/*
 * Copyright 1999-2017 Alibaba Group Holding Ltd.
 *
 * 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.alibaba.druid.bvt.sql.oracle;

import org.junit.Assert;
import junit.framework.TestCase;

import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
import com.alibaba.druid.sql.test.TestUtils;

public class OracleSubqueryFactoringTest extends TestCase {

    public void test_interval() throws Exception {
        String sql = "WITH dept_costs AS (\n"
                     + "SELECT department_name, SUM(salary) dept_total\n"
                     + "FROM employees e, departments d\n"
                     + "WHERE e.department_id = d.department_id\n"
                     + "GROUP BY department_name), "
                     + "avg_cost AS (SELECT SUM(dept_total)/COUNT(*) avg FROM dept_costs)\n"
                     + "SELECT * FROM dept_costs WHERE dept_total > (SELECT avg FROM avg_cost) ORDER BY department_name;";

        String expected = "WITH\n" //
                          + "\tdept_costs\n" //
                          + "\tAS\n" //
                          + "\t(\n"//
                          + "\t\tSELECT department_name, SUM(salary) AS dept_total\n" //
                          + "\t\tFROM employees e, departments d\n"//
                          + "\t\tWHERE e.department_id = d.department_id\n" //
                          + "\t\tGROUP BY department_name\n" //
                          + "\t), \n" //
                          + "\tavg_cost\n" //
                          + "\tAS\n"//
                          + "\t(\n" //
                          + "\t\tSELECT SUM(dept_total) / COUNT(*) AS avg\n" //
                          + "\t\tFROM dept_costs\n" //
                          + "\t)\n" //
                          + "SELECT *\n" //
                          + "FROM dept_costs\n" //
                          + "WHERE dept_total > (\n" //
                          + "\tSELECT avg\n" //
                          + "\tFROM avg_cost\n" //
                          + "\t)\n" //
                          + "ORDER BY department_name;\n";

        OracleStatementParser parser = new OracleStatementParser(sql);
        SQLSelectStatement stmt = (SQLSelectStatement) parser.parseStatementList().get(0);

        String text = TestUtils.outputOracle(stmt);

        Assert.assertEquals(expected, text);

        System.out.println(text);
    }

}