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QuestDB is high performance SQL time series database
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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.griffin.engine.functions.groupby;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.map.MapValue;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.std.IntList;
import io.questdb.std.Numbers;
import io.questdb.std.ObjList;
import org.jetbrains.annotations.NotNull;

public class FirstNotNullIPv4GroupByFunctionFactory implements FunctionFactory {

    @Override
    public String getSignature() {
        return "first_not_null(X)";
    }

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

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

    private static class Func extends FirstIPv4GroupByFunction {
        public Func(@NotNull Function arg) {
            super(arg);
        }

        @Override
        public void computeNext(MapValue mapValue, Record record, long rowId) {
            if (mapValue.getIPv4(valueIndex + 1) == Numbers.IPv4_NULL) {
                computeFirst(mapValue, record, rowId);
            }
        }

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

        @Override
        public void merge(MapValue destValue, MapValue srcValue) {
            int srcVal = srcValue.getIPv4(valueIndex + 1);
            if (srcVal == Numbers.IPv4_NULL) {
                return;
            }
            long srcRowId = srcValue.getLong(valueIndex);
            long destRowId = destValue.getLong(valueIndex);
            // srcRowId is non-null at this point since we know that the value is non-null
            if (srcRowId < destRowId || destRowId == Numbers.LONG_NULL) {
                destValue.putLong(valueIndex, srcRowId);
                destValue.putInt(valueIndex + 1, srcVal);
            }
        }
    }
}