#region License

// Copyright (c) 2010, Jasper Yeh.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, 
// are permitted provided that the following conditions are met:
//
//    * Redistributions of source code must retain the above copyright notice, 
//      this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above copyright notice, 
//      this list of conditions and the following disclaimer in the documentation 
//      and/or other materials provided with the distribution.
//    * Neither the name of ClearCanvas Inc. nor the names of its contributors 
//      may be used to endorse or promote products derived from this software without 
//      specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 
// OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
// OF SUCH DAMAGE.

#endregion

using System;
using System.ComponentModel;
using System.Windows;
using ClearCanvas.Common;
using ClearCanvas.Desktop;
using ClearCanvas.Desktop.Actions;
using Nullstack.ClearCanvasEx.DesktopEx.View.WpfAdapter.Utilities;

namespace Nullstack.ClearCanvasEx.DesktopEx.View.WpfAdapter
{
	/// <summary>
	/// WPF implementation of <see cref="IDesktopWindowView"/>. 
	/// </summary>
	/// <remarks>
	/// <para>
	/// This class may subclassed if customization is desired.  In this case, the <see cref="WpfApplicationView"/>
	/// class must also be subclassed in order to instantiate the subclass from 
	/// its <see cref="WpfApplicationView.CreateDesktopWindowView"/> method.
	/// </para>
	/// </remarks>
	public class DesktopWindowView : DesktopObjectView, IDesktopWindowView
	{
		private static OrderedSet<DesktopWindowView> _desktopWindowActivationOrder = new OrderedSet<DesktopWindowView>();
		private OrderedSet<WorkspaceView> _workspaceActivationOrder = new OrderedSet<WorkspaceView>();

		private IDesktopWindow _desktopWindow;
		private DesktopWindowForm _desktopWindowForm;

		protected internal DesktopWindowView(IDesktopWindow desktopWindow)
			: this(desktopWindow, new DesktopWindowForm()) {}

		protected DesktopWindowView(IDesktopWindow desktopWindow, DesktopWindowForm desktopWindowForm)
		{
			_desktopWindow = desktopWindow;
			_desktopWindowForm = desktopWindowForm;
			//_desktopWindowForm.VisibleChanged += new EventHandler(FormVisibleChangedEventHandler);
			_desktopWindowForm.Activated += OnDesktopWindowFormActivated;
			_desktopWindowForm.Deactivated += OnDesktopWindowFormDeactivated;
			_desktopWindowForm.Closing += OnDesktopWindowFormClosing;
			_desktopWindowForm.ActiveWorkspaceViewChanged += OnDesktopWindowFormActiveWorkspaceViewChanged;
			//_desktopWindowForm.TabbedGroups.PageCloseRequest += new TabbedGroups.PageCloseRequestHandler(TabbedGroupPageClosePressedEventHandler);
			//_desktopWindowForm.TabbedGroups.PageChanged += new TabbedGroups.PageChangeHandler(TabbedGroupPageChangedEventHandler);
		}

		protected override void Dispose(bool disposing)
		{
			if (disposing)
			{
				if (_desktopWindowForm != null)
				{
					_desktopWindowForm.Activated -= OnDesktopWindowFormActivated;
					_desktopWindowForm.Deactivated -= OnDesktopWindowFormDeactivated;
					_desktopWindowForm.Closing -= OnDesktopWindowFormClosing;
					_desktopWindowForm.ActiveWorkspaceViewChanged -= OnDesktopWindowFormActiveWorkspaceViewChanged;
					_desktopWindowForm = null;
				}

				if (_desktopWindow != null)
				{
					_desktopWindow = null;
				}
			}

			base.Dispose(disposing);
		}

		protected internal Window DesktopWindowForm
		{
			get { return _desktopWindowForm; }
		}

		public ActionModelNode GlobalMenus
		{
			get { return _desktopWindowForm.GlobalMenus; }
			set { _desktopWindowForm.GlobalMenus = value; }
		}

		public ActionModelNode GlobalToolbars
		{
			get { return _desktopWindowForm.GlobalToolbars; }
			set { _desktopWindowForm.GlobalToolbars = value; }
		}

		public override void Open()
		{
			_desktopWindowForm.Show();
		}

		public override void Show()
		{
			_desktopWindowForm.Show();
		}

		public override void Hide()
		{
			_desktopWindowForm.Hide();
		}

		public override void Activate()
		{
			_desktopWindowForm.Activate();
		}

		protected override void OnTitleChanged(EventArgs e)
		{
			base.OnTitleChanged(e);

			var title = Title;
			if (string.IsNullOrEmpty(title))
				title = " ";
			_desktopWindowForm.Title = title;
		}

		#region IDesktopWindowView Members

		public IDialogBoxView CreateDialogBoxView(DialogBox dialog)
		{
			return null;
			throw new NotImplementedException();
		}

		public IShelfView CreateShelfView(Shelf shelf)
		{
			return null;
			throw new NotImplementedException();
		}

		public IWorkspaceView CreateWorkspaceView(Workspace workspace)
		{
			return new WorkspaceView(workspace, this);
		}

		void IDesktopWindowView.SetMenuModel(ActionModelNode model)
		{
			GlobalMenus = model;
		}

		void IDesktopWindowView.SetToolbarModel(ActionModelNode model)
		{
			GlobalToolbars = model;
		}

		public DialogBoxAction ShowMessageBox(string message, string title, MessageBoxActions buttons)
		{
			return MessageBox.Show(message, title, buttons, _desktopWindowForm);
		}

		public FileDialogResult ShowOpenFileDialogBox(FileDialogCreationArgs args)
		{
			return null;
			throw new NotImplementedException();
		}

		public FileDialogResult ShowSaveFileDialogBox(FileDialogCreationArgs args)
		{
			return null;
			throw new NotImplementedException();
		}

		public FileDialogResult ShowSelectFolderDialogBox(SelectFolderDialogCreationArgs args)
		{
			return null;
			throw new NotImplementedException();
		}

		#endregion

		#region Window Events

		private void OnDesktopWindowFormActivated(object sender, EventArgs e)
		{
			// deactivate the previous window before activating the new one
			var lastActiveDesktopWindow = _desktopWindowActivationOrder.LastElement;
			if (lastActiveDesktopWindow != this)
			{
				if (lastActiveDesktopWindow != null)
				{
					lastActiveDesktopWindow.Active = false;
				}

				Active = true;
				_desktopWindowActivationOrder.Add(this);
			}
		}

		private void OnDesktopWindowFormDeactivated(object sender, EventArgs e)
		{
			// this event may be fired when showing a dialog, so it's not really useful
		}

		private void OnDesktopWindowFormClosing(object sender, CancelEventArgs e)
		{
			e.Cancel = true;
			RequestClose();
		}

		private void OnDesktopWindowFormActiveWorkspaceViewChanged(object sender, EventArgs e)
		{
			// deactivate the previous workspace before activating the new one
			var lastActiveWorkspace = _workspaceActivationOrder.LastElement;
			if (lastActiveWorkspace != null)
			{
				lastActiveWorkspace.Active = false;
			}

			// account for the case where the last workspace closes
			var activeWorkspace = _desktopWindowForm.ActiveWorkspaceView;
			if (activeWorkspace != null)
			{
				activeWorkspace.Active = false; // force a change event, if it's initializing the workspace
				activeWorkspace.Active = true;
				_workspaceActivationOrder.Add(activeWorkspace);
			}
		}

		#endregion

		internal void AddWorkspaceView(WorkspaceView workspaceView)
		{
			_desktopWindowForm.AddWorkspaceView(workspaceView);
		}

		internal void RemoveWorkspaceView(WorkspaceView workspaceView)
		{
			_desktopWindowForm.RemoveWorkspaceView(workspaceView);
		}
	}
}