/*
 * Copyright 2014 - 2017 Blazebit.
 *
 * 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.blazebit.persistence.impl.hibernate;

import org.hibernate.MappingException;
import org.hibernate.engine.spi.LoadQueryInfluencers;
import org.hibernate.engine.spi.QueryParameters;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.loader.collection.SubselectOneToManyLoader;
import org.hibernate.persister.collection.QueryableCollection;

import java.util.Map;

/**
 *
 * @author Christian Beikov
 * @since 1.2.0
 */
public class CustomSubselectOneToManyLoader extends SubselectOneToManyLoader {
    public CustomSubselectOneToManyLoader(QueryableCollection persister, String subquery, java.util.Collection entityKeys, QueryParameters queryParameters, Map<String, int[]> namedParameterLocMap, SessionFactoryImplementor factory, LoadQueryInfluencers loadQueryInfluencers) throws MappingException {
        super(persister, subquery, entityKeys, queryParameters, namedParameterLocMap, factory, loadQueryInfluencers);
        String originalSql = queryParameters.getFilteredSQL();
        if (originalSql.startsWith("with ")) {
            StringBuilder sb = new StringBuilder(sql.length() + originalSql.length());
            int brackets = 0;
            boolean cteMode = false;
            for (int i = 0; i < originalSql.length(); i++) {
                final char c = originalSql.charAt(i);
                if (c == '(') {
                    brackets++;
                } else if (c == ')') {
                    brackets--;
                    if (brackets == 0) {
                        cteMode = !cteMode;
                    }
                }

                if (!cteMode && brackets == 0 && originalSql.regionMatches(true, i, "select ", 0, "select ".length())) {
                    break;
                }

                sb.append(c);
            }

            sb.append(sql);
            this.sql = sb.toString();
        }
    }
}