/*************************************************************************************************
  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.DateAndTime
{
    [FunctionMetadata(
        Category = ExcelFunctionCategory.DateAndTime,
        EPPlusVersion = "4",
        Description = "Returns the day (of the month) from a user-supplied date",
        SupportsArrays = true)]
    internal class Day : DateParsingFunction
    {
        public override ExcelFunctionArrayBehaviour ArrayBehaviour => ExcelFunctionArrayBehaviour.FirstArgCouldBeARange;

        public override int ArgumentMinLength => 1;
        public override CompileResult Execute(IList<FunctionArgument> arguments, ParsingContext context)
        {
            var dateObj = GetFirstValue(arguments);
            var date = ParseDate(arguments, dateObj, out ExcelErrorValue e1);
            if (e1 != null) return CompileResult.GetErrorResult(e1.Type);

            var aoDate = date.ToOADate();
            if (aoDate < 0)
            {
                return CompileResult.GetErrorResult(eErrorType.Num);
            }
            else if (aoDate < 2)
            {
                return CreateResult(Convert.ToInt32(aoDate)-1, DataType.Integer);
            }
            return CreateResult(date.Day, DataType.Integer);
        }
    }
}
