/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.kylin.query;

import java.io.File;
import java.sql.SQLException;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.util.Shell;
import org.apache.kylin.common.KylinConfig;
import org.apache.kylin.common.KylinVersion;
import org.apache.kylin.common.util.RandomUtil;
import org.apache.kylin.query.engine.QueryExec;
import org.apache.kylin.query.engine.data.QueryResult;
import org.apache.spark.SparkConf;
import org.apache.spark.sql.SparderEnv;
import org.apache.spark.sql.SparkSession;
import org.apache.spark.sql.internal.StaticSQLConf;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Lists;

import lombok.val;

/**
 * if a query test does not contribute to verifying the correctness of cube data, it should be here
 * otherwise, better consider NAutoBuildAndQueryTest or NManualBuildAndQueryTest
 */
public class NKapQueryTest extends KylinTestBase {

    private static final Logger logger = LoggerFactory.getLogger(NKapQueryTest.class);
    public static final String KYLIN_SQL_BASE_DIR = "../kylin-it/src/test/resources/query";

    protected static SparkConf sparkConf;
    protected static SparkSession ss;

    @Rule
    public ExpectedException thrown = ExpectedException.none();

    @Before
    public void setUp() throws Exception {
        if (Shell.MAC)
            overwriteSystemProp("org.xerial.snappy.lib.name", "libsnappyjava.jnilib");//for snappy
        logger.info("setUp in NKapQueryTest");
        joinType = "left";
        overwriteSystemProp("kylin.query.engine.sparder-enabled", "false");

        createTestMetadata();
        config = KylinConfig.getInstanceFromEnv();
        config.setProperty("kylin.query.security.acl-tcr-enabled", "false");

        sparkConf = new SparkConf().setAppName(RandomUtil.randomUUIDStr()).setMaster("local[4]");
        sparkConf.set("spark.serializer", "org.apache.spark.serializer.JavaSerializer");
        sparkConf.set(StaticSQLConf.CATALOG_IMPLEMENTATION().key(), "in-memory");
        sparkConf.set("spark.sql.shuffle.partitions", "1");

        ss = SparkSession.builder().config(sparkConf).getOrCreate();
        SparderEnv.setSparkSession(ss);

    }

    @After
    public void tearDown() throws Exception {
        logger.info("tearDown in NKapQueryTest");
        cleanupTestMetadata();
    }

    @Test
    public void testQuery_cubeNonAggDisabled_throwNoRealization() throws Exception {
        thrown.expect(SQLException.class);
        thrown.expectMessage("No realization");
        String x = KylinConfig.getInstanceFromEnv().getPushDownRunnerClassName();
        try {
            overwriteSystemProp("kylin.query.engine.sparder-enabled", "true");
            KylinConfig.getInstanceFromEnv().setProperty("kylin.query.pushdown.runner-class-name", "");
            KylinConfig.getInstanceFromEnv().setProperty("kylin.query.pushdown-enabled", "false");

            File tempFile = File.createTempFile("testQuery_cubeNonAggDisabled_throwNoRealization", "sqlfile");
            tempFile.deleteOnExit();
            FileUtils.writeStringToFile(tempFile, "select * from test_kylin_fact", false);
            runSQL(tempFile, false, false);
        } finally {
            KylinConfig.getInstanceFromEnv().setProperty("kylin.query.pushdown.runner-class-name", x);
            if (StringUtils.isEmpty(x)) {
                KylinConfig.getInstanceFromEnv().setProperty("kylin.query.pushdown-enabled", "false");
            } else {
                KylinConfig.getInstanceFromEnv().setProperty("kylin.query.pushdown-enabled", "true");
            }
        }
    }

    @Test
    public void testQuery_validSql_fail() throws Exception {

        logger.info("-------------------- Test Invalid Query --------------------");
        String queryFolder = KYLIN_SQL_BASE_DIR + File.separator + "sql_invalid";
        List<File> sqlFiles = getFilesFromFolder(new File(queryFolder), ".sql");
        for (File sqlFile : sqlFiles) {
            logger.info("Testing Invalid Query: " + sqlFile.getCanonicalPath());
            try {
                runSQL(sqlFile, false, false);
            } catch (Throwable t) {
                continue;
            }
            throw new IllegalStateException(sqlFile.getName() + " should not pass!");
        }
    }

    @Test
    public void testSpecialPurposeQueries() throws Exception {

        List<String> queries = Lists.newArrayList("SELECT VERSION() AS ret", "SELECT 'Hello world' AS ret");
        List<String> expectedAnswers = Lists.newArrayList(KylinVersion.getCurrentVersion().toString(), "Hello world");

        for (int i = 0; i < queries.size(); i++) {

            String query = queries.get(i);
            // execute Kylin
            logger.info("Comparing query at position {} ", i);
            QueryResult queryResult = new QueryExec(getProject(), KylinConfig.getInstanceFromEnv()).executeQuery(query);

            // compare the result
            Assert.assertEquals(expectedAnswers.get(i), queryResult.getRows().get(0).get(0));
        }
    }

    @Test
    public void testConstantQuery() throws Exception {
        val query0 = "select {FN WEEK(CEIL( FLOOR(date'2020-11-10' TO week  ) TO DAY    )) }";
        val query1 = "select floor(date'2020-11-10' to week)";
        val query2 = "select ceil(date'2020-11-10' to month)";
        val query3 = "select 1 union select 4 order by 1";
        val queries = Lists.newArrayList(query0, query1, query2, query3);
        val expectedAnswers = Lists.newArrayList("46", "2020-11-09 00:00:00", "2020-12-01 00:00:00", "1");

        for (int i = 0; i < queries.size(); i++) {
            val query = queries.get(i);
            val queryResult = new QueryExec(getProject(), KylinConfig.getInstanceFromEnv()).executeQuery(query);
            Assert.assertEquals(expectedAnswers.get(i), queryResult.getRows().get(0).get(0));
        }
    }
}
