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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.orc.reader;

import com.facebook.presto.common.block.Block;
import com.facebook.presto.common.type.Type;
import com.facebook.presto.orc.OrcAggregatedMemoryContext;
import com.facebook.presto.orc.OrcCorruptionException;
import com.facebook.presto.orc.OrcRecordReaderOptions;
import com.facebook.presto.orc.StreamDescriptor;
import com.facebook.presto.orc.Stripe;
import com.facebook.presto.orc.metadata.ColumnEncoding.ColumnEncodingKind;
import com.facebook.presto.orc.stream.InputStreamSources;
import com.google.common.io.Closer;
import org.joda.time.DateTimeZone;
import org.openjdk.jol.info.ClassLayout;

import java.io.IOException;
import java.io.UncheckedIOException;

import static com.facebook.presto.orc.metadata.ColumnEncoding.ColumnEncodingKind.DIRECT;
import static com.facebook.presto.orc.metadata.ColumnEncoding.ColumnEncodingKind.DIRECT_V2;
import static com.facebook.presto.orc.metadata.ColumnEncoding.ColumnEncodingKind.DWRF_DIRECT;
import static com.facebook.presto.orc.metadata.ColumnEncoding.ColumnEncodingKind.DWRF_MAP_FLAT;
import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;

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

    private final StreamDescriptor streamDescriptor;
    private final MapDirectBatchStreamReader directReader;
    private final MapFlatBatchStreamReader flatReader;
    private BatchStreamReader currentReader;

    public MapBatchStreamReader(Type type, StreamDescriptor streamDescriptor, DateTimeZone hiveStorageTimeZone, OrcRecordReaderOptions options, OrcAggregatedMemoryContext systemMemoryContext)
            throws OrcCorruptionException
    {
        this.streamDescriptor = requireNonNull(streamDescriptor, "stream is null");
        this.directReader = new MapDirectBatchStreamReader(type, streamDescriptor, hiveStorageTimeZone, options, systemMemoryContext);
        this.flatReader = new MapFlatBatchStreamReader(type, streamDescriptor, hiveStorageTimeZone, options, systemMemoryContext);
    }

    @Override
    public void prepareNextRead(int batchSize)
    {
        currentReader.prepareNextRead(batchSize);
    }

    @Override
    public Block readBlock()
            throws IOException
    {
        return currentReader.readBlock();
    }

    @Override
    public void startStripe(Stripe stripe)
            throws IOException
    {
        ColumnEncodingKind kind = stripe.getColumnEncodings().get(streamDescriptor.getStreamId())
                .getColumnEncoding(streamDescriptor.getSequence())
                .getColumnEncodingKind();
        if (kind == DIRECT || kind == DIRECT_V2 || kind == DWRF_DIRECT) {
            currentReader = directReader;
        }
        else if (kind == DWRF_MAP_FLAT) {
            currentReader = flatReader;
        }
        else {
            throw new IllegalArgumentException("Unsupported encoding " + kind);
        }

        currentReader.startStripe(stripe);
    }

    @Override
    public void startRowGroup(InputStreamSources dataStreamSources)
            throws IOException
    {
        currentReader.startRowGroup(dataStreamSources);
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .addValue(streamDescriptor)
                .toString();
    }

    @Override
    public void close()
    {
        try (Closer closer = Closer.create()) {
            closer.register(directReader::close);
            closer.register(flatReader::close);
        }
        catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    @Override
    public long getRetainedSizeInBytes()
    {
        return INSTANCE_SIZE + directReader.getRetainedSizeInBytes() + flatReader.getRetainedSizeInBytes();
    }
}