/**
 * 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.hcatalog.mapreduce;

import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.hive.cli.CliSessionState;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;
import org.apache.hadoop.hive.ql.Driver;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.pig.PigServer;
import org.junit.Assert;
import org.junit.Before;
import org.junit.BeforeClass;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;

/**
 * Simplify writing HCatalog tests that require a HiveMetaStore.
 */
public class HCatBaseTest {
    protected static final Logger LOG = LoggerFactory.getLogger(HCatBaseTest.class);
    protected static final String TEST_DATA_DIR = System.getProperty("user.dir") +
            "/build/test/data/" + HCatBaseTest.class.getCanonicalName();
    protected static final String TEST_WAREHOUSE_DIR = TEST_DATA_DIR + "/warehouse";

    protected HiveConf hiveConf = null;
    protected Driver driver = null;
    protected HiveMetaStoreClient client = null;

    @BeforeClass
    public static void setUpTestDataDir() throws Exception {
        LOG.info("Using warehouse directory " + TEST_WAREHOUSE_DIR);
        File f = new File(TEST_WAREHOUSE_DIR);
        if (f.exists()) {
            FileUtil.fullyDelete(f);
        }
        Assert.assertTrue(new File(TEST_WAREHOUSE_DIR).mkdirs());
    }

    @Before
    public void setUp() throws Exception {
        if (driver == null) {
            hiveConf = new HiveConf(this.getClass());
            hiveConf.set(HiveConf.ConfVars.PREEXECHOOKS.varname, "");
            hiveConf.set(HiveConf.ConfVars.POSTEXECHOOKS.varname, "");
            hiveConf.set(HiveConf.ConfVars.HIVE_SUPPORT_CONCURRENCY.varname, "false");
            hiveConf.set(HiveConf.ConfVars.METASTOREWAREHOUSE.varname, TEST_WAREHOUSE_DIR);
            driver = new Driver(hiveConf);
            client = new HiveMetaStoreClient(hiveConf);
            SessionState.start(new CliSessionState(hiveConf));
        }
    }

    protected void logAndRegister(PigServer server, String query) throws IOException {
        LOG.info("Registering pig query: " + query);
        server.registerQuery(query);
    }
}