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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
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 *  you may not use this file except in compliance with the License.
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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.conditional;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BinaryFunction;
import io.questdb.griffin.engine.functions.IntFunction;
import io.questdb.std.IntList;
import io.questdb.std.Numbers;
import io.questdb.std.ObjList;

public class NullIfIntFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "nullif(II)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        return new NullIfIntFunction(args.getQuick(0), args.getQuick(1));
    }

    private static class NullIfIntFunction extends IntFunction implements BinaryFunction {
        private final Function intFunc1;
        private final Function intFunc2;

        public NullIfIntFunction(Function intFunc1, Function intFunc2) {
            this.intFunc1 = intFunc1;
            this.intFunc2 = intFunc2;
        }

        @Override
        public int getInt(Record rec) {
            return intFunc1.getInt(rec) == intFunc2.getInt(rec) ? Numbers.INT_NULL : intFunc1.getInt(rec);
        }

        @Override
        public Function getLeft() {
            return intFunc1;
        }

        @Override
        public Function getRight() {
            return intFunc2;
        }

        @Override
        public void toPlan(PlanSink sink) {
            sink.val("nullif(").val(intFunc1).val(',').val(intFunc2).val(')');
        }
    }
}