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/*
 * 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 io.prestosql.tests.hive;

import com.google.inject.name.Named;
import io.prestosql.tempto.hadoop.hdfs.HdfsClient;
import org.testng.annotations.Test;

import javax.inject.Inject;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Paths;

import static com.google.common.io.Resources.getResource;
import static io.prestosql.tempto.assertions.QueryAssert.Row.row;
import static io.prestosql.tempto.assertions.QueryAssert.assertThat;
import static io.prestosql.tests.TestGroups.AVRO;
import static io.prestosql.tests.TestGroups.STORAGE_FORMATS;
import static io.prestosql.tests.utils.QueryExecutors.onHive;
import static io.prestosql.tests.utils.QueryExecutors.onPresto;
import static java.lang.String.format;

public class TestParquetSymlinkInputFormat
{
    @Inject
    private HdfsClient hdfsClient;

    @Inject
    @Named("databases.hive.warehouse_directory_path")
    private String warehouseDirectory;

    @Test(groups = STORAGE_FORMATS)
    public void testSymlinkTable()
            throws Exception
    {
        String table = "test_parquet_symlink";
        onHive().executeQuery("DROP TABLE IF EXISTS " + table);

        onHive().executeQuery("" +
                "CREATE TABLE " + table +
                "(value int) " +
                "ROW FORMAT SERDE 'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe' " +
                "STORED AS " +
                "INPUTFORMAT 'org.apache.hadoop.hive.ql.io.SymlinkTextInputFormat' " +
                "OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'");

        String tableRoot = warehouseDirectory + '/' + table;
        String dataDir = warehouseDirectory + "/data_test_parquet_symlink";

        saveResourceOnHdfs("data.parquet", dataDir + "/data.parquet");
        hdfsClient.saveFile(tableRoot + "/symlink.txt", format("hdfs:%s/data.parquet", dataDir));
        assertThat(onPresto().executeQuery("SELECT * FROM " + table)).containsExactly(row(42));

        onHive().executeQuery("DROP TABLE " + table);
        hdfsClient.delete(dataDir);
    }

    @Test(groups = {AVRO, STORAGE_FORMATS})
    public void testSymlinkTableWithMultipleParentDirectories()
            throws Exception
    {
        String table = "test_parquet_symlink_with_multiple_parents";
        onHive().executeQuery("DROP TABLE IF EXISTS " + table);

        onHive().executeQuery("" +
                "CREATE TABLE " + table +
                "(value int) " +
                "ROW FORMAT SERDE 'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe' " +
                "STORED AS " +
                "INPUTFORMAT 'org.apache.hadoop.hive.ql.io.SymlinkTextInputFormat' " +
                "OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'");

        String tableRoot = warehouseDirectory + '/' + table;
        String dataDir = warehouseDirectory + "/data_test_parquet_symlink_with_multiple_parents";
        String anotherDataDir = warehouseDirectory + "/data2_test_parquet_symlink_with_multiple_parents";

        saveResourceOnHdfs("data.parquet", dataDir + "/data.parquet");
        saveResourceOnHdfs("data.parquet", anotherDataDir + "/data.parquet");
        hdfsClient.saveFile(dataDir + "/dontread.txt", "This file will cause an error if read as avro.");
        hdfsClient.saveFile(tableRoot + "/symlink.txt", format("hdfs:%s/data.parquet\nhdfs:%s/data.parquet", dataDir, anotherDataDir));
        assertThat(onPresto().executeQuery("SELECT COUNT(*) as cnt FROM " + table)).containsExactly(row(2));

        onHive().executeQuery("DROP TABLE " + table);
        hdfsClient.delete(dataDir);
        hdfsClient.delete(anotherDataDir);
    }

    private void saveResourceOnHdfs(String resource, String location)
            throws IOException
    {
        hdfsClient.delete(location);
        try (InputStream inputStream = getResource(Paths.get("io/prestosql/tests/hive/data/single_int_column/", resource).toString()).openStream()) {
            hdfsClient.saveFile(location, inputStream);
        }
    }
}