using System;
using System.Collections.Generic;
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 an OfflineList XML DAT
	/// </summary>
	/// TODO: Verify that all write for this DatFile type is correct
	internal class OfflineList : DatFile
	{
		/// <summary>
		/// Constructor designed for casting a base DatFile
		/// </summary>
		/// <param name="datFile">Parent DatFile to copy from</param>
		public OfflineList(DatFile datFile)
			: base(datFile, cloneHeader: false)
		{
		}

		/// <summary>
		/// Parse an OfflineList 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>
		/// <remarks>
		/// </remarks>
		public override void ParseFile(
			// Standard Dat parsing
			string filename,
			int sysid,
			int srcid,

			// Miscellaneous
			bool keep,
			bool clean,
			bool remUnicode)
		{
			Encoding enc = Utilities.GetEncoding(filename);
			XmlReader xtr = Utilities.GetXmlTextReader(filename);

			// 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)
					{
						xtr.Read();
						continue;
					}

					switch (xtr.Name)
					{
						case "configuration":
							ReadConfiguration(xtr.ReadSubtree(), keep);

							// Skip the configuration node now that we've processed it
							xtr.Skip();
							break;
						case "games":
							ReadGames(xtr.ReadSubtree(), keep, clean, remUnicode);

							// Skip the games node 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 configuration 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 ReadConfiguration(XmlReader reader, bool keep)
		{
			bool superdat = false;

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

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all configuration items (ONLY OVERWRITE IF THERE'S NO DATA)
				string content = "";
				switch (reader.Name.ToLowerInvariant())
				{
					case "datname":
						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 "datversion":
						content = reader.ReadElementContentAsString();
						Version = (String.IsNullOrWhiteSpace(Version) ? content : Version);
						break;
					case "system":
						content = reader.ReadElementContentAsString();
						// string system = content;
						break;
					case "screenshotswidth":
						content = reader.ReadElementContentAsString();
						// string screenshotsWidth = content; // Int32?
						break;
					case "screenshotsheight":
						content = reader.ReadElementContentAsString();
						// string screenshotsHeight = content; // Int32?
						break;
					case "infos":
						ReadInfos(reader.ReadSubtree());

						// Skip the infos node now that we've processed it
						reader.Skip();
						break;
					case "canopen":
						ReadCanOpen(reader.ReadSubtree());

						// Skip the canopen node now that we've processed it
						reader.Skip();
						break;
					case "newdat":
						ReadNewDat(reader.ReadSubtree());

						// Skip the newdat node now that we've processed it
						reader.Skip();
						break;
					case "search":
						ReadSearch(reader.ReadSubtree());

						// Skip the search node now that we've processed it
						reader.Skip();
						break;
					case "romtitle":
						content = reader.ReadElementContentAsString();
						// string romtitle = content;

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

		/// <summary>
		/// Read infos information
		/// </summary>
		/// <param name="reader">XmlReader to use to parse the header</param>
		private void ReadInfos(XmlReader reader)
		{
			// If there's no subtree to the configuration, skip it
			if (reader == null)
			{
				return;
			}

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all infos items
				switch (reader.Name.ToLowerInvariant())
				{
					case "title":
						// string title_visible = reader.GetAttribute("visible"); // (true|false)
						// string title_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string title_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "location":
						// string location_visible = reader.GetAttribute("visible"); // (true|false)
						// string location_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string location_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "publisher":
						// string publisher_visible = reader.GetAttribute("visible"); // (true|false)
						// string publisher_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string publisher_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "sourcerom":
						// string sourceRom_visible = reader.GetAttribute("visible"); // (true|false)
						// string sourceRom_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string sourceRom_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "savetype":
						// string saveType_visible = reader.GetAttribute("visible"); // (true|false)
						// string saveType_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string saveType_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "romsize":
						// string romSize_visible = reader.GetAttribute("visible"); // (true|false)
						// string romSize_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string romSize_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "releasenumber":
						// string releaseNumber_visible = reader.GetAttribute("visible"); // (true|false)
						// string releaseNumber_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string releaseNumber_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "languagenumber":
						// string languageNumber_visible = reader.GetAttribute("visible"); // (true|false)
						// string languageNumber_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string languageNumber_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "comment":
						// string comment_visible = reader.GetAttribute("visible"); // (true|false)
						// string comment_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string comment_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "romcrc":
						// string romCRC_visible = reader.GetAttribute("visible"); // (true|false)
						// string romCRC_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string romCRC_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "im1crc":
						// string im1CRC_visible = reader.GetAttribute("visible"); // (true|false)
						// string im1CRC_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string im1CRC_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "im2crc":
						// string im2CRC_visible = reader.GetAttribute("visible"); // (true|false)
						// string im2CRC_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string im2CRC_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					case "languages":
						// string languages_visible = reader.GetAttribute("visible"); // (true|false)
						// string languages_inNamingOption = reader.GetAttribute("inNamingOption"); // (true|false)
						// string languages_default = reader.GetAttribute("default"); // (true|false)
						reader.Read();
						break;
					default:
						reader.Read();
						break;
				}
			}
		}

		/// <summary>
		/// Read canopen information
		/// </summary>
		/// <param name="reader">XmlReader to use to parse the header</param>
		private void ReadCanOpen(XmlReader reader)
		{
			// Prepare all internal variables
			List<string> extensions = new List<string>();

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

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all canopen items
				switch (reader.Name.ToLowerInvariant())
				{
					case "extension":
						extensions.Add(reader.ReadElementContentAsString());
						break;
					default:
						reader.Read();
						break;
				}
			}
		}

		/// <summary>
		/// Read newdat information
		/// </summary>
		/// <param name="reader">XmlReader to use to parse the header</param>
		private void ReadNewDat(XmlReader reader)
		{
			// If there's no subtree to the configuration, skip it
			if (reader == null)
			{
				return;
			}

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all newdat items
				string content = "";
				switch (reader.Name.ToLowerInvariant())
				{
					case "datversionurl":
						content = reader.ReadElementContentAsString();
						Url = (String.IsNullOrWhiteSpace(Name) ? content : Url);
						break;
					case "daturl":
						// string fileName = reader.GetAttribute("fileName");
						content = reader.ReadElementContentAsString();
						// string url = content;
						break;
					case "imurl":
						content = reader.ReadElementContentAsString();
						// string url = content;
						break;
					default:
						reader.Read();
						break;
				}
			}
		}

		/// <summary>
		/// Read search information
		/// </summary>
		/// <param name="reader">XmlReader to use to parse the header</param>
		private void ReadSearch(XmlReader reader)
		{
			// If there's no subtree to the configuration, skip it
			if (reader == null)
			{
				return;
			}

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all search items
				string content = "";
				switch (reader.Name.ToLowerInvariant())
				{
					case "to":
						// string value = reader.GetAttribute("value");
						// string default = reader.GetAttribute("default"); (true|false)
						// string auto = reader.GetAttribute("auto"); (true|false)

						ReadTo(reader.ReadSubtree());

						// Skip the to node now that we've processed it
						reader.Skip();
						break;
					default:
						reader.Read();
						break;
				}
			}
		}

		/// <summary>
		/// Read to information
		/// </summary>
		/// <param name="reader">XmlReader to use to parse the header</param>
		private void ReadTo(XmlReader reader)
		{
			// If there's no subtree to the configuration, skip it
			if (reader == null)
			{
				return;
			}

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all search items
				string content = "";
				switch (reader.Name.ToLowerInvariant())
				{
					case "find":
						// string operation = reader.GetAttribute("operation");
						// string value = reader.GetAttribute("value"); // Int32?
						content = reader.ReadElementContentAsString();
						// string findValue = content;
						break;
					default:
						reader.Read();
						break;
				}
			}
		}

		/// <summary>
		/// Read games 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>
		/// <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 ReadGames(XmlReader reader,

			// Miscellaneous
			bool keep,
			bool clean,
			bool remUnicode)
		{
			// If there's no subtree to the configuration, skip it
			if (reader == null)
			{
				return;
			}

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all games items (ONLY OVERWRITE IF THERE'S NO DATA)
				switch (reader.Name.ToLowerInvariant())
				{
					case "game":
						ReadGame(reader.ReadSubtree(), keep, clean, remUnicode);

						// Skip the game node now that we've processed it
						reader.Skip();
						break;
					default:
						reader.Read();
						break;
				}
			}
		}

		/// <summary>
		/// Read game 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>
		/// <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 ReadGame(XmlReader reader,

			// Miscellaneous
			bool keep,
			bool clean,
			bool remUnicode)
		{
			// Prepare all internal variables
			string releaseNumber = "", key = "", publisher = "", duplicateid = "";
			long size = -1;
			List<Rom> roms = new List<Rom>();
			Machine machine = new Machine();

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

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all games items
				string content = "";
				switch (reader.Name.ToLowerInvariant())
				{
					case "imagenumber":
						content = reader.ReadElementContentAsString();
						// string imageNumber = content;

						break;
					case "releasenumber":
						releaseNumber = reader.ReadElementContentAsString();

						break;
					case "title":
						content = reader.ReadElementContentAsString();
						machine.Name = content;

						break;
					case "savetype":
						content = reader.ReadElementContentAsString();
						// string saveType = content;

						break;
					case "romsize":
						if (!Int64.TryParse(reader.ReadElementContentAsString(), out size))
						{
							size = -1;
						}

						break;
					case "publisher":
						publisher = reader.ReadElementContentAsString();

						break;
					case "location":
						content = reader.ReadElementContentAsString();
						// string location = content;

						break;
					case "sourcerom":
						content = reader.ReadElementContentAsString();
						// string sourceRom = content;

						break;
					case "language":
						content = reader.ReadElementContentAsString();
						// string language = content;

						break;
					case "files":
						roms = ReadFiles(reader.ReadSubtree(), releaseNumber, machine.Name, keep, clean, remUnicode);

						// Skip the files node now that we've processed it
						reader.Skip();
						break;
					case "im1crc":
						content = reader.ReadElementContentAsString();
						// string im1crc = content;

						break;
					case "im2crc":
						content = reader.ReadElementContentAsString();
						// string im2crc = content;

						break;
					case "comment":
						machine.Comment = reader.ReadElementContentAsString();

						break;
					case "duplicateid":
						duplicateid = reader.ReadElementContentAsString();
						if (duplicateid != "0")
						{
							machine.CloneOf = duplicateid;
						}

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

			// Add information accordingly for each rom
			for (int i = 0; i < roms.Count; i++)
			{
				roms[i].Size = size;
				roms[i].Publisher = publisher;
				roms[i].CopyMachineInformation(machine);

				// Now process and add the rom
				key = ParseAddHelper(roms[i], clean, remUnicode);
			}
		}

		/// <summary>
		/// Read files information
		/// </summary>
		/// <param name="reader">XmlReader to use to parse the header</param>
		/// <param name="releaseNumber">Release number from the parent game</param>
		/// <param name="machineName">Name of the parent game to use</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 List<Rom> ReadFiles(XmlReader reader,
			string releaseNumber,
			string machineName,

			// Miscellaneous
			bool keep,
			bool clean,
			bool remUnicode)
		{
			// Prepare all internal variables
			List<Tuple<string, string>> extensionToCrc = new List<Tuple<string, string>>();
			List<Rom> roms = new List<Rom>();

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

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

			// Otherwise, read what we can from the header
			while (!reader.EOF)
			{
				// We only want elements
				if (reader.NodeType != XmlNodeType.Element)
				{
					reader.Read();
					continue;
				}

				// Get all romCRC items
				switch (reader.Name.ToLowerInvariant())
				{
					case "romcrc":
						extensionToCrc.Add(
							new Tuple<string, string>(
								reader.GetAttribute("extension") ?? "",
								reader.ReadElementContentAsString().ToLowerInvariant()));
						break;
					default:
						reader.Read();
						break;
				}
			}

			// Now process the roms with the proper information
			foreach (Tuple<string, string> pair in extensionToCrc)
			{
				roms.Add(new Rom()
				{
					Name = (releaseNumber != "0" ? releaseNumber + " - " : "") + machineName + pair.Item1,
					CRC = Utilities.CleanHashData(pair.Item2, Constants.CRCLength),

					ItemStatus = ItemStatus.None,
				});
			}

			return roms;
		}

		/// <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 "null" game (created by DATFromDir or something similar), log it to file
						if (rom.ItemType == 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\" standalone=\"no\"?>\n"
							+ "<dat xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:noNamespaceSchemaLocation=\"datas.xsd\">\n"
							+ "\t<configuration>\n"
							+ "\t\t<datName>" + HttpUtility.HtmlEncode(Name) + "</datName>\n"
							+ "\t\t<datVersion>" + Count + "</datVersion>\n"
							+ "\t\t<system>none</system>\n"
							+ "\t\t<screenshotsWidth>240</screenshotsWidth>\n"
							+ "\t\t<screenshotsHeight>160</screenshotsHeight>\n"
							+ "\t\t<infos>\n"
							+ "\t\t\t<title visible=\"false\" inNamingOption=\"true\" default=\"false\"/>\n"
							+ "\t\t\t<location visible=\"true\" inNamingOption=\"true\" default=\"true\"/>\n"
							+ "\t\t\t<publisher visible=\"true\" inNamingOption=\"true\" default=\"true\"/>\n"
							+ "\t\t\t<sourceRom visible=\"true\" inNamingOption=\"true\" default=\"true\"/>\n"
							+ "\t\t\t<saveType visible=\"true\" inNamingOption=\"true\" default=\"true\"/>\n"
							+ "\t\t\t<romSize visible=\"true\" inNamingOption=\"true\" default=\"true\"/>\n"
							+ "\t\t\t<releaseNumber visible=\"true\" inNamingOption=\"true\" default=\"false\"/>\n"
							+ "\t\t\t<languageNumber visible=\"true\" inNamingOption=\"true\" default=\"false\"/>\n"
							+ "\t\t\t<comment visible=\"true\" inNamingOption=\"true\" default=\"false\"/>\n"
							+ "\t\t\t<romCRC visible=\"true\" inNamingOption=\"true\" default=\"false\"/>\n"
							+ "\t\t\t<im1CRC visible=\"false\" inNamingOption=\"false\" default=\"false\"/>\n"
							+ "\t\t\t<im2CRC visible=\"false\" inNamingOption=\"false\" default=\"false\"/>\n"
							+ "\t\t\t<languages visible=\"true\" inNamingOption=\"true\" default=\"true\"/>\n"
							+ "\t\t</infos>\n"
							+ "\t\t<canOpen>\n"
							+ "\t\t\t<extension>.bin</extension>\n"
							+ "\t\t</canOpen>\n"
							+ "\t\t<newDat>\n"
							+ "\t\t\t<datVersionURL>" + HttpUtility.HtmlEncode(Url) + "</datVersionURL>\n"
							+ "\t\t\t<datURL fileName=\"" + HttpUtility.HtmlEncode(FileName) + ".zip\">" + HttpUtility.HtmlEncode(Url) + "</datURL>\n"
							+ "\t\t\t<imURL>" + HttpUtility.HtmlEncode(Url) + "</imURL>\n"
							+ "\t\t</newDat>\n"
							+ "\t\t<search>\n"
							+ "\t\t\t<to value=\"location\" default=\"true\" auto=\"true\"/>\n"
							+ "\t\t\t<to value=\"romSize\" default=\"true\" auto=\"false\"/>\n"
							+ "\t\t\t<to value=\"languages\" default=\"true\" auto=\"true\"/>\n"
							+ "\t\t\t<to value=\"saveType\" default=\"false\" auto=\"false\"/>\n"
							+ "\t\t\t<to value=\"publisher\" default=\"false\" auto=\"true\"/>\n"
							+ "\t\t\t<to value=\"sourceRom\" default=\"false\" auto=\"true\"/>\n"
							+ "\t\t</search>\n"
							+ "\t\t<romTitle >%u - %n</romTitle>\n"
							+ "\t</configuration>\n"
							+ "\t<games>\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>
		/// <returns>True if the data was written, false on error</returns>
		private bool WriteEndGame(StreamWriter sw)
		{
			try
			{
				string state = "\t\t</game>\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.ItemType == ItemType.Rom
				&& (((Rom)rom).Size == 0 || ((Rom)rom).Size == -1)))
			{
				return true;
			}

			try
			{
				string state = "";

				// Pre-process the item name
				ProcessItemName(rom, true);

				state += "\t\t<game>\n"
							+ "\t\t\t<imageNumber>1</imageNumber>\n"
							+ "\t\t\t<releaseNumber>1</releaseNumber>\n"
							+ "\t\t\t<title>" + (!ExcludeFields[(int)Field.Name] ? HttpUtility.HtmlEncode(rom.Name) : "") + "</title>\n"
							+ "\t\t\t<saveType>None</saveType>\n";

				if (rom.ItemType == ItemType.Rom)
				{
					state += "\t\t\t<romSize>" + (!ExcludeFields[(int)Field.Size] ? ((Rom)rom).Size.ToString() : "") + "</romSize>\n";
				}

				state += "\t\t\t<publisher>None</publisher>\n"
					+ "\t\t\t<location>0</location>\n"
					+ "\t\t\t<sourceRom>None</sourceRom>\n"
					+ "\t\t\t<language>0</language>\n";

				if (rom.ItemType == ItemType.Disk)
				{
					state += "\t\t\t<files>\n"
						+ (((Disk)rom).MD5 != null
							? "\t\t\t\t<romMD5 extension=\".chd\">" + (!ExcludeFields[(int)Field.MD5] ? ((Disk)rom).MD5.ToUpperInvariant() : "") + "</romMD5>\n"
							: "\t\t\t\t<romSHA1 extension=\".chd\">" + (!ExcludeFields[(int)Field.SHA1] ? ((Disk)rom).SHA1.ToUpperInvariant() : "") + "</romSHA1>\n")
						+ "\t\t\t</files>\n";
				}
				else if (rom.ItemType == ItemType.Rom)
				{
					string tempext = "." + Utilities.GetExtension(((Rom)rom).Name);

					state += "\t\t\t<files>\n"
						+ (((Rom)rom).CRC != null
							? "\t\t\t\t<romCRC extension=\"" + tempext + "\">" + (!ExcludeFields[(int)Field.CRC] ? ((Rom)rom).CRC.ToUpperInvariant() : "") + "</romCRC>\n"
							: ((Rom)rom).MD5 != null
								? "\t\t\t\t<romMD5 extension=\"" + tempext + "\">" + (!ExcludeFields[(int)Field.MD5] ? ((Rom)rom).MD5.ToUpperInvariant() : "") + "</romMD5>\n"
								: "\t\t\t\t<romSHA1 extension=\"" + tempext + "\">" + (!ExcludeFields[(int)Field.SHA1] ? ((Rom)rom).SHA1.ToUpperInvariant() : "") + "</romSHA1>\n")
						+ "\t\t\t</files>\n";
				}

				state += "\t\t\t<im1CRC>00000000</im1CRC>\n"
					+ "\t\t\t<im2CRC>00000000</im2CRC>\n"
					+ "\t\t\t<comment></comment>\n"
					+ "\t\t\t<duplicateID>0</duplicateID>\n"
					+ "\t\t</game>\n";

				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\t</game>"
							+ "\t</games>\n"
							+ "\t<gui>\n"
							+ "\t\t<images width=\"487\" height=\"162\">\n"
							+ "\t\t\t<image x=\"0\" y=\"0\" width=\"240\" height=\"160\"/>\n"
							+ "\t\t\t<image x=\"245\" y=\"0\" width=\"240\" height=\"160\"/>\n"
							+ "\t\t</images>\n"
							+ "\t</gui>\n"
							+ "</dat>";

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

			return true;
		}
	}
}