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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 com.facebook.presto.hive;

import com.facebook.presto.hive.RecordFileWriter.ExtendedRecordWriter;
import com.facebook.presto.spi.ConnectorSession;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.exec.FileSinkOperator.RecordWriter;
import org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat;
import org.apache.hadoop.hive.ql.io.parquet.write.ParquetRecordWriterWrapper;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Reporter;
import org.apache.parquet.column.ColumnWriteStore;
import org.apache.parquet.hadoop.ParquetFileWriter;
import org.apache.parquet.hadoop.ParquetOutputFormat;
import org.apache.parquet.hadoop.ParquetRecordWriter;

import java.io.IOException;
import java.lang.reflect.Field;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicReference;

import static com.facebook.presto.hive.HiveSessionProperties.getParquetWriterBlockSize;
import static com.facebook.presto.hive.HiveSessionProperties.getParquetWriterPageSize;

public final class ParquetRecordWriterUtil
{
    private static final Field REAL_WRITER_FIELD;
    private static final Field INTERNAL_WRITER_FIELD;
    private static final Field FILE_WRITER_FIELD;
    // The columnStore field exists in the InternalParquetRecordWriter class
    // which is declared as package-private. This means that we can't access it
    // statically like the other Fields.
    // Initialize this reference once at least one writer has been created
    private static final AtomicReference COLUMN_WRITE_STORE_FIELD;

    static {
        try {
            REAL_WRITER_FIELD = ParquetRecordWriterWrapper.class.getDeclaredField("realWriter");
            INTERNAL_WRITER_FIELD = ParquetRecordWriter.class.getDeclaredField("internalWriter");
            FILE_WRITER_FIELD = INTERNAL_WRITER_FIELD.getType().getDeclaredField("parquetFileWriter");
            COLUMN_WRITE_STORE_FIELD = new AtomicReference<>(null);

            REAL_WRITER_FIELD.setAccessible(true);
            INTERNAL_WRITER_FIELD.setAccessible(true);
            FILE_WRITER_FIELD.setAccessible(true);
        }
        catch (ReflectiveOperationException e) {
            throw new AssertionError(e);
        }
    }

    private ParquetRecordWriterUtil() {}

    public static RecordWriter createParquetWriter(Path target, JobConf conf, Properties properties, boolean compress, ConnectorSession session)
            throws IOException, ReflectiveOperationException
    {
        conf.setLong(ParquetOutputFormat.BLOCK_SIZE, getParquetWriterBlockSize(session).toBytes());
        conf.setLong(ParquetOutputFormat.PAGE_SIZE, getParquetWriterPageSize(session).toBytes());

        RecordWriter recordWriter = new MapredParquetOutputFormat()
                .getHiveRecordWriter(conf, target, Text.class, compress, properties, Reporter.NULL);

        Object realWriter = REAL_WRITER_FIELD.get(recordWriter);
        Object internalWriter = INTERNAL_WRITER_FIELD.get(realWriter);
        COLUMN_WRITE_STORE_FIELD.compareAndSet(null, internalWriter.getClass().getDeclaredField("columnStore"));
        if (COLUMN_WRITE_STORE_FIELD.get() != null && !COLUMN_WRITE_STORE_FIELD.get().isAccessible()) {
            COLUMN_WRITE_STORE_FIELD.get().setAccessible(true);
        }
        ParquetFileWriter fileWriter = (ParquetFileWriter) FILE_WRITER_FIELD.get(internalWriter);
        ColumnWriteStore columnWriteStore = (ColumnWriteStore) COLUMN_WRITE_STORE_FIELD.get().get(internalWriter);

        return new ExtendedRecordWriter()
        {
            private long length;

            @Override
            public long getWrittenBytes()
            {
                return length + columnWriteStore.getBufferedSize();
            }

            @Override
            public void write(Writable value)
                    throws IOException
            {
                recordWriter.write(value);
                length = fileWriter.getPos();
            }

            @Override
            public void close(boolean abort)
                    throws IOException
            {
                recordWriter.close(abort);
                if (!abort) {
                    length = target.getFileSystem(conf).getFileStatus(target).getLen();
                }
            }
        };
    }
}