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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.schema.Column;
import org.tinygroup.jsqlparser.statement.select.Join;
import org.tinygroup.jsqlparser.statement.select.PlainSelect;
import org.tinygroup.jsqlparser.statement.select.Select;
import org.tinygroup.jsqlparser.statement.select.SelectVisitor;
import org.tinygroup.jsqlparser.statement.update.Update;

/**
 * A class to de-parse (that is, tranform from JSqlParser hierarchy into a
 * string) an {@link org.tinygroup.jsqlparser.statement.update.Update}
 */
public class UpdateDeParser {

    protected StringBuilder buffer;
    protected ExpressionVisitor expressionVisitor;
    protected SelectVisitor selectVisitor;
    
    public UpdateDeParser() {
		super();
	}

	/**
     * @param expressionVisitor a {@link ExpressionVisitor} to de-parse
     * expressions. 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 select
     */
    public UpdateDeParser(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(Update update) {
        buffer.append("UPDATE ").append(PlainSelect.getStringList(update.getTables(), true, false)).append(" SET ");

        if (!update.isUseSelect()) {
            for (int i = 0; i < update.getColumns().size(); i++) {
                Column column = update.getColumns().get(i);
                buffer.append(column.getFullyQualifiedName()).append(" = ");

                Expression expression = update.getExpressions().get(i);
                expression.accept(expressionVisitor);
                if (i < update.getColumns().size() - 1) {
                    buffer.append(", ");
                }
            }
        } else {
            if (update.isUseColumnsBrackets()) {
                buffer.append("(");
            }
            for (int i = 0; i < update.getColumns().size(); i++) {
                if (i != 0) {
                    buffer.append(", ");
                }
                Column column = update.getColumns().get(i);
                buffer.append(column.getFullyQualifiedName());
            }
            if (update.isUseColumnsBrackets()) {
                buffer.append(")");
            }
            buffer.append(" = ");
            buffer.append("(");
            Select select = update.getSelect();
            select.getSelectBody().accept(selectVisitor);
            buffer.append(")");
        }

        if (update.getFromItem() != null) {
            buffer.append(" FROM ").append(update.getFromItem());
            if (update.getJoins() != null) {
                for (Join join : update.getJoins()) {
                    if (join.isSimple()) {
                        buffer.append(", ").append(join);
                    } else {
                        buffer.append(" ").append(join);
                    }
                }
            }
        }

        if (update.getWhere() != null) {
            buffer.append(" WHERE ");
            update.getWhere().accept(expressionVisitor);
        }

    }

    public ExpressionVisitor getExpressionVisitor() {
        return expressionVisitor;
    }

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