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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.querydsl.jpa.hibernate;

import com.querydsl.core.Tuple;
import com.querydsl.core.types.EntityPath;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.jpa.HQLTemplates;
import com.querydsl.jpa.JPQLQueryFactory;
import com.querydsl.jpa.JPQLTemplates;
import java.util.function.Supplier;
import org.hibernate.Session;

/**
 * Factory class for query and DML clause creation
 *
 * @author tiwe
 */
public class HibernateQueryFactory implements JPQLQueryFactory {

  private final JPQLTemplates templates;

  private final Supplier session;

  public HibernateQueryFactory(Session session) {
    this(HQLTemplates.DEFAULT, session);
  }

  public HibernateQueryFactory(JPQLTemplates templates, final Session session) {
    this.session = () -> session;
    this.templates = templates;
  }

  public HibernateQueryFactory(Supplier session) {
    this(HQLTemplates.DEFAULT, session);
  }

  public HibernateQueryFactory(JPQLTemplates templates, Supplier session) {
    this.session = session;
    this.templates = templates;
  }

  @Override
  public HibernateDeleteClause delete(EntityPath path) {
    return new HibernateDeleteClause(session.get(), path, templates);
  }

  @Override
  public  HibernateQuery select(Expression expr) {
    return query().select(expr);
  }

  @Override
  public HibernateQuery select(Expression... exprs) {
    return query().select(exprs);
  }

  @Override
  public  HibernateQuery selectDistinct(Expression expr) {
    return select(expr).distinct();
  }

  @Override
  public HibernateQuery selectDistinct(Expression... exprs) {
    return select(exprs).distinct();
  }

  @Override
  public HibernateQuery selectOne() {
    return select(Expressions.ONE);
  }

  @Override
  public HibernateQuery selectZero() {
    return select(Expressions.ZERO);
  }

  @Override
  public  HibernateQuery selectFrom(EntityPath from) {
    return select(from).from(from);
  }

  @Override
  public HibernateQuery from(EntityPath from) {
    return query().from(from);
  }

  @Override
  public HibernateQuery from(EntityPath... from) {
    return query().from(from);
  }

  @Override
  public HibernateUpdateClause update(EntityPath path) {
    return new HibernateUpdateClause(session.get(), path, templates);
  }

  @Override
  public HibernateInsertClause insert(EntityPath path) {
    return new HibernateInsertClause(session.get(), path, templates);
  }

  @Override
  public HibernateQuery query() {
    return new HibernateQuery(session.get(), templates);
  }
}