/**
 * 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 java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import junit.framework.TestCase;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;
import org.apache.hadoop.hive.metastore.api.Database;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.Partition;
import org.apache.hadoop.hive.metastore.api.SerDeInfo;
import org.apache.hadoop.hive.metastore.api.StorageDescriptor;
import org.apache.hadoop.hive.metastore.api.Table;
import org.apache.hadoop.hive.ql.io.RCFileInputFormat;
import org.apache.hadoop.hive.ql.io.RCFileOutputFormat;
import org.apache.hadoop.hive.serde.Constants;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TestHCatOutputFormat extends TestCase {

    private static final Logger LOG = LoggerFactory.getLogger(TestHCatOutputFormat.class);
    private HiveMetaStoreClient client;
    private HiveConf hiveConf;

    private static final String dbName = "hcatOutputFormatTestDB";
    private static final String tblName = "hcatOutputFormatTestTable";

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        hiveConf = new HiveConf(this.getClass());

        try {
            client = new HiveMetaStoreClient(hiveConf, null);

            initTable();
        } catch (Throwable e) {
            LOG.error("Unable to open the metastore", e);
            throw new Exception(e);
        }
    }

    @Override
    protected void tearDown() throws Exception {
        try {
            super.tearDown();
            client.dropTable(dbName, tblName);
            client.dropDatabase(dbName);

            client.close();
        } catch (Throwable e) {
            LOG.error("Unable to close metastore", e);
            throw new Exception(e);
        }
    }

    private void initTable() throws Exception {

        try {
            client.dropTable(dbName, tblName);
        } catch (Exception e) {
        }
        try {
            client.dropDatabase(dbName);
        } catch (Exception e) {
        }
        client.createDatabase(new Database(dbName, "", null, null));
        assertNotNull((client.getDatabase(dbName).getLocationUri()));

        List<FieldSchema> fields = new ArrayList<FieldSchema>();
        fields.add(new FieldSchema("colname", Constants.STRING_TYPE_NAME, ""));

        Table tbl = new Table();
        tbl.setDbName(dbName);
        tbl.setTableName(tblName);
        StorageDescriptor sd = new StorageDescriptor();
        sd.setCols(fields);
        tbl.setSd(sd);

        //sd.setLocation("hdfs://tmp");
        sd.setInputFormat(RCFileInputFormat.class.getName());
        sd.setOutputFormat(RCFileOutputFormat.class.getName());
        sd.setParameters(new HashMap<String, String>());
        sd.getParameters().put("test_param_1", "Use this for comments etc");
        //sd.setBucketCols(new ArrayList<String>(2));
        //sd.getBucketCols().add("name");
        sd.setSerdeInfo(new SerDeInfo());
        sd.getSerdeInfo().setName(tbl.getTableName());
        sd.getSerdeInfo().setParameters(new HashMap<String, String>());
        sd.getSerdeInfo().getParameters().put(
                org.apache.hadoop.hive.serde.Constants.SERIALIZATION_FORMAT, "1");
        sd.getSerdeInfo().setSerializationLib(
                org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.class.getName());
        tbl.setPartitionKeys(fields);

        Map<String, String> tableParams = new HashMap<String, String>();
        tableParams.put("hcat.testarg", "testArgValue");

        tbl.setParameters(tableParams);

        client.createTable(tbl);
        Path tblPath = new Path(client.getTable(dbName, tblName).getSd().getLocation());
        assertTrue(tblPath.getFileSystem(hiveConf).mkdirs(new Path(tblPath, "colname=p1")));

    }

    public void testSetOutput() throws Exception {
        Configuration conf = new Configuration();
        Job job = new Job(conf, "test outputformat");

        Map<String, String> partitionValues = new HashMap<String, String>();
        partitionValues.put("colname", "p1");
        //null server url means local mode
        OutputJobInfo info = OutputJobInfo.create(dbName, tblName, partitionValues);

        HCatOutputFormat.setOutput(job, info);
        OutputJobInfo jobInfo = HCatOutputFormat.getJobInfo(job);

        assertNotNull(jobInfo.getTableInfo());
        assertEquals(1, jobInfo.getPartitionValues().size());
        assertEquals("p1", jobInfo.getPartitionValues().get("colname"));
        assertEquals(1, jobInfo.getTableInfo().getDataColumns().getFields().size());
        assertEquals("colname", jobInfo.getTableInfo().getDataColumns().getFields().get(0).getName());

        publishTest(job);
    }

    public void publishTest(Job job) throws Exception {
        OutputCommitter committer = new FileOutputCommitterContainer(job, null);
        committer.cleanupJob(job);

        Partition part = client.getPartition(dbName, tblName, Arrays.asList("p1"));
        assertNotNull(part);

        StorerInfo storer = InternalUtil.extractStorerInfo(part.getSd(), part.getParameters());
        assertEquals(storer.getProperties().get("hcat.testarg"), "testArgValue");
        assertTrue(part.getSd().getLocation().indexOf("p1") != -1);
    }
}