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/*
 * Copyright 2014 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;

import com.blazebit.persistence.LeafOngoingSetOperationSubqueryBuilder;
import com.blazebit.persistence.StartOngoingSetOperationSubqueryBuilder;
import com.blazebit.persistence.SubqueryBuilder;
import com.blazebit.persistence.SubqueryInitiator;
import com.blazebit.persistence.impl.expression.ExpressionFactory;

/**
 *
 * @author Moritz Becker
 * @author Christian Beikov
 * @since 1.0
 */
public class SubqueryInitiatorImpl implements SubqueryInitiator {

    private final MainQuery mainQuery;
    private final AliasManager aliasManager;
    private final JoinManager parentJoinManager;
    private final ExpressionFactory expressionFactory;
    
    private final X result;
    private final SubqueryBuilderListener listener;

    public SubqueryInitiatorImpl(MainQuery mainQuery, AliasManager aliasManager, JoinManager parentJoinManager, X result, SubqueryBuilderListener listener) {
        this.mainQuery = mainQuery;
        this.aliasManager = aliasManager;
        this.parentJoinManager = parentJoinManager;
        this.expressionFactory = mainQuery.cbf.getSubqueryExpressionFactory();
        this.result = result;
        this.listener = listener;
    }

    @Override
    public SubqueryBuilder from(Class clazz) {
        return from(clazz, null);
    }

    @Override
    public SubqueryBuilder from(Class clazz, String alias) {
        SubqueryBuilderImpl subqueryBuilder = new SubqueryBuilderImpl(mainQuery, aliasManager, parentJoinManager, mainQuery.cbf.getSubqueryExpressionFactory(), result, listener);
        subqueryBuilder.from(clazz, alias);
        listener.onBuilderStarted(subqueryBuilder);
        return subqueryBuilder;
    }

    @Override
    public StartOngoingSetOperationSubqueryBuilder> startSet() {
        FinalSetOperationSubqueryBuilderImpl parentFinalSetOperationBuilder = new FinalSetOperationSubqueryBuilderImpl(mainQuery, result, null, false, listener, null);
        OngoingFinalSetOperationSubqueryBuilderImpl subFinalSetOperationBuilder = new OngoingFinalSetOperationSubqueryBuilderImpl(mainQuery, null, null, true, parentFinalSetOperationBuilder.getSubListener(), null);
        listener.onBuilderStarted(parentFinalSetOperationBuilder);
        
        LeafOngoingSetOperationSubqueryBuilderImpl leafCb = new LeafOngoingSetOperationSubqueryBuilderImpl(mainQuery, aliasManager, parentJoinManager, expressionFactory, result, parentFinalSetOperationBuilder.getSubListener(), parentFinalSetOperationBuilder);
        OngoingSetOperationSubqueryBuilderImpl> cb = new OngoingSetOperationSubqueryBuilderImpl>(mainQuery, aliasManager, parentJoinManager, expressionFactory, result, subFinalSetOperationBuilder.getSubListener(), subFinalSetOperationBuilder, leafCb);
        
        subFinalSetOperationBuilder.setOperationManager.setStartQueryBuilder(cb);
        parentFinalSetOperationBuilder.setOperationManager.setStartQueryBuilder(subFinalSetOperationBuilder);
        
        subFinalSetOperationBuilder.getSubListener().onBuilderStarted(cb);
        parentFinalSetOperationBuilder.getSubListener().onBuilderStarted(leafCb);
        return cb;
    }

}