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 *  http://www.apache.org/licenses/LICENSE-2.0
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.groupby.vect;

import io.questdb.cairo.ArrayColumnTypes;
import io.questdb.cairo.ColumnType;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.engine.functions.LongFunction;
import io.questdb.std.Numbers;
import io.questdb.std.Rosti;
import io.questdb.std.Unsafe;
import io.questdb.std.Vect;

import java.util.concurrent.atomic.LongAccumulator;
import java.util.function.LongBinaryOperator;

import static io.questdb.griffin.SqlCodeGenerator.GKK_HOUR_INT;

public class MinLongVectorAggregateFunction extends LongFunction implements VectorAggregateFunction {

    public static final LongBinaryOperator MIN = Math::min;
    private final LongAccumulator accumulator = new LongAccumulator(
            MIN, Long.MAX_VALUE
    );
    private final int columnIndex;
    private final DistinctFunc distinctFunc;
    private final KeyValueFunc keyValueFunc;
    private int valueOffset;

    public MinLongVectorAggregateFunction(int position, int keyKind, int columnIndex, int workerCount) {
        super(position);
        this.columnIndex = columnIndex;
        if (keyKind == GKK_HOUR_INT) {
            this.distinctFunc = Rosti::keyedHourDistinct;
            this.keyValueFunc = Rosti::keyedHourMinLong;
        } else {
            this.distinctFunc = Rosti::keyedIntDistinct;
            this.keyValueFunc = Rosti::keyedIntMinLong;
        }
    }

    @Override
    public void pushValueTypes(ArrayColumnTypes types) {
        this.valueOffset = types.getColumnCount();
        types.add(ColumnType.LONG);
    }

    @Override
    public int getValueOffset() {
        return valueOffset;
    }

    @Override
    public void initRosti(long pRosti) {
        Unsafe.getUnsafe().putLong(Rosti.getInitialValueSlot(pRosti, valueOffset), Long.MAX_VALUE);
    }

    @Override
    public void aggregate(long pRosti, long keyAddress, long valueAddress, long count, int workerId) {
        if (valueAddress == 0) {
            distinctFunc.run(pRosti, keyAddress, count);
        } else {
            keyValueFunc.run(pRosti, keyAddress, valueAddress, count, valueOffset);
        }
    }

    @Override
    public void merge(long pRostiA, long pRostiB) {
        Rosti.keyedIntMinLongMerge(pRostiA, pRostiB, valueOffset);
    }

    @Override
    public void wrapUp(long pRosti) {
        Rosti.keyedIntMinLongWrapUp(pRosti, valueOffset, accumulator.longValue());
    }

    @Override
    public void aggregate(long address, long count, int workerId) {
        if (address != 0) {
            final long value = Vect.minLong(address, count);
            if (value != Numbers.LONG_NaN) {
                accumulator.accumulate(value);
            }
        }
    }

    @Override
    public int getColumnIndex() {
        return columnIndex;
    }

    @Override
    public void clear() {
        accumulator.reset();
    }

    @Override
    public long getLong(Record rec) {
        final long value = accumulator.longValue();
        return value == Long.MAX_VALUE ? Numbers.LONG_NaN : value;
    }
}