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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
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 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
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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.LongAdder;

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

public class SumLongVectorAggregateFunction extends LongFunction implements VectorAggregateFunction {
    private final int columnIndex;
    private final LongAdder count = new LongAdder();
    private final DistinctFunc distinctFunc;
    private final KeyValueFunc keyValueFunc;
    private final LongAdder sum = new LongAdder();
    private int valueOffset;

    public SumLongVectorAggregateFunction(int keyKind, int columnIndex, int workerCount) {
        this.columnIndex = columnIndex;
        if (keyKind == GKK_HOUR_INT) {
            distinctFunc = Rosti::keyedHourDistinct;
            keyValueFunc = Rosti::keyedHourSumLong;
        } else {
            distinctFunc = Rosti::keyedIntDistinct;
            keyValueFunc = Rosti::keyedIntSumLong;
        }
    }

    @Override
    public void aggregate(long address, long frameRowCount, int workerId) {
        if (address != 0) {
            final long value = Vect.sumLong(address, frameRowCount);
            if (value != Numbers.LONG_NULL) {
                sum.add(value);
                this.count.increment();
            }
        }
    }

    @Override
    public boolean aggregate(long pRosti, long keyAddress, long valueAddress, long frameRowCount) {
        if (valueAddress == 0) {
            return distinctFunc.run(pRosti, keyAddress, frameRowCount);
        } else {
            return keyValueFunc.run(pRosti, keyAddress, valueAddress, frameRowCount, valueOffset);
        }
    }

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

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

    @Override
    public long getLong(Record rec) {
        if (count.sum() > 0) {
            return sum.sum();
        }
        return Numbers.LONG_NULL;
    }

    @Override
    public String getName() {
        return "sum";
    }

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

    @Override
    public void initRosti(long pRosti) {
        Unsafe.getUnsafe().putLong(Rosti.getInitialValueSlot(pRosti, valueOffset), 0);
        Unsafe.getUnsafe().putLong(Rosti.getInitialValueSlot(pRosti, valueOffset + 1), 0);
    }

    @Override
    public boolean merge(long pRostiA, long pRostiB) {
        return Rosti.keyedIntSumLongMerge(pRostiA, pRostiB, valueOffset);
    }

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

    @Override
    public boolean wrapUp(long pRosti) {
        return Rosti.keyedIntSumLongWrapUp(pRosti, valueOffset, sum.sum(), count.sum());
    }
}