/************************************************************************

   Extended WPF Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 

   This program can be provided to you by Xceed Software Inc. under a
   proprietary commercial license agreement for use in non-Open Source
   projects. The commercial version of Extended WPF Toolkit also includes
   priority technical support, commercial updates, and many additional 
   useful WPF controls if you license Xceed Business Suite for WPF.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Documents;
using System.Windows.Media;
using Xceed.Wpf.Toolkit.Core;
using System.Linq;

namespace Xceed.Wpf.Toolkit
{
  /// <summary>
  /// Interaction logic for RichTextBoxFormatBar.xaml
  /// </summary>
  public partial class RichTextBoxFormatBar : UserControl, IRichTextBoxFormatBar
  {
    #region Properties

    #region RichTextBox

    public static readonly DependencyProperty TargetProperty = DependencyProperty.Register( "Target", typeof( global::System.Windows.Controls.RichTextBox ), typeof( RichTextBoxFormatBar ), new PropertyMetadata( null, OnRichTextBoxPropertyChanged ) );
    public global::System.Windows.Controls.RichTextBox Target
    {
      get
      {
        return ( global::System.Windows.Controls.RichTextBox )GetValue( TargetProperty );
      }
      set
      {
        SetValue( TargetProperty, value );
      }
    }

    private static void OnRichTextBoxPropertyChanged( DependencyObject d, DependencyPropertyChangedEventArgs e )
    {
      RichTextBoxFormatBar formatBar = d as RichTextBoxFormatBar;
    }

    #endregion //RichTextBox

    public static double[] FontSizes
    {
      get
      {
        return new double[] { 
		            3.0, 4.0, 5.0, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 
		            10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 15.0,
		            16.0, 17.0, 18.0, 19.0, 20.0, 22.0, 24.0, 26.0, 28.0, 30.0,
		            32.0, 34.0, 36.0, 38.0, 40.0, 44.0, 48.0, 52.0, 56.0, 60.0, 64.0, 68.0, 72.0, 76.0,
		            80.0, 88.0, 96.0, 104.0, 112.0, 120.0, 128.0, 136.0, 144.0
		            };
      }
    }

    #endregion

    #region Constructors

    public RichTextBoxFormatBar()
    {
      InitializeComponent();
      Loaded += FormatToolbar_Loaded;

      _cmbFontFamilies.ItemsSource = Fonts.SystemFontFamilies.OrderBy( fontFamily => fontFamily.Source );
      _cmbFontSizes.ItemsSource = FontSizes;
    }

    #endregion //Constructors

    #region Event Hanlders

    void FormatToolbar_Loaded( object sender, RoutedEventArgs e )
    {
      Update();
    }

    private void FontFamily_SelectionChanged( object sender, SelectionChangedEventArgs e )
    {
      if( e.AddedItems.Count == 0 )
        return;

      FontFamily editValue = ( FontFamily )e.AddedItems[ 0 ];
      ApplyPropertyValueToSelectedText( TextElement.FontFamilyProperty, editValue );
    }

    private void FontSize_SelectionChanged( object sender, SelectionChangedEventArgs e )
    {
      if( e.AddedItems.Count == 0 )
        return;

      ApplyPropertyValueToSelectedText( TextElement.FontSizeProperty, e.AddedItems[ 0 ] );
    }

    void FontColor_SelectedColorChanged( object sender, RoutedPropertyChangedEventArgs<Color> e )
    {
      Color selectedColor = ( Color )e.NewValue;
      ApplyPropertyValueToSelectedText( TextElement.ForegroundProperty, new SolidColorBrush( selectedColor ) );
    }

    private void FontBackgroundColor_SelectedColorChanged( object sender, RoutedPropertyChangedEventArgs<Color> e )
    {
      Color selectedColor = ( Color )e.NewValue;
      ApplyPropertyValueToSelectedText( TextElement.BackgroundProperty, new SolidColorBrush( selectedColor ) );
    }

    private void Bullets_Clicked( object sender, RoutedEventArgs e )
    {
      if( BothSelectionListsAreChecked() )
      {
        _btnNumbers.IsChecked = false;
      }
    }

    private void Numbers_Clicked( object sender, RoutedEventArgs e )
    {
      if( BothSelectionListsAreChecked() )
      {
        _btnBullets.IsChecked = false;
      }
    }

    private void DragWidget_DragDelta( object sender, DragDeltaEventArgs e )
    {
      ProcessMove( e );
    }

    #endregion //Event Hanlders

    #region Methods

    public void Update()
    {
      UpdateToggleButtonState();
      UpdateSelectedFontFamily();
      UpdateSelectedFontSize();
      UpdateFontColor();
      UpdateFontBackgroundColor();
      UpdateSelectionListType();
    }

    private void UpdateToggleButtonState()
    {
      UpdateItemCheckedState( _btnBold, TextElement.FontWeightProperty, FontWeights.Bold );
      UpdateItemCheckedState( _btnItalic, TextElement.FontStyleProperty, FontStyles.Italic );
      UpdateItemCheckedState( _btnUnderline, Inline.TextDecorationsProperty, TextDecorations.Underline );

      UpdateItemCheckedState( _btnAlignLeft, Paragraph.TextAlignmentProperty, TextAlignment.Left );
      UpdateItemCheckedState( _btnAlignCenter, Paragraph.TextAlignmentProperty, TextAlignment.Center );
      UpdateItemCheckedState( _btnAlignRight, Paragraph.TextAlignmentProperty, TextAlignment.Right );
    }

    void UpdateItemCheckedState( ToggleButton button, DependencyProperty formattingProperty, object expectedValue )
    {
      object currentValue = Target.Selection.GetPropertyValue( formattingProperty );
      button.IsChecked = ( currentValue == DependencyProperty.UnsetValue ) ? false : currentValue != null && currentValue.Equals( expectedValue );
    }

    private void UpdateSelectedFontFamily()
    {
      object value = Target.Selection.GetPropertyValue( TextElement.FontFamilyProperty );
      FontFamily currentFontFamily = ( FontFamily )( ( value == DependencyProperty.UnsetValue ) ? null : value );
      if( currentFontFamily != null )
      {
        _cmbFontFamilies.SelectedItem = currentFontFamily;
      }
    }

    private void UpdateSelectedFontSize()
    {
      object value = Target.Selection.GetPropertyValue( TextElement.FontSizeProperty );
      _cmbFontSizes.SelectedValue = ( value == DependencyProperty.UnsetValue ) ? null : value;
    }

    private void UpdateFontColor()
    {
      object value = Target.Selection.GetPropertyValue( TextElement.ForegroundProperty );
      Color currentColor = ( Color )( ( value == DependencyProperty.UnsetValue ) ? Colors.Black : ( ( SolidColorBrush )value ).Color );
      _cmbFontColor.SelectedColor = currentColor;
    }

    private void UpdateFontBackgroundColor()
    {
      object value = Target.Selection.GetPropertyValue( TextElement.BackgroundProperty );
      Color currentColor = ( Color )( ( value == null || value == DependencyProperty.UnsetValue ) ? Colors.Transparent : ( ( SolidColorBrush )value ).Color );
      _cmbFontBackgroundColor.SelectedColor = currentColor;
    }

    /// <summary>
    /// Updates the visual state of the List styles, such as Numbers and Bullets.
    /// </summary>
    private void UpdateSelectionListType()
    {
      //uncheck both
      _btnBullets.IsChecked = false;
      _btnNumbers.IsChecked = false;

      Paragraph startParagraph = Target.Selection.Start.Paragraph;
      Paragraph endParagraph = Target.Selection.End.Paragraph;
      if( startParagraph != null && endParagraph != null && ( startParagraph.Parent is ListItem ) && ( endParagraph.Parent is ListItem ) && object.ReferenceEquals( ( ( ListItem )startParagraph.Parent ).List, ( ( ListItem )endParagraph.Parent ).List ) )
      {
        TextMarkerStyle markerStyle = ( ( ListItem )startParagraph.Parent ).List.MarkerStyle;
        if( markerStyle == TextMarkerStyle.Disc ) //bullets
        {
          _btnBullets.IsChecked = true;
        }
        else if( markerStyle == TextMarkerStyle.Decimal ) //numbers
        {
          _btnNumbers.IsChecked = true;
        }
      }
    }

    /// <summary>
    /// Checks to see if both selection lists are checked. (Bullets and Numbers)
    /// </summary>
    /// <returns></returns>
    private bool BothSelectionListsAreChecked()
    {
      return _btnBullets.IsChecked == true && _btnNumbers.IsChecked == true;
    }

    void ApplyPropertyValueToSelectedText( DependencyProperty formattingProperty, object value )
    {
      if( value == null )
        return;

      Target.Selection.ApplyPropertyValue( formattingProperty, value );
    }

    private void ProcessMove( DragDeltaEventArgs e )
    {
      AdornerLayer layer = AdornerLayer.GetAdornerLayer( Target );
      UIElementAdorner<Control> adorner = layer.GetAdorners( Target )[ 0 ] as UIElementAdorner<Control>;
      adorner.SetOffsets( adorner.OffsetLeft + e.HorizontalChange, adorner.OffsetTop + e.VerticalChange );
    }

    #endregion //Methods
  }
}