/*******************************************************************************
 * 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 AppsheetEpplus;

/// <summary>
/// Xml access class xfs records. This is the top level style object.
/// </summary>
public sealed class ExcelXfs : StyleXmlHelper {
  private readonly ExcelStyles _styles;

  internal ExcelXfs(XmlNamespaceManager nameSpaceManager, ExcelStyles styles)
      : base(nameSpaceManager) {
    _styles = styles;
    isBuildIn = false;
  }

  internal ExcelXfs(XmlNamespaceManager nsm, XmlNode topNode, ExcelStyles styles)
      : base(nsm, topNode) {
    _styles = styles;
    _xfID = GetXmlNodeInt("@xfId");
    if (_xfID == 0) {
      isBuildIn = true; //Normal taggen
    }
    _numFmtId = GetXmlNodeInt("@numFmtId");
    _fontId = GetXmlNodeInt("@fontId");
    _fillId = GetXmlNodeInt("@fillId");
    _borderId = GetXmlNodeInt("@borderId");
    _readingOrder = GetReadingOrder(GetXmlNodeString(_readingOrderPath));
    _indent = GetXmlNodeInt(_indentPath);
    _shrinkToFit = GetXmlNodeString(_shrinkToFitPath) == "1" ? true : false;
    _verticalAlignment = GetVerticalAlign(GetXmlNodeString(_verticalAlignPath));
    _horizontalAlignment = GetHorizontalAlign(GetXmlNodeString(_horizontalAlignPath));
    _wrapText = GetXmlNodeBool(_wrapTextPath);
    _textRotation = GetXmlNodeInt(textRotationPath);
    _hidden = GetXmlNodeBool(_hiddenPath);
    _locked = GetXmlNodeBool(_lockedPath, true);
  }

  private ExcelReadingOrder GetReadingOrder(string value) {
    switch (value) {
      case "1":
        return ExcelReadingOrder.LeftToRight;
      case "2":
        return ExcelReadingOrder.RightToLeft;
      default:
        return ExcelReadingOrder.ContextDependent;
    }
  }

  private ExcelHorizontalAlignment GetHorizontalAlign(string align) =>
    Enum.TryParse<ExcelHorizontalAlignment>(align, true, out var result)
        ? result
        : ExcelHorizontalAlignment.General;

  private ExcelVerticalAlignment GetVerticalAlign(string align) =>
    Enum.TryParse<ExcelVerticalAlignment>(align, true, out var result)
        ? result
        : ExcelVerticalAlignment.Bottom;

  private int _xfID;

  /// <summary>
  /// Style index
  /// </summary>
  public int XfId {
    get => _xfID;
    set => _xfID = value;
  }

  private int _numFmtId;

  internal int NumberFormatId {
    get => _numFmtId;
    set {
      _numFmtId = value;
      ApplyNumberFormat = (value > 0);
    }
  }

  private int _fontId;

  internal int FontId {
    get => _fontId;
    set => _fontId = value;
  }

  private int _fillId;

  internal int FillId {
    get => _fillId;
    set => _fillId = value;
  }

  private int _borderId;

  internal int BorderId {
    get => _borderId;
    set => _borderId = value;
  }

  private bool isBuildIn { get; set; }

  internal bool ApplyNumberFormat { get; set; }

  internal bool ApplyFont { get; set; }

  internal bool ApplyFill { get; set; }

  internal bool ApplyBorder { get; set; }

  internal bool ApplyAlignment { get; set; }

  internal bool ApplyProtection { get; set; }

  public ExcelStyles Styles { get; private set; }

  /// <summary>
  /// Numberformat properties
  /// </summary>
  public ExcelNumberFormatXml Numberformat => _styles.NumberFormats[_numFmtId < 0 ? 0 : _numFmtId];

  /// <summary>
  /// Font properties
  /// </summary>
  public ExcelFontXml Font => _styles.Fonts[_fontId < 0 ? 0 : _fontId];

  /// <summary>
  /// Fill properties
  /// </summary>
  public ExcelFillXml Fill => _styles.Fills[_fillId < 0 ? 0 : _fillId];

  /// <summary>
  /// Border style properties
  /// </summary>
  public ExcelBorderXml Border => _styles.Borders[_borderId < 0 ? 0 : _borderId];

  private const string _horizontalAlignPath = "d:alignment/@horizontal";
  private ExcelHorizontalAlignment _horizontalAlignment = ExcelHorizontalAlignment.General;

  /// <summary>
  /// Horizontal alignment
  /// </summary>
  public ExcelHorizontalAlignment HorizontalAlignment {
    get => _horizontalAlignment;
    set => _horizontalAlignment = value;
  }

  private const string _verticalAlignPath = "d:alignment/@vertical";
  private ExcelVerticalAlignment _verticalAlignment = ExcelVerticalAlignment.Bottom;

  /// <summary>
  /// Vertical alignment
  /// </summary>
  public ExcelVerticalAlignment VerticalAlignment {
    get => _verticalAlignment;
    set => _verticalAlignment = value;
  }

  private const string _wrapTextPath = "d:alignment/@wrapText";
  private bool _wrapText;

  /// <summary>
  /// Wraped text
  /// </summary>
  public bool WrapText {
    get => _wrapText;
    set => _wrapText = value;
  }

  private readonly string textRotationPath = "d:alignment/@textRotation";
  private int _textRotation;

  /// <summary>
  /// Text rotation angle
  /// </summary>
  public int TextRotation {
    get => (_textRotation == int.MinValue ? 0 : _textRotation);
    set => _textRotation = value;
  }

  private const string _lockedPath = "d:protection/@locked";
  private bool _locked = true;

  /// <summary>
  /// Locked when sheet is protected
  /// </summary>
  public bool Locked {
    get => _locked;
    set => _locked = value;
  }

  private const string _hiddenPath = "d:protection/@hidden";
  private bool _hidden;

  /// <summary>
  /// Hide formulas when sheet is protected
  /// </summary>
  public bool Hidden {
    get => _hidden;
    set => _hidden = value;
  }

  private const string _readingOrderPath = "d:alignment/@readingOrder";
  private ExcelReadingOrder _readingOrder = ExcelReadingOrder.ContextDependent;

  /// <summary>
  /// Readingorder
  /// </summary>
  public ExcelReadingOrder ReadingOrder {
    get => _readingOrder;
    set => _readingOrder = value;
  }

  private const string _shrinkToFitPath = "d:alignment/@shrinkToFit";
  private bool _shrinkToFit;

  /// <summary>
  /// Shrink to fit
  /// </summary>
  public bool ShrinkToFit {
    get => _shrinkToFit;
    set => _shrinkToFit = value;
  }

  private const string _indentPath = "d:alignment/@indent";
  private int _indent;

  /// <summary>
  /// Indentation
  /// </summary>
  public int Indent {
    get => (_indent == int.MinValue ? 0 : _indent);
    set => _indent = value;
  }

  internal void RegisterEvent(ExcelXfs xf) {
    //                RegisterEvent(xf, xf.Xf_ChangedEvent);
  }

  internal override string Id =>
    XfId
        + "|"
        + NumberFormatId
        + "|"
        + FontId
        + "|"
        + FillId
        + "|"
        + BorderId
        + VerticalAlignment
        + "|"
        + HorizontalAlignment
        + "|"
        + WrapText
        + "|"
        + ReadingOrder
        + "|"
        + isBuildIn
        + TextRotation
        + Locked
        + Hidden
        + ShrinkToFit
        + Indent;

  //return Numberformat.Id + "|" + Font.Id + "|" + Fill.Id + "|" + Border.Id + VerticalAlignment.ToString() + "|" + HorizontalAlignment.ToString() + "|" + WrapText.ToString() + "|" + ReadingOrder.ToString();
  internal ExcelXfs Copy() {
    return Copy(_styles);
  }

  internal ExcelXfs Copy(ExcelStyles styles) {
    ExcelXfs newXf = new ExcelXfs(NameSpaceManager, styles);
    newXf.NumberFormatId = _numFmtId;
    newXf.FontId = _fontId;
    newXf.FillId = _fillId;
    newXf.BorderId = _borderId;
    newXf.XfId = _xfID;
    newXf.ReadingOrder = _readingOrder;
    newXf.HorizontalAlignment = _horizontalAlignment;
    newXf.VerticalAlignment = _verticalAlignment;
    newXf.WrapText = _wrapText;
    newXf.ShrinkToFit = _shrinkToFit;
    newXf.Indent = _indent;
    newXf.TextRotation = _textRotation;
    newXf.Locked = _locked;
    newXf.Hidden = _hidden;
    return newXf;
  }

  internal int GetNewId(
      ExcelStyleCollection<ExcelXfs> xfsCol,
      StyleBase styleObject,
      eStyleClass styleClass,
      eStyleProperty styleProperty,
      object value) {
    ExcelXfs newXfs = Copy();
    switch (styleClass) {
      case eStyleClass.Numberformat:
        newXfs.NumberFormatId = GetIdNumberFormat(styleProperty, value);
        styleObject.SetIndex(newXfs.NumberFormatId);
        break;
      case eStyleClass.Font: {
        newXfs.FontId = GetIdFont(styleProperty, value);
        styleObject.SetIndex(newXfs.FontId);
        break;
      }
      case eStyleClass.Fill:
      case eStyleClass.FillBackgroundColor:
      case eStyleClass.FillPatternColor:
        newXfs.FillId = GetIdFill(styleClass, styleProperty, value);
        styleObject.SetIndex(newXfs.FillId);
        break;
      case eStyleClass.GradientFill:
      case eStyleClass.FillGradientColor1:
      case eStyleClass.FillGradientColor2:
        newXfs.FillId = GetIdGradientFill(styleClass, styleProperty, value);
        styleObject.SetIndex(newXfs.FillId);
        break;
      case eStyleClass.Border:
      case eStyleClass.BorderBottom:
      case eStyleClass.BorderDiagonal:
      case eStyleClass.BorderLeft:
      case eStyleClass.BorderRight:
      case eStyleClass.BorderTop:
        newXfs.BorderId = GetIdBorder(styleClass, styleProperty, value);
        styleObject.SetIndex(newXfs.BorderId);
        break;
      case eStyleClass.Style:
        switch (styleProperty) {
          case eStyleProperty.XfId:
            newXfs.XfId = (int)value;
            break;
          case eStyleProperty.HorizontalAlign:
            newXfs.HorizontalAlignment = (ExcelHorizontalAlignment)value;
            break;
          case eStyleProperty.VerticalAlign:
            newXfs.VerticalAlignment = (ExcelVerticalAlignment)value;
            break;
          case eStyleProperty.WrapText:
            newXfs.WrapText = (bool)value;
            break;
          case eStyleProperty.ReadingOrder:
            newXfs.ReadingOrder = (ExcelReadingOrder)value;
            break;
          case eStyleProperty.ShrinkToFit:
            newXfs.ShrinkToFit = (bool)value;
            break;
          case eStyleProperty.Indent:
            newXfs.Indent = (int)value;
            break;
          case eStyleProperty.TextRotation:
            newXfs.TextRotation = (int)value;
            break;
          case eStyleProperty.Locked:
            newXfs.Locked = (bool)value;
            break;
          case eStyleProperty.Hidden:
            newXfs.Hidden = (bool)value;
            break;
          default:
            throw (new("Invalid property for class style."));
        }
        break;
    }
    int id = xfsCol.FindIndexById(newXfs.Id);
    if (id < 0) {
      return xfsCol.Add(newXfs.Id, newXfs);
    }
    return id;
  }

  private int GetIdBorder(eStyleClass styleClass, eStyleProperty styleProperty, object value) {
    ExcelBorderXml border = Border.Copy();

    switch (styleClass) {
      case eStyleClass.BorderBottom:
        SetBorderItem(border.Bottom, styleProperty, value);
        break;
      case eStyleClass.BorderDiagonal:
        SetBorderItem(border.Diagonal, styleProperty, value);
        break;
      case eStyleClass.BorderLeft:
        SetBorderItem(border.Left, styleProperty, value);
        break;
      case eStyleClass.BorderRight:
        SetBorderItem(border.Right, styleProperty, value);
        break;
      case eStyleClass.BorderTop:
        SetBorderItem(border.Top, styleProperty, value);
        break;
      case eStyleClass.Border:
        if (styleProperty == eStyleProperty.BorderDiagonalUp) {
          border.DiagonalUp = (bool)value;
        } else if (styleProperty == eStyleProperty.BorderDiagonalDown) {
          border.DiagonalDown = (bool)value;
        } else {
          throw (new("Invalid property for class Border."));
        }
        break;
      default:
        throw (new("Invalid class/property for class Border."));
    }
    int subId;
    string id = border.Id;
    subId = _styles.Borders.FindIndexById(id);
    if (subId == int.MinValue) {
      return _styles.Borders.Add(id, border);
    }
    return subId;
  }

  private void SetBorderItem(
      ExcelBorderItemXml excelBorderItem,
      eStyleProperty styleProperty,
      object value) {
    if (styleProperty == eStyleProperty.Style) {
      excelBorderItem.Style = (ExcelBorderStyle)value;
    } else if (styleProperty == eStyleProperty.Color
        || styleProperty == eStyleProperty.Tint
        || styleProperty == eStyleProperty.IndexedColor) {
      if (excelBorderItem.Style == ExcelBorderStyle.None) {
        throw (new("Can't set bordercolor when style is not set."));
      }
      excelBorderItem.Color.Rgb = value.ToString();
    }
  }

  private int GetIdFill(eStyleClass styleClass, eStyleProperty styleProperty, object value) {
    ExcelFillXml fill = Fill.Copy();

    switch (styleProperty) {
      case eStyleProperty.PatternType:
        if (fill is ExcelGradientFillXml) {
          fill = new(NameSpaceManager);
        }
        fill.PatternType = (ExcelFillStyle)value;
        break;
      case eStyleProperty.Color:
      case eStyleProperty.Tint:
      case eStyleProperty.IndexedColor:
      case eStyleProperty.AutoColor:
        if (fill is ExcelGradientFillXml) {
          fill = new(NameSpaceManager);
        }
        if (fill.PatternType == ExcelFillStyle.None) {
          throw (new ArgumentException("Can't set color when patterntype is not set."));
        }
        ExcelColorXml destColor;
        if (styleClass == eStyleClass.FillPatternColor) {
          destColor = fill.PatternColor;
        } else {
          destColor = fill.BackgroundColor;
        }

        if (styleProperty == eStyleProperty.Color) {
          destColor.Rgb = value.ToString();
        } else if (styleProperty == eStyleProperty.Tint) {
          destColor.Tint = (decimal)value;
        } else if (styleProperty == eStyleProperty.IndexedColor) {
          destColor.Indexed = (int)value;
        } else {
          destColor.Auto = (bool)value;
        }

        break;
      default:
        throw (new ArgumentException("Invalid class/property for class Fill."));
    }
    int subId;
    string id = fill.Id;
    subId = _styles.Fills.FindIndexById(id);
    if (subId == int.MinValue) {
      return _styles.Fills.Add(id, fill);
    }
    return subId;
  }

  private int GetIdGradientFill(
      eStyleClass styleClass,
      eStyleProperty styleProperty,
      object value) {
    ExcelGradientFillXml fill;
    if (Fill is ExcelGradientFillXml) {
      fill = (ExcelGradientFillXml)Fill.Copy();
    } else {
      fill = new(Fill.NameSpaceManager);
      fill.GradientColor1.Rgb = "FFFFFFFF";
      fill.GradientColor2.Rgb = "FF4F81BD";
      fill.Type = ExcelFillGradientType.Linear;
      fill.Degree = 90;
      fill.Top = double.NaN;
      fill.Bottom = double.NaN;
      fill.Left = double.NaN;
      fill.Right = double.NaN;
    }

    switch (styleProperty) {
      case eStyleProperty.GradientType:
        fill.Type = (ExcelFillGradientType)value;
        break;
      case eStyleProperty.GradientDegree:
        fill.Degree = (double)value;
        break;
      case eStyleProperty.GradientTop:
        fill.Top = (double)value;
        break;
      case eStyleProperty.GradientBottom:
        fill.Bottom = (double)value;
        break;
      case eStyleProperty.GradientLeft:
        fill.Left = (double)value;
        break;
      case eStyleProperty.GradientRight:
        fill.Right = (double)value;
        break;
      case eStyleProperty.Color:
      case eStyleProperty.Tint:
      case eStyleProperty.IndexedColor:
      case eStyleProperty.AutoColor:
        ExcelColorXml destColor;

        if (styleClass == eStyleClass.FillGradientColor1) {
          destColor = fill.GradientColor1;
        } else {
          destColor = fill.GradientColor2;
        }

        if (styleProperty == eStyleProperty.Color) {
          destColor.Rgb = value.ToString();
        } else if (styleProperty == eStyleProperty.Tint) {
          destColor.Tint = (decimal)value;
        } else if (styleProperty == eStyleProperty.IndexedColor) {
          destColor.Indexed = (int)value;
        } else {
          destColor.Auto = (bool)value;
        }
        break;
      default:
        throw (new ArgumentException("Invalid class/property for class Fill."));
    }
    int subId;
    string id = fill.Id;
    subId = _styles.Fills.FindIndexById(id);
    if (subId == int.MinValue) {
      return _styles.Fills.Add(id, fill);
    }
    return subId;
  }

  private int GetIdNumberFormat(eStyleProperty styleProperty, object value) {
    if (styleProperty == eStyleProperty.Format) {
      ExcelNumberFormatXml item = null;
      if (!_styles.NumberFormats.FindById(value.ToString(), ref item)) {
        item = new(NameSpaceManager) {
          Format = value.ToString(),
          NumFmtId = _styles.NumberFormats.NextId++,
        };
        _styles.NumberFormats.Add(value.ToString(), item);
      }
      return item.NumFmtId;
    }
    throw (new("Invalid property for class Numberformat"));
  }

  private int GetIdFont(eStyleProperty styleProperty, object value) {
    ExcelFontXml fnt = Font.Copy();

    switch (styleProperty) {
      case eStyleProperty.Name:
        fnt.Name = value.ToString();
        break;
      case eStyleProperty.Size:
        fnt.Size = (float)value;
        break;
      case eStyleProperty.Family:
        fnt.Family = (int)value;
        break;
      case eStyleProperty.Bold:
        fnt.Bold = (bool)value;
        break;
      case eStyleProperty.Italic:
        fnt.Italic = (bool)value;
        break;
      case eStyleProperty.Strike:
        fnt.Strike = (bool)value;
        break;
      case eStyleProperty.UnderlineType:
        fnt.UnderLineType = (ExcelUnderLineType)value;
        break;
      case eStyleProperty.Color:
        fnt.Color.Rgb = value.ToString();
        break;
      case eStyleProperty.VerticalAlign:
        fnt.VerticalAlign =
            ((ExcelVerticalAlignmentFont)value) == ExcelVerticalAlignmentFont.None
                ? ""
                : value.ToString().ToLower(CultureInfo.InvariantCulture);
        break;
      default:
        throw (new("Invalid property for class Font"));
    }
    int subId;
    string id = fnt.Id;
    subId = _styles.Fonts.FindIndexById(id);
    if (subId == int.MinValue) {
      return _styles.Fonts.Add(id, fnt);
    }
    return subId;
  }

  internal override XmlNode CreateXmlNode(XmlNode topNode) {
    return CreateXmlNode(topNode, false);
  }

  internal XmlNode CreateXmlNode(XmlNode topNode, bool isCellStyleXsf) {
    TopNode = topNode;
    var doSetXfId =
        (!isCellStyleXsf
            && _xfID > int.MinValue
            && _styles.CellStyleXfs.Count > 0
            && _styles.CellStyleXfs[_xfID].newID > int.MinValue);
    if (_numFmtId > 0) {
      SetXmlNodeString("@numFmtId", _numFmtId.ToString());
      if (doSetXfId) {
        SetXmlNodeString("@applyNumberFormat", "1");
      }
    }
    if (_fontId >= 0) {
      SetXmlNodeString("@fontId", _styles.Fonts[_fontId].newID.ToString());
      if (doSetXfId) {
        SetXmlNodeString("@applyFont", "1");
      }
    }
    if (_fillId >= 0) {
      SetXmlNodeString("@fillId", _styles.Fills[_fillId].newID.ToString());
      if (doSetXfId) {
        SetXmlNodeString("@applyFill", "1");
      }
    }
    if (_borderId >= 0) {
      SetXmlNodeString("@borderId", _styles.Borders[_borderId].newID.ToString());
      if (doSetXfId) {
        SetXmlNodeString("@applyBorder", "1");
      }
    }
    if (_horizontalAlignment != ExcelHorizontalAlignment.General) {
      SetXmlNodeString(_horizontalAlignPath, SetAlignString(_horizontalAlignment));
    }
    if (doSetXfId) {
      SetXmlNodeString("@xfId", _styles.CellStyleXfs[_xfID].newID.ToString());
    }
    if (_verticalAlignment != ExcelVerticalAlignment.Bottom) {
      SetXmlNodeString(_verticalAlignPath, SetAlignString(_verticalAlignment));
    }
    if (_wrapText) {
      SetXmlNodeString(_wrapTextPath, "1");
    }
    if (_readingOrder != ExcelReadingOrder.ContextDependent) {
      SetXmlNodeString(_readingOrderPath, ((int)_readingOrder).ToString());
    }
    if (_shrinkToFit) {
      SetXmlNodeString(_shrinkToFitPath, "1");
    }
    if (_indent > 0) {
      SetXmlNodeString(_indentPath, _indent.ToString());
    }
    if (_textRotation > 0) {
      SetXmlNodeString(textRotationPath, _textRotation.ToString());
    }
    if (!_locked) {
      SetXmlNodeString(_lockedPath, "0");
    }
    if (_hidden) {
      SetXmlNodeString(_hiddenPath, "1");
    }
    return TopNode;
  }

  private string SetAlignString(Enum align) {
    string newName = Enum.GetName(align.GetType(), align);
    return newName.Substring(0, 1).ToLower(CultureInfo.InvariantCulture)
        + newName.Substring(1, newName.Length - 1);
  }
}