager entityManager_ro
            ) {
        this.entityManager_rw = entityManager_rw;
        this.entityManager_ro = entityManager_ro;
    }

    public Long getDBServerTime() {
        Long rw_time = getMainServerTime();
        Long ro_time = getReplicaServerTime();
        return rw_time;
    }

    public Long getMainServerTime() {
        return (Long) entityManager_rw.createNativeQuery("SELECT UNIX_TIMESTAMP()")
                .getSingleResult();
    }

    public Long getReplicaServerTime() {
        return (Long) entityManager_ro.createNativeQuery("SELECT UNIX_TIMESTAMP()")
                .getSingleResult();
    }
}