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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.jsqlparser.util.deparser;

import org.tinygroup.jsqlparser.expression.Expression;
import org.tinygroup.jsqlparser.expression.ExpressionVisitor;
import org.tinygroup.jsqlparser.expression.operators.relational.ExpressionList;
import org.tinygroup.jsqlparser.expression.operators.relational.ItemsListVisitor;
import org.tinygroup.jsqlparser.expression.operators.relational.MultiExpressionList;
import org.tinygroup.jsqlparser.schema.Column;
import org.tinygroup.jsqlparser.statement.insert.Insert;
import org.tinygroup.jsqlparser.statement.select.SelectExpressionItem;
import org.tinygroup.jsqlparser.statement.select.SelectVisitor;
import org.tinygroup.jsqlparser.statement.select.SubSelect;
import org.tinygroup.jsqlparser.statement.select.WithItem;

import java.util.Iterator;

/**
 * A class to de-parse (that is, tranform from JSqlParser hierarchy into a
 * string) an {@link org.tinygroup.jsqlparser.statement.insert.Insert}
 */
public class InsertDeParser implements ItemsListVisitor {

    protected StringBuilder buffer;
    protected ExpressionVisitor expressionVisitor;
    protected SelectVisitor selectVisitor;

    public InsertDeParser() {
    }

    /**
     * @param expressionVisitor a {@link ExpressionVisitor} to de-parse
     * {@link org.tinygroup.jsqlparser.expression.Expression}s. It has to share the
     * same

     * StringBuilder (buffer parameter) as this object in order to work
     * @param selectVisitor a {@link SelectVisitor} to de-parse
     * {@link org.tinygroup.jsqlparser.statement.select.Select}s. It has to share the
     * same

     * StringBuilder (buffer parameter) as this object in order to work
     * @param buffer the buffer that will be filled with the insert
     */
    public InsertDeParser(ExpressionVisitor expressionVisitor, SelectVisitor selectVisitor, StringBuilder buffer) {
        this.buffer = buffer;
        this.expressionVisitor = expressionVisitor;
        this.selectVisitor = selectVisitor;
    }

    public StringBuilder getBuffer() {
        return buffer;
    }

    public void setBuffer(StringBuilder buffer) {
        this.buffer = buffer;
    }

    public void deParse(Insert insert) {
        buffer.append("INSERT INTO ");
        buffer.append(insert.getTable().getFullyQualifiedName());
        if (insert.getColumns() != null) {
            buffer.append(" (");
            for (Iterator iter = insert.getColumns().iterator(); iter.hasNext();) {
                Column column = iter.next();
                buffer.append(column.getColumnName());
                if (iter.hasNext()) {
                    buffer.append(", ");
                }
            }
            buffer.append(")");
        }

        if (insert.getItemsList() != null) {
            insert.getItemsList().accept(this);
        }

        if (insert.getSelect() != null) {
            buffer.append(" ");
            if (insert.isUseSelectBrackets()) {
                buffer.append("(");
            }
            if (insert.getSelect().getWithItemsList() != null) {
                buffer.append("WITH ");
                for (WithItem with : insert.getSelect().getWithItemsList()) {
                    with.accept(selectVisitor);
                }
                buffer.append(" ");
            }
            insert.getSelect().getSelectBody().accept(selectVisitor);
            if (insert.isUseSelectBrackets()) {
                buffer.append(")");
            }
        }

        if (insert.isReturningAllColumns()) {
            buffer.append(" RETURNING *");
        } else if (insert.getReturningExpressionList() != null) {
            buffer.append(" RETURNING ");
            for (Iterator iter = insert.getReturningExpressionList().iterator(); iter.hasNext();) {
                buffer.append(iter.next().toString());
                if (iter.hasNext()) {
                    buffer.append(", ");
                }
            }
        }
    }

   
    public void visit(ExpressionList expressionList) {
        buffer.append(" VALUES (");
        for (Iterator iter = expressionList.getExpressions().iterator(); iter.hasNext();) {
            Expression expression = iter.next();
            expression.accept(expressionVisitor);
            if (iter.hasNext()) {
                buffer.append(", ");
            }
        }
        buffer.append(")");
    }

    
    public void visit(MultiExpressionList multiExprList) {
        buffer.append(" VALUES ");
        for (Iterator it = multiExprList.getExprList().iterator(); it.hasNext();) {
            buffer.append("(");
            for (Iterator iter = it.next().getExpressions().iterator(); iter.hasNext();) {
                Expression expression = iter.next();
                expression.accept(expressionVisitor);
                if (iter.hasNext()) {
                    buffer.append(", ");
                }
            }
            buffer.append(")");
            if (it.hasNext()) {
                buffer.append(", ");
            }
        }
    }

    
    public void visit(SubSelect subSelect) {
        subSelect.getSelectBody().accept(selectVisitor);
    }

    public ExpressionVisitor getExpressionVisitor() {
        return expressionVisitor;
    }

    public SelectVisitor getSelectVisitor() {
        return selectVisitor;
    }

    public void setExpressionVisitor(ExpressionVisitor visitor) {
        expressionVisitor = visitor;
    }

    public void setSelectVisitor(SelectVisitor visitor) {
        selectVisitor = visitor;
    }
}