
/*************************************************************************************************
  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.MathFunctions.RomanFunctions;
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.MathFunctions
{
    [FunctionMetadata(
        Category = ExcelFunctionCategory.MathAndTrig,
        EPPlusVersion = "5.1",
        Description = "Returns a text string depicting the roman numeral for a given number",
        SupportsArrays = true)]
    internal class Roman : ExcelFunction
    {
        public override ExcelFunctionArrayBehaviour ArrayBehaviour => ExcelFunctionArrayBehaviour.FirstArgCouldBeARange;
        public override int ArgumentMinLength => 1;
        public override CompileResult Execute(IList<FunctionArgument> arguments, ParsingContext context)
        {
            var number = ArgToInt(arguments, 0, RoundingMethod.Floor);
            var type = 0;
            if(arguments.Count > 1)
            {
                type = FirstArgumentToInt(arguments, out ExcelErrorValue e1);
                if (e1 != null) return CompileResult.GetErrorResult(e1.Type);
            }
           
            if (type < 0 || type > 4) return CompileResult.GetErrorResult(eErrorType.Value);
            if (number < 0 || number > 3999) return CompileResult.GetErrorResult(eErrorType.Value);
            RomanBase func = new RomanClassic();
            switch (type)
            {
                case 1:
                    func = new RomanForm1();
                    break;
                case 2:
                    func = new RomanForm2();
                    break;
                case 3:
                    func = new RomanForm3();
                    break;
                case 4:
                    func = new RomanSimplified();
                    break;
                default:
                    break;
            }
            return CreateResult(func.Execute(number), DataType.String);
        }
        private int FirstArgumentToInt(IList<FunctionArgument> arguments, out ExcelErrorValue error)
        {
            error = null;
            var arg = arguments[1];

            if (arg.DataType == DataType.Boolean
                && arg.ValueFirst is bool boolValue)
            {
                return boolValue ? 0 : 4;
            }

            return ArgToInt(arguments, 1, out error);
        }
    }
}
