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

import io.deephaven.api.updateby.DeltaControl;
import io.deephaven.api.updateby.NullBehavior;
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.rowset.RowSet;
import io.deephaven.engine.table.ColumnSource;
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.BigInteger;

import static io.deephaven.engine.rowset.RowSequence.NULL_ROW_KEY;

public class BigIntegerDeltaOperator extends BaseObjectUpdateByOperator {
    private final DeltaControl control;
    private final ColumnSource inputSource;
    // region extra-fields
    // endregion extra-fields

    protected class Context extends BaseObjectUpdateByOperator.Context {
        public ObjectChunk objectValueChunk;
        private BigInteger lastVal = null;

        protected Context(final int affectedChunkSize, final int influencerChunkSize) {
            super(affectedChunkSize);
        }

        @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);

            // read the value from the values chunk
            final BigInteger currentVal = objectValueChunk.get(pos);

            if (currentVal == null) {
                curVal = null;
            } else if (lastVal == null) {
                curVal = control.nullBehavior() == NullBehavior.NullDominates
                        ? null
                        : (control.nullBehavior() == NullBehavior.ZeroDominates
                            ? BigInteger.ZERO
                            : currentVal);
            } else {
                curVal = currentVal.subtract(lastVal);
            }

            lastVal = currentVal;
        }
    }

    public BigIntegerDeltaOperator(@NotNull final MatchPair pair,
                                   @Nullable final RowRedirection rowRedirection,
                                   @NotNull final DeltaControl control,
                                   @NotNull final ColumnSource inputSource
                                   // region extra-constructor-args
                                   // endregion extra-constructor-args
    ) {
        super(pair, new String[] { pair.rightColumn }, rowRedirection, BigInteger.class);
        this.control = control;
        this.inputSource = inputSource;
        // region constructor
        // endregion constructor
    }

    @Override
    public void initializeCumulative(@NotNull final UpdateByOperator.Context context,
                                     final long firstUnmodifiedKey,
                                     final long firstUnmodifiedTimestamp,
                                     @NotNull final RowSet bucketRowSet) {
        Context ctx = (Context) context;
        ctx.reset();
        if (firstUnmodifiedKey != NULL_ROW_KEY) {
            // Retrieve the value from the input column.
            ctx.lastVal = (BigInteger) inputSource.get(firstUnmodifiedKey);
        } else {
            ctx.lastVal = null;
        }
    }

    // region extra-methods
    // endregion extra-methods

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