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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.plugin.hive.parquet;

import com.google.common.collect.ImmutableList;
import io.prestosql.parquet.writer.ParquetWriter;
import io.prestosql.parquet.writer.ParquetWriterOptions;
import io.prestosql.plugin.hive.FileWriter;
import io.prestosql.spi.Page;
import io.prestosql.spi.PrestoException;
import io.prestosql.spi.block.Block;
import io.prestosql.spi.block.BlockBuilder;
import io.prestosql.spi.block.RunLengthEncodedBlock;
import io.prestosql.spi.type.Type;
import org.apache.parquet.hadoop.metadata.CompressionCodecName;
import org.apache.parquet.schema.MessageType;
import org.openjdk.jol.info.ClassLayout;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UncheckedIOException;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;

import static com.google.common.base.MoreObjects.toStringHelper;
import static io.prestosql.plugin.hive.HiveErrorCode.HIVE_WRITER_CLOSE_ERROR;
import static io.prestosql.plugin.hive.HiveErrorCode.HIVE_WRITER_DATA_ERROR;
import static java.util.Objects.requireNonNull;

public class ParquetFileWriter
        implements FileWriter
{
    private static final int INSTANCE_SIZE = ClassLayout.parseClass(ParquetFileWriter.class).instanceSize();

    private final ParquetWriter parquetWriter;
    private final Callable rollbackAction;
    private final int[] fileInputColumnIndexes;
    private final List nullBlocks;

    public ParquetFileWriter(
            OutputStream outputStream,
            Callable rollbackAction,
            List fileColumnTypes,
            MessageType messageType,
            Map, Type> primitiveTypes,
            ParquetWriterOptions parquetWriterOptions,
            int[] fileInputColumnIndexes,
            CompressionCodecName compressionCodecName)
    {
        requireNonNull(outputStream, "outputStream is null");

        this.parquetWriter = new ParquetWriter(
                outputStream,
                messageType,
                primitiveTypes,
                parquetWriterOptions,
                compressionCodecName);

        this.rollbackAction = requireNonNull(rollbackAction, "rollbackAction is null");
        this.fileInputColumnIndexes = requireNonNull(fileInputColumnIndexes, "fileInputColumnIndexes is null");

        ImmutableList.Builder nullBlocks = ImmutableList.builder();
        for (Type fileColumnType : fileColumnTypes) {
            BlockBuilder blockBuilder = fileColumnType.createBlockBuilder(null, 1, 0);
            blockBuilder.appendNull();
            nullBlocks.add(blockBuilder.build());
        }
        this.nullBlocks = nullBlocks.build();
    }

    @Override
    public long getWrittenBytes()
    {
        return parquetWriter.getWrittenBytes();
    }

    @Override
    public long getSystemMemoryUsage()
    {
        return INSTANCE_SIZE + parquetWriter.getRetainedBytes();
    }

    @Override
    public void appendRows(Page dataPage)
    {
        Block[] blocks = new Block[fileInputColumnIndexes.length];
        for (int i = 0; i < fileInputColumnIndexes.length; i++) {
            int inputColumnIndex = fileInputColumnIndexes[i];
            if (inputColumnIndex < 0) {
                blocks[i] = new RunLengthEncodedBlock(nullBlocks.get(i), dataPage.getPositionCount());
            }
            else {
                blocks[i] = dataPage.getBlock(inputColumnIndex);
            }
        }
        Page page = new Page(dataPage.getPositionCount(), blocks);
        try {
            parquetWriter.write(page);
        }
        catch (IOException | UncheckedIOException e) {
            throw new PrestoException(HIVE_WRITER_DATA_ERROR, e);
        }
    }

    @Override
    public void commit()
    {
        try {
            parquetWriter.close();
        }
        catch (IOException | UncheckedIOException e) {
            try {
                rollbackAction.call();
            }
            catch (Exception ignored) {
                // ignore
            }
            throw new PrestoException(HIVE_WRITER_CLOSE_ERROR, "Error committing write parquet to Hive", e);
        }
    }

    @Override
    public void rollback()
    {
        try {
            try {
                parquetWriter.close();
            }
            finally {
                rollbackAction.call();
            }
        }
        catch (Exception e) {
            throw new PrestoException(HIVE_WRITER_CLOSE_ERROR, "Error rolling back write parquet to Hive", e);
        }
    }

    @Override
    public long getValidationCpuNanos()
    {
        return 0;
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("writer", parquetWriter)
                .toString();
    }
}