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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.statement.replace;

import org.tinygroup.jsqlparser.expression.Expression;
import org.tinygroup.jsqlparser.expression.operators.relational.ItemsList;
import org.tinygroup.jsqlparser.schema.Column;
import org.tinygroup.jsqlparser.schema.Table;
import org.tinygroup.jsqlparser.statement.Statement;
import org.tinygroup.jsqlparser.statement.StatementVisitor;
import org.tinygroup.jsqlparser.statement.select.PlainSelect;

import java.util.List;

/**
 * The replace statement.
 */
public class Replace implements Statement {

	private Table table;
	private List columns;
	private ItemsList itemsList;
	private List expressions;
	private boolean useValues = true;


	public void accept(StatementVisitor statementVisitor) {
		statementVisitor.visit(this);
	}

	public Table getTable() {
		return table;
	}

	public void setTable(Table name) {
		table = name;
	}

	/**
	 * A list of {@link org.tinygroup.jsqlparser.schema.Column}s either from a "REPLACE
	 * mytab (col1, col2) [...]" or a "REPLACE mytab SET col1=exp1, col2=exp2".
	 *
	 * @return a list of {@link org.tinygroup.jsqlparser.schema.Column}s
	 */
	public List getColumns() {
		return columns;
	}

	/**
	 * An {@link ItemsList} (either from a "REPLACE mytab VALUES (exp1,exp2)" or
	 * a "REPLACE mytab SELECT * FROM mytab2") it is null in case of a "REPLACE
	 * mytab SET col1=exp1, col2=exp2"
	 */
	public ItemsList getItemsList() {
		return itemsList;
	}

	public void setColumns(List list) {
		columns = list;
	}

	public void setItemsList(ItemsList list) {
		itemsList = list;
	}

	/**
	 * A list of {@link org.tinygroup.jsqlparser.expression.Expression}s (from a
	 * "REPLACE mytab SET col1=exp1, col2=exp2"). 

	 * it is null in case of a "REPLACE mytab (col1, col2) [...]"
	 */
	public List getExpressions() {
		return expressions;
	}

	public void setExpressions(List list) {
		expressions = list;
	}

	public boolean isUseValues() {
		return useValues;
	}

	public void setUseValues(boolean useValues) {
		this.useValues = useValues;
	}


	public String toString() {
		StringBuilder sql = new StringBuilder();
		sql.append("REPLACE ").append(table);

		if (expressions != null && columns != null) {
			// the SET col1=exp1, col2=exp2 case
			sql.append(" SET ");
			// each element from expressions match up with a column from columns.
			for (int i = 0, s = columns.size(); i < s; i++) {
				sql.append(columns.get(i)).append("=").append(expressions.get(i));
				sql.append((i < s - 1) ? ", " : "");
			}
		} else if (columns != null) {
			// the REPLACE mytab (col1, col2) [...] case
			sql.append(" ").append(PlainSelect.getStringList(columns, true, true));
		}

		if (itemsList != null) {
			// REPLACE mytab SELECT * FROM mytab2
			// or VALUES ('as', ?, 565)

			if (useValues) {
				sql.append(" VALUES");
			}

			sql.append(" ").append(itemsList);
		}

		return sql.toString();
	}
}