using System;
using System.Collections.Generic;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.Utils;

namespace Sarand.Net.Standard.Base.App
{
	//=======================================================================
	/// <summary>
	/// Aids in parsing the command line at application startup. 
	/// <para>Ref. CCommandLineInfo Class</para>
	/// </summary>
	public class SacsCommandLineInfo
	{
		//-------------------------------------------------------------------
		// Definitions.
		public class Param
		{
			internal Param (String name, String value)
			{
				Name = StringUtil.EmptyOnNull(name);
				Value = StringUtil.EmptyOnNull(value);
			}
			public String Name { get; }
			public String Value { get; }
		}
		public enum ShellCommand
		{
			/// <summary>Indicates that no file name was found on the command line.</summary>
			FileNew,
			/// <summary>Indicates that a file name was found on the command line and that none of the following flags were found on the command line: /p, /pt, /dde.</summary>
			FileOpen,
			/// <summary>Indicates that the /p flag was found on the command line.</summary>
			FilePrint,
			/// <summary>Indicates that the /pt flag was found on the command line.</summary>
			FilePrintTo,
			/// <summary>Indicates that the /dde flag was found on the command line.</summary>
			FileDDE,
			/// <summary>Indicates that the /Register or /Regserver flag was found on the command line and the application was asked to register.</summary>
			AppRegister,
			/// <summary>Indicates that the /Unregister or /Unregserver application was asked to unregister.</summary>
			AppUnregister,
			/// <summary>Indicates that the application was restarted by the restart manager.</summary>
			RestartByRestartManager,
			FileNothing = -1
		};

		//-------------------------------------------------------------------
		// Data members.
		private readonly List<String> parameters = new List<string>();

		//-------------------------------------------------------------------
		// Construction.
		public SacsCommandLineInfo (string[] args)
		{
			// Intercept specific arguments.
			foreach (String arg in args)
			{
				if (arg.EqualsCI("/Automation")) RunAutomated = true;
				if (arg.EqualsCI("/Embedding")) RunEmbedded = true;
			}

			// Store raw parameters.
			parameters.AddRange(args);

			// Extract process definitions.
			foreach (String arg in args)
			{
				if (arg.StartsWith("-") || arg.StartsWith("/"))
				{
					String processDfnArg = StringUtil.SubstringSafe(arg,1);
					if (SacsProcessDefinition.IsValidProcessDefinition(processDfnArg))
					{
						try
						{
							processDefinitions.Add(new SacsProcessDefinition(processDfnArg));
						}
						catch (Exception exc)
						{
							SaLogger.Warn($"{GetType().Name}.CTR Invalid process definition: {exc.Message}", true);
						}
					}
				}
			}
		}

		//-------------------------------------------------------------------
		// Properties.
		/// <summary>Indicates that the /Automation flag was found on the command line.</summary>
		public bool RunAutomated { get; private set; } = false;
		/// <summary>Indicates that the /Embedding flag was found on the command line.</summary>
		public bool RunEmbedded { get; private set; } = false;
		/// <summary>Indicates that the splash screen should be displayed.</summary>
		public bool ShowSplash { get; private set; } = false;

		//-------------------------------------------------------------------
		// Printing properties.
		/// <summary>Indicates the file name to be opened or printed; empty if the shell command is New or DDE.<para>The value of the first non-flag parameter on the command line.</para></summary>
		public String FileName { get; private set; } = "";
		/// <summary>Indicates the printer name if the shell command is Print To; otherwise empty.<para>The value of the second non-flag parameter on the command line.</para></summary>
		public String PrinterName { get; private set; } = "";
		/// <summary>Indicates the driver name if the shell command is Print To; otherwise empty.<para>The value of the third non-flag parameter on the command line.</para></summary>
		public String DriverName { get; private set; } = "";
		/// <summary>Indicates the port name if the shell command is Print To; otherwise empty.<para>The value of the fourth non-flag parameter on the command line.</para></summary>
		public String PortName { get; private set; } = "";

		//-------------------------------------------------------------------
		// Restart properties.
		/// <summary>
		/// Indicates the unique restart identifier for the restart manager if the restart manager restarted the application.
		/// <para>The restart identifier is unique for each instance of the application.</para>
		/// <para>If the restart manager exits the application and is configured to restart it, the restart manager executes the application from the command line with the restart identifier as an optional parameter.</para>
		/// <para>When the restart manager uses the restart identifier, the application can reopen the previously open documents and recover autosaved files.</para>
		/// </summary>
		public String RestartIdentifier { get; private set; } = "";

		//-------------------------------------------------------------------
		// Application parameters.
		public int ParamCount { get { return parameters.Count; } }
		public List<String> Params { get { return new List<string>(parameters); } }

		// Redirected from.
		public String RedirectedFrom { get; private set; } = "";

		//-------------------------------------------------------------------
		// Process definitions.
		public readonly List<SacsProcessDefinition> processDefinitions = new List<SacsProcessDefinition>();
		public List<SacsProcessDefinition> ProcessDefinitions { get { return new List<SacsProcessDefinition>(processDefinitions); } }

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