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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.griffin.engine.functions.math;

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.IPv4Function;
import io.questdb.std.IntList;
import io.questdb.std.Numbers;
import io.questdb.std.ObjList;

public class IntPlusIPv4FunctionFactory implements FunctionFactory {

    @Override
    public String getSignature() {
        return "+(IX)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        return new IntPlusIPv4FunctionFactory.IntPlusIPv4Function(args.getQuick(0), args.getQuick(1));
    }

    public static final class IntPlusIPv4Function extends IPv4Function implements BinaryFunction {
        private final Function left;
        private final Function right;

        public IntPlusIPv4Function(Function left, Function right) {
            this.left = left;
            this.right = right;
        }

        @Override
        public int getIPv4(Record rec) {
            final int l = left.getInt(rec);
            final int r = right.getIPv4(rec);

            final long sum = Numbers.ipv4ToLong(l + r);

            if (sum >> 32 != 0) {
                return Numbers.IPv4_NULL;
            }
            return l != Numbers.INT_NULL && r != Numbers.IPv4_NULL ? (int) sum : Numbers.IPv4_NULL;
        }

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

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

        @Override
        public void toPlan(PlanSink sink) {
            sink.val(left).val('+').val(right);
        }
    }
}