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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 java.util.ArrayList;
import java.util.List;

import javax.persistence.Tuple;

import com.blazebit.persistence.BaseOngoingSetOperationBuilder;
import com.blazebit.persistence.impl.expression.Expression;
import com.blazebit.persistence.impl.expression.ExpressionFactory;
import com.blazebit.persistence.spi.DbmsStatementType;
import com.blazebit.persistence.spi.SetOperationType;

/**
 *
 * @author Christian Beikov
 * @author Moritz Becker
 * @since 1.0
 */
public class BaseSubqueryBuilderImpl, Z extends BaseOngoingSetOperationBuilder> extends AbstractCommonQueryBuilder> implements SubqueryInternalBuilder {

    protected final T result;
    protected final SubqueryBuilderListener listener;
    protected final SubqueryBuilderListenerImpl subListener;

    public BaseSubqueryBuilderImpl(MainQuery mainQuery, AliasManager aliasManager, JoinManager parentJoinManager, ExpressionFactory expressionFactory, T result, SubqueryBuilderListener listener, BaseFinalSetOperationSubqueryBuilderImpl finalSetOperationBuilder) {
        super(mainQuery, false, DbmsStatementType.SELECT, Tuple.class, null, aliasManager, parentJoinManager, expressionFactory, finalSetOperationBuilder);
        this.result = result;
        this.listener = listener;
        this.subListener = new SubqueryBuilderListenerImpl();
    }
    
    public SubqueryBuilderListenerImpl getSubListener() {
        return subListener;
    }

    @Override
    public List getSelectExpressions() {
        List selectExpressions = new ArrayList(selectManager.getSelectInfos().size());

        for (SelectInfo info : selectManager.getSelectInfos()) {
            selectExpressions.add(info.getExpression());
        }

        return selectExpressions;
    }

    public T getResult() {
        return result;
    }
    
    protected BaseFinalSetOperationSubqueryBuilderImpl createFinalSetOperationBuilder(SetOperationType operator, boolean nested, boolean isSubquery) {
        SubqueryBuilderImpl newInitiator = finalSetOperationBuilder == null ? null : finalSetOperationBuilder.getInitiator();
        return createFinalSetOperationBuilder(operator, nested, isSubquery, newInitiator);
    }
    
    protected BaseFinalSetOperationSubqueryBuilderImpl createFinalSetOperationBuilder(SetOperationType operator, boolean nested, boolean isSubquery, SubqueryBuilderImpl newInitiator) {
        // TODO: this should never be null, handle it!
        SubqueryBuilderListener newListener = finalSetOperationBuilder == null ? listener : finalSetOperationBuilder.getSubListener();
        T newResult = finalSetOperationBuilder == null ? result : finalSetOperationBuilder.getResult();
        
        if (isSubquery) {
            return new OngoingFinalSetOperationSubqueryBuilderImpl(mainQuery, newResult, operator, nested, newListener, newInitiator);
        } else {
            return new FinalSetOperationSubqueryBuilderImpl(mainQuery, newResult, operator, nested, newListener, newInitiator);
        }
    }

    @SuppressWarnings("unchecked")
    protected LeafOngoingSetOperationSubqueryBuilderImpl createLeaf(BaseFinalSetOperationSubqueryBuilderImpl finalSetOperationBuilder) {
        SubqueryBuilderListener newListener = finalSetOperationBuilder.getSubListener();
        LeafOngoingSetOperationSubqueryBuilderImpl next = new LeafOngoingSetOperationSubqueryBuilderImpl(mainQuery, aliasManager, joinManager.getParent(), expressionFactory, result, newListener, (FinalSetOperationSubqueryBuilderImpl) finalSetOperationBuilder);
        newListener.onBuilderStarted(next);
        return next;
    }

    @SuppressWarnings("unchecked")
    protected  OngoingSetOperationSubqueryBuilderImpl createOngoing(BaseFinalSetOperationSubqueryBuilderImpl finalSetOperationBuilder, W endSetResult) {
        // TODO: This is such an ugly hack, but I don't know how else to fix this generics issue for now
        finalSetOperationBuilder.setEndSetResult((T) endSetResult);
        
        SubqueryBuilderListener newListener = finalSetOperationBuilder.getSubListener();
        OngoingSetOperationSubqueryBuilderImpl next = new OngoingSetOperationSubqueryBuilderImpl(mainQuery, aliasManager, joinManager.getParent(), expressionFactory, result, newListener, (OngoingFinalSetOperationSubqueryBuilderImpl) finalSetOperationBuilder, endSetResult);
        newListener.onBuilderStarted(next);
        return next;
    }
}