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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
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
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 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.groupby;

import io.questdb.cairo.ArrayColumnTypes;
import io.questdb.cairo.ColumnType;
import io.questdb.cairo.map.MapValue;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.engine.functions.GroupByFunction;
import io.questdb.griffin.engine.functions.LongFunction;
import io.questdb.std.Numbers;

public class CountLongConstGroupByFunction extends LongFunction implements GroupByFunction {
    private int valueIndex;

    @Override
    public int getSampleByFlags() {
        return GroupByFunction.SAMPLE_BY_FILL_ALL;
    }

    @Override
    public void computeFirst(MapValue mapValue, Record record, long rowId) {
        mapValue.putLong(valueIndex, 1);
    }

    @Override
    public void computeNext(MapValue mapValue, Record record, long rowId) {
        mapValue.addLong(valueIndex, 1);
    }

    @Override
    public long getLong(Record rec) {
        return rec.getLong(valueIndex);
    }

    @Override
    public int getValueIndex() {
        return valueIndex;
    }

    @Override
    public void initValueIndex(int valueIndex) {
        this.valueIndex = valueIndex;
    }

    @Override
    public void initValueTypes(ArrayColumnTypes columnTypes) {
        this.valueIndex = columnTypes.getColumnCount();
        columnTypes.add(ColumnType.LONG);
    }

    @Override
    public boolean isThreadSafe() {
        return true;
    }

    @Override
    public void merge(MapValue destValue, MapValue srcValue) {
        long srcCount = srcValue.getLong(valueIndex);
        destValue.addLong(valueIndex, srcCount);
    }

    @Override
    public void setEmpty(MapValue mapValue) {
        mapValue.putLong(valueIndex, 0L);
    }

    @Override
    public void setLong(MapValue mapValue, long value) {
        mapValue.putLong(valueIndex, value);
    }

    @Override
    public void setNull(MapValue mapValue) {
        mapValue.putLong(valueIndex, Numbers.LONG_NULL);
    }

    @Override
    public boolean supportsParallelism() {
        return true;
    }

    @Override
    public void toPlan(PlanSink sink) {
        sink.val("count(*)");
    }
}