//
// GtkColors.cs
//
// Author:
//   Aaron Bockover <abockover@novell.com>
//
// Copyright (C) 2007-2008 Novell, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using Cairo;
using Gtk;

namespace Hyena.Gui.Theming
{
    public enum GtkColorClass 
    {
        Light,
        Mid,
        Dark,
        Base,
        Text,
        Background,
        Foreground
    }

    public class GtkColors
    {
        private Cairo.Color [] gtk_colors;
        private Widget widget;
        private bool refreshing = false;

        public event EventHandler Refreshed;

        public Widget Widget {
            get { return widget; }
            set { 
                if (widget == value) {
                    return;
                } else if (widget != null) {
                    widget.Realized -= OnWidgetRealized;
                    widget.StyleSet -= OnWidgetStyleSet;
                }

                widget = value;

                if (widget.IsRealized) {
                    RefreshColors ();
                }

                widget.Realized += OnWidgetRealized;
                widget.StyleSet += OnWidgetStyleSet;
            }
        }

        public GtkColors ()
        {
        }

        private void OnWidgetRealized (object o, EventArgs args)
        {
            RefreshColors ();
        }

        private void OnWidgetStyleSet (object o, StyleSetArgs args)
        {
            RefreshColors ();
        }
        
        public Cairo.Color GetWidgetColor (GtkColorClass @class, StateType state)
        {
            if (gtk_colors == null) {
                RefreshColors ();
            }
            
            return gtk_colors[(int)@class * ((int)StateType.Insensitive + 1) + (int)state];
        }
        
        public void RefreshColors ()
        {
            if (refreshing) {
                return;
            }
            
            refreshing = true;
            
            int sn = (int)StateType.Insensitive + 1;
            int cn = (int)GtkColorClass.Foreground + 1;
            
            if (gtk_colors == null) {
                gtk_colors = new Cairo.Color[sn * cn];
            }
                
            for (int c = 0, i = 0; c < cn; c++) {
                for (int s = 0; s < sn; s++, i++) {
                    Gdk.Color color = Gdk.Color.Zero;
                    
                    if (widget != null && widget.IsRealized) {
                        switch ((GtkColorClass)c) {
                            case GtkColorClass.Light:      color = widget.Style.LightColors[s]; break;
                            case GtkColorClass.Mid:        color = widget.Style.MidColors[s];   break;
                            case GtkColorClass.Dark:       color = widget.Style.DarkColors[s];  break;
                            case GtkColorClass.Base:       color = widget.Style.BaseColors[s];  break;
                            case GtkColorClass.Text:       color = widget.Style.TextColors[s];  break;
                            case GtkColorClass.Background: color = widget.Style.Backgrounds[s]; break;
                            case GtkColorClass.Foreground: color = widget.Style.Foregrounds[s]; break;
                        }
                    } else {
                        color = new Gdk.Color (0, 0, 0);
                    }
                    
                    gtk_colors[c * sn + s] = CairoExtensions.GdkColorToCairoColor (color);
                }
            }

            OnRefreshed ();
            
            refreshing = false;
        }

        protected virtual void OnRefreshed ()
        {
            EventHandler handler = Refreshed;
            if (handler != null) {
                handler (this, EventArgs.Empty);
            }
        }
    }
}
