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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.cast;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.cairo.sql.SymbolTable;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.constants.SymbolConstant;
import io.questdb.std.Chars;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;

public class CastCharToSymbolFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "cast(Ak)";
    }

    @Override
    public Function newInstance(int position, ObjList args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) {
        final Function arg = args.getQuick(0);
        if (arg.isConstant()) {
            final char value = arg.getChar(null);
            if (value == 0) {
                return SymbolConstant.NULL;
            }
            return SymbolConstant.newInstance(Chars.toString(value));
        }
        return new Func(arg);
    }

    public static class Func extends AbstractCastToSymbolFunction {

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

        @Override
        public int getInt(Record rec) {
            final char value = arg.getChar(rec);
            if (value == 0) {
                return SymbolTable.VALUE_IS_NULL;
            }
            return getInt0(value);
        }

        @Override
        public CharSequence getSymbol(Record rec) {
            final char value = arg.getChar(rec);
            if (value == 0) {
                return null;
            }

            final int keyIndex = symbolTableShortcut.keyIndex(value);
            if (keyIndex < 0) {
                return symbols.getQuick(symbolTableShortcut.valueAt(keyIndex));
            }

            symbolTableShortcut.putAt(keyIndex, value, next++);
            final String str = Chars.toString(value);
            symbols.add(str);
            return str;
        }

        @Override
        protected AbstractCastToSymbolFunction newFunc() {
            return new Func(arg);
        }
    }
}