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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.JoinType;
import com.querydsl.core.dml.UpdateClause;
import com.querydsl.core.support.QueryMixin;
import com.querydsl.core.types.EntityPath;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.Predicate;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.jpa.HQLTemplates;
import com.querydsl.jpa.JPAQueryMixin;
import com.querydsl.jpa.JPQLSerializer;
import com.querydsl.jpa.JPQLTemplates;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.hibernate.LockMode;
import org.hibernate.Session;
import org.hibernate.StatelessSession;
import org.hibernate.query.Query;

/**
 * UpdateClause implementation for Hibernate
 *
 * @author tiwe
 */
public class HibernateUpdateClause implements UpdateClause {

  private final QueryMixin queryMixin = new JPAQueryMixin();

  private final Map, Expression> updates = new LinkedHashMap<>();

  private final SessionHolder session;

  private final JPQLTemplates templates;

  private final Map, LockMode> lockModes = new HashMap<>();

  public HibernateUpdateClause(Session session, EntityPath entity) {
    this(new DefaultSessionHolder(session), entity, HQLTemplates.DEFAULT);
  }

  public HibernateUpdateClause(StatelessSession session, EntityPath entity) {
    this(new StatelessSessionHolder(session), entity, HQLTemplates.DEFAULT);
  }

  public HibernateUpdateClause(Session session, EntityPath entity, JPQLTemplates templates) {
    this(new DefaultSessionHolder(session), entity, templates);
  }

  public HibernateUpdateClause(
      SessionHolder session, EntityPath entity, JPQLTemplates templates) {
    this.session = session;
    this.templates = templates;
    queryMixin.addJoin(JoinType.DEFAULT, entity);
  }

  @Override
  public long execute() {
    var serializer = new JPQLSerializer(templates, null);
    serializer.serializeForUpdate(queryMixin.getMetadata(), updates);

    Query query = session.createQuery(serializer.toString());
    for (Map.Entry, LockMode> entry : lockModes.entrySet()) {
      query.setLockMode(entry.getKey().toString(), entry.getValue());
    }
    HibernateUtil.setConstants(
        query, serializer.getConstants(), queryMixin.getMetadata().getParams());
    return query.executeUpdate();
  }

  @Override
  public  HibernateUpdateClause set(Path path, T value) {
    if (value != null) {
      updates.put(path, Expressions.constant(value));
    } else {
      setNull(path);
    }
    return this;
  }

  @Override
  public  HibernateUpdateClause set(Path path, Expression expression) {
    if (expression != null) {
      updates.put(path, expression);
    } else {
      setNull(path);
    }
    return this;
  }

  @Override
  public  HibernateUpdateClause setNull(Path path) {
    updates.put(path, Expressions.nullExpression(path));
    return this;
  }

  @SuppressWarnings("unchecked")
  @Override
  public HibernateUpdateClause set(List> paths, List values) {
    for (var i = 0; i < paths.size(); i++) {
      if (values.get(i) != null) {
        updates.put(paths.get(i), Expressions.constant(values.get(i)));
      } else {
        updates.put(paths.get(i), Expressions.nullExpression(paths.get(i)));
      }
    }
    return this;
  }

  @Override
  public HibernateUpdateClause where(Predicate... o) {
    for (Predicate p : o) {
      queryMixin.where(p);
    }
    return this;
  }

  /**
   * Set the lock mode for the given path.
   *
   * @return the current object
   */
  @SuppressWarnings("unchecked")
  public HibernateUpdateClause setLockMode(Path path, LockMode lockMode) {
    lockModes.put(path, lockMode);
    return this;
  }

  @Override
  public String toString() {
    var serializer = new JPQLSerializer(templates, null);
    serializer.serializeForUpdate(queryMixin.getMetadata(), updates);
    return serializer.toString();
  }

  @Override
  public boolean isEmpty() {
    return updates.isEmpty();
  }
}