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/**
 * Copyright (c) 2016-2022 Deephaven Data Labs and Patent Pending
 */
package io.deephaven.engine.table.impl.util.freezeby;

import io.deephaven.chunk.attributes.ChunkLengths;
import io.deephaven.chunk.attributes.ChunkPositions;
import io.deephaven.chunk.attributes.Values;
import io.deephaven.engine.table.WritableColumnSource;
import io.deephaven.engine.table.impl.sources.CharacterArraySource;
import io.deephaven.chunk.*;
import io.deephaven.engine.rowset.RowSequence;
import io.deephaven.engine.rowset.chunkattributes.RowKeys;

class CharFreezeByHelper implements FreezeByOperator.FreezeByHelper {
    private final CharacterArraySource resultSource;
    private final FreezeByCountOperator rowCount;

    CharFreezeByHelper(WritableColumnSource resultSource, FreezeByCountOperator rowCount) {
        this.resultSource = (CharacterArraySource)resultSource;
        this.rowCount = rowCount;
    }

    @Override
    public void addChunk(Chunk values, IntChunk startPositions, IntChunk destinations, IntChunk length) {
        final CharChunk asChar = values.asCharChunk();
        for (int ii = 0; ii < startPositions.size(); ++ii) {
            final int position = startPositions.get(ii);
            final int destination = destinations.get(position);
            // if there is just row churn for a key, we don't want to re-snapshot the value (adds/removes just get ignored)
            if (rowCount.wasDestinationEmpty(destination)) {
                resultSource.set(destination, asChar.get(position));
            }
        }
    }


    @Override
    public void addChunk(Chunk values, long destination) {
        if (rowCount.wasDestinationEmpty(destination)) {
            final CharChunk asChar = values.asCharChunk();
            resultSource.set(destination, asChar.get(0));
        }
    }

    @Override
    public void clearIndex(RowSequence removed) {
        // region clearIndex
        // endregion clearIndex
    }
}