/*******************************************************************************
 * 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
 * ******************************************************************************
 * Jan Källman		Added		21-MAR-2011
 * Jan Källman		License changed GPL-->LGPL 2011-12-16
 *******************************************************************************/

using System;
using System.Globalization;
using System.Xml;

namespace AppsheetEpplus;

/// <summary>
/// A pivo table data field
/// </summary>
public class ExcelPivotTableDataField : XmlHelper {
  internal ExcelPivotTableDataField(
      XmlNamespaceManager ns,
      XmlNode topNode,
      ExcelPivotTableField field)
      : base(ns, topNode) {
    if (topNode.Attributes.Count == 0) {
      Index = field.Index;
      BaseField = 0;
      BaseItem = 0;
    }

    Field = field;
  }

  /// <summary>
  /// The field
  /// </summary>
  public ExcelPivotTableField Field { get; private set; }

  /// <summary>
  /// The index of the datafield
  /// </summary>
  public int Index {
    get => GetXmlNodeInt("@fld");
    internal set => SetXmlNodeString("@fld", value.ToString());
  }

  /// <summary>
  /// The name of the datafield
  /// </summary>
  public string Name {
    get => GetXmlNodeString("@name");
    set {
      if (Field._table.DataFields.ExistsDfName(value, this)) {
        throw (new InvalidOperationException("Duplicate datafield name"));
      }
      SetXmlNodeString("@name", value);
    }
  }

  /// <summary>
  /// Field index. Reference to the field collection
  /// </summary>
  public int BaseField {
    get => GetXmlNodeInt("@baseField");
    set => SetXmlNodeString("@baseField", value.ToString());
  }

  /// <summary>
  /// Specifies the index to the base item when the ShowDataAs calculation is in use
  /// </summary>
  public int BaseItem {
    get => GetXmlNodeInt("@baseItem");
    set => SetXmlNodeString("@baseItem", value.ToString());
  }

  /// <summary>
  /// Number format id.
  /// </summary>
  internal int NumFmtId {
    get => GetXmlNodeInt("@numFmtId");
    set => SetXmlNodeString("@numFmtId", value.ToString());
  }

  /// <summary>
  /// Number format for the data column
  /// </summary>
  public string Format {
    get {
      foreach (var nf in Field._table.WorkSheet.Workbook.Styles.NumberFormats) {
        if (nf.NumFmtId == NumFmtId) {
          return nf.Format;
        }
      }
      return Field._table.WorkSheet.Workbook.Styles.NumberFormats[0].Format;
    }
    set {
      var styles = Field._table.WorkSheet.Workbook.Styles;

      ExcelNumberFormatXml nf = null;
      if (!styles.NumberFormats.FindById(value, ref nf)) {
        nf = new(NameSpaceManager) {
          Format = value,
          NumFmtId = styles.NumberFormats.NextId++,
        };
        styles.NumberFormats.Add(value, nf);
      }
      NumFmtId = nf.NumFmtId;
    }
  }

  /// <summary>
  /// Type of aggregate function
  /// </summary>
  public DataFieldFunctions Function {
    get {
      string s = GetXmlNodeString("@subtotal");
      if (s == "") {
        return DataFieldFunctions.None;
      }
      return (DataFieldFunctions)Enum.Parse(typeof(DataFieldFunctions), s, true);
    }
    set {
      string v;
      switch (value) {
        case DataFieldFunctions.None:
          DeleteNode("@subtotal");
          return;
        case DataFieldFunctions.CountNums:
          v = "CountNums";
          break;
        case DataFieldFunctions.StdDev:
          v = "stdDev";
          break;
        case DataFieldFunctions.StdDevP:
          v = "stdDevP";
          break;
        default:
          v = value.ToString().ToLower(CultureInfo.InvariantCulture);
          break;
      }
      SetXmlNodeString("@subtotal", v);
    }
  }
  /////Since we have no items, Excel will crash when we use showDataAs options that require baseItem's
  //public eShowDataAs ShowDataAs
  //{
  //    get
  //    {
  //        string s = GetXmlNodeString("@showDataAs");
  //        if (s == "")
  //        {
  //            return eShowDataAs.Normal;
  //        }
  //        else
  //        {
  //            return (eShowDataAs)Enum.Parse(typeof(eShowDataAs), s, true);
  //        }
  //    }
  //    set
  //    {
  //        string v = value.ToString();
  //        v = v.Substring(0, 1).ToLower() + v.Substring(1);
  //        SetXmlNodeString("@showDataAs", v);
  //    }
  //}
}