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package io.deephaven.engine.table.impl.updateby.prod;

import io.deephaven.base.verify.Assert;
import io.deephaven.chunk.Chunk;
import io.deephaven.chunk.ObjectChunk;
import io.deephaven.chunk.attributes.Values;
import io.deephaven.engine.table.impl.MatchPair;
import io.deephaven.engine.table.impl.updateby.UpdateByOperator;
import io.deephaven.engine.table.impl.updateby.internal.BaseObjectUpdateByOperator;
import io.deephaven.engine.table.impl.util.RowRedirection;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.math.BigDecimal;
import java.math.MathContext;

public final class BigDecimalCumProdOperator extends BaseObjectUpdateByOperator {
    @NotNull
    private final MathContext mathContext;

    protected class Context extends BaseObjectUpdateByOperator.Context {
        public ObjectChunk objectValueChunk;

        protected Context(final int chunkSize) {
            super(chunkSize);
        }

        @Override
        public void setValueChunks(@NotNull final Chunk[] valueChunks) {
            objectValueChunk = valueChunks[0].asObjectChunk();
        }

        @Override
        public void push(int pos, int count) {
            Assert.eq(count, "push count", 1);

            final BigDecimal val = objectValueChunk.get(pos);

            if (val != null) {
                curVal = curVal == null ? val : curVal.multiply(val, mathContext);
            }
        }

        @Override
        public void reset() {
            curVal = null;
        }
    }

    public BigDecimalCumProdOperator(@NotNull final MatchPair inputPair,
            @Nullable final RowRedirection rowRedirection,
            @NotNull final MathContext mathContext) {
        super(inputPair, new String[] {inputPair.rightColumn}, rowRedirection, BigDecimal.class);
        this.mathContext = mathContext;
    }

    @NotNull
    @Override
    public UpdateByOperator.Context makeUpdateContext(final int affectedChunkSize, final int influencerChunkSize) {
        return new Context(affectedChunkSize);
    }
}