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

import io.deephaven.chunk.attributes.ChunkLengths;
import io.deephaven.chunk.attributes.ChunkPositions;
import io.deephaven.chunk.attributes.Values;
import io.deephaven.engine.table.ChunkSource;
import io.deephaven.engine.table.ColumnSource;
import io.deephaven.engine.table.impl.sources.ObjectArraySource;
import io.deephaven.chunk.*;
import io.deephaven.engine.rowset.RowSequence;
import io.deephaven.engine.rowset.chunkattributes.RowKeys;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Collections;
import java.util.Map;

/**
 * Iterative average operator.
 */
class BigDecimalChunkedReAvgOperator implements IterativeChunkedAggregationOperator {
    private final ObjectArraySource resultColumn;
    private final String name;
    private final BigDecimalChunkedSumOperator sumSum;
    private final LongChunkedSumOperator nncSum;

    BigDecimalChunkedReAvgOperator(String name, BigDecimalChunkedSumOperator sumSum, LongChunkedSumOperator nncSum) {
        this.name = name;
        this.sumSum = sumSum;
        this.nncSum = nncSum;
        resultColumn = new ObjectArraySource<>(BigDecimal.class);
    }

    @Override
    public void addChunk(BucketedContext context, Chunk values,
            LongChunk inputRowKeys, IntChunk destinations,
            IntChunk startPositions, IntChunk length,
            WritableBooleanChunk stateModified) {
        doBucketedUpdate((ReAvgContext) context, destinations, startPositions, stateModified);
    }

    @Override
    public void removeChunk(BucketedContext context, Chunk values,
            LongChunk inputRowKeys, IntChunk destinations,
            IntChunk startPositions, IntChunk length,
            WritableBooleanChunk stateModified) {
        doBucketedUpdate((ReAvgContext) context, destinations, startPositions, stateModified);
    }

    @Override
    public void modifyChunk(BucketedContext context, Chunk previousValues,
            Chunk newValues, LongChunk postShiftRowKeys,
            IntChunk destinations, IntChunk startPositions, IntChunk length,
            WritableBooleanChunk stateModified) {
        doBucketedUpdate((ReAvgContext) context, destinations, startPositions, stateModified);
    }

    private void doBucketedUpdate(ReAvgContext context, IntChunk destinations,
            IntChunk startPositions, WritableBooleanChunk stateModified) {
        try (final RowSequence destinationSeq = context.destinationSequenceFromChunks(destinations, startPositions)) {
            updateResult(context, destinationSeq, stateModified);
        }
    }

    @Override
    public boolean addChunk(SingletonContext context, int chunkSize, Chunk values,
            LongChunk inputRowKeys, long destination) {
        return updateResult(destination);
    }

    @Override
    public boolean removeChunk(SingletonContext context, int chunkSize, Chunk values,
            LongChunk inputRowKeys, long destination) {
        return updateResult(destination);
    }

    @Override
    public boolean modifyChunk(SingletonContext context, int chunkSize, Chunk previousValues,
            Chunk newValues, LongChunk postShiftRowKeys, long destination) {
        return updateResult(destination);
    }

    private boolean updateResult(long destination) {
        final BigDecimal sumSumValue = sumSum.getResult(destination);
        final long nncValue = nncSum.getResult(destination);

        return updateResult(destination, sumSumValue, nncValue);
    }

    private void updateResult(ReAvgContext reAvgContext, RowSequence destinationOk,
            WritableBooleanChunk stateModified) {
        final ObjectChunk sumSumChunk =
                sumSum.getChunk(reAvgContext.sumSumContext, destinationOk).asObjectChunk();
        final LongChunk nncSumChunk =
                nncSum.getChunk(reAvgContext.nncSumContext, destinationOk).asLongChunk();
        final int size = reAvgContext.keyIndices.size();
        final boolean ordered = reAvgContext.ordered;

        for (int ii = 0; ii < size; ++ii) {
            final boolean changed =
                    updateResult(reAvgContext.keyIndices.get(ii), sumSumChunk.get(ii), nncSumChunk.get(ii));
            stateModified.set(ordered ? ii : reAvgContext.statePositions.get(ii), changed);
        }
    }

    private boolean updateResult(long destination, BigDecimal sumSumValue, long nncValue) {
        if (nncValue > 0) {
            final BigDecimal newValue = sumSumValue.divide(BigDecimal.valueOf(nncValue), RoundingMode.HALF_UP);
            return !newValue.equals(resultColumn.getAndSetUnsafe(destination, newValue));
        } else {
            return null != resultColumn.getAndSetUnsafe(destination, null);
        }
    }

    private class ReAvgContext extends ReAvgVarOrderingContext implements BucketedContext {
        final ChunkSource.GetContext sumSumContext;
        final ChunkSource.GetContext nncSumContext;

        private ReAvgContext(int size) {
            super(size);
            sumSumContext = sumSum.makeGetContext(size);
            nncSumContext = nncSum.makeGetContext(size);
        }

        @Override
        public void close() {
            super.close();
            sumSumContext.close();
            nncSumContext.close();
        }
    }

    @Override
    public BucketedContext makeBucketedContext(int size) {
        return new ReAvgContext(size);
    }

    @Override
    public void ensureCapacity(long tableSize) {
        resultColumn.ensureCapacity(tableSize);
    }

    @Override
    public Map> getResultColumns() {
        return Collections.singletonMap(name, resultColumn);
    }

    @Override
    public void startTrackingPrevValues() {
        resultColumn.startTrackingPrevValues();
    }
}