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>
	/// Process definitions found on command line.
	/// <para>Used to automatically run process on start up, and then close application.</para>
	/// <para>Command line examples:</para>
	/// <para>app /Process:ExportData</para>
	/// <para>app /SaProc:ExportData</para>
	/// <para>app /Proc:ProcId=ExportData;User=uat</para>
	/// <para>app /SaProcess:Proc=ExportData;User=uat</para>
	/// </summary>
	public class SacsProcessDefinition
	{
		//-------------------------------------------------------------------
		// Data members.
		private static List<String> validProcessPrefix = StringListUtil.Split("Proc,Process,SaProc,SaProcess",",");
		private static List<String> validProcessNameParam = StringListUtil.Split("Proc,Process,ProcId,ProcessId",",");

		//-------------------------------------------------------------------
		// Construction.
		public SacsProcessDefinition (String commandLineArg)
		{
			// First field should be a valid process prefix.
			if (!IsValidProcessDefinition(commandLineArg)) throw new NotSupportedException("SacsProcessDefinition Invalid process command line arg: '" + commandLineArg + "'");

			// A single colon is expected.
			String[] fields = commandLineArg.Split(':');
			if (fields.Length != 2) throw new NotSupportedException("SacsProcessDefinition Colon expected in command line arg: '" + commandLineArg + "'");

			// Extract process params.
			String[] processParams = fields[1].Split(';');
			foreach (String processParam in processParams)
			{
				// Each parameter is either delimited as 'name=value' or is interpretted as the process name if no equals.
				String[] paramValues = processParam.Split('=');
				if (paramValues.Length == 1 || (paramValues.Length == 2 && validProcessNameParam.ContainsCI(paramValues[0])))
				{
					// Parameter is the process name.
					String processName = (paramValues.Length == 1 ? paramValues[0] : paramValues[1]);
					if (!StringUtil.IsEmpty(ProcessName)) throw new NotSupportedException("SacsProcessDefinition Multiple process names in command line arg: '" + commandLineArg + "'");
					ProcessName = processName;
				}
				else
				{
					if (Params.HasValue(paramValues[0])) throw new NotSupportedException("SacsProcessDefinition Duplicate param name '"+ paramValues[0] + "' in command line arg: '" + commandLineArg + "'");
					Params.AddValue(paramValues[0], new DataValue(paramValues[1]));
				}
			}
		}

		//-------------------------------------------------------------------
		// Properties.
		public String ProcessName { get; }
		public NamedValue.Map Params { get; } = new NamedValue.Map();

		//-------------------------------------------------------------------
		// Utilities.
		public static bool IsValidProcessDefinition (String commandLineArg)
		{
			if (StringUtil.IsEmpty(commandLineArg)) return false;
			foreach (String validPrefix in validProcessPrefix)
			{
				if (commandLineArg.StartsWithCI(validPrefix + ":"))
					return true;
			}
			return false;
		}

		//-------------------------------------------------------------------
	}

	//=======================================================================
	public static class SacsProcessDefinitionList
	{
		//-------------------------------------------------------------------
		// Locate process in the list.
		public static SacsProcessDefinition GetProcessDefinition (this List<SacsProcessDefinition> values, String name)
		{
			return values.Find(item => item.ProcessName.EqualsCI(name));
		}

		//-------------------------------------------------------------------
	}

	//=======================================================================
}