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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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 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.bind;

import io.questdb.cairo.sql.Record;
import io.questdb.cairo.sql.ScalarFunction;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.SqlUtil;
import io.questdb.griffin.engine.functions.VarcharFunction;
import io.questdb.std.Mutable;
import io.questdb.std.Numbers;
import io.questdb.std.datetime.microtime.TimestampFormatUtils;
import io.questdb.std.str.Utf8Sequence;
import io.questdb.std.str.Utf8StringSink;

public class VarcharBindVariable extends VarcharFunction implements ScalarFunction, Mutable {
    private final Utf8StringSink utf8Sink = new Utf8StringSink();
    private boolean isNull = true;

    @Override
    public void clear() {
        isNull = true;
        utf8Sink.clear();
    }

    @Override
    public CharSequence getStrA(Record rec) {
        return isNull ? null : super.getStrA(rec);
    }

    @Override
    public CharSequence getStrB(Record rec) {
        return isNull ? null : super.getStrB(rec);
    }

    @Override
    public int getStrLen(Record rec) {
        if (isNull) {
            return -1;
        }
        return super.getStrLen(rec);
    }

    @Override
    public Utf8Sequence getVarcharA(Record rec) {
        return isNull ? null : utf8Sink;
    }

    @Override
    public Utf8Sequence getVarcharB(Record rec) {
        return isNull ? null : utf8Sink;
    }

    @Override
    public int getVarcharSize(Record rec) {
        if (isNull) {
            return -1;
        }
        return utf8Sink.size();
    }

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

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

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

    public void setTimestamp(long value) {
        isNull = value == Numbers.LONG_NULL;
        if (!isNull) {
            utf8Sink.clear();
            TimestampFormatUtils.appendDateTimeUSec(utf8Sink, value);
        }
    }

    public void setUuidValue(long lo, long hi) {
        utf8Sink.clear();
        if (SqlUtil.implicitCastUuidAsStr(lo, hi, utf8Sink)) {
            isNull = false;
        }
    }

    public void setValue(boolean value) {
        isNull = false;
        utf8Sink.clear();
        utf8Sink.put(value);
    }

    public void setValue(char value) {
        isNull = false;
        utf8Sink.clear();
        utf8Sink.put(value);
    }

    public void setValue(long l0, long l1, long l2, long l3) {
        isNull = false;
        utf8Sink.clear();
        Numbers.appendLong256(l0, l1, l2, l3, utf8Sink);
    }

    public void setValue(short value) {
        isNull = false;
        utf8Sink.clear();
        utf8Sink.put(value);
    }

    public void setValue(byte value) {
        isNull = false;
        utf8Sink.clear();
        utf8Sink.put((int) value);
    }

    public void setValue(long value) {
        isNull = value == Numbers.LONG_NULL;
        if (!isNull) {
            utf8Sink.clear();
            utf8Sink.put(value);
        }
    }

    public void setValue(int value) {
        isNull = value == Numbers.INT_NULL;
        if (!isNull) {
            utf8Sink.clear();
            utf8Sink.put(value);
        }
    }

    public void setValue(double value) {
        isNull = Numbers.isNull(value);
        if (!isNull) {
            utf8Sink.clear();
            utf8Sink.put(value);
        }
    }

    public void setValue(float value) {
        isNull = Numbers.isNull(value);
        if (!isNull) {
            utf8Sink.clear();
            utf8Sink.put(value);
        }
    }

    public void setValue(CharSequence value) {
        if (value == null) {
            isNull = true;
        } else {
            isNull = false;
            utf8Sink.clear();
            utf8Sink.put(value);
        }
    }

    public void setValue(Utf8Sequence value) {
        if (value == null) {
            isNull = true;
        } else {
            isNull = false;
            utf8Sink.clear();
            utf8Sink.put(value);
        }
    }

    @Override
    public void toPlan(PlanSink sink) {
        sink.val("?::varchar");
    }
}