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 *  Copyright (c) 2014-2019 Appsicle
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 *  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.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.LongFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.Numbers;
import org.jetbrains.annotations.NotNull;

public class MinLongGroupByFunction extends LongFunction implements GroupByFunction, UnaryFunction {
    private final Function arg;
    private int valueIndex;

    public MinLongGroupByFunction(int position, @NotNull Function arg) {
        super(position);
        this.arg = arg;
    }

    @Override
    public void computeFirst(MapValue mapValue, Record record) {
        mapValue.putLong(valueIndex, arg.getLong(record));
    }

    @Override
    public void computeNext(MapValue mapValue, Record record) {
        long min = mapValue.getLong(valueIndex);
        long next = arg.getLong(record);
        if (next != Numbers.LONG_NaN && next < min || min == Numbers.LONG_NaN) {
            mapValue.putLong(valueIndex, next);
        }
    }

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

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

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

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

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