/**
 * 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);
  }
}