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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.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.engine.functions.GroupByFunction;
import io.questdb.griffin.engine.functions.IntFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.Numbers;
import org.jetbrains.annotations.NotNull;

public class MaxIntGroupByFunction extends IntFunction implements GroupByFunction, UnaryFunction {
    private final Function arg;
    private int valueIndex;

    public MaxIntGroupByFunction(@NotNull Function arg) {
        this.arg = arg;
    }

    @Override
    public void computeFirst(MapValue mapValue, Record record, long rowId) {
        mapValue.putInt(valueIndex, arg.getInt(record));
    }

    @Override
    public void computeNext(MapValue mapValue, Record record, long rowId) {
        mapValue.maxInt(valueIndex, arg.getInt(record));
    }

    @Override
    public Function getArg() {
        return arg;
    }

    @Override
    public int getInt(Record rec) {
        return rec.getInt(valueIndex);
    }

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

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

    @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.INT);
    }

    @Override
    public boolean isConstant() {
        return false;
    }

    @Override
    public boolean isThreadSafe() {
        return UnaryFunction.super.isThreadSafe();
    }

    @Override
    public void merge(MapValue destValue, MapValue srcValue) {
        int srcMax = srcValue.getInt(valueIndex);
        int destMax = destValue.getInt(valueIndex);
        if (srcMax > destMax) {
            destValue.putInt(valueIndex, srcMax);
        }
    }

    @Override
    public void setInt(MapValue mapValue, int value) {
        mapValue.putInt(valueIndex, value);
    }

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

    @Override
    public boolean supportsParallelism() {
        return UnaryFunction.super.supportsParallelism();
    }
}