/*************************************************************************************************
  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 System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OfficeOpenXml.FormulaParsing.Excel.Functions.Metadata;
using OfficeOpenXml.FormulaParsing.FormulaExpressions;

namespace OfficeOpenXml.FormulaParsing.Excel.Functions.Finance
{
    [FunctionMetadata(
        Category = ExcelFunctionCategory.Financial,
        EPPlusVersion = "5.2",
        Description = "Returns the sum-of-years' digits depreciation of an asset for a specified period")]
    internal class Syd : ExcelFunction
    {
        public override int ArgumentMinLength => 4;
        public override CompileResult Execute(IList<FunctionArgument> arguments, ParsingContext context)
        {
            var cost = ArgToDecimal(arguments, 0, out ExcelErrorValue e1);
            if (e1 != null) return CompileResult.GetErrorResult(e1.Type);

            var salvage = ArgToDecimal(arguments, 1, out ExcelErrorValue e2);
            if (e2 != null) return CompileResult.GetErrorResult(e2.Type);

            var life = ArgToDecimal(arguments, 2, out ExcelErrorValue e3);
            if (e3 != null) return CompileResult.GetErrorResult(e3.Type);

            var period = ArgToDecimal(arguments, 3, out ExcelErrorValue e4);
            if (e4 != null) return CompileResult.GetErrorResult(e4.Type);

            if (salvage < 0 || life <= 0 || period <= 0)
                return CompileResult.GetErrorResult(eErrorType.Num);

            var result = (cost - salvage) / (life * (life + 1));
            return CreateResult((result * (life + 1 - period) * 2), DataType.Decimal);
        }

        private static double GetInterest(double rate, double remainingAmount)
        {
            return remainingAmount * rate;
        }
    }
}
