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/**
 * Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 * 
 * Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 * 
 * 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 org.tinygroup.tinysqldsl;

import org.tinygroup.tinysqldsl.base.StatementSqlBuilder;
import org.tinygroup.tinysqldsl.operator.SetOperationInstanceCallBack;
import org.tinygroup.tinysqldsl.select.*;

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

/**
 * 复杂查询
 *
 * @author renhui
 */
public class ComplexSelect> extends
        StatementSqlBuilder implements Statement {

    protected SetOperationList operationList;
    private String id;

    protected ComplexSelect() {
        super();
        operationList = new SetOperationList();
    }

    @SuppressWarnings("rawtypes")
    public static ComplexSelect union(Select... selects) {
        return setOperation(new SetOperationInstanceCallBack() {
            public SetOperation instanceOperation() {
                return new UnionOperation();
            }
        }, selects);
    }

    @SuppressWarnings("rawtypes")
    public static ComplexSelect unionAll(Select... selects) {
        return setOperation(new SetOperationInstanceCallBack() {
            public SetOperation instanceOperation() {
                return new UnionOperation(true);
            }
        }, selects);
    }

    @SuppressWarnings("rawtypes")
    public static ComplexSelect setOperation(
            SetOperationInstanceCallBack instance, Select... selects) {
        ComplexSelect complexSelect = new ComplexSelect();
        List plainSelects = new ArrayList();
        List operations = new ArrayList();
        for (int i = 0; i < selects.length; i++) {
            Select select = selects[i];
            plainSelects.add(select.getPlainSelect());
            if (i != 0) {
                operations.add(instance.instanceOperation());
            }
        }
        complexSelect.operationList.setOpsAndSelects(plainSelects, operations);
        return complexSelect;
    }

    public String getId() {
        return id;
    }

    @SuppressWarnings("unchecked")
    public T orderBy(OrderByElement... orderByElements) {
        operationList.addOrderByElements(orderByElements);
        return (T) this;
    }

    public SetOperationList getOperationList() {
        return operationList;
    }

    @Override
    public String toString() {
        return sql();
    }

    @Override
    protected void parserStatementBody() {
        build(operationList);
    }

    public void id(String id) {
        this.id = id;
    }
}