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

   Extended WPF Toolkit

   Copyright (C) 2007-2013 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 

   For more features, controls, and fast professional support,
   pick up the Plus Edition at http://xceed.com/wpf_toolkit

   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids

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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Markup;
using System.Diagnostics;
using System.Xml.Serialization;

namespace Xceed.Wpf.AvalonDock.Layout
{
    [Serializable]
    [ContentProperty("RootPanel")]
    public class LayoutAnchorableFloatingWindow : LayoutFloatingWindow, ILayoutElementWithVisibility
    {
        public LayoutAnchorableFloatingWindow()
        { 

        }

        #region RootPanel

        private LayoutAnchorablePaneGroup _rootPanel = null;
        public LayoutAnchorablePaneGroup RootPanel
        {
            get { return _rootPanel; }
            set
            {
                if (_rootPanel != value)
                {
                    RaisePropertyChanging("RootPanel");

                    if (_rootPanel != null)
                        _rootPanel.ChildrenTreeChanged -= new EventHandler<ChildrenTreeChangedEventArgs>(_rootPanel_ChildrenTreeChanged);

                    _rootPanel = value;
                    if (_rootPanel != null)
                        _rootPanel.Parent = this;

                    if (_rootPanel != null)
                        _rootPanel.ChildrenTreeChanged += new EventHandler<ChildrenTreeChangedEventArgs>(_rootPanel_ChildrenTreeChanged);

                    RaisePropertyChanged("RootPanel");
                    RaisePropertyChanged("IsSinglePane");
                    RaisePropertyChanged("SinglePane");
                    RaisePropertyChanged("Children");
                    RaisePropertyChanged("ChildrenCount");
                    ((ILayoutElementWithVisibility)this).ComputeVisibility();
                }
            }
        }

        void _rootPanel_ChildrenTreeChanged(object sender, ChildrenTreeChangedEventArgs e)
        {
            RaisePropertyChanged("IsSinglePane");
            RaisePropertyChanged("SinglePane");

        }

        public bool IsSinglePane
        {
            get
            {
                return RootPanel != null && RootPanel.Descendents().OfType<ILayoutAnchorablePane>().Where(p => p.IsVisible).Count() == 1;
            }
        }

        public ILayoutAnchorablePane SinglePane
        {
            get
            {
                if (!IsSinglePane)
                    return null;

                var singlePane = RootPanel.Descendents().OfType<LayoutAnchorablePane>().Single(p => p.IsVisible);
                singlePane.UpdateIsDirectlyHostedInFloatingWindow();
                return singlePane;
            }
        }

        #endregion

        public override IEnumerable<ILayoutElement> Children
        {
            get 
            {
                if (ChildrenCount == 1)    
                    yield return RootPanel;

                yield break;
            }
        }

        public override void RemoveChild(ILayoutElement element)
        {
            Debug.Assert(element == RootPanel && element != null);
            RootPanel = null;
        }

        public override void ReplaceChild(ILayoutElement oldElement, ILayoutElement newElement)
        {
            Debug.Assert(oldElement == RootPanel && oldElement != null);
            RootPanel = newElement as LayoutAnchorablePaneGroup;
        }

        public override int ChildrenCount
        {
            get 
            {
                if (RootPanel == null)
                    return 0;
                return 1; 
            }
        }

        #region IsVisible
        [NonSerialized]
        private bool _isVisible = true;

        [XmlIgnore]
        public bool IsVisible
        {
            get { return _isVisible; }
            private set
            {
                if (_isVisible != value)
                {
                    RaisePropertyChanging("IsVisible");
                    _isVisible = value;
                    RaisePropertyChanged("IsVisible");
                    if (IsVisibleChanged != null)
                        IsVisibleChanged(this, EventArgs.Empty);
                }
            }
        }

        public event EventHandler IsVisibleChanged;

        #endregion


        void ILayoutElementWithVisibility.ComputeVisibility()
        {
            if (RootPanel != null)
                IsVisible = RootPanel.IsVisible;
            else
                IsVisible = false;

        }

        public override bool IsValid
        {
            get { return RootPanel != null; }
        }

#if TRACE
        public override void ConsoleDump(int tab)
        {
          System.Diagnostics.Trace.Write( new string( ' ', tab * 4 ) );
          System.Diagnostics.Trace.WriteLine( "FloatingAnchorableWindow()" );

          RootPanel.ConsoleDump(tab + 1);
        }
#endif        
    }
}