#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.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using CodeImp.DoomBuilder.Actions;
using CodeImp.DoomBuilder.Config;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.GZBuilder.Data;
using CodeImp.DoomBuilder.IO;
using CodeImp.DoomBuilder.Map;
using CodeImp.DoomBuilder.Types;
using CodeImp.DoomBuilder.Windows;
using CodeImp.DoomBuilder.VisualModes;

#endregion

namespace CodeImp.DoomBuilder.Editing
{
	public class CopyPasteManager
	{
		#region ================== Constants
		
		private const string CLIPBOARD_DATA_FORMAT = "GZDOOM_BUILDER_GEOMETRY";
		private const string CLIPBOARD_DATA_FORMAT_DB2 = "DOOM_BUILDER_GEOMETRY";

		#endregion
		
		#region ================== Variables
		
		// Disposing
		private bool isdisposed;
		
		// Last inserted prefab
		private string lastprefabfile;
		
		#endregion
		
		#region ================== Properties
		
		public bool IsDisposed { get { return isdisposed; } }
		public bool IsPreviousPrefabAvailable { get { return (lastprefabfile != null); } }

		#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 ================== Methods
		
		// This makes a prefab of the selection. Returns null when cancelled.
		private static MemoryStream MakePrefab()
		{
			// Let the plugins know
			if(General.Plugins.OnCopyBegin())
			{
				// 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.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();
					
					// Convert flags and activations to UDMF fields, if needed
					if(!(General.Map.FormatInterface is UniversalMapSetIO)) copyset.TranslateToUDMF(General.Map.FormatInterface.GetType());

					// Write data to stream
					MemoryStream memstream = new MemoryStream();
					UniversalStreamWriter writer = new UniversalStreamWriter();
					writer.RememberCustomTypes = false;
					writer.Write(copyset, memstream, null);

					// Compress the stream
					memstream.Seek(0, SeekOrigin.Begin);
					MemoryStream compressed = SharpCompressHelper.CompressStream(memstream);//mxd

					// Done
					memstream.Dispose();
					General.Editing.Mode.OnCopyEnd();
					General.Plugins.OnCopyEnd();
					return compressed;
				}
			}

			// Aborted
			return null;
		}

		// This pastes a prefab. Returns false when paste was cancelled.
		public void InsertPrefabStream(Stream stream, PasteOptions options)
		{
			// Cancel volatile mode
			General.Editing.DisengageVolatileMode();

			// Let the plugins know
			if(General.Plugins.OnPasteBegin(options))
			{
				// Ask the editing mode to prepare selection for pasting.
				if(General.Editing.Mode.OnPasteBegin(options))
				{
					Cursor oldcursor = Cursor.Current;
					Cursor.Current = Cursors.WaitCursor;
					
					if(stream != null)
						PastePrefab(stream, options);
					
					General.MainWindow.UpdateInterface();
					
					Cursor.Current = oldcursor;
				}
			}
		}
		
		// This pastes a prefab. Returns false when paste was cancelled.
		private static void PastePrefab(Stream filedata, PasteOptions options)
		{
			// Create undo
			General.MainWindow.DisplayStatus(StatusType.Action, "Inserted prefab.");
			General.Map.UndoRedo.CreateUndo("Insert prefab");
			
			// Decompress stream
			MemoryStream memstream; //mxd
			
			try 
			{
				memstream = SharpCompressHelper.DecompressStream(filedata); //mxd
				memstream.Seek(0, SeekOrigin.Begin);
			}
			catch(Exception e)
			{
				General.ErrorLogger.Add(ErrorType.Error, e.GetType().Name + " while reading prefab from file: " + e.Message);
				General.WriteLogLine(e.StackTrace);
				General.ShowErrorMessage("Unable to load prefab. See log file for error details.", MessageBoxButtons.OK);
				return;
			}
			
			// Mark all current geometry
			General.Map.Map.ClearAllMarks(true);
			
			// Read data stream
			UniversalStreamReader reader = new UniversalStreamReader(General.Map.FormatInterface.UIFields); //mxd
			reader.StrictChecking = false;
			General.Map.Map.BeginAddRemove();

			//mxd. UniversalStreamReader can now throw errors
			try
			{
				reader.Read(General.Map.Map, memstream);
			}
			catch(Exception e)
			{
				General.ErrorLogger.Add(ErrorType.Error, "Unable to load prefab. " + e.GetType().Name + ": " + e.Message);
				General.ShowErrorMessage("Unable to load prefab." + Environment.NewLine + Environment.NewLine + e.Message, MessageBoxButtons.OK);
				return;
			}
			finally
			{
				General.Map.Map.EndAddRemove();
			}
			
			// The new geometry is not marked, so invert the marks to get it marked
			General.Map.Map.InvertAllMarks();
			
			// Convert UDMF fields back to flags and activations, if needed
			if(!(General.Map.FormatInterface is UniversalMapSetIO)) General.Map.Map.TranslateFromUDMF();

			// Modify tags and actions if preferred
			if(options.ChangeTags == PasteOptions.TAGS_REMOVE) Tools.RemoveMarkedTags();
			if(options.ChangeTags == PasteOptions.TAGS_RENUMBER) Tools.RenumberMarkedTags();
			if(options.RemoveActions) Tools.RemoveMarkedActions();
			
			// Done
			memstream.Dispose();
			General.Map.Map.UpdateConfiguration();
			General.Map.ThingsFilter.Update();
			General.Editing.Mode.OnPasteEnd(options);
			General.Plugins.OnPasteEnd(options);
		}
		
		// This performs the copy. Returns false when copy was cancelled.
		private static bool DoCopySelection(string desc)
		{
			// Check if possible to copy/paste
			if(General.Editing.Mode.Attributes.AllowCopyPaste)
			{
				// Let the plugins know
				if(General.Plugins.OnCopyBegin())
				{
					// 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.Editing.Mode.OnCopyBegin())
					{
						General.MainWindow.DisplayStatus(StatusType.Action, desc);

						// 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();

						// Convert flags and activations to UDMF fields, if needed
						if(!(General.Map.FormatInterface is UniversalMapSetIO)) copyset.TranslateToUDMF(General.Map.FormatInterface.GetType());

						// Write data to stream
						MemoryStream memstream = new MemoryStream();
						ClipboardStreamWriter writer = new ClipboardStreamWriter(); //mxd
						writer.Write(copyset, memstream);

						try
						{
							//mxd. Set on clipboard
							DataObject copydata = new DataObject();
							copydata.SetData(CLIPBOARD_DATA_FORMAT, memstream);
							Clipboard.SetDataObject(copydata, true, 5, 200);
						}
						catch(ExternalException)
						{
							General.Interface.DisplayStatus(StatusType.Warning, "Failed to perform a Clipboard operation...");
							memstream.Dispose();
							return false;
						}

						// Done
						memstream.Dispose();
						General.Editing.Mode.OnCopyEnd();
						General.Plugins.OnCopyEnd();
						return true;
					}
				}
			}
			else
			{
				// Copy not allowed
				General.MessageBeep(MessageBeepType.Warning);
			}
			
			// Aborted
			return false;
		}
		
		// This performs the paste. Returns false when paste was cancelled.
		private static void DoPasteSelection(PasteOptions options)
		{
			// Check if possible to copy/paste
			if(General.Editing.Mode.Attributes.AllowCopyPaste)
			{
				bool havepastedata = Clipboard.ContainsData(CLIPBOARD_DATA_FORMAT); //mxd
				bool havedb2pastedata = Clipboard.ContainsData(CLIPBOARD_DATA_FORMAT_DB2); //mxd
				
				// Anything to paste?
				if(havepastedata || havedb2pastedata)
				{
					// Cancel volatile mode
					General.Editing.DisengageVolatileMode();
					
					// Let the plugins know
					if(General.Plugins.OnPasteBegin(options))
					{
						// Ask the editing mode to prepare selection for pasting.
						if(General.Editing.Mode.OnPasteBegin(options.Copy()))
						{
							// Create undo
							General.MainWindow.DisplayStatus(StatusType.Action, "Pasted selected elements.");
							General.Map.UndoRedo.CreateUndo("Paste");

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

							// Read from clipboard
							if(havepastedata)
							{
								using(Stream memstream = (Stream)Clipboard.GetData(CLIPBOARD_DATA_FORMAT))
								{
									// Rewind before use
									memstream.Seek(0, SeekOrigin.Begin);

									// Read data stream
									ClipboardStreamReader reader = new ClipboardStreamReader(); //mxd
									General.Map.Map.BeginAddRemove();
									bool success = reader.Read(General.Map.Map, memstream);
									General.Map.Map.EndAddRemove();
									if(!success) //mxd
									{
										General.Map.UndoRedo.WithdrawUndo(); // This will also mess with the marks...
										General.Map.Map.ClearAllMarks(true); // So re-mark all current geometry...
									}
								}
							}
							// mxd. DB2/DB64 interop
							else if(havedb2pastedata)
							{
								using(Stream memstream = (Stream)Clipboard.GetData(CLIPBOARD_DATA_FORMAT_DB2))
								{
									// Read data stream
									UniversalStreamReader reader = new UniversalStreamReader(new Dictionary<MapElementType, Dictionary<string, UniversalType>>());
									reader.StrictChecking = false;
									General.Map.Map.BeginAddRemove();
									reader.Read(General.Map.Map, memstream);
									General.Map.Map.EndAddRemove();
								}
							}
							else
							{
								throw new NotImplementedException("Unknown clipboard data format!");
							}
							
							// The new geometry is not marked, so invert the marks to get it marked
							General.Map.Map.InvertAllMarks();

							// Check if anything was pasted
							List<Thing> things = General.Map.Map.GetMarkedThings(true); //mxd
							int totalpasted = things.Count;
							totalpasted += General.Map.Map.GetMarkedVertices(true).Count;
							totalpasted += General.Map.Map.GetMarkedLinedefs(true).Count;
							totalpasted += General.Map.Map.GetMarkedSidedefs(true).Count;
							totalpasted += General.Map.Map.GetMarkedSectors(true).Count;
							
							if(totalpasted > 0)
							{
								// Convert UDMF fields back to flags and activations, if needed
								if(!(General.Map.FormatInterface is UniversalMapSetIO)) General.Map.Map.TranslateFromUDMF();

								// Modify tags and actions if preferred
								if(options.ChangeTags == PasteOptions.TAGS_REMOVE) Tools.RemoveMarkedTags();
								if(options.ChangeTags == PasteOptions.TAGS_RENUMBER) Tools.RenumberMarkedTags();
								if(options.RemoveActions) Tools.RemoveMarkedActions();
								
								foreach(Thing t in things) t.UpdateConfiguration(); //mxd
								General.Map.ThingsFilter.Update();
								General.Editing.Mode.OnPasteEnd(options.Copy());
								General.Plugins.OnPasteEnd(options);
							}
						}
					}
				}
				else
				{
                    // Nothing useful on the clipboard
                    // [ZZ] don't beep if 3D mode is currently engaged. the 3D mode allows you to copy/paste non-geometry stuff.
                    //      note that this is a hack and probably needs to be fixed properly by making it beep elsewhere so that the current active mode can decide this.
                    if (!(General.Editing.Mode is VisualMode))
                    {
                        General.MessageBeep(MessageBeepType.Warning);
                    }
                }
			}
			else
			{
				// Paste not allowed
				General.MessageBeep(MessageBeepType.Warning);
			}
		}
		
		#endregion
		
		#region ================== Actions
		
		// This copies the current selection
		[BeginAction("copyselection")]
		public void CopySelection()
		{
			DoCopySelection("Copied selected elements.");
		}
		
		// This cuts the current selection
		[BeginAction("cutselection")]
		public void CutSelection()
		{
			// Copy selected geometry
			if(DoCopySelection("Cut selected elements."))
			{
				// Get the delete action and check if it's bound
				Actions.Action deleteitem = General.Actions["builder_deleteitem"];
				if(deleteitem.BeginBound)
				{
					// Perform delete action
					deleteitem.Begin();
					deleteitem.End();
				}
				else
				{
					// Action not bound
					General.Interface.DisplayStatus(StatusType.Warning, "Cannot remove that in this mode.");
				}
			}
		}
		
		// This pastes what is on the clipboard and marks the new geometry
		[BeginAction("pasteselectionspecial")]
		public void PasteSelectionSpecial()
		{
			// Check if possible to copy/paste
			if(General.Editing.Mode.Attributes.AllowCopyPaste)
			{
				PasteOptionsForm form = new PasteOptionsForm();
				DialogResult result = form.ShowDialog(General.MainWindow);
				if(result == DialogResult.OK) DoPasteSelection(form.Options);
				form.Dispose();
			}
			else
			{
				// Paste not allowed
				General.MessageBeep(MessageBeepType.Warning);
			}
		}
		
		// This pastes what is on the clipboard and marks the new geometry
		[BeginAction("pasteselection")]
		public void PasteSelection()
		{
			DoPasteSelection(General.Settings.PasteOptions);
		}

		// This creates a new prefab from selection
		[BeginAction("createprefab")]
		public void CreatePrefab()
		{
			// Check if possible to copy/paste
			if(General.Editing.Mode.Attributes.AllowCopyPaste)
			{
				Cursor oldcursor = Cursor.Current;
				Cursor.Current = Cursors.WaitCursor;
				
				MemoryStream data = MakePrefab();
				if(data != null)
				{
					Cursor.Current = oldcursor;
					
					SaveFileDialog savefile = new SaveFileDialog();
					savefile.Filter = "Doom Builder Prefabs (*.dbprefab)|*.dbprefab";
					savefile.Title = "Save Prefab As";
					savefile.AddExtension = true;
					savefile.CheckPathExists = true;
					savefile.OverwritePrompt = true;
					savefile.ValidateNames = true;
					if(savefile.ShowDialog(General.MainWindow) == DialogResult.OK)
					{
						try
						{
							Cursor.Current = Cursors.WaitCursor;
							if(File.Exists(savefile.FileName)) File.Delete(savefile.FileName);
							File.WriteAllBytes(savefile.FileName, data.ToArray());
						}
						catch(Exception e)
						{
							Cursor.Current = oldcursor;
							General.ErrorLogger.Add(ErrorType.Error, e.GetType().Name + " while writing prefab to file: " + e.Message);
							General.WriteLogLine(e.StackTrace);
							General.ShowErrorMessage("Error while writing prefab to file! See log file for error details.", MessageBoxButtons.OK);
						}
					}
					data.Dispose();
				}
				else
				{
					// Can't make a prefab right now
					General.MessageBeep(MessageBeepType.Warning);
				}
				
				// Done
				General.MainWindow.UpdateInterface();
				Cursor.Current = oldcursor;
			}
			else
			{
				// Create prefab not allowed
				General.MessageBeep(MessageBeepType.Warning);
			}
		}
		
		// This pastes a prefab from file
		[BeginAction("insertprefabfile")]
		public void InsertPrefabFile()
		{
			// Check if possible to copy/paste
			if(General.Editing.Mode.Attributes.AllowCopyPaste)
			{
				PasteOptions options = General.Settings.PasteOptions.Copy();

				// Cancel volatile mode
				General.Editing.DisengageVolatileMode();

				// Let the plugins know
				if(General.Plugins.OnPasteBegin(options))
				{
					// Ask the editing mode to prepare selection for pasting.
					if(General.Editing.Mode.OnPasteBegin(options))
					{
						Cursor oldcursor = Cursor.Current;

						OpenFileDialog openfile = new OpenFileDialog();
						openfile.Filter = "Doom Builder Prefabs (*.dbprefab)|*.dbprefab";
						openfile.Title = "Open Prefab";
						openfile.AddExtension = false;
						openfile.CheckFileExists = true;
						openfile.Multiselect = false;
						openfile.ValidateNames = true;
						if(openfile.ShowDialog(General.MainWindow) == DialogResult.OK)
						{
							FileStream stream = null;

							try
							{
								Cursor.Current = Cursors.WaitCursor;
								stream = File.OpenRead(openfile.FileName);
							}
							catch(Exception e)
							{
								Cursor.Current = oldcursor;
								General.ErrorLogger.Add(ErrorType.Error, e.GetType().Name + " while reading prefab from file: " + e.Message);
								General.WriteLogLine(e.StackTrace);
								General.ShowErrorMessage("Error while reading prefab from file! See log file for error details.", MessageBoxButtons.OK);
							}

							if(stream != null)
							{
								PastePrefab(stream, options);
								lastprefabfile = openfile.FileName;
								stream.Dispose();
							}
							General.MainWindow.UpdateInterface();
						}

						Cursor.Current = oldcursor;
					}
				}
			}
			else
			{
				// Insert not allowed
				General.MessageBeep(MessageBeepType.Warning);
			}
		}
		
		// This pastes the previously inserted prefab
		[BeginAction("insertpreviousprefab")]
		public void InsertPreviousPrefab()
		{
			// Check if possible to copy/paste
			if(General.Editing.Mode.Attributes.AllowCopyPaste)
			{
				PasteOptions options = General.Settings.PasteOptions.Copy();

				// Is there a previously inserted prefab?
				if(IsPreviousPrefabAvailable)
				{
					// Does the file still exist?
					if(File.Exists(lastprefabfile))
					{
						// Cancel volatile mode
						General.Editing.DisengageVolatileMode();

						// Let the plugins know
						if(General.Plugins.OnPasteBegin(options))
						{
							// Ask the editing mode to prepare selection for pasting.
							if(General.Editing.Mode.OnPasteBegin(options))
							{
								Cursor oldcursor = Cursor.Current;
								FileStream stream = null;

								try
								{
									Cursor.Current = Cursors.WaitCursor;
									stream = File.OpenRead(lastprefabfile);
								}
								catch(Exception e)
								{
									Cursor.Current = oldcursor;
									General.ErrorLogger.Add(ErrorType.Error, e.GetType().Name + " while reading prefab from file: " + e.Message);
									General.WriteLogLine(e.StackTrace);
									General.ShowErrorMessage("Error while reading prefab from file! See log file for error details.", MessageBoxButtons.OK);
								}

								if(stream != null)
								{
									PastePrefab(stream, options);
									stream.Dispose();
								}
								General.MainWindow.UpdateInterface();
								Cursor.Current = oldcursor;
							}
						}
					}
					else
					{
						General.MessageBeep(MessageBeepType.Warning);
						lastprefabfile = null;
						General.MainWindow.UpdateInterface();
					}
				}
				else
				{
					General.MessageBeep(MessageBeepType.Warning);
				}
			}
			else
			{
				// Insert not allowed
				General.MessageBeep(MessageBeepType.Warning);
			}
		}
		
		#endregion
	}
}