#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.Drawing;
using System.Drawing.Imaging;
using System.IO;
using CodeImp.DoomBuilder.IO;
//using ICSharpCode.SharpZipLib.Zip;
//mxd
using SharpCompress.Archive;
using SharpCompress.Common;
using SharpCompress.Reader;

#endregion

namespace CodeImp.DoomBuilder.Data
{
	internal sealed class PK3Reader : PK3StructuredReader
	{
		#region ================== Variables

		private DirectoryFilesList files;
        private IArchive archive;//mxd
        private ArchiveType archiveType; //mxd
        private static Dictionary<string, byte[]> sevenZipEntries; //mxd

		#endregion

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

		// Constructor
		public PK3Reader(DataLocation dl) : base(dl)
		{
            General.WriteLogLine("Opening " + Path.GetExtension(location.location).ToUpper().Replace(".", "") + " resource '" + location.location + "'");

			if(!File.Exists(location.location))
				throw new FileNotFoundException("Could not find the file \"" + location.location + "\"", location.location);

            // Make list of all files
            List<DirectoryFileEntry> fileentries = new List<DirectoryFileEntry>();

            //mxd
            archive = ArchiveFactory.Open(location.location);
            archiveType = archive.Type;

            if (archive.Type == ArchiveType.SevenZip) { //random access of 7z archives works TERRIBLY slow in SharpCompress
                sevenZipEntries = new Dictionary<string, byte[]>();

                IReader reader = archive.ExtractAllEntries();
                while (reader.MoveToNextEntry()) {
                    if (!reader.Entry.IsDirectory) {
                        MemoryStream s = new MemoryStream();
                        reader.WriteEntryTo(s);
                        sevenZipEntries.Add(reader.Entry.FilePath.Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar), s.ToArray());
                        fileentries.Add(new DirectoryFileEntry(reader.Entry.FilePath));
                    }
                }
                archive.Dispose();
                archive = null;

            } else {
                foreach (IEntry entry in archive.Entries) {
                    if (!entry.IsDirectory)
                        fileentries.Add(new DirectoryFileEntry(entry.FilePath));
                }
            }

            // Make files list
            files = new DirectoryFilesList(fileentries);
			
			// Initialize without path (because we use paths relative to the PK3 file)
			Initialize();

			// We have no destructor
			GC.SuppressFinalize(this);
		}

		// Disposer
		public override void Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
                General.WriteLogLine("Closing " + Path.GetExtension(location.location).ToUpper().Replace(".", "") + " resource '" + location.location + "'");
                if(archive != null) archive.Dispose(); //mxd

				// Done
				base.Dispose();
			}
		}

		#endregion

		#region ================== Textures

		// This finds and returns a patch stream
		public override Stream GetPatchData(string pname)
		{
			// Error when suspended
			if(issuspended) throw new Exception("Data reader is suspended");

			// Find in any of the wad files
			// Note the backward order, because the last wad's images have priority
			for(int i = wads.Count - 1; i >= 0; i--)
			{
				Stream data = wads[i].GetPatchData(pname);
				if(data != null) return data;
			}

			// Find in patches directory
			string filename = FindFirstFile(PATCHES_DIR, pname, true);
			if((filename != null) && FileExists(filename))
			{
				return LoadFile(filename);
			}

			// Nothing found
			return null;
		}

		// This finds and returns a textue stream
		public override Stream GetTextureData(string pname)
		{
			// Error when suspended
			if(issuspended) throw new Exception("Data reader is suspended");

			// Find in any of the wad files
			// Note the backward order, because the last wad's images have priority
			for(int i = wads.Count - 1; i >= 0; i--)
			{
				Stream data = wads[i].GetTextureData(pname);
				if(data != null) return data;
			}

			// Find in patches directory
			string filename = FindFirstFile(TEXTURES_DIR, pname, true);
			if((filename != null) && FileExists(filename))
			{
				return LoadFile(filename);
			}

			// Nothing found
			return null;
		}

		// This finds and returns a colormap stream
		public override Stream GetColormapData(string pname)
		{
			// Error when suspended
			if(issuspended) throw new Exception("Data reader is suspended");

			// Find in any of the wad files
			// Note the backward order, because the last wad's images have priority
			for(int i = wads.Count - 1; i >= 0; i--)
			{
				Stream data = wads[i].GetColormapData(pname);
				if(data != null) return data;
			}

			// Find in patches directory
			string filename = FindFirstFile(COLORMAPS_DIR, pname, true);
			if((filename != null) && FileExists(filename))
			{
				return LoadFile(filename);
			}

			// Nothing found
			return null;
		}

		#endregion

		#region ================== Sprites

		// This finds and returns a sprite stream
		public override Stream GetSpriteData(string pname)
		{
			string pfilename = pname.Replace('\\', '^');

			// Error when suspended
			if(issuspended) throw new Exception("Data reader is suspended");

			// Find in any of the wad files
			for(int i = wads.Count - 1; i >= 0; i--)
			{
				Stream sprite = wads[i].GetSpriteData(pname);
				if(sprite != null) return sprite;
			}

			// Find in sprites directory
			string filename = FindFirstFile(SPRITES_DIR, pfilename, true);
			if((filename != null) && FileExists(filename))
			{
				return LoadFile(filename);
			}

			// Nothing found
			return null;
		}

		// This checks if the given sprite exists
		public override bool GetSpriteExists(string pname)
		{
			string pfilename = pname.Replace('\\', '^');

			// Error when suspended
			if(issuspended) throw new Exception("Data reader is suspended");

			// Find in any of the wad files
			for(int i = wads.Count - 1; i >= 0; i--)
			{
				if(wads[i].GetSpriteExists(pname)) return true;
			}

			// Find in sprites directory
			string filename = FindFirstFile(SPRITES_DIR, pfilename, true);
			if((filename != null) && FileExists(filename))
			{
				return true;
			}

			// Nothing found
			return false;
		}

		#endregion
		
		#region ================== Methods

		// Return a short name for this data location
		public override string GetTitle()
		{
			return Path.GetFileName(location.location);
		}

		// This creates an image
		protected override ImageData CreateImage(string name, string filename, int imagetype)
		{
			switch(imagetype)
			{
				case ImageDataFormat.DOOMFLAT:
					return new PK3FileImage(this, name, filename, true);

				case ImageDataFormat.DOOMPICTURE:
					return new PK3FileImage(this, name, filename, false);

				case ImageDataFormat.DOOMCOLORMAP:
					return new ColormapImage(name);
					
				default:
					throw new ArgumentException("Invalid image format specified!");
					return null;
			}
		}

		// This returns true if the specified file exists
		internal override bool FileExists(string filename)
		{
			return files.FileExists(filename);
		}

		// This returns all files in a given directory
		protected override string[] GetAllFiles(string path, bool subfolders)
		{
			return files.GetAllFiles(path, subfolders).ToArray();
		}
		
		// This returns all files in a given directory that have the given title
		protected override string[] GetAllFilesWithTitle(string path, string title, bool subfolders)
		{
			return files.GetAllFilesWithTitle(path, title, subfolders).ToArray();
		}

        //mxd. This returns all files in a given directory which title starts with given title
        protected override string[] GetAllFilesWhichTitleStartsWith(string path, string title) {
            return files.GetAllFilesWhichTitleStartsWith(path, title).ToArray();
        }
		
		// This returns all files in a given directory that match the given extension
		protected override string[] GetFilesWithExt(string path, string extension, bool subfolders)
		{
			return files.GetAllFiles(path, extension, subfolders).ToArray();
		}

		// This finds the first file that has the specific name, regardless of file extension
		protected override string FindFirstFile(string beginswith, bool subfolders)
		{
			return files.GetFirstFile(beginswith, subfolders);
		}

		// This finds the first file that has the specific name, regardless of file extension
		protected override string FindFirstFile(string path, string beginswith, bool subfolders)
		{
			return files.GetFirstFile(path, beginswith, subfolders);
		}

		// This finds the first file that has the specific name
		protected override string FindFirstFileWithExt(string path, string beginswith, bool subfolders)
		{
			string title = Path.GetFileNameWithoutExtension(beginswith);
			string ext = Path.GetExtension(beginswith);
			if(ext.Length > 1) ext = ext.Substring(1); else ext = "";
			return files.GetFirstFile(path, title, subfolders, ext);
		}

		// This loads an entire file in memory and returns the stream
		// NOTE: Callers are responsible for disposing the stream!
        internal override MemoryStream LoadFile(string filename)
		{
            MemoryStream filedata = null;
           
            //mxd
            if (archiveType == ArchiveType.SevenZip) { //this works waaaaaay faster with 7z archive
                if (sevenZipEntries.ContainsKey(filename))
                    filedata = new MemoryStream(sevenZipEntries[filename]);
            } else {
                foreach (var entry in archive.Entries) {
                    if (!entry.IsDirectory) {
                        // Is this the entry we are looking for?
                        string entryname = entry.FilePath.Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar);
                        if (string.Compare(entryname, filename, true) == 0) {
                            filedata = new MemoryStream();
                            entry.WriteTo(filedata);
                            break;
                        }
                    }
                }
            }
			
			// Nothing found?
            if (filedata == null){
				throw new FileNotFoundException("Cannot find the file " + filename + " in archive " + location.location + ".");
			}else{
                filedata.Position = 0; //mxd. rewind before use
                return filedata;
			}
		}

		// This creates a temp file for the speciied file and return the absolute path to the temp file
		// NOTE: Callers are responsible for removing the temp file when done!
		protected override string CreateTempFile(string filename)
		{
			// Just copy the file
			string tempfile = General.MakeTempFilename(General.Map.TempPath, "wad");
			MemoryStream filedata = LoadFile(filename);
			File.WriteAllBytes(tempfile, filedata.ToArray());
			filedata.Dispose();
			return tempfile;
		}

		// Public version to load a file
		internal MemoryStream ExtractFile(string filename)
		{
			return LoadFile(filename);
		}
		
		#endregion
	}
}