using System.Diagnostics;

namespace Password_Manager
{
	public delegate void ProcessSuccess();
	public delegate void ProcessFailure(Exception e);
	static class ProcessBuilder
	{
		public ProcessSuccess? ProcessFinished;
		public ProcessFailure? ProcessFailed;

		public static void Run(string procName, string args)
		{
			try
			{
				Process.Start(procName, args);
				ProcessFinished?.Invoke();
			}
			catch (Exception e)
			{
				ProcessFailed?.Invoke(e);
			}

			ClearDelegate()
		}

		private void ClearDelegate()
		{
			//clear delegate because static
			if (ProcessFinished != null)
			{
				foreach (ProcessSuccess p in ProcessFinished)
				{
					ProcessFinished -= p;
				}
			}
			if (ProcessFailed != null)
			{
				foreach (ProcessFailure p in ProcessFailed)
				{
					ProcessFailed -= p;
				}
			}
		}
		
		public static string? GetOutput(string procName, string args)
		{
			try
			{
				Process proc = new Process()
				{
					StartInfo = new ProcessStartInfo
					{
						FileName = procName,
						Arguments = args,
						UseShellExecute = false,
						RedirectStandardOutput = true;
						CreateNoWindow = true;
					}
				};

				proc.Start();

				StringBuilder builder = new StringBuilder();
				while (!proc.StandardOutput.EndOfStream)
				{
					builder.Append(proc.StandardOutput.ReadLine());
				}

				ProcessFinished?.Invoke();
				return builder.ToString();
			} catch (Exception e)
			{
                MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
				ProcessFailed.Invoke(e);
			}

			ClearDelegate();
			
			return null;
		}
	}
}