#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 System.Diagnostics;
using CodeImp.DoomBuilder.Windows;
using CodeImp.DoomBuilder.IO;
using CodeImp.DoomBuilder.Map;
using CodeImp.DoomBuilder.Editing;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.Data;
using CodeImp.DoomBuilder.Actions;
using CodeImp.DoomBuilder.Config;
using CodeImp.DoomBuilder.Plugins;
using CodeImp.DoomBuilder.Compilers;
using CodeImp.DoomBuilder.VisualModes;

#endregion

namespace CodeImp.DoomBuilder
{
	public sealed class MapManager
	{
		#region ================== Constants

		// Map header name in temporary file
		internal const string TEMP_MAP_HEADER = "TEMPMAP";
		internal const string BUILD_MAP_HEADER = "MAP01";
		public const string CONFIG_MAP_HEADER = "~MAP";

		// Save modes
		public const int SAVE_NORMAL = 0;
		public const int SAVE_AS = 1;
		public const int SAVE_INTO = 2;
		public const int SAVE_TEST = 3;
		
		#endregion

		#region ================== Variables

		// Status
		private bool changed;
		private bool scriptschanged;
		
		// Map information
		private string filetitle;
		private string filepathname;
		private string temppath;

		// Main objects
		private MapSet map;
		private MapSetIO io;
		private MapOptions options;
		private ConfigurationInfo configinfo;
		private GameConfiguration config;
		private DataManager data;
		private D3DDevice graphics;
		private Renderer2D renderer2d;
		private Renderer3D renderer3d;
		private WAD tempwad;
		private GridSetup grid;
		private UndoManager undoredo;
		private CopyPasteManager copypaste;
		private Launcher launcher;
		private ThingsFilter thingsfilter;
		private ScriptEditorForm scriptwindow;
		private List<CompilerError> errors;
		private VisualCamera visualcamera;
		
		// Disposing
		private bool isdisposed = false;

		#endregion

		#region ================== Properties

		public string FilePathName { get { return filepathname; } }
		public string FileTitle { get { return filetitle; } }
		public string TempPath { get { return temppath; } }
		internal MapOptions Options { get { return options; } }
		public MapSet Map { get { return map; } }
		public DataManager Data { get { return data; } }
		public bool IsChanged { get { return changed | CheckScriptChanged(); } set { changed |= value; } }
		public bool IsDisposed { get { return isdisposed; } }
		internal D3DDevice Graphics { get { return graphics; } }
		public IRenderer2D Renderer2D { get { return renderer2d; } }
		public IRenderer3D Renderer3D { get { return renderer3d; } }
		internal Renderer2D CRenderer2D { get { return renderer2d; } }
		internal Renderer3D CRenderer3D { get { return renderer3d; } }
		public GameConfiguration Config { get { return config; } }
		internal ConfigurationInfo ConfigSettings { get { return configinfo; } }
		public GridSetup Grid { get { return grid; } }
		public UndoManager UndoRedo { get { return undoredo; } }
		internal CopyPasteManager CopyPaste { get { return copypaste; } }
		public IMapSetIO FormatInterface { get { return io; } }
		internal Launcher Launcher { get { return launcher; } }
		public ThingsFilter ThingsFilter { get { return thingsfilter; } }
		internal List<CompilerError> Errors { get { return errors; } }
		internal ScriptEditorForm ScriptEditor { get { return scriptwindow; } }
		public VisualCamera VisualCamera { get { return visualcamera; } set { visualcamera = value; } }
		public bool IsScriptsWindowOpen { get { return (scriptwindow != null) && !scriptwindow.IsDisposed; } }
		
		#endregion

		#region ================== Constructor / Disposer

		// Constructor
		internal MapManager()
		{
			// We have no destructor
			GC.SuppressFinalize(this);

			// Create temporary path
			temppath = General.MakeTempDirname();
			Directory.CreateDirectory(temppath);
			General.WriteLogLine("Temporary directory:  " + temppath);

			// Basic objects
			grid = new GridSetup();
			undoredo = new UndoManager();
			copypaste = new CopyPasteManager();
			launcher = new Launcher(this);
			thingsfilter = new NullThingsFilter();
		}

		// Disposer
		internal bool Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
				// Close script editor
				CloseScriptEditor(false);
				
				// Change to no mode
				General.Editing.ChangeMode((EditMode)null);
				
				// Unbind any methods
				General.Actions.UnbindMethods(this);
				
				// Dispose
				if(grid != null) grid.Dispose();
				if(launcher != null) launcher.Dispose();
				if(copypaste != null) copypaste.Dispose();
				if(undoredo != null) undoredo.Dispose();
				General.WriteLogLine("Unloading data resources...");
				if(data != null) data.Dispose();
				General.WriteLogLine("Closing temporary file...");
				if(tempwad != null) tempwad.Dispose();
				General.WriteLogLine("Unloading map data...");
				if(map != null) map.Dispose();
				General.WriteLogLine("Stopping graphics device...");
				if(renderer2d != null) renderer2d.Dispose();
				if(renderer3d != null) renderer3d.Dispose();
				if(graphics != null) graphics.Dispose();
				visualcamera = null;
				grid = null;
				launcher = null;
				copypaste = null;
				undoredo = null;
				data = null;
				tempwad = null;
				map = null;
				renderer2d = null;
				renderer3d = null;
				graphics = null;
				
				// We may spend some time to clean things up here
				GC.Collect();
				
				// Remove temp file
				General.WriteLogLine("Removing temporary directory...");
				try { Directory.Delete(temppath, true); } catch(Exception e)
				{
					General.WriteLogLine(e.GetType().Name + ": " + e.Message);
					General.WriteLogLine("Failed to remove temporary directory!");
				}
				
				// Done
				isdisposed = true;
				return true;
			}
			else
			{
				// Already closed
				return true;
			}
		}

		#endregion

		#region ================== New / Open
		
		// Initializes for a new map
		internal bool InitializeNewMap(MapOptions options)
		{
			string tempfile;
			
			// Apply settings
			this.filetitle = "unnamed.wad";
			this.filepathname = "";
			this.changed = false;
			this.options = options;

			General.WriteLogLine("Creating new map '" + options.CurrentName + "' with configuration '" + options.ConfigFile + "'");

			// Initiate graphics
			General.WriteLogLine("Initializing graphics device...");
			graphics = new D3DDevice(General.MainWindow.Display);
			if(!graphics.Initialize()) return false;
			
			// Create renderers
			renderer2d = new Renderer2D(graphics);
			renderer3d = new Renderer3D(graphics);
			
			// Load game configuration
			General.WriteLogLine("Loading game configuration...");
			configinfo = General.GetConfigurationInfo(options.ConfigFile);
			config = new GameConfiguration(General.LoadGameConfiguration(options.ConfigFile));
			configinfo.ApplyDefaults(config);
			General.Editing.UpdateCurrentEditModes();
			
			// Create map data
			map = new MapSet();
			
			// Create temp wadfile
			tempfile = General.MakeTempFilename(temppath);
			General.WriteLogLine("Creating temporary file: " + tempfile);
			tempwad = new WAD(tempfile);
			
			// Read the map from temp file
			General.WriteLogLine("Initializing map format interface " + config.FormatInterface + "...");
			io = MapSetIO.Create(config.FormatInterface, tempwad, this);

			// Create required lumps
			General.WriteLogLine("Creating map data structures...");
			tempwad.Insert(TEMP_MAP_HEADER, 0, 0);
			io.Write(map, TEMP_MAP_HEADER, 1);
			CreateRequiredLumps(tempwad, TEMP_MAP_HEADER);
			
			// Load data manager
			General.WriteLogLine("Loading data resources...");
			data = new DataManager();
			data.Load(configinfo.Resources, options.Resources);
			
			// Update structures
			map.UpdateConfiguration();
			map.Update();
			thingsfilter.Update();
			
			// Bind any methods
			General.Actions.BindMethods(this);

			// Set defaults
			this.visualcamera = new VisualCamera();
			General.Editing.ChangeMode("VerticesMode");
			ClassicMode cmode = (General.Editing.Mode as ClassicMode);
			if(cmode != null) cmode.SetZoom(0.5f);
			renderer2d.SetViewMode((ViewMode)General.Settings.DefaultViewMode);

			// Success
			this.changed = false;
			General.WriteLogLine("Map creation done");
			return true;
		}

		// Initializes for an existing map
		internal bool InitializeOpenMap(string filepathname, MapOptions options)
		{
			WAD mapwad;
			string tempfile;
			DataLocation maplocation;
			
			// Apply settings
			this.filetitle = Path.GetFileName(filepathname);
			this.filepathname = filepathname;
			this.changed = false;
			this.options = options;
			
			General.WriteLogLine("Opening map '" + options.CurrentName + "' with configuration '" + options.ConfigFile + "'");

			// Initiate graphics
			General.WriteLogLine("Initializing graphics device...");
			graphics = new D3DDevice(General.MainWindow.Display);
			if(!graphics.Initialize()) return false;

			// Create renderers
			renderer2d = new Renderer2D(graphics);
			renderer3d = new Renderer3D(graphics);

			// Load game configuration
			General.WriteLogLine("Loading game configuration...");
			configinfo = General.GetConfigurationInfo(options.ConfigFile);
			config = new GameConfiguration(General.LoadGameConfiguration(options.ConfigFile));
			configinfo.ApplyDefaults(config);
			General.Editing.UpdateCurrentEditModes();
			
			// Create map data
			map = new MapSet();
			
			// Create temp wadfile
			tempfile = General.MakeTempFilename(temppath);
			General.WriteLogLine("Creating temporary file: " + tempfile);
			tempwad = new WAD(tempfile);
			
			// Now open the map file
			General.WriteLogLine("Opening source file: " + filepathname);
			mapwad = new WAD(filepathname, true);

			// Copy the map lumps to the temp file
			General.WriteLogLine("Copying map lumps to temporary file...");
			CopyLumpsByType(mapwad, options.CurrentName, tempwad, TEMP_MAP_HEADER,
							true, true, true, true);

			// Close the map file
			mapwad.Dispose();
			
			// Read the map from temp file
			General.WriteLogLine("Initializing map format interface " + config.FormatInterface + "...");
			io = MapSetIO.Create(config.FormatInterface, tempwad, this);
			General.WriteLogLine("Reading map data structures from file...");
			try { map = io.Read(map, TEMP_MAP_HEADER); }
			catch(Exception e)
			{
				General.WriteLogLine("ERROR: " + e.GetType().Name + ": " + e.Message);
				General.ShowErrorMessage("Unable to read the map data structures with the specified configuration.", MessageBoxButtons.OK);
				return false;
			}
			
			// Load data manager
			General.WriteLogLine("Loading data resources...");
			data = new DataManager();
			maplocation = new DataLocation(DataLocation.RESOURCE_WAD, filepathname, options.StrictPatches, false);
			data.Load(configinfo.Resources, options.Resources, maplocation);

			// Update structures
			map.UpdateConfiguration();
			map.SnapAllToAccuracy();
			map.Update();
			thingsfilter.Update();
			
			// Bind any methods
			General.Actions.BindMethods(this);

			// Set defaults
			this.visualcamera = new VisualCamera();
			General.Editing.ChangeMode("VerticesMode");
			renderer2d.SetViewMode((ViewMode)General.Settings.DefaultViewMode);

			// Center map in screen
			if(General.Editing.Mode is ClassicMode) (General.Editing.Mode as ClassicMode).CenterInScreen();
			
			// Success
			this.changed = false;
			General.WriteLogLine("Map loading done");
			return true;
		}
		
		#endregion

		#region ================== Save

		// Initializes for an existing map
		internal bool SaveMap(string newfilepathname, int savemode)
		{
			MapSet outputset;
			string nodebuildername, oldstatus, settingsfile;
			WAD targetwad;
			int index;
			bool includenodes = false;
			string origmapname;
			
			General.WriteLogLine("Saving map to file: " + newfilepathname);
			
			// If the scripts window is open, save the scripts first
			if(IsScriptsWindowOpen) scriptwindow.Editor.ImplicitSave();
			
			// Only recompile scripts when the scripts have changed
			// (not when only the map changed)
			if(CheckScriptChanged())
			{
				if(!CompileScriptLumps())
				{
					// Compiler failure
					if(errors.Count > 0)
						General.ShowErrorMessage("Error while compiling scripts: " + errors[0].description, MessageBoxButtons.OK);
					else
						General.ShowErrorMessage("Unknown compiler error while compiling scripts!", MessageBoxButtons.OK);
				}
				else
				{
					if(errors != null)
					{
						if(scriptwindow != null) scriptwindow.Editor.ShowErrors(errors);
						if(errors.Count > 0) General.ShowWarningMessage("The compiler was unable to compile all scripts in your map, due to script errors.", MessageBoxButtons.OK);
					}
				}
			}
			
			// Only write the map and rebuild nodes when the actual map has changed
			// (not when only scripts have changed)
			if(changed)
			{
				// Make a copy of the map data
				outputset = map.Clone();

				// Remove all flags from all 3D Start things
				foreach(Thing t in outputset.Things)
				{
					if(t.Type == config.Start3DModeThingType)
					{
						List<string> flagkeys = new List<string>(t.Flags.Keys);
						foreach(string k in flagkeys) t.Flags[k] = false;
					}
				}

				// Do we need sidedefs compression?
				if(map.Sidedefs.Count > io.MaxSidedefs)
				{
					// Compress sidedefs
					outputset.CompressSidedefs();

					// Check if it still doesnt fit
					if(map.Sidedefs.Count > io.MaxSidedefs)
					{
						// Problem! Can't save the map like this!
						General.ShowErrorMessage("Unable to save the map: There are too many unique sidedefs!", MessageBoxButtons.OK);
						return false;
					}
				}
				
				// TODO: Check for more limitations
				
				// Write to temporary file
				General.WriteLogLine("Writing map data structures to file...");
				index = tempwad.FindLumpIndex(TEMP_MAP_HEADER);
				if(index == -1) index = 0;
				io.Write(outputset, TEMP_MAP_HEADER, index);
				outputset.Dispose();
				
				// Get the corresponding nodebuilder
				nodebuildername = savemode == SAVE_TEST ? configinfo.NodebuilderTest : configinfo.NodebuilderSave;

				// Build the nodes
				oldstatus = General.MainWindow.GetCurrentSatus();
				General.MainWindow.DisplayStatus("Building map nodes...");
				if(!string.IsNullOrEmpty(nodebuildername))
					includenodes = BuildNodes(nodebuildername, true);
				else
					includenodes = false;
				General.MainWindow.DisplayStatus(oldstatus);
			}
			else
			{
				// Check if we have nodebuilder lumps
				includenodes = VerifyNodebuilderLumps(tempwad, TEMP_MAP_HEADER);
			}
			
			// Suspend data resources
			data.Suspend();

			// Determine original map name
			origmapname = (options.PreviousName != "") ? options.PreviousName : options.CurrentName;
			
			try
			{
				// Backup existing file, if any
				if(File.Exists(newfilepathname))
				{
					if(File.Exists(newfilepathname + ".backup3")) File.Delete(newfilepathname + ".backup3");
					if(File.Exists(newfilepathname + ".backup2")) File.Move(newfilepathname + ".backup2", newfilepathname + ".backup3");
					if(File.Exists(newfilepathname + ".backup1")) File.Move(newfilepathname + ".backup1", newfilepathname + ".backup2");
					File.Copy(newfilepathname, newfilepathname + ".backup1");
				}
				
				// Except when saving INTO another file,
				// kill the target file if it is different from source file
				if((savemode != SAVE_INTO) && (newfilepathname != filepathname))
				{
					// Kill target file
					if(File.Exists(newfilepathname)) File.Delete(newfilepathname);

					// Kill .dbs settings file
					settingsfile = newfilepathname.Substring(0, newfilepathname.Length - 4) + ".dbs";
					if(File.Exists(settingsfile)) File.Delete(settingsfile);
				}

				// On Save AS we have to copy the previous file to the new file
				if((savemode == SAVE_AS) && (filepathname != ""))
				{
					// Copy if original file still exists
					if(File.Exists(filepathname)) File.Copy(filepathname, newfilepathname, true);
				}
				
				// If the target file exists, we need to rebuild it
				if(File.Exists(newfilepathname))
				{
					// Move the target file aside
					string origwadfile = newfilepathname + ".temp";
					File.Move(newfilepathname, origwadfile);

					// Open original file
					WAD origwad = new WAD(origwadfile, true);
					
					// Create new target file
					targetwad = new WAD(newfilepathname);

					// Copy all lumps, except the original map
					CopyAllLumpsExceptMap(origwad, targetwad, origmapname);
					
					// Close original file and delete it
					origwad.Dispose();
					File.Delete(origwadfile);
				}
				else
				{
					// Create new target file
					targetwad = new WAD(newfilepathname);
				}
			}
			catch(IOException)
			{
				General.ShowErrorMessage("IO Error while writing target file: " + newfilepathname + ". Please make sure the location is accessible and not in use by another program.", MessageBoxButtons.OK);
				data.Resume();
				General.WriteLogLine("Map saving failed");
				return false;
			}
			catch(UnauthorizedAccessException)
			{
				General.ShowErrorMessage("Error while accessing target file: " + newfilepathname + ". Please make sure the location is accessible and not in use by another program.", MessageBoxButtons.OK);
				data.Resume();
				General.WriteLogLine("Map saving failed");
				return false;
			}
			
			// Copy map lumps to target file
			CopyLumpsByType(tempwad, TEMP_MAP_HEADER, targetwad, origmapname, true, true, includenodes, true);

			// Was the map lump name renamed?
			if((options.PreviousName != options.CurrentName) &&
			   (options.PreviousName != ""))
			{
				General.WriteLogLine("Renaming map lump name from " + options.PreviousName + " to " + options.CurrentName);
				
				// Find the map header in target
				index = targetwad.FindLumpIndex(options.PreviousName);
				if(index > -1)
				{
					// Rename the map lump name
					targetwad.Lumps[index].Rename(options.CurrentName);
					options.PreviousName = "";
				}
				else
				{
					// Houston, we've got a problem!
					General.ShowErrorMessage("Error renaming map lump name: the original map lump could not be found!", MessageBoxButtons.OK);
					options.CurrentName = options.PreviousName;
					options.PreviousName = "";
				}
			}

			// Done with the target file
			targetwad.Dispose();

			// Resume data resources
			data.Resume();
			
			// Not saved for testing purpose?
			if(savemode != SAVE_TEST)
			{
				// Saved in a different file?
				if(newfilepathname != filepathname)
				{
					// Keep new filename
					filepathname = newfilepathname;
					filetitle = Path.GetFileName(filepathname);

					// Reload resources
					ReloadResources();
				}

				try
				{
					// Open or create the map settings
					settingsfile = newfilepathname.Substring(0, newfilepathname.Length - 4) + ".dbs";
					options.WriteConfiguration(settingsfile);
				}
				catch(Exception e)
				{
					// Warning only
					General.WriteLogLine("WARNING: " + e.GetType().Name + ": " + e.Message);
					General.WriteLogLine("WARNING: Could not write the map settings configuration file!");
				}

				// Check for compile errors, if the scripts were compiled above
				if(CheckScriptChanged() && (errors != null) && (errors.Count > 0))
				{
					// Show the errors in the script editor
					ShowScriptEditor();
					scriptwindow.Editor.ShowErrors(errors);
				}
				
				// Changes saved
				changed = false;
				scriptschanged = false;
			}
			
			// Success!
			General.WriteLogLine("Map saving done");
			return true;
		}
		
		#endregion

		#region ================== Nodebuild

		// This builds the nodes in the temproary file with the given configuration name
		private bool BuildNodes(string nodebuildername, bool failaswarning)
		{
			NodebuilderInfo nodebuilder;
			string tempfile1, tempfile2, sourcefile;
			bool lumpscomplete = false;
			WAD buildwad;

			// Find the nodebuilder
			nodebuilder = General.GetNodebuilderByName(nodebuildername);
			if(nodebuilder == null)
			{
				// Problem! Can't find that nodebuilder!
				General.ShowWarningMessage("Unable to build the nodes: The configured nodebuilder cannot be found.\nPlease check your game configuration settings!", MessageBoxButtons.OK);
				return false;
			}
			else
			{
				// Create the compiler interface that will run the nodebuilder
				// This automatically creates a temporary directory for us
				Compiler compiler = nodebuilder.CreateCompiler();
				
				// Make temporary filename
				tempfile1 = General.MakeTempFilename(compiler.Location);

				// Make the temporary WAD file
				General.WriteLogLine("Creating temporary build file: " + tempfile1);
				buildwad = new WAD(tempfile1);

				// Determine source file
				if(filepathname.Length > 0)
					sourcefile = filepathname;
				else
					sourcefile = tempwad.Filename;

				// Copy lumps to buildwad
				General.WriteLogLine("Copying map lumps to temporary build file...");
				CopyLumpsByType(tempwad, TEMP_MAP_HEADER, buildwad, BUILD_MAP_HEADER, true, false, false, true);
				
				// Close buildwad
				buildwad.Dispose();
				
				// Does the nodebuilder require an output file?
				if(nodebuilder.HasSpecialOutputFile)
				{
					// Make a temporary output file for the nodebuilder
					tempfile2 = General.MakeTempFilename(compiler.Location);
					General.WriteLogLine("Temporary output file: " + tempfile2);
				}
				else
				{
					// Output file is same as input file
					tempfile2 = tempfile1;
				}
				
				// Run the nodebuilder
				compiler.Parameters = nodebuilder.Parameters;
				compiler.InputFile = Path.GetFileName(tempfile1);
				compiler.OutputFile = Path.GetFileName(tempfile2);
				compiler.SourceFile = sourcefile;
				compiler.WorkingDirectory = Path.GetDirectoryName(tempfile1);
				if(compiler.Run())
				{
					// Open the output file
					buildwad = new WAD(tempfile2);
					
					// Output lumps complete?
					lumpscomplete = VerifyNodebuilderLumps(buildwad, BUILD_MAP_HEADER);
					if(lumpscomplete)
					{
						// Copy nodebuilder lumps to temp file
						General.WriteLogLine("Copying nodebuilder lumps to temporary file...");
						CopyLumpsByType(buildwad, BUILD_MAP_HEADER, tempwad, TEMP_MAP_HEADER, false, false, true, false);
					}
					else
					{
						// Nodebuilder did not build the lumps!
						if(failaswarning)
							General.ShowWarningMessage("Unable to build the nodes: The nodebuilder failed to build the expected data structures.\nThe map will be saved without the nodes.", MessageBoxButtons.OK);
						else
							General.ShowErrorMessage("Unable to build the nodes: The nodebuilder failed to build the expected data structures.", MessageBoxButtons.OK);
					}
					
					// Done with the build wad
					buildwad.Dispose();
				}
				
				// Clean up
				compiler.Dispose();
				
				// Return result
				return lumpscomplete;
			}
		}

		// This verifies if the nodebuilder lumps exist in a WAD file
		private bool VerifyNodebuilderLumps(WAD wad, string mapheader)
		{
			bool lumpscomplete = false;
			
			// Find the map header in source
			int srcindex = wad.FindLumpIndex(mapheader);
			if(srcindex > -1)
			{
				// Go for all the map lump names
				lumpscomplete = true;
				foreach(DictionaryEntry ml in config.MapLumpNames)
				{
					// Read lump settings from map config
					bool lumpnodebuild = config.ReadSetting("maplumpnames." + ml.Key + ".nodebuild", false);
					bool lumpallowempty = config.ReadSetting("maplumpnames." + ml.Key + ".allowempty", false);

					// Check if this lump should exist
					if(lumpnodebuild && !lumpallowempty)
					{
						// Find the lump in the source
						if(wad.FindLump(ml.Key.ToString(), srcindex, srcindex + config.MapLumpNames.Count + 2) == null)
						{
							// Missing a lump!
							lumpscomplete = false;
							break;
						}
					}
				}
			}

			return lumpscomplete;
		}
		
		#endregion

		#region ================== Lumps

		// This returns a copy of the requested lump stream data
		// This is copied from the temp wad file and returns null when the lump is not found
		internal MemoryStream GetLumpData(string lumpname)
		{
			Lump l = tempwad.FindLump(lumpname);
			if(l != null)
			{
				l.Stream.Seek(0, SeekOrigin.Begin);
				return new MemoryStream(l.Stream.ReadAllBytes());
			}
			else
			{
				return null;
			}
		}

		// This writes a copy of the data to a lump in the temp file
		internal void SetLumpData(string lumpname, MemoryStream data)
		{
			int insertindex = tempwad.Lumps.Count;
			
			// Remove the lump if it already exists
			int li = tempwad.FindLumpIndex(lumpname);
			if(li > -1)
			{
				insertindex = li;
				tempwad.RemoveAt(li);
			}
			
			// Insert new lump
			Lump l = tempwad.Insert(lumpname, insertindex, (int)data.Length);
			l.Stream.Seek(0, SeekOrigin.Begin);
			data.WriteTo(l.Stream);
		}

		// This creates empty lumps for those required
		private void CreateRequiredLumps(WAD target, string mapname)
		{
			int headerindex, insertindex, targetindex;
			string lumpname;
			bool lumprequired;
			
			// Find the map header in target
			headerindex = target.FindLumpIndex(mapname);
			if(headerindex == -1)
			{
				// If this header doesnt exists in the target
				// then insert at the end of the target
				headerindex = target.Lumps.Count;
			}

			// Begin inserting at target header index
			insertindex = headerindex;

			// Go for all the map lump names
			foreach(DictionaryEntry ml in config.MapLumpNames)
			{
				// Read lump settings from map config
				lumprequired = config.ReadSetting("maplumpnames." + ml.Key + ".required", false);

				// Check if this lump is required
				if(lumprequired)
				{
					// Get the lump name
					lumpname = ml.Key.ToString();
					if(lumpname == CONFIG_MAP_HEADER) lumpname = mapname;

					// Check if the lump is missing at the target
					targetindex = FindSpecificLump(target, lumpname, headerindex, mapname, config.MapLumpNames);
					if(targetindex == -1)
					{
						// Determine target index
						insertindex++;
						if(insertindex > target.Lumps.Count) insertindex = target.Lumps.Count;

						// Create new, emtpy lump
						General.WriteLogLine(lumpname + " is required! Created empty lump.");
						target.Insert(lumpname, insertindex, 0);
					}
					else
					{
						// Move insert index
						insertindex = targetindex;
					}
				}
			}
		}
		
		// This copies all lumps, except those of a specific map
		private void CopyAllLumpsExceptMap(WAD source, WAD target, string sourcemapname)
		{
			// Go for all lumps
			bool skipping = false;
			foreach(Lump srclump in source.Lumps)
			{
				// Check if we should stop skipping lumps here
				if(skipping && !config.MapLumpNames.Contains(srclump.Name))
				{
					// Stop skipping
					skipping = false;
				}
				
				// Check if we should start skipping lumps here
				if(!skipping && (srclump.Name == sourcemapname))
				{
					// We have encountered the map header, start skipping!
					skipping = true;
				}

				// Not skipping this lump?
				if(!skipping)
				{
					// Copy lump over!
					Lump tgtlump = target.Insert(srclump.Name, target.Lumps.Count, srclump.Length);
					srclump.CopyTo(tgtlump);
				}
			}
		}
		
		// This copies specific map lumps from one WAD to another
		private void CopyLumpsByType(WAD source, string sourcemapname,
									 WAD target, string targetmapname,
									 bool copyrequired, bool copyblindcopy,
									 bool copynodebuild, bool copyscript)
		{
			bool lumprequired, lumpblindcopy, lumpnodebuild;
			string lumpscript, srclumpname, tgtlumpname;
			int srcheaderindex, tgtheaderindex, targetindex, sourceindex, lumpindex;
			Lump lump, newlump;
			
			// Find the map header in target
			tgtheaderindex = target.FindLumpIndex(targetmapname);
			if(tgtheaderindex == -1)
			{
				// If this header doesnt exists in the target
				// then insert at the end of the target
				tgtheaderindex = target.Lumps.Count;
			}

			// Begin inserting at target header index
			targetindex = tgtheaderindex;
			
			// Find the map header in source
			srcheaderindex = source.FindLumpIndex(sourcemapname);
			if(srcheaderindex > -1)
			{
				// Copy the map header from source to target
				//newlump = target.Insert(targetmapname, tgtindex++, source.Lumps[srcindex].Length);
				//source.Lumps[srcindex].CopyTo(newlump);
				
				// Go for all the map lump names
				foreach(DictionaryEntry ml in config.MapLumpNames)
				{
					// Read lump settings from map config
					lumprequired = config.ReadSetting("maplumpnames." + ml.Key + ".required", false);
					lumpblindcopy = config.ReadSetting("maplumpnames." + ml.Key + ".blindcopy", false);
					lumpnodebuild = config.ReadSetting("maplumpnames." + ml.Key + ".nodebuild", false);
					lumpscript = config.ReadSetting("maplumpnames." + ml.Key + ".script", "");

					// Check if this lump should be copied
					if((lumprequired && copyrequired) || (lumpblindcopy && copyblindcopy) ||
					   (lumpnodebuild && copynodebuild) || ((lumpscript.Length != 0) && copyscript))
					{
						// Get the lump name
						srclumpname = ml.Key.ToString();
						tgtlumpname = ml.Key.ToString();
						if(srclumpname == CONFIG_MAP_HEADER) srclumpname = sourcemapname;
						if(tgtlumpname == CONFIG_MAP_HEADER) tgtlumpname = targetmapname;
						
						// Find the lump in the source
						sourceindex = FindSpecificLump(source, srclumpname, srcheaderindex, sourcemapname, config.MapLumpNames);
						if(sourceindex > -1)
						{
							// Remove lump at target
							lumpindex = RemoveSpecificLump(target, tgtlumpname, tgtheaderindex, targetmapname, config.MapLumpNames);

							// Determine target index
							// When original lump was found and removed then insert at that position
							// otherwise insert after last insertion position
							if(lumpindex > -1) targetindex = lumpindex; else targetindex++;
							if(targetindex > target.Lumps.Count) targetindex = target.Lumps.Count;
							
							// Copy the lump to the target
							//General.WriteLogLine(srclumpname + " copying as " + tgtlumpname);
							lump = source.Lumps[sourceindex];
							newlump = target.Insert(tgtlumpname, targetindex, lump.Length);
							lump.CopyTo(newlump);
						}
						else
						{
							General.WriteLogLine("WARNING: " + ml.Key.ToString() + " should be copied but was not found!");
						}
					}
				}
			}
		}
		
		// This finds a lump within the range of known lump names
		// Returns -1 when the lump cannot be found
		internal static int FindSpecificLump(WAD source, string lumpname, int mapheaderindex, string mapheadername, IDictionary maplumps)
		{
			// Use the configured map lump names to find the specific lump within range,
			// because when an unknown lump is met, this search must stop.

			// Go for all lumps in order to find the specified lump
			for(int i = 0; i < maplumps.Count + 1; i++)
			{
				// Still within bounds?
				if((mapheaderindex + i) < source.Lumps.Count)
				{
					// Check if this is a known lump name
					if(maplumps.Contains(source.Lumps[mapheaderindex + i].Name) ||
					   (maplumps.Contains(CONFIG_MAP_HEADER) && (source.Lumps[mapheaderindex + i].Name == mapheadername)))
					{
						// Is this the lump we are looking for?
						if(source.Lumps[mapheaderindex + i].Name == lumpname)
						{
							// Return this index
							return mapheaderindex + i;
						}
					}
					else
					{
						// Unknown lump hit, abort search
						break;
					}
				}
			}
			
			// Nothing found
			return -1;
		}
		
		// This removes a specific lump and returns the position where the lump was removed
		// Returns -1 when the lump could not be found
		internal static int RemoveSpecificLump(WAD source, string lumpname, int mapheaderindex, string mapheadername, IDictionary maplumps)
		{
			int lumpindex;
			
			// Find the specific lump index
			lumpindex = FindSpecificLump(source, lumpname, mapheaderindex, mapheadername, maplumps);
			if(lumpindex > -1)
			{
				// Remove this lump
				//General.WriteLogLine(lumpname + " removed");
				source.RemoveAt(lumpindex);
			}
			else
			{
				// Lump not found
				//General.WriteLogLine("WARNING: " + lumpname + " should be removed but was not found!");
			}
			
			// Return result
			return lumpindex;
		}
		
		#endregion

		#region ================== Selection Groups
		
		// This adds selection to a group
		private void AddSelectionToGroup(int groupindex)
		{
			General.Interface.SetCursor(Cursors.WaitCursor);
			
			// Make undo
			undoredo.CreateUndo("Assign to group " + groupindex);
			
			// Make selection
			map.AddSelectionToGroup(0x01 << groupindex);
			
			General.Interface.SetCursor(Cursors.Default);
		}
		
		// This selects a group
		private void SelectGroup(int groupindex)
		{
			// Select
			int groupmask = 0x01 << groupindex;
			map.SelectVerticesByGroup(groupmask);
			map.SelectLinedefsByGroup(groupmask);
			map.SelectSectorsByGroup(groupmask);
			map.SelectThingsByGroup(groupmask);
			
			// Redraw to show selection
			General.Interface.RedrawDisplay();
		}
		
		// Select actions
		[BeginAction("selectgroup1")] internal void SelectGroup1() { SelectGroup(0); }
		[BeginAction("selectgroup2")] internal void SelectGroup2() { SelectGroup(1); }
		[BeginAction("selectgroup3")] internal void SelectGroup3() { SelectGroup(2); }
		[BeginAction("selectgroup4")] internal void SelectGroup4() { SelectGroup(3); }
		[BeginAction("selectgroup5")] internal void SelectGroup5() { SelectGroup(4); }
		[BeginAction("selectgroup6")] internal void SelectGroup6() { SelectGroup(5); }
		[BeginAction("selectgroup7")] internal void SelectGroup7() { SelectGroup(6); }
		[BeginAction("selectgroup8")] internal void SelectGroup8() { SelectGroup(7); }
		[BeginAction("selectgroup9")] internal void SelectGroup9() { SelectGroup(8); }
		[BeginAction("selectgroup10")] internal void SelectGroup10() { SelectGroup(9); }
		
		// Assign actions
		[BeginAction("assigngroup1")] internal void AssignGroup1() { AddSelectionToGroup(0); }
		[BeginAction("assigngroup2")] internal void AssignGroup2() { AddSelectionToGroup(1); }
		[BeginAction("assigngroup3")] internal void AssignGroup3() { AddSelectionToGroup(2); }
		[BeginAction("assigngroup4")] internal void AssignGroup4() { AddSelectionToGroup(3); }
		[BeginAction("assigngroup5")] internal void AssignGroup5() { AddSelectionToGroup(4); }
		[BeginAction("assigngroup6")] internal void AssignGroup6() { AddSelectionToGroup(5); }
		[BeginAction("assigngroup7")] internal void AssignGroup7() { AddSelectionToGroup(6); }
		[BeginAction("assigngroup8")] internal void AssignGroup8() { AddSelectionToGroup(7); }
		[BeginAction("assigngroup9")] internal void AssignGroup9() { AddSelectionToGroup(8); }
		[BeginAction("assigngroup10")] internal void AssignGroup10() { AddSelectionToGroup(9); }
		
		#endregion
		
		#region ================== Script Editing
		
		// Show the script editor
		[BeginAction("openscripteditor")]
		internal void ShowScriptEditor()
		{
			Cursor.Current = Cursors.WaitCursor;
			
			if(scriptwindow == null)
			{
				// Load the window
				scriptwindow = new ScriptEditorForm();
			}
			
			// Show the window
			if(General.Settings.ScriptOnTop)
			{
				if(scriptwindow.Visible && (scriptwindow.Owner == null)) scriptwindow.Hide();
				scriptwindow.Show(General.MainWindow);
			}
			else
			{
				if(scriptwindow.Visible && (scriptwindow.Owner != null)) scriptwindow.Hide();
				scriptwindow.Show();
			}
			scriptwindow.Focus();
			Cursor.Current = Cursors.Default;
		}
		
		// This asks the user to save changes in script files
		// Returns false when cancelled by the user
		internal bool AskSaveScriptChanges()
		{
			// Window open?
			if(scriptwindow != null)
			{
				// Ask to save changes
				// This also saves implicitly
				return scriptwindow.AskSaveAll();
			}
			else
			{
				// No problems
				return true;
			}
		}
		
		// Close the script editor
		// Specify true for the closing parameter when
		// the window is already in the closing process
		internal void CloseScriptEditor(bool closing)
		{
			if(scriptwindow != null)
			{
				if(!scriptwindow.IsDisposed)
				{
					// Remember what files were open
					scriptwindow.Editor.WriteOpenFilesToConfiguration();
					
					// Remember if lumps are changed
					scriptschanged |= scriptwindow.Editor.CheckImplicitChanges();
					
					// Close now
					if(!closing) scriptwindow.Close();
				}
				
				// Done
				scriptwindow = null;
			}
		}
		
		// This checks if the scripts are changed
		internal bool CheckScriptChanged()
		{
			if(scriptwindow != null)
			{
				// Check if scripts are changed			
				return scriptschanged || scriptwindow.Editor.CheckImplicitChanges();
			}
			else
			{
				// Check if scripts are changed			
				return scriptschanged;
			}
		}

		// This compiles all lumps that require compiling and stores the results
		// Returns true when our code worked properly (even when the compiler returned errors)
		private bool CompileScriptLumps()
		{
			bool success = true;
			errors = new List<CompilerError>();
			
			// Go for all the map lumps
			foreach(MapLumpInfo lumpinfo in config.MapLumps.Values)
			{
				// Is this a script lump?
				if(lumpinfo.script != null)
				{
					// Compile it now
					success &= CompileLump(lumpinfo.name, false);
				}
			}
			return success;
		}
		
		// This compiles a script lump and returns any errors that may have occurred
		// Returns true when our code worked properly (even when the compiler returned errors)
		internal bool CompileLump(string lumpname, bool clearerrors)
		{
			string inputfile, outputfile, sourcefile;
			Compiler compiler;
			byte[] filedata;
			string reallumpname = lumpname;
			
			// Find the lump
			if(lumpname == CONFIG_MAP_HEADER) reallumpname = TEMP_MAP_HEADER;
			Lump lump = tempwad.FindLump(reallumpname);
			if(lump == null) throw new Exception("No such lump in temporary wad file '" + reallumpname + "'.");
			
			// Determine source file
			if(filepathname.Length > 0)
				sourcefile = filepathname;
			else
				sourcefile = tempwad.Filename;
			
			// New list of errors
			if(clearerrors || (errors == null))
				errors = new List<CompilerError>();
			
			// Determine the script configuration to use
			ScriptConfiguration scriptconfig = config.MapLumps[lumpname].script;
			if(scriptconfig.Compiler != null)
			{
				try
				{
					// Initialize compiler
					compiler = scriptconfig.Compiler.Create();
				}
				catch(Exception e)
				{
					// Fail
					errors.Add(new CompilerError("Unable to initialize compiler. " + e.GetType().Name + ": " + e.Message));
					return false;
				}

				try
				{
					// Write lump data to temp script file in compiler's temp directory
					inputfile = General.MakeTempFilename(compiler.Location, "tmp");
					lump.Stream.Seek(0, SeekOrigin.Begin);
					BinaryReader reader = new BinaryReader(lump.Stream);
					File.WriteAllBytes(inputfile, reader.ReadBytes((int)lump.Stream.Length));
				}
				catch(Exception e)
				{
					// Fail
					compiler.Dispose();
					errors.Add(new CompilerError("Unable to write script to working file. " + e.GetType().Name + ": " + e.Message));
					return false;
				}
				
				// Make random output filename
				outputfile = General.MakeTempFilename(compiler.Location, "tmp");
				
				// Run compiler
				compiler.Parameters = scriptconfig.Parameters;
				compiler.InputFile = Path.GetFileName(inputfile);
				compiler.OutputFile = Path.GetFileName(outputfile);
				compiler.SourceFile = sourcefile;
				compiler.WorkingDirectory = Path.GetDirectoryName(inputfile);
				if(compiler.Run())
				{
					// Process errors
					foreach(CompilerError e in compiler.Errors)
					{
						CompilerError newerror = e;

						// If the error's filename equals our temporary file,
						// use the lump name instead and prefix it with ?
						if(string.Compare(e.filename, inputfile, true) == 0)
							newerror.filename = "?" + reallumpname;

						errors.Add(newerror);
					}

					// No errors?
					if(compiler.Errors.Length == 0)
					{
						// Output file exists?
						if(File.Exists(outputfile))
						{
							// Copy output file data into a lump?
							if((scriptconfig.ResultLump != null) && (scriptconfig.ResultLump.Length > 0))
							{
								// Do that now then
								try
								{
									filedata = File.ReadAllBytes(outputfile);
								}
								catch(Exception e)
								{
									// Fail
									compiler.Dispose();
									errors.Add(new CompilerError("Unable to read compiler output file. " + e.GetType().Name + ": " + e.Message));
									return false;
								}

								// Store data
								MemoryStream stream = new MemoryStream(filedata);
								SetLumpData(scriptconfig.ResultLump, stream);
							}
						}
					}

					// Clean up
					compiler.Dispose();
					if(errors.Count == 0) errors = null;

					// Done
					return true;
				}
				else
				{
					// Fail
					compiler.Dispose();
					errors = null;
					return false;
				}
			}
			else
			{
				// No compiler to run for this script type
				if(errors.Count == 0) errors = null;
				return true;
			}
		}
		
		// This clears all compiler errors
		internal void ClearCompilerErrors()
		{
			errors = null;
		}
		
		#endregion
		
		#region ================== Methods

		// This updates everything after the configuration or settings have been changed
		internal void UpdateConfiguration()
		{
			// Update map
			map.UpdateConfiguration();

			// Update settings
			renderer3d.CreateProjection();
		}
		
		// This changes thing filter
		internal void ChangeThingFilter(ThingsFilter newfilter)
		{
			// We have a special filter for null
			if(newfilter == null) newfilter = new NullThingsFilter();
			
			// Deactivate old filter
			if(thingsfilter != null) thingsfilter.Deactivate();

			// Change
			thingsfilter = newfilter;

			// Activate filter
			thingsfilter.Activate();
			
			// Redraw
			General.MainWindow.RedrawDisplay();
		}
		
		// This sets a new mapset for editing
		internal void ChangeMapSet(MapSet newmap)
		{
			// Let the plugin and editing mode know
			General.Plugins.OnMapSetChangeBegin();
			if(General.Editing.Mode != null) General.Editing.Mode.OnMapSetChangeBegin();
			this.visualcamera.Sector = null;

			// Can't have a selection in an old map set
			map.ClearAllSelected();

			// Apply
			map.Dispose();
			map = newmap;
			map.UpdateConfiguration();
			map.SnapAllToAccuracy();
			map.Update();
			thingsfilter.Update();
			
			// Let the plugin and editing mode know
			General.Plugins.OnMapSetChangeEnd();
			if(General.Editing.Mode != null) General.Editing.Mode.OnMapSetChangeEnd();
		}
		
		// This reloads resources
		[BeginAction("reloadresources")]
		internal void ReloadResources()
		{
			DataLocation maplocation;
			string oldstatus;
			Cursor oldcursor;
			
			// Keep old display info
			oldstatus = General.MainWindow.GetCurrentSatus();
			oldcursor = Cursor.Current;
			
			// Show status
			General.MainWindow.DisplayStatus("Reloading data resources...");
			Cursor.Current = Cursors.WaitCursor;
			
			// Clean up
			data.Dispose();
			data = null;
			config = null;
			configinfo = null;
			GC.Collect();
			GC.WaitForPendingFinalizers();
			
			// Reload game configuration
			General.WriteLogLine("Reloading game configuration...");
			configinfo = General.GetConfigurationInfo(options.ConfigFile);
			config = new GameConfiguration(General.LoadGameConfiguration(options.ConfigFile));
			General.Editing.UpdateCurrentEditModes();
			
			// Reload data resources
			General.WriteLogLine("Reloading data resources...");
			data = new DataManager();
			if(!string.IsNullOrEmpty(filepathname))
			{
				maplocation = new DataLocation(DataLocation.RESOURCE_WAD, filepathname, false, false);
				data.Load(configinfo.Resources, options.Resources, maplocation);
			}
			else
			{
				data.Load(configinfo.Resources, options.Resources);
			}
			
			// Apply new settings to map elements
			map.UpdateConfiguration();

			// Re-link the background image
			grid.LinkBackground();
			
			// Inform all plugins that the resources are reloaded
			General.Plugins.ReloadResources();
			
			// Inform editing mode that the resources are reloaded
			if(General.Editing.Mode != null) General.Editing.Mode.OnReloadResources();
			
			// Reset status
			General.MainWindow.DisplayStatus(oldstatus);
			Cursor.Current = oldcursor;
		}

		// Game Configuration action
		[BeginAction("mapoptions")]
		internal void ShowMapOptions()
		{
			// Cancel volatile mode, if any
			General.DisengageVolatileMode();
			
			// Show map options dialog
			MapOptionsForm optionsform = new MapOptionsForm(options);
			if(optionsform.ShowDialog(General.MainWindow) == DialogResult.OK)
			{
				// Update interface
				General.MainWindow.UpdateInterface();

				// Stop data manager
				data.Dispose();
				
				// Apply new options
				this.options = optionsform.Options;

				// Load new game configuration
				General.WriteLogLine("Loading game configuration...");
				configinfo = General.GetConfigurationInfo(options.ConfigFile);
				config = new GameConfiguration(General.LoadGameConfiguration(options.ConfigFile));
				configinfo.ApplyDefaults(config);
				General.Editing.UpdateCurrentEditModes();
				
				// Setup new map format IO
				General.WriteLogLine("Initializing map format interface " + config.FormatInterface + "...");
				io = MapSetIO.Create(config.FormatInterface, tempwad, this);

				// Create required lumps if they don't exist yet
				CreateRequiredLumps(tempwad, TEMP_MAP_HEADER);

				// Let the plugins know
				General.Plugins.MapReconfigure();
				
				// Update interface
				General.MainWindow.UpdateInterface();
				
				// Reload resources
				ReloadResources();
				
				// Done
				General.MainWindow.DisplayReady();
			}

			// Done
			optionsform.Dispose();
		}

		// This shows the things filters setup
		[BeginAction("thingsfilterssetup")]
		internal void ShowThingsFiltersSetup()
		{
			// Show things filter dialog
			ThingsFiltersForm f = new ThingsFiltersForm();
			f.ShowDialog(General.MainWindow);
			f.Dispose();
		}
		
		// This returns true is the given type matches
		public bool IsType(Type t)
		{
			return io.GetType().Equals(t);
		}

		#endregion
	}
}