#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * This program 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 General Public License for more details.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Reflection;
using CodeImp.DoomBuilder.Windows;
using CodeImp.DoomBuilder.IO;
using CodeImp.DoomBuilder.Map;
using CodeImp.DoomBuilder.Rendering;
using System.Diagnostics;
using CodeImp.DoomBuilder.Actions;

#endregion

namespace CodeImp.DoomBuilder.Editing
{
	public class CopyPasteManager
	{
		#region ================== Constants
		
		private const string CLIPBOARD_DATA_FORMAT = "DOOM_BUILDER_GEOMETRY";

		#endregion
		
		#region ================== Variables
		
		// Disposing
		private bool isdisposed = false;
		
		#endregion
		
		#region ================== Properties
		
		public bool IsDisposed { get { return isdisposed; } }
		
		#endregion
		
		#region ================== Constructor / Disposer
		
		// Constructor
		internal CopyPasteManager()
		{
			// Initialize
			
			// Bind any methods
			General.Actions.BindMethods(this);
			
			// We have no destructor
			GC.SuppressFinalize(this);
		}

		// Disposer
		internal void Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
				// Unbind any methods
				General.Actions.UnbindMethods(this);
				
				// Done
				isdisposed = true;
			}
		}
		
		#endregion
		
		#region ================== Private Methods
		
		// This performs the copy. Returns false when copy was cancelled.
		private bool DoCopySelection()
		{
			// Let the plugins know
			if(General.Plugins.OnPasteBegin())
			{
				// Ask the editing mode to prepare selection for copying.
				// The edit mode should mark all vertices, lines and sectors
				// that need to be copied.
				if(General.Map.Editing.Mode.OnCopyBegin())
				{
					// Copy the marked geometry
					// This links sidedefs that are not linked to a marked sector to a virtual sector
					MapSet copyset = General.Map.Map.CloneMarked();
					
					// Write data to stream
					MemoryStream memstream = new MemoryStream();
					UniversalStreamWriter writer = new UniversalStreamWriter();
					writer.RememberCustomTypes = false;
					writer.Write(copyset, memstream, null);

					// Set on clipboard
					Clipboard.SetData(CLIPBOARD_DATA_FORMAT, memstream);

					// Done
					memstream.Dispose();
					General.Map.Editing.Mode.OnCopyEnd();
					General.Plugins.OnCopyEnd();
					return true;
				}
			}
			
			// Aborted
			return false;
		}
		
		// This performs the paste. Returns false when paste was cancelled.
		private bool DoPasteSelection()
		{
			// Anything to paste?
			if(Clipboard.ContainsData(CLIPBOARD_DATA_FORMAT))
			{
				// Cancel volatile mode
				General.DisengageVolatileMode();
				
				// Let the plugins know
				if(General.Plugins.OnPasteBegin())
				{
					// Ask the editing mode to prepare selection for pasting.
					if(General.Map.Editing.Mode.OnPasteBegin())
					{
						// Read from clipboard
						Stream memstream = (Stream)Clipboard.GetData(CLIPBOARD_DATA_FORMAT);
						memstream.Seek(0, SeekOrigin.Begin);

						// Mark all current geometry
						General.Map.Map.ClearAllMarks(true);

						// Read data stream
						UniversalStreamReader reader = new UniversalStreamReader();
						reader.StrictChecking = false;
						reader.Read(General.Map.Map, memstream);

						// The new geometry is not marked, so invert the marks to get it marked
						General.Map.Map.InvertAllMarks();

						// Done
						memstream.Dispose();
						General.Map.Editing.Mode.OnPasteEnd();
						General.Plugins.OnPasteEnd();
						return true;
					}
				}
				
				// Aborted
				return false;
			}
			else
			{
				// Nothing usefull on the clipboard
				General.MessageBeep(MessageBeepType.Warning);
				return false;
			}
		}
		
		#endregion
		
		#region ================== Public Methods
		
		// This copies the current selection
		[BeginAction("copyselection")]
		public void CopySelection()
		{
			DoCopySelection();
		}
		
		// This cuts the current selection
		[BeginAction("cutselection")]
		public void CutSelection()
		{
			// Copy selected geometry
			if(DoCopySelection())
			{
				// Get the delete action and check if it's bound
				Action deleteitem = General.Actions["builder_deleteitem"];
				if(deleteitem.BeginBound)
				{
					// Perform delete action
					deleteitem.Begin();
					deleteitem.End();
				}
				else
				{
					// Action not bound
					General.Interface.DisplayWarning("Cannot remove that in this mode.");
				}
			}
		}
		
		// This pastes what is on the clipboard and marks the new geometry
		[BeginAction("pasteselection")]
		public void PasteSelection()
		{
			DoPasteSelection();
		}
		
		#endregion
	}
}