/*******************************************************************************
 * 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		Initial Release
 * Jan Källman		License changed GPL-->LGPL 2011-12-27
 *******************************************************************************/

using System.Xml;
using OfficeOpenXml.Drawing.Vml;
using OfficeOpenXml.Style;

namespace OfficeOpenXml;

/// <summary>
/// An Excel Cell Comment
/// </summary>
public class ExcelComment : ExcelVmlDrawingComment {
  internal XmlHelper _commentHelper;
  private readonly string _text;

  internal ExcelComment(XmlNamespaceManager ns, XmlNode commentTopNode, ExcelRangeBase cell)
      : base(null, cell, cell.Worksheet.VmlDrawingsComments.NameSpaceManager) {
    //_commentHelper = new XmlHelper(ns, commentTopNode);
    _commentHelper = XmlHelperFactory.Create(ns, commentTopNode);
    var textElem = commentTopNode.SelectSingleNode("d:text", ns);
    if (textElem == null) {
      textElem = commentTopNode.OwnerDocument.CreateElement("text", ExcelPackage._schemaMain);
      commentTopNode.AppendChild(textElem);
    }
    if (!cell.Worksheet._vmlDrawings.ContainsKey(
        ExcelCellBase.GetCellId(cell.Worksheet.SheetID, cell.Start.Row, cell.Start.Column))) {
      cell.Worksheet._vmlDrawings.Add(cell);
    }

    TopNode = cell.Worksheet.VmlDrawingsComments[ExcelCellBase.GetCellId(
          cell.Worksheet.SheetID,
          cell.Start.Row,
          cell.Start.Column)].TopNode;
    RichText = new(ns, textElem);
    var tNode = textElem.SelectSingleNode("d:t", ns);
    if (tNode != null) {
      _text = tNode.InnerText;
    }
  }

  private const string _authorsPath = "d:comments/d:authors";
  private const string _authorPath = "d:comments/d:authors/d:author";

  /// <summary>
  /// Author
  /// </summary>
  public string Author {
    get {
      int authorRef = _commentHelper.GetXmlNodeInt("@authorId");
      return _commentHelper.TopNode.OwnerDocument
          .SelectSingleNode(
              string.Format("{0}[{1}]", _authorPath, authorRef + 1),
              _commentHelper.NameSpaceManager)
          .InnerText;
    }
    set {
      int authorRef = GetAuthor(value);
      _commentHelper.SetXmlNodeString("@authorId", authorRef.ToString());
    }
  }

  private int GetAuthor(string value) {
    int authorRef = 0;
    bool found = false;
    foreach (XmlElement node in _commentHelper.TopNode.OwnerDocument.SelectNodes(
        _authorPath,
        _commentHelper.NameSpaceManager)) {
      if (node.InnerText == value) {
        found = true;
        break;
      }
      authorRef++;
    }
    if (!found) {
      var elem = _commentHelper.TopNode.OwnerDocument.CreateElement(
          "d",
          "author",
          ExcelPackage._schemaMain);
      _commentHelper.TopNode.OwnerDocument
          .SelectSingleNode(_authorsPath, _commentHelper.NameSpaceManager)
          .AppendChild(elem);
      elem.InnerText = value;
    }
    return authorRef;
  }

  /// <summary>
  /// The comment text
  /// </summary>
  public string Text {
    get {
      if (!string.IsNullOrEmpty(RichText.Text)) {
        return RichText.Text;
      }
      return _text;
    }
    set => RichText.Text = value;
  }

  /// <summary>
  /// Sets the font of the first richtext item.
  /// </summary>
  public ExcelRichText Font {
    get {
      if (RichText.Count > 0) {
        return RichText[0];
      }
      return null;
    }
  }

  /// <summary>
  /// Richtext collection
  /// </summary>
  public ExcelRichTextCollection RichText { get; set; }
}