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

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Optional;

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 MapSelectiveStreamReader
        implements SelectiveStreamReader
{
    private static final int INSTANCE_SIZE = ClassLayout.parseClass(MapSelectiveStreamReader.class).instanceSize();

    private final StreamDescriptor streamDescriptor;
    private final MapDirectSelectiveStreamReader directReader;
    private final MapFlatSelectiveStreamReader flatReader;
    private SelectiveStreamReader currentReader;

    public MapSelectiveStreamReader(
            StreamDescriptor streamDescriptor,
            Map filters,
            List requiredSubfields,
            Optional outputType,
            DateTimeZone hiveStorageTimeZone,
            OrcRecordReaderOptions options,
            boolean legacyMapSubscript,
            OrcAggregatedMemoryContext systemMemoryContext)
    {
        this.streamDescriptor = requireNonNull(streamDescriptor, "stream is null");
        directReader = new MapDirectSelectiveStreamReader(streamDescriptor, filters, requiredSubfields, outputType, hiveStorageTimeZone, options, legacyMapSubscript, systemMemoryContext);
        flatReader = new MapFlatSelectiveStreamReader(streamDescriptor, filters, requiredSubfields, outputType, hiveStorageTimeZone, options, legacyMapSubscript, systemMemoryContext);
    }

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

    @Override
    public int read(int offset, int[] positions, int positionCount)
            throws IOException
    {
        return currentReader.read(offset, positions, positionCount);
    }

    @Override
    public int[] getReadPositions()
    {
        return currentReader.getReadPositions();
    }

    @Override
    public Block getBlock(int[] positions, int positionCount)
    {
        return currentReader.getBlock(positions, positionCount);
    }

    @Override
    public BlockLease getBlockView(int[] positions, int positionCount)
    {
        return currentReader.getBlockView(positions, positionCount);
    }

    @Override
    public void throwAnyError(int[] positions, int positionCount)
    {
        currentReader.throwAnyError(positions, positionCount);
    }

    @Override
    public void close()
    {
        directReader.close();
        flatReader.close();
    }
}