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QuestDB is high performance SQL time series database
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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
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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.cast;

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.SqlExecutionContext;
import io.questdb.griffin.engine.functions.constants.VarcharConstant;
import io.questdb.std.*;
import io.questdb.std.datetime.microtime.TimestampFormatUtils;
import io.questdb.std.str.StringSink;
import io.questdb.std.str.Utf8Sequence;
import io.questdb.std.str.Utf8StringSink;

public class CastTimestampToVarcharFunctionFactory implements FunctionFactory {

    @Override
    public String getSignature() {
        return "cast(Nø)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        Function func = args.getQuick(0);
        if (func.isConstant()) {
            StringSink sink = Misc.getThreadLocalSink();
            sink.put(func.getTimestamp(null));
            return new VarcharConstant(Chars.toString(sink));
        }
        return new Func(args.getQuick(0));
    }

    public static class Func extends AbstractCastToVarcharFunction {
        private final Utf8StringSink sinkA = new Utf8StringSink();
        private final Utf8StringSink sinkB = new Utf8StringSink();

        public Func(Function arg) {
            super(arg);
        }

        @Override
        public Utf8Sequence getVarcharA(Record rec) {
            final long value = arg.getTimestamp(rec);
            if (value == Numbers.LONG_NULL) {
                return null;
            }
            sinkA.clear();
            TimestampFormatUtils.appendDateTimeUSec(sinkA, value);
            return sinkA;
        }

        @Override
        public Utf8Sequence getVarcharB(Record rec) {
            final long value = arg.getTimestamp(rec);
            if (value == Numbers.LONG_NULL) {
                return null;
            }
            sinkB.clear();
            TimestampFormatUtils.appendDateTimeUSec(sinkB, value);
            return sinkB;
        }
    }
}