using Sarand.Net.Standard.Base.Core;
using Saxonite.Net.Standard.Dbas.App;
using Saxonite.Net.Standard.Base.App;
using Saxonite.Net.Standard.Base.Mgr;
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Utils;

namespace Saxonite.Net.Core.Web.Base.App
{
	//=======================================================================
	public class SaxSystem_Web : SaxSystem_Dbas
	{
		//-------------------------------------------------------------------
		// Data members.

		//-------------------------------------------------------------------
		/// <summary>Static initialisation.</summary>
		static SaxSystem_Web()
		{
			InitComputerName();
			InitUserName();
			InitApplicationPath();
			InitApplicationFolder();
			InitAssemblyBuildAt();
		}

		//-------------------------------------------------------------------
		// Construction.
		public SaxSystem_Web() : base()
		{
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Computer name
		/// <para>Windows: System.Environment.MachineName</para>
		/// <para>Web: HttpContext.Current.Server.MachineName</para>
		/// <para>FQDN: System.Net.Dns.GetHostName()</para>
		/// </summary>
		private static void InitComputerName()
		{
			try
			{
				ComputerName = System.Environment.MachineName;
			}
			catch (Exception exc)
			{
				SaLogger.Warn("SaxSystem.InitComputerName Failed to initialise computer name from environment. " + ExceptionUtil.GetErrorStateMessage(exc));
			}
			try
			{
				if (StringUtil.IsEmpty(ComputerName))
					ComputerName = Environment.GetEnvironmentVariable("COMPUTERNAME") ?? Environment.GetEnvironmentVariable("HOSTNAME");
			}
			catch (Exception exc)
			{
				SaLogger.Warn("SaxSystem.InitComputerName Failed to initialise computer name from environment variable. " + ExceptionUtil.GetErrorStateMessage(exc));
			}
		}

		//-------------------------------------------------------------------
		/// <summary>To be populated by application<para>Windows: Environment.UserName</para></summary>
		private static void InitUserName()
		{
			try
			{
				UserName = Environment.UserName;
			}
			catch (Exception exc)
			{
				SaLogger.Warn("SaxSystem.InitUserName Failed to initialise user name. " + ExceptionUtil.GetErrorStateMessage(exc));
			}
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Application Path.
		/// <para>Windows: System.Reflection.Assembly.GetEntryAssembly().Location;</para>
		/// </summary>
		private static void InitApplicationPath()
		{
			try
			{
				ApplicationPath = Assembly.GetEntryAssembly().Location;
			}
			catch (Exception exc)
			{
				SaLogger.Warn("SaxSystem.InitApplicationPath Failed to initialise application path. " + ExceptionUtil.GetErrorStateMessage(exc));
			}
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Application folder.
		/// <para>Windows: System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetEntryAssembly().Location);</para>
		/// </summary>
		private static void InitApplicationFolder()
		{
			try
			{
				ApplicationFolder = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
			}
			catch (Exception exc)
			{
				SaLogger.Warn("SaxSystem.InitApplicationFolder Failed to initialise application folder. " + ExceptionUtil.GetErrorStateMessage(exc));
			}
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// DateTime when the executing assembly was built.
		/// </summary>
		private static void InitAssemblyBuildAt()
		{
			try
			{
				// Assembly build date.
				Assembly assembly = Assembly.GetExecutingAssembly();
				AssemblyBuildAt = File.GetLastWriteTime(assembly.Location);
			}
			catch (Exception exc)
			{
				SaLogger.Warn("SaxSystem.InitAssemblyBuildAt Failed to initialise assembly build date. " + ExceptionUtil.GetErrorStateMessage(exc));
			}
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}