/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 * See the GNU Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied. 
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 * 
 * Author							Change						Date
 * ******************************************************************************
 * Mats Alm   		                Added       		        2013-03-01 (Prior file history on https://github.com/swmal/ExcelFormulaParser)
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using OfficeOpenXml.Utils;

namespace OfficeOpenXml.FormulaParsing.ExpressionGraph
{
    public class CompileResult
    {
        private static CompileResult _empty = new CompileResult(null, DataType.Empty);

        public static CompileResult Empty
        {
            get { return _empty; }
        }

		private double? _ResultNumeric;

        public CompileResult(object result, DataType dataType)
        {
            Result = result;
            DataType = dataType;
        }

        public CompileResult(eErrorType errorType)
        {
            Result = ExcelErrorValue.Create(errorType);
            DataType = DataType.ExcelError;
        }

        public CompileResult(ExcelErrorValue errorValue)
        {
            Require.Argument(errorValue).IsNotNull("errorValue");
            Result = errorValue;
            DataType = DataType.ExcelError;
        }

        public object Result
        {
            get;
            private set;
        }

        public object ResultValue
        {
            get
            {
                var r = Result as ExcelDataProvider.IRangeInfo;
                if (r == null)
                {
                    return Result;
                }
                else
                {
                    return r.GetValue(r.Address._fromRow, r.Address._fromCol);
                }
            }
        }

        public double ResultNumeric
        {
            get
            {
				// We assume that Result does not change unless it is a range.
				if (_ResultNumeric == null)
				{
					if (IsNumeric)
					{
						_ResultNumeric = Result == null ? 0 : Convert.ToDouble(Result);
					}
					else if (Result is DateTime)
					{
						_ResultNumeric = ((DateTime)Result).ToOADate();
					}
					else if (Result is TimeSpan)
					{
						_ResultNumeric = DateTime.FromOADate(0).Add((TimeSpan)Result).ToOADate();
					}
					else if (Result is ExcelDataProvider.IRangeInfo)
					{
						var c = ((ExcelDataProvider.IRangeInfo)Result).FirstOrDefault();
						if (c == null)
						{
							return 0;
						}
						else
						{
							return c.ValueDoubleLogical;
						}
					}
					// The IsNumericString and IsDateString properties will set _ResultNumeric for efficiency so we just need
					// to check them here.
					else if (!IsNumericString && !IsDateString)
					{
						_ResultNumeric = 0;
					}
				}
				return _ResultNumeric.Value;
            }
        }

        public DataType DataType
        {
            get;
            private set;
        }
        
        public bool IsNumeric
        {
            get 
            {
                return DataType == DataType.Decimal || DataType == DataType.Integer || DataType == DataType.Empty || DataType == DataType.Boolean || DataType == DataType.Date; 
            }
        }

        public bool IsNumericString
        {
            get
            {
				double result;
				if (DataType == DataType.String && ConvertUtil.TryParseNumericString(Result, out result))
				{
					_ResultNumeric = result;
					return true;
				}
				return false;
            }
        }

		public bool IsDateString
		{
			get
			{
				DateTime result;
				if (DataType == DataType.String && ConvertUtil.TryParseDateString(Result, out result))
				{
					_ResultNumeric = result.ToOADate();
					return true;
				}
				return false;
			}
		}

		public bool IsResultOfSubtotal { get; set; }

        public bool IsHiddenCell { get; set; }
    }
}
