//	Spludlow Software
//	Copyright © Samuel P. Ludlow 2020 All Rights Reserved
//	Distributed under the terms of the GNU General Public License version 3
//	Distributed WITHOUT ANY WARRANTY; without implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
//	https://www.spludlow.co.uk/LICENCE.TXT
//	The Spludlow logo is a registered trademark of Samuel P. Ludlow and may not be used without permission
//	v1.14

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.IO;
using System.Reflection;

namespace Spludlow.Mame
{
	public class MameConfiguration
	{
		public string DatabaseDirectory;
		public string ReportDirectory;

		public string BinariesDirectory;

		public string ImportDirectory;
		public string ExportDirectory;

		public string LinkDirectoryMachineRom;
		public string LinkDirectoryMachineDisk;
		public string LinkDirectorySoftwareRom;
		public string LinkDirectorySoftwareDisk;

		public string StoreDirectoryMachineRom;
		public string StoreDirectoryMachineDisk;
		public string StoreDirectorySoftwareRom;
		public string StoreDirectorySoftwareDisk;

		public MameConfiguration()
		{
			string directory = Environment.CurrentDirectory;

			DatabaseDirectory = directory + @"\Data";
			ReportDirectory = directory + @"\Reports";

			string configFilename = directory + @"\MHS.txt";

			using (StreamReader reader = new StreamReader(configFilename))
			{
				string line;
				while ((line = reader.ReadLine()) != null)
				{
					line = line.Trim();
					if (line.Length == 0 || line.StartsWith("#") == true)
						continue;

					string[] parts = line.Split(new char[] { '\t' }, StringSplitOptions.RemoveEmptyEntries);

					if (parts.Length != 2)
						throw new ApplicationException("Bad config line: " + line);

					string name = parts[0];
					string value = parts[1];

					FieldInfo fieldInfo = this.GetType().GetField(name);

					if (fieldInfo == null)
						throw new ApplicationException("Bad config name: " + line);

					fieldInfo.SetValue(this, value);
				}
			}
		}

		public string[][] GetAllDirectories(string startWith)
		{
			List<string[]> result = new List<string[]>();
			foreach (FieldInfo fieldInfo in this.GetType().GetFields())
			{
				string name = fieldInfo.Name;

				if (name.StartsWith(startWith) == false)
					continue;

				object value = fieldInfo.GetValue(this);

				result.Add(new string[] { name, Convert.ToString(value) });
			}

			return result.ToArray();
		}

		public string Show()
		{
			StringBuilder text = new StringBuilder();

			foreach (FieldInfo fieldInfo in this.GetType().GetFields())
			{
				text.AppendLine();

				text.Append(fieldInfo.Name);
				text.Append(":");

				object value = fieldInfo.GetValue(this);
				if (value != null)
					text.Append(Convert.ToString(value));

				text.AppendLine();
			}

			text.AppendLine();

			return text.ToString();
		}

		public string Test()
		{
			StringBuilder text = new StringBuilder();

			try
			{
				string testName = "MHS-Test-" + Spludlow.Text.TimeStamp();

				text.AppendLine("Store Directories exist");

				foreach (string startsWith in new string[] { "StoreDirectory", "LinkDirectory", "ImportDirectory", "ExportDirectory", "DatabaseDirectory", "ReportDirectory", "BinariesDirectory" })
				{
					foreach (string[] dirParts in GetAllDirectories(startsWith))
					{
						string name = dirParts[0];
						string dir = dirParts[1];

						try
						{
							bool performWriteTest = true;

							if (startsWith == "BinariesDirectory")
							{
								if (File.Exists(dir + @"\chdman.exe") == false)
									throw new ApplicationException("chdman.exe not in BinariesDirectory");

								performWriteTest = false;
							}

							//if (startsWith == "ImportDirectory")	//	Clears file attributes
							//	performWriteTest = false;

							if (performWriteTest == true)
							{
								if (Directory.Exists(dir) == false)
									Directory.CreateDirectory(dir);

								string filename = dir + @"\" + testName;
								string linkFilename = filename + ".link";

								try
								{
									File.WriteAllText(filename, testName);
									if (File.ReadAllText(filename) != testName)
										throw new ApplicationException("directory file read");

									if (startsWith == "LinkDirectory")
									{
										Spludlow.Io.FsLinks.LinkFile(linkFilename, filename);

										if (File.Exists(linkFilename) == false)
											throw new ApplicationException("directory link create");

										if (File.ReadAllText(linkFilename) != testName)
											throw new ApplicationException("directory link read");
									}
								}
								finally
								{
									if (File.Exists(linkFilename) == true)
										File.Delete(linkFilename);

									if (File.Exists(filename) == true)
										File.Delete(filename);
								}
							}

							text.AppendLine("Directory OK: " + name + ": " + dir);
						}
						catch (Exception ee)
						{
							throw new ApplicationException("Directory error: " + name + ", " + dir + ", " + ee.Message);
						}
					}
				}

				text.AppendLine("TEST PASS !!!");
			}
			catch (Exception ee)
			{
				text.AppendLine("FAIL: " + ee.Message);
			}

			return text.ToString();
		}

		public string MameRomPath()
		{
			StringBuilder text = new StringBuilder();

			text.AppendLine("MAME rompath should be:");
			text.AppendLine();

			text.Append(LinkDirectoryMachineRom);
			text.Append(";");
			text.Append(LinkDirectoryMachineDisk);
			text.Append(";");
			text.Append(LinkDirectorySoftwareRom);
			text.Append(";");
			text.Append(LinkDirectorySoftwareDisk);

			text.AppendLine();
			text.AppendLine();

			return text.ToString();

		}
	}
}