/*************************************************************************************************
  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.MathFunctions
{
    [FunctionMetadata(
        Category = ExcelFunctionCategory.Statistical,
        EPPlusVersion = "4",
        Description = "Returns the statistical rank of a given value, within a supplied array of values")]
    internal class Rank : RankFunctionBase
    {
        public Rank()
            : this(false)
        {

        }
        
        public Rank(bool isAvg)
        {
            _isAvg=isAvg;
        }

        private readonly bool _isAvg;

        public override int ArgumentMinLength => 2;
        public override CompileResult Execute(IList<FunctionArgument> arguments, ParsingContext context)
        {
            var number = ArgToDecimal(arguments, 0, out ExcelErrorValue e1);
            if (e1 != null) return CompileResult.GetErrorResult(e1.Type);
            var refArg = arguments[1];
            var sortAscending = arguments.Count > 2 ? ArgToBool(arguments, 2) : false;
            var numbers = GetNumbersFromRange(refArg, sortAscending);
            double rank = numbers.IndexOf(number) + 1;
            if(_isAvg)
            {
                var lastRank = numbers.LastIndexOf(number) + 1;
                rank = rank + ((lastRank - rank) / 2d);
            }
            
            if (rank <= 0 || rank > numbers.Count)
            {
                return CompileResult.GetErrorResult(eErrorType.NA);
            }
            return CreateResult(rank, DataType.Decimal);
        }

        
    }
}
