using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Xml;

using SabreTools.Library.Data;
using SabreTools.Library.DatItems;
using SabreTools.Library.Tools;

#if MONO
using System.IO;
#else
using Alphaleonis.Win32.Filesystem;

using FileStream = System.IO.FileStream;
using StreamWriter = System.IO.StreamWriter;
#endif
using NaturalSort;

namespace SabreTools.Library.DatFiles
{
	/// <summary>
	/// Represents parsing and writing of a Logiqx-derived DAT
	/// </summary>
	/// TODO: Add XSD validation for all XML DAT types (maybe?)
	/// TODO: Verify that all write for this DatFile type is correct
	internal class Logiqx : DatFile
	{
		// Private instance variables specific to Logiqx DATs
		bool _depreciated;

		/// <summary>
		/// Constructor designed for casting a base DatFile
		/// </summary>
		/// <param name="datFile">Parent DatFile to copy from</param>
		/// <param name="depreciated">True if the output uses "game", false if the output uses "machine"</param>
		public Logiqx(DatFile datFile, bool depreciated)
			: base(datFile, cloneHeader: false)
		{
			_depreciated = depreciated;
		}

		/// <summary>
		/// Parse a Logiqx XML DAT and return all found games and roms within
		/// </summary>
		/// <param name="filename">Name of the file to be parsed</param>
		/// <param name="sysid">System ID for the DAT</param>
		/// <param name="srcid">Source ID for the DAT</param>
		/// <param name="keep">True if full pathnames are to be kept, false otherwise (default)</param>
		/// <param name="clean">True if game names are sanitized, false otherwise (default)</param>
		/// <param name="remUnicode">True if we should remove non-ASCII characters from output, false otherwise (default)</param>
		public override void ParseFile(
			// Standard Dat parsing
			string filename,
			int sysid,
			int srcid,

			// Miscellaneous
			bool keep,
			bool clean,
			bool remUnicode)
		{
			// Prepare all internal variables
			Encoding enc = Utilities.GetEncoding(filename);
			XmlReader xtr = Utilities.GetXmlTextReader(filename);
			List<string> dirs = new List<string>();

			// If we got a null reader, just return
			if (xtr == null)
			{
				return;
			}

			// Otherwise, read the file to the end
			try
			{
				xtr.MoveToContent();
				while (!xtr.EOF)
				{
					// We only want elements
					if (xtr.NodeType != XmlNodeType.Element)
					{
						// If we're ending a dir, remove the last item from the dirs list, if possible
						if (xtr.Name == "dir" && dirs.Count > 0)
						{
							dirs.RemoveAt(dirs.Count - 1);
						}

						xtr.Read();
						continue;
					}

					switch (xtr.Name)
					{
						// The datafile tag can have some attributes
						case "datafile":
							// string build = xtr.GetAttribute("build");
							// string debug = xtr.GetAttribute("debug"); // (yes|no) "no"
							xtr.Read();
							break;
						// We want to process the entire subtree of the header
						case "header":
							ReadHeader(xtr.ReadSubtree(), keep);

							// Skip the header node now that we've processed it
							xtr.Skip();
							break;
						// Unique to RomVault-created DATs
						case "dir":
							Type = "SuperDAT";
							dirs.Add(xtr.GetAttribute("name") ?? "");
							xtr.Read();
							break;
						// We want to process the entire subtree of the game
						case "machine": // New-style Logiqx
						case "game": // Old-style Logiqx
							ReadMachine(xtr.ReadSubtree(), dirs, filename, sysid, srcid, keep, clean, remUnicode);

							// Skip the machine now that we've processed it
							xtr.Skip();
							break;
						default:
							xtr.Read();
							break;
					}
				}
			}
			catch (Exception ex)
			{
				Globals.Logger.Warning("Exception found while parsing '{0}': {1}", filename, ex);

				// For XML errors, just skip the affected node
				xtr?.Read();
			}

			xtr.Dispose();
		}

		/// <summary>
		/// Read header information
		/// </summary>
		/// <param name="reader">XmlReader to use to parse the header</param>
		/// <param name="keep">True if full pathnames are to be kept, false otherwise (default)</param>
		private void ReadHeader(XmlReader reader, bool keep)
		{
			bool superdat = false;

			// If there's no subtree to the header, skip it
			if (reader == null)
			{
				return;
			}

			// Otherwise, add what is possible
			reader.MoveToContent();

			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element || reader.Name == "header")
				{
					reader.Read();
					continue;
				}

				// Get all header items (ONLY OVERWRITE IF THERE'S NO DATA)
				string content = "";
				switch (reader.Name)
				{
					case "name":
						content = reader.ReadElementContentAsString(); ;
						Name = (String.IsNullOrWhiteSpace(Name) ? content : Name);
						superdat = superdat || content.Contains(" - SuperDAT");
						if (keep && superdat)
						{
							Type = (String.IsNullOrWhiteSpace(Type) ? "SuperDAT" : Type);
						}
						break;
					case "description":
						content = reader.ReadElementContentAsString();
						Description = (String.IsNullOrWhiteSpace(Description) ? content : Description);
						break;
					case "rootdir": // This is exclusive to TruRip XML
						content = reader.ReadElementContentAsString();
						RootDir = (String.IsNullOrWhiteSpace(RootDir) ? content : RootDir);
						break;
					case "category":
						content = reader.ReadElementContentAsString();
						Category = (String.IsNullOrWhiteSpace(Category) ? content : Category);
						break;
					case "version":
						content = reader.ReadElementContentAsString();
						Version = (String.IsNullOrWhiteSpace(Version) ? content : Version);
						break;
					case "date":
						content = reader.ReadElementContentAsString();
						Date = (String.IsNullOrWhiteSpace(Date) ? content.Replace(".", "/") : Date);
						break;
					case "author":
						content = reader.ReadElementContentAsString();
						Author = (String.IsNullOrWhiteSpace(Author) ? content : Author);
						break;
					case "email":
						content = reader.ReadElementContentAsString();
						Email = (String.IsNullOrWhiteSpace(Email) ? content : Email);
						break;
					case "homepage":
						content = reader.ReadElementContentAsString();
						Homepage = (String.IsNullOrWhiteSpace(Homepage) ? content : Homepage);
						break;
					case "url":
						content = reader.ReadElementContentAsString();
						Url = (String.IsNullOrWhiteSpace(Url) ? content : Url);
						break;
					case "comment":
						content = reader.ReadElementContentAsString();
						Comment = (String.IsNullOrWhiteSpace(Comment) ? content : Comment);
						break;
					case "type": // This is exclusive to TruRip XML
						content = reader.ReadElementContentAsString();
						Type = (String.IsNullOrWhiteSpace(Type) ? content : Type);
						superdat = superdat || content.Contains("SuperDAT");
						break;
					case "clrmamepro":
						if (String.IsNullOrWhiteSpace(Header))
						{
							Header = reader.GetAttribute("header");
						}
						if (ForceMerging == ForceMerging.None)
						{
							ForceMerging = Utilities.GetForceMerging(reader.GetAttribute("forcemerging"));
						}
						if (ForceNodump == ForceNodump.None)
						{
							ForceNodump = Utilities.GetForceNodump(reader.GetAttribute("forcenodump"));
						}
						if (ForcePacking == ForcePacking.None)
						{
							ForcePacking = Utilities.GetForcePacking(reader.GetAttribute("forcepacking"));
						}
						reader.Read();
						break;
					case "romcenter":
						if (reader.GetAttribute("plugin") != null)
						{
							// CDATA
						}
						if (reader.GetAttribute("rommode") != null)
						{
							// (merged|split|unmerged) "split"
						}
						if (reader.GetAttribute("biosmode") != null)
						{
							// merged|split|unmerged) "split"
						}
						if (reader.GetAttribute("samplemode") != null)
						{
							// (merged|unmerged) "merged"
						}
						if (reader.GetAttribute("lockrommode") != null)
						{
							// (yes|no) "no"
						}
						if (reader.GetAttribute("lockbiosmode") != null)
						{
							// (yes|no) "no"
						}
						if (reader.GetAttribute("locksamplemode") != null)
						{
							// (yes|no) "no"
						}
						reader.Read();
						break;
					default:
						reader.Read();
						break;
				}
			}
		}

		/// <summary>
		/// Read game/machine information
		/// </summary>
		/// <param name="reader">XmlReader to use to parse the machine</param>
		/// <param name="dirs">List of dirs to prepend to the game name</param>
		/// <param name="filename">Name of the file to be parsed</param>
		/// <param name="sysid">System ID for the DAT</param>
		/// <param name="srcid">Source ID for the DAT</param>
		/// <param name="keep">True if full pathnames are to be kept, false otherwise (default)</param>
		/// <param name="clean">True if game names are sanitized, false otherwise (default)</param>
		/// <param name="remUnicode">True if we should remove non-ASCII characters from output, false otherwise (default)</param>
		private void ReadMachine(
			XmlReader reader,
			List<string> dirs,

			// Standard Dat parsing
			string filename,
			int sysid,
			int srcid,

			// Miscellaneous
			bool keep,
			bool clean,
			bool remUnicode)
		{
			// If we have an empty machine, skip it
			if (reader == null)
			{
				return;
			}

			// Otherwise, add what is possible
			reader.MoveToContent();

			string key = "";
			string temptype = reader.Name;
			bool containsItems = false;

			// Create a new machine
			MachineType machineType = MachineType.NULL;
			if (Utilities.GetYesNo(reader.GetAttribute("isbios")) == true)
			{
				machineType |= MachineType.Bios;
			}
			if (Utilities.GetYesNo(reader.GetAttribute("isdevice")) == true) // Listxml-specific, used by older DATs
			{
				machineType |= MachineType.Device;
			}
			if (Utilities.GetYesNo(reader.GetAttribute("ismechanical")) == true) // Listxml-specific, used by older DATs
			{
				machineType |= MachineType.Mechanical;
			}

			string dirsString = (dirs != null && dirs.Count() > 0 ? string.Join("/", dirs) + "/" : "");
			Machine machine = new Machine
			{
				Name = dirsString + reader.GetAttribute("name"),
				Description = dirsString + reader.GetAttribute("name"),
				SourceFile = reader.GetAttribute("sourcefile"),
				Board = reader.GetAttribute("board"),
				RebuildTo = reader.GetAttribute("rebuildto"),
				Runnable = Utilities.GetYesNo(reader.GetAttribute("runnable")), // Listxml-specific, used by older DATs

				Comment = "",

				CloneOf = reader.GetAttribute("cloneof") ?? "",
				RomOf = reader.GetAttribute("romof") ?? "",
				SampleOf = reader.GetAttribute("sampleof") ?? "",

				MachineType = (machineType == MachineType.NULL ? MachineType.None : machineType),
			};

			if (Type == "SuperDAT" && !keep)
			{
				string tempout = Regex.Match(machine.Name, @".*?\\(.*)").Groups[1].Value;
				if (!String.IsNullOrWhiteSpace(tempout))
				{
					machine.Name = tempout;
				}
			}

			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get the roms from the machine
				switch (reader.Name)
				{
					case "comment": // There can be multiple comments by spec
						machine.Comment += reader.ReadElementContentAsString();
						break;
					case "description":
						machine.Description = reader.ReadElementContentAsString();
						break;
					case "year":
						machine.Year = reader.ReadElementContentAsString();
						break;
					case "manufacturer":
						machine.Manufacturer = reader.ReadElementContentAsString();
						break;
					case "trurip": // This is special metadata unique to TruRip
						ReadTruRip(reader.ReadSubtree(), machine);

						// Skip the trurip node now that we've processed it
						reader.Skip();
						break;
					case "release":
						containsItems = true;

						DatItem release = new Release
						{
							Name = reader.GetAttribute("name"),
							Region = reader.GetAttribute("region"),
							Language = reader.GetAttribute("language"),
							Date = reader.GetAttribute("date"),
							Default = Utilities.GetYesNo(reader.GetAttribute("default")),
						};

						release.CopyMachineInformation(machine);

						// Now process and add the rom
						key = ParseAddHelper(release, clean, remUnicode);

						reader.Read();
						break;
					case "biosset":
						containsItems = true;

						DatItem biosset = new BiosSet
						{
							Name = reader.GetAttribute("name"),
							Description = reader.GetAttribute("description"),
							Default = Utilities.GetYesNo(reader.GetAttribute("default")),

							SystemID = sysid,
							System = filename,
							SourceID = srcid,
						};

						biosset.CopyMachineInformation(machine);

						// Now process and add the rom
						key = ParseAddHelper(biosset, clean, remUnicode);

						reader.Read();
						break;
					case "rom":
						containsItems = true;

						DatItem rom = new Rom
						{
							Name = reader.GetAttribute("name"),
							Size = Utilities.GetSize(reader.GetAttribute("size")),
							CRC = reader.GetAttribute("crc")?.ToLowerInvariant(),
							MD5 = reader.GetAttribute("md5")?.ToLowerInvariant(),
							SHA1 = reader.GetAttribute("sha1")?.ToLowerInvariant(),
							SHA256 = reader.GetAttribute("sha256")?.ToLowerInvariant(),
							SHA384 = reader.GetAttribute("sha384")?.ToLowerInvariant(),
							SHA512 = reader.GetAttribute("sha512")?.ToLowerInvariant(),
							MergeTag = reader.GetAttribute("merge"),
							ItemStatus = Utilities.GetItemStatus(reader.GetAttribute("status")),
							Date = Utilities.GetDate(reader.GetAttribute("date")),

							SystemID = sysid,
							System = filename,
							SourceID = srcid,
						};

						rom.CopyMachineInformation(machine);

						// Now process and add the rom
						key = ParseAddHelper(rom, clean, remUnicode);

						reader.Read();
						break;
					case "disk":
						containsItems = true;

						DatItem disk = new Disk
						{
							Name = reader.GetAttribute("name"),
							MD5 = reader.GetAttribute("md5")?.ToLowerInvariant(),
							SHA1 = reader.GetAttribute("sha1")?.ToLowerInvariant(),
							SHA256 = reader.GetAttribute("sha256")?.ToLowerInvariant(),
							SHA384 = reader.GetAttribute("sha384")?.ToLowerInvariant(),
							SHA512 = reader.GetAttribute("sha512")?.ToLowerInvariant(),
							MergeTag = reader.GetAttribute("merge"),
							ItemStatus = Utilities.GetItemStatus(reader.GetAttribute("status")),

							SystemID = sysid,
							System = filename,
							SourceID = srcid,
						};

						disk.CopyMachineInformation(machine);

						// Now process and add the rom
						key = ParseAddHelper(disk, clean, remUnicode);

						reader.Read();
						break;
					case "sample":
						containsItems = true;

						DatItem samplerom = new Sample
						{
							Name = reader.GetAttribute("name"),

							SystemID = sysid,
							System = filename,
							SourceID = srcid,
						};

						samplerom.CopyMachineInformation(machine);

						// Now process and add the rom
						key = ParseAddHelper(samplerom, clean, remUnicode);

						reader.Read();
						break;
					case "archive":
						containsItems = true;

						DatItem archiverom = new Archive
						{
							Name = reader.GetAttribute("name"),

							SystemID = sysid,
							System = filename,
							SourceID = srcid,
						};

						archiverom.CopyMachineInformation(machine);

						// Now process and add the rom
						key = ParseAddHelper(archiverom, clean, remUnicode);

						reader.Read();
						break;
					default:
						reader.Read();
						break;
				}
			}

			// If no items were found for this machine, add a Blank placeholder
			if (!containsItems)
			{
				Blank blank = new Blank()
				{
					SystemID = sysid,
					System = filename,
					SourceID = srcid,
				};

				blank.CopyMachineInformation(machine);

				// Now process and add the rom
				key = ParseAddHelper(blank, clean, remUnicode);
			}
		}

		/// <summary>
		/// Read TruRip information
		/// </summary>
		/// <param name="keep">True if full pathnames are to be kept, false otherwise (default)</param>
		/// <param name="machine">Machine information to pass to contained items</param>
		private void ReadTruRip(XmlReader reader, Machine machine)
		{
			// If we have an empty trurip, skip it
			if (reader == null)
			{
				return;
			}

			// Otherwise, add what is possible
			reader.MoveToContent();

			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get the information from the trurip
				string content = "";
				switch (reader.Name)
				{
					case "titleid":
						content = reader.ReadElementContentAsString();
						// string titleid = content;
						break;
					case "publisher":
						machine.Publisher = reader.ReadElementContentAsString();
						break;
					case "developer": // Manufacturer is as close as this gets
						machine.Manufacturer = reader.ReadElementContentAsString();
						break;
					case "year":
						machine.Year = reader.ReadElementContentAsString();
						break;
					case "genre":
						content = reader.ReadElementContentAsString();
						// string genre = content;
						break;
					case "subgenre":
						content = reader.ReadElementContentAsString();
						// string subgenre = content;
						break;
					case "ratings":
						content = reader.ReadElementContentAsString();
						// string ratings = content;
						break;
					case "score":
						content = reader.ReadElementContentAsString();
						// string score = content;
						break;
					case "players":
						content = reader.ReadElementContentAsString();
						// string players = content;
						break;
					case "enabled":
						content = reader.ReadElementContentAsString();
						// string enabled = content;
						break;
					case "crc":
						content = reader.ReadElementContentAsString();
						// string crc = Utilities.GetYesNo(content);
						break;
					case "source":
						machine.SourceFile = reader.ReadElementContentAsString();
						break;
					case "cloneof":
						machine.CloneOf = reader.ReadElementContentAsString();
						break;
					case "relatedto":
						content = reader.ReadElementContentAsString();
						// string relatedto = content;
						break;
					default:
						reader.Read();
						break;
				}
			}
		}

		/// <summary>
		/// Create and open an output file for writing direct from a dictionary
		/// </summary>
		/// <param name="outfile">Name of the file to write to</param>
		/// <param name="ignoreblanks">True if blank roms should be skipped on output, false otherwise (default)</param>
		/// <returns>True if the DAT was written correctly, false otherwise</returns>
		public override bool WriteToFile(string outfile, bool ignoreblanks = false)
		{
			try
			{
				Globals.Logger.User("Opening file for writing: {0}", outfile);
				FileStream fs = Utilities.TryCreate(outfile);

				// If we get back null for some reason, just log and return
				if (fs == null)
				{
					Globals.Logger.Warning("File '{0}' could not be created for writing! Please check to see if the file is writable", outfile);
					return false;
				}

				StreamWriter sw = new StreamWriter(fs, new UTF8Encoding(false));

				// Write out the header
				WriteHeader(sw);

				// Write out each of the machines and roms
				string lastgame = null;

				// Get a properly sorted set of keys
				List<string> keys = Keys;
				keys.Sort(new NaturalComparer());

				foreach (string key in keys)
				{
					List<DatItem> roms = this[key];

					// Resolve the names in the block
					roms = DatItem.ResolveNames(roms);

					for (int index = 0; index < roms.Count; index++)
					{
						DatItem rom = roms[index];

						// There are apparently times when a null rom can skip by, skip them
						if (rom.Name == null || rom.MachineName == null)
						{
							Globals.Logger.Warning("Null rom found!");
							continue;
						}

						// If we have a different game and we're not at the start of the list, output the end of last item
						if (lastgame != null && lastgame.ToLowerInvariant() != rom.MachineName.ToLowerInvariant())
						{
							WriteEndGame(sw);
						}

						// If we have a new game, output the beginning of the new item
						if (lastgame == null || lastgame.ToLowerInvariant() != rom.MachineName.ToLowerInvariant())
						{
							WriteStartGame(sw, rom);
						}

						// If we have a "null" game (created by DATFromDir or something similar), log it to file
						if (rom.Type == ItemType.Rom
							&& ((Rom)rom).Size == -1
							&& ((Rom)rom).CRC == "null")
						{
							Globals.Logger.Verbose("Empty folder found: {0}", rom.MachineName);

							rom.Name = (rom.Name == "null" ? "-" : rom.Name);
							((Rom)rom).Size = Constants.SizeZero;
							((Rom)rom).CRC = ((Rom)rom).CRC == "null" ? Constants.CRCZero : null;
							((Rom)rom).MD5 = ((Rom)rom).MD5 == "null" ? Constants.MD5Zero : null;
							((Rom)rom).SHA1 = ((Rom)rom).SHA1 == "null" ? Constants.SHA1Zero : null;
							((Rom)rom).SHA256 = ((Rom)rom).SHA256 == "null" ? Constants.SHA256Zero : null;
							((Rom)rom).SHA384 = ((Rom)rom).SHA384 == "null" ? Constants.SHA384Zero : null;
							((Rom)rom).SHA512 = ((Rom)rom).SHA512 == "null" ? Constants.SHA512Zero : null;
						}

						// Now, output the rom data
						WriteDatItem(sw, rom, ignoreblanks);

						// Set the new data to compare against
						lastgame = rom.MachineName;
					}
				}

				// Write the file footer out
				WriteFooter(sw);

				Globals.Logger.Verbose("File written!" + Environment.NewLine);
				sw.Dispose();
				fs.Dispose();
			}
			catch (Exception ex)
			{
				Globals.Logger.Error(ex.ToString());
				return false;
			}

			return true;
		}

		/// <summary>
		/// Write out DAT header using the supplied StreamWriter
		/// </summary>
		/// <param name="sw">StreamWriter to output to</param>
		/// <returns>True if the data was written, false on error</returns>
		private bool WriteHeader(StreamWriter sw)
		{
			try
			{
				string header = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
							"<!DOCTYPE datafile PUBLIC \"-//Logiqx//DTD ROM Management Datafile//EN\" \"http://www.logiqx.com/Dats/datafile.dtd\">\n\n" +
							"<datafile>\n" +
							"\t<header>\n" +
							"\t\t<name>" + HttpUtility.HtmlEncode(Name) + "</name>\n" +
							"\t\t<description>" + HttpUtility.HtmlEncode(Description) + "</description>\n" +
							(!String.IsNullOrWhiteSpace(RootDir) ? "\t\t<rootdir>" + HttpUtility.HtmlEncode(RootDir) + "</rootdir>\n" : "") +
							(!String.IsNullOrWhiteSpace(Category) ? "\t\t<category>" + HttpUtility.HtmlEncode(Category) + "</category>\n" : "") +
							"\t\t<version>" + HttpUtility.HtmlEncode(Version) + "</version>\n" +
							(!String.IsNullOrWhiteSpace(Date) ? "\t\t<date>" + HttpUtility.HtmlEncode(Date) + "</date>\n" : "") +
							"\t\t<author>" + HttpUtility.HtmlEncode(Author) + "</author>\n" +
							(!String.IsNullOrWhiteSpace(Email) ? "\t\t<email>" + HttpUtility.HtmlEncode(Email) + "</email>\n" : "") +
							(!String.IsNullOrWhiteSpace(Homepage) ? "\t\t<homepage>" + HttpUtility.HtmlEncode(Homepage) + "</homepage>\n" : "") +
							(!String.IsNullOrWhiteSpace(Url) ? "\t\t<url>" + HttpUtility.HtmlEncode(Url) + "</url>\n" : "") +
							(!String.IsNullOrWhiteSpace(Comment) ? "\t\t<comment>" + HttpUtility.HtmlEncode(Comment) + "</comment>\n" : "") +
							(!String.IsNullOrWhiteSpace(Type) ? "\t\t<type>" + HttpUtility.HtmlEncode(Type) + "</type>\n" : "") +
							(ForcePacking != ForcePacking.None || ForceMerging != ForceMerging.None || ForceNodump != ForceNodump.None || !String.IsNullOrWhiteSpace(Header) ?
								"\t\t<clrmamepro" +
									(ForcePacking == ForcePacking.Unzip ? " forcepacking=\"unzip\"" : "") +
									(ForcePacking == ForcePacking.Zip ? " forcepacking=\"zip\"" : "") +
									(ForceMerging == ForceMerging.Full ? " forcemerging=\"full\"" : "") +
									(ForceMerging == ForceMerging.Split ? " forcemerging=\"split\"" : "") +
									(ForceMerging == ForceMerging.Merged ? " forcemerging=\"merged\"" : "") +
									(ForceMerging == ForceMerging.NonMerged ? " forcemerging=\"nonmerged\"" : "") +
									(ForceNodump == ForceNodump.Ignore ? " forcenodump=\"ignore\"" : "") +
									(ForceNodump == ForceNodump.Obsolete ? " forcenodump=\"obsolete\"" : "") +
									(ForceNodump == ForceNodump.Required ? " forcenodump=\"required\"" : "") +
									(!String.IsNullOrWhiteSpace(Header) ? " header=\"" + Header + "\"" : "") +
									" />\n"
							: "") +
							"\t</header>\n";

				// Write the header out
				sw.Write(header);
				sw.Flush();
			}
			catch (Exception ex)
			{
				Globals.Logger.Error(ex.ToString());
				return false;
			}

			return true;
		}

		/// <summary>
		/// Write out Game start using the supplied StreamWriter
		/// </summary>
		/// <param name="sw">StreamWriter to output to</param>
		/// <param name="rom">DatItem object to be output</param>
		/// <returns>True if the data was written, false on error</returns>
		private bool WriteStartGame(StreamWriter sw, DatItem rom)
		{
			try
			{
				// No game should start with a path separator
				if (rom.MachineName.StartsWith(Path.DirectorySeparatorChar.ToString()))
				{
					rom.MachineName = rom.MachineName.Substring(1);
				}

				string state = "\t<" + (_depreciated ? "game" : "machine") + " name=\"" + HttpUtility.HtmlEncode(rom.MachineName) + "\"" +
								(ExcludeOf ? "" :
									((rom.MachineType & MachineType.Bios) != 0 ? " isbios=\"yes\"" : "") +
									((rom.MachineType & MachineType.Device) != 0 ? " isdevice=\"yes\"" : "") +
									((rom.MachineType & MachineType.Mechanical) != 0 ? " ismechanical=\"yes\"" : "") +
									(rom.Runnable == true ? " runnable=\"yes\"" : "") +
									(String.IsNullOrWhiteSpace(rom.CloneOf) || (rom.MachineName.ToLowerInvariant() == rom.CloneOf.ToLowerInvariant())
										? ""
										: " cloneof=\"" + HttpUtility.HtmlEncode(rom.CloneOf) + "\"") +
									(String.IsNullOrWhiteSpace(rom.RomOf) || (rom.MachineName.ToLowerInvariant() == rom.RomOf.ToLowerInvariant())
										? ""
										: " romof=\"" + HttpUtility.HtmlEncode(rom.RomOf) + "\"") +
									(String.IsNullOrWhiteSpace(rom.SampleOf) || (rom.MachineName.ToLowerInvariant() == rom.SampleOf.ToLowerInvariant())
										? ""
										: " sampleof=\"" + HttpUtility.HtmlEncode(rom.SampleOf) + "\"")
								) +
								">\n" +
							(String.IsNullOrWhiteSpace(rom.Comment) ? "" : "\t\t<comment>" + HttpUtility.HtmlEncode(rom.Comment) + "</comment>\n") +
							"\t\t<description>" + HttpUtility.HtmlEncode((String.IsNullOrWhiteSpace(rom.MachineDescription) ? rom.MachineName : rom.MachineDescription)) + "</description>\n" +
							(String.IsNullOrWhiteSpace(rom.Year) ? "" : "\t\t<year>" + HttpUtility.HtmlEncode(rom.Year) + "</year>\n") +
							(String.IsNullOrWhiteSpace(rom.Manufacturer) ? "" : "\t\t<manufacturer>" + HttpUtility.HtmlEncode(rom.Manufacturer) + "</manufacturer>\n");

				sw.Write(state);
				sw.Flush();
			}
			catch (Exception ex)
			{
				Globals.Logger.Error(ex.ToString());
				return false;
			}

			return true;
		}

		/// <summary>
		/// Write out Game end using the supplied StreamWriter
		/// </summary>
		/// <param name="sw">StreamWriter to output to</param>
		/// <returns>True if the data was written, false on error</returns>
		private bool WriteEndGame(StreamWriter sw)
		{
			try
			{
				string state = "\t</" + (_depreciated ? "game" : "machine") + ">\n";

				sw.Write(state);
				sw.Flush();
			}
			catch (Exception ex)
			{
				Globals.Logger.Error(ex.ToString());
				return false;
			}

			return true;
		}

		/// <summary>
		/// Write out DatItem using the supplied StreamWriter
		/// </summary>
		/// <param name="sw">StreamWriter to output to</param>
		/// <param name="rom">DatItem object to be output</param>
		/// <param name="ignoreblanks">True if blank roms should be skipped on output, false otherwise (default)</param>
		/// <returns>True if the data was written, false on error</returns>
		private bool WriteDatItem(StreamWriter sw, DatItem rom, bool ignoreblanks = false)
		{
			// If we are in ignore blanks mode AND we have a blank (0-size) rom, skip
			if (ignoreblanks
				&& (rom.Type == ItemType.Rom
				&& (((Rom)rom).Size == 0 || ((Rom)rom).Size == -1)))
			{
				return true;
			}

			try
			{
				string state = "";
				switch (rom.Type)
				{
					case ItemType.Archive:
						state += "\t\t<archive name=\"" + HttpUtility.HtmlEncode(rom.Name) + "\""
							+ "/>\n";
						break;
					case ItemType.BiosSet:
						state += "\t\t<biosset name=\"" + HttpUtility.HtmlEncode(rom.Name) + "\""
							+ (!String.IsNullOrWhiteSpace(((BiosSet)rom).Description) ? " description=\"" + HttpUtility.HtmlEncode(((BiosSet)rom).Description) + "\"" : "")
							+ (((BiosSet)rom).Default != null
								? ((BiosSet)rom).Default.ToString().ToLowerInvariant()
								: "")
							+ "/>\n";
						break;
					case ItemType.Disk:
						state += "\t\t<disk name=\"" + HttpUtility.HtmlEncode(rom.Name) + "\""
							+ (!String.IsNullOrWhiteSpace(((Disk)rom).MD5) ? " md5=\"" + ((Disk)rom).MD5.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Disk)rom).SHA1) ? " sha1=\"" + ((Disk)rom).SHA1.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Disk)rom).SHA256) ? " sha256=\"" + ((Disk)rom).SHA256.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Disk)rom).SHA384) ? " sha384=\"" + ((Disk)rom).SHA384.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Disk)rom).SHA512) ? " sha512=\"" + ((Disk)rom).SHA512.ToLowerInvariant() + "\"" : "")
							+ (((Disk)rom).ItemStatus != ItemStatus.None ? " status=\"" + ((Disk)rom).ItemStatus.ToString().ToLowerInvariant() + "\"" : "")
							+ "/>\n";
						break;
					case ItemType.Release:
						state += "\t\t<release name=\"" + HttpUtility.HtmlEncode(rom.Name) + "\""
							+ (!String.IsNullOrWhiteSpace(((Release)rom).Region) ? " region=\"" + HttpUtility.HtmlEncode(((Release)rom).Region) + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Release)rom).Language) ? " language=\"" + HttpUtility.HtmlEncode(((Release)rom).Language) + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Release)rom).Date) ? " date=\"" + HttpUtility.HtmlEncode(((Release)rom).Date) + "\"" : "")
							+ (((Release)rom).Default != null
								? ((Release)rom).Default.ToString().ToLowerInvariant()
								: "")
							+ "/>\n";
						break;
					case ItemType.Rom:
						state += "\t\t<rom name=\"" + HttpUtility.HtmlEncode(rom.Name) + "\""
							+ (((Rom)rom).Size != -1 ? " size=\"" + ((Rom)rom).Size + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Rom)rom).CRC) ? " crc=\"" + ((Rom)rom).CRC.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Rom)rom).MD5) ? " md5=\"" + ((Rom)rom).MD5.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Rom)rom).SHA1) ? " sha1=\"" + ((Rom)rom).SHA1.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Rom)rom).SHA256) ? " sha256=\"" + ((Rom)rom).SHA256.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Rom)rom).SHA384) ? " sha384=\"" + ((Rom)rom).SHA384.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Rom)rom).SHA512) ? " sha512=\"" + ((Rom)rom).SHA512.ToLowerInvariant() + "\"" : "")
							+ (!String.IsNullOrWhiteSpace(((Rom)rom).Date) ? " date=\"" + ((Rom)rom).Date + "\"" : "")
							+ (((Rom)rom).ItemStatus != ItemStatus.None ? " status=\"" + ((Rom)rom).ItemStatus.ToString().ToLowerInvariant() + "\"" : "")
							+ "/>\n";
						break;
					case ItemType.Sample:
						state += "\t\t<sample name=\"" + HttpUtility.HtmlEncode(rom.Name) + "\""
							+ "/>\n";
						break;
				}

				sw.Write(state);
				sw.Flush();
			}
			catch (Exception ex)
			{
				Globals.Logger.Error(ex.ToString());
				return false;
			}

			return true;
		}

		/// <summary>
		/// Write out DAT footer using the supplied StreamWriter
		/// </summary>
		/// <param name="sw">StreamWriter to output to</param>
		/// <returns>True if the data was written, false on error</returns>
		private bool WriteFooter(StreamWriter sw)
		{
			try
			{
				string footer = "\t</machine>\n</datafile>\n";

				// Write the footer out
				sw.Write(footer);
				sw.Flush();
			}
			catch (Exception ex)
			{
				Globals.Logger.Error(ex.ToString());
				return false;
			}

			return true;
		}
	}
}