/*******************************************************************************
 * 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		        2009-10-01
 * Jan Källman		License changed GPL-->LGPL 2011-12-16
 *******************************************************************************/

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

namespace OfficeOpenXml.Style.XmlAccess;

/// <summary>
/// Xml access class for fonts
/// </summary>
public sealed class ExcelFontXml : StyleXmlHelper {
  internal ExcelFontXml(XmlNamespaceManager nameSpaceManager)
      : base(nameSpaceManager) {
    _name = "";
    _size = 0;
    _family = int.MinValue;
    _scheme = "";
    _color = _color = new(NameSpaceManager);
    _bold = false;
    _italic = false;
    _strike = false;
    _underlineType = ExcelUnderLineType.None;
    _verticalAlign = "";
  }

  internal ExcelFontXml(XmlNamespaceManager nsm, XmlNode topNode)
      : base(nsm, topNode) {
    _name = GetXmlNodeString(_namePath);
    _size = (float)GetXmlNodeDecimal(_sizePath);
    _family = GetXmlNodeIntNull(_familyPath) ?? int.MinValue;
    _scheme = GetXmlNodeString(_schemePath);
    _color = new(nsm, topNode.SelectSingleNode(_colorPath, nsm));
    _bold = GetBoolValue(topNode, _boldPath);
    _italic = GetBoolValue(topNode, _italicPath);
    _strike = GetBoolValue(topNode, _strikePath);
    _verticalAlign = GetXmlNodeString(_verticalAlignPath);
    if (topNode.SelectSingleNode(_underLinedPath, NameSpaceManager) != null) {
      string ut = GetXmlNodeString(_underLinedPath + "/@val");
      if (ut == "") {
        _underlineType = ExcelUnderLineType.Single;
      } else {
        if (!Enum.TryParse(ut, true, out _underlineType)) {
          _underlineType = ExcelUnderLineType.Single;
        }
      }
    } else {
      _underlineType = ExcelUnderLineType.None;
    }
  }

  internal override string Id =>
    Name
        + "|"
        + Size
        + "|"
        + Family
        + "|"
        + Color.Id
        + "|"
        + Scheme
        + "|"
        + Bold
        + "|"
        + Italic
        + "|"
        + Strike
        + "|"
        + VerticalAlign
        + "|"
        + UnderLineType;

  private const string _namePath = "d:name/@val";
  private string _name;

  /// <summary>
  /// The name of the font
  /// </summary>
  public string Name {
    get => _name;
    set {
      Scheme = ""; //Reset schema to avoid corrupt file if unsupported font is selected.
      _name = value;
    }
  }

  private const string _sizePath = "d:sz/@val";
  private float _size;

  /// <summary>
  /// Font size
  /// </summary>
  public float Size {
    get => _size;
    set => _size = value;
  }

  private const string _familyPath = "d:family/@val";
  private int _family;

  /// <summary>
  /// Font family
  /// </summary>
  public int Family {
    get => (_family == int.MinValue ? 0 : _family);
    set => _family = value;
  }

  private ExcelColorXml _color;
  private const string _colorPath = "d:color";

  /// <summary>
  /// Text color
  /// </summary>
  public ExcelColorXml Color {
    get => _color;
    internal set => _color = value;
  }

  private const string _schemePath = "d:scheme/@val";
  private string _scheme = "";

  /// <summary>
  /// Font Scheme
  /// </summary>
  public string Scheme {
    get => _scheme;
    private set => _scheme = value;
  }

  private const string _boldPath = "d:b";
  private bool _bold;

  /// <summary>
  /// If the font is bold
  /// </summary>
  public bool Bold {
    get => _bold;
    set => _bold = value;
  }

  private const string _italicPath = "d:i";
  private bool _italic;

  /// <summary>
  /// If the font is italic
  /// </summary>
  public bool Italic {
    get => _italic;
    set => _italic = value;
  }

  private const string _strikePath = "d:strike";
  private bool _strike;

  /// <summary>
  /// If the font is striked out
  /// </summary>
  public bool Strike {
    get => _strike;
    set => _strike = value;
  }

  private const string _underLinedPath = "d:u";

  /// <summary>
  /// If the font is underlined.
  /// When set to true a the text is underlined with a single line
  /// </summary>
  public bool UnderLine {
    get => UnderLineType != ExcelUnderLineType.None;
    set => _underlineType = value ? ExcelUnderLineType.Single : ExcelUnderLineType.None;
  }

  private ExcelUnderLineType _underlineType;

  /// <summary>
  /// If the font is underlined
  /// </summary>
  public ExcelUnderLineType UnderLineType {
    get => _underlineType;
    set => _underlineType = value;
  }

  private const string _verticalAlignPath = "d:vertAlign/@val";
  private string _verticalAlign;

  /// <summary>
  /// Vertical aligned
  /// </summary>
  public string VerticalAlign {
    get => _verticalAlign;
    set => _verticalAlign = value;
  }

  internal ExcelFontXml Copy() {
    ExcelFontXml newFont = new ExcelFontXml(NameSpaceManager);
    newFont.Name = _name;
    newFont.Size = _size;
    newFont.Family = _family;
    newFont.Scheme = _scheme;
    newFont.Bold = _bold;
    newFont.Italic = _italic;
    newFont.UnderLineType = _underlineType;
    newFont.Strike = _strike;
    newFont.VerticalAlign = _verticalAlign;
    newFont.Color = Color.Copy();
    return newFont;
  }

  internal override XmlNode CreateXmlNode(XmlNode topElement) {
    TopNode = topElement;

    if (_bold) {
      CreateNode(_boldPath);
    } else {
      DeleteAllNode(_boldPath);
    }
    if (_italic) {
      CreateNode(_italicPath);
    } else {
      DeleteAllNode(_italicPath);
    }
    if (_strike) {
      CreateNode(_strikePath);
    } else {
      DeleteAllNode(_strikePath);
    }

    if (_underlineType == ExcelUnderLineType.None) {
      DeleteAllNode(_underLinedPath);
    } else if (_underlineType == ExcelUnderLineType.Single) {
      CreateNode(_underLinedPath);
    } else {
      var v = _underlineType.ToString();
      SetXmlNodeString(
          _underLinedPath + "/@val",
          v.Substring(0, 1).ToLower(CultureInfo.InvariantCulture) + v.Substring(1));
    }

    if (_verticalAlign != "") {
      SetXmlNodeString(_verticalAlignPath, _verticalAlign);
    }
    if (_size > 0) {
      SetXmlNodeString(_sizePath, _size.ToString(CultureInfo.InvariantCulture));
    }
    if (_color.Exists) {
      CreateNode(_colorPath);
      TopNode.AppendChild(
          _color.CreateXmlNode(TopNode.SelectSingleNode(_colorPath, NameSpaceManager)));
    }
    if (!string.IsNullOrEmpty(_name)) {
      SetXmlNodeString(_namePath, _name);
    }
    if (_family > int.MinValue) {
      SetXmlNodeString(_familyPath, _family.ToString());
    }
    if (_scheme != "") {
      SetXmlNodeString(_schemePath, _scheme);
    }

    return TopNode;
  }
}