/*************************************************************************************************
  Required Notice: Copyright (C) EPPlus Software AB. 
  This software is licensed under PolyForm Noncommercial License 1.0.0 
  and may only be used for noncommercial purposes 
  https://polyformproject.org/licenses/noncommercial/1.0.0/

  A commercial license to use this software can be purchased at https://epplussoftware.com
 *************************************************************************************************
  Date               Author                       Change
 *************************************************************************************************
  01/27/2020         EPPlus Software AB       Initial release EPPlus 5
 *************************************************************************************************/
using OfficeOpenXml.FormulaParsing.Excel.Functions.Metadata;
using OfficeOpenXml.FormulaParsing.FormulaExpressions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace OfficeOpenXml.FormulaParsing.Excel.Functions.Text
{
    [FunctionMetadata(
        Category = ExcelFunctionCategory.Text,
        EPPlusVersion = "5.0",
        Description = "Returns the Unicode character that is referenced by the given numeric value",
        IntroducedInExcelVersion = "2013")]
    internal class Unichar : ExcelFunction
    {
        public override string NamespacePrefix => "_xlfn.";
        public override int ArgumentMinLength => 1;
        public override CompileResult Execute(IList<FunctionArgument> arguments, ParsingContext context)
        {
            if (
                IsNumeric(arguments.ElementAt(0).Value)
                &&
                short.TryParse(ArgToString(arguments, 0), out short arg))
            {
                return CreateResult(char.ConvertFromUtf32(arg), DataType.Integer);
            }
            return CreateResult(ExcelErrorValue.Values.Value, DataType.ExcelError);
        }
    }
}
