using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Text.RegularExpressions;

namespace LeagueAPI.Utils;

internal partial class PortTokenWithProcessList : IPortTokenBehavior
{
    [GeneratedRegex("--remoting-auth-token=([\\w-]*)")]
    private static partial Regex AuthTokenRegex();
    [GeneratedRegex("--app-port=([0-9]*)")]
    private static partial Regex AppPortRegex();

    public bool TryGet(Process process, out string remotingAuthToken, out int appPort, [NotNullWhen(false)] out Exception? exception)
    {
        try
        {
            ProcessStartInfo startInfo;
            if (OperatingSystem.IsWindows())
            {
                startInfo = new ProcessStartInfo
                {
                    FileName = "powershell.exe",
                    Arguments = "Get-CimInstance Win32_Process -Filter \"\"\"name = 'LeagueClientUx.exe'\"\"\" | Select-Object -ExpandProperty CommandLine",
                    WindowStyle = ProcessWindowStyle.Hidden,
                    CreateNoWindow = true,
                    RedirectStandardOutput = true,
                    RedirectStandardError = true
                };
            }
            else
            {
                if (!OperatingSystem.IsMacOS())
                {
                    throw new PlatformNotSupportedException("This behavior is only supported on Windows or MacOS.");
                }

                startInfo = new ProcessStartInfo
                {
                    FileName = "/bin/bash",
                    Arguments = "-c \"ps x -o args | grep 'LeagueClientUx'\"",
                    WindowStyle = ProcessWindowStyle.Hidden,
                    CreateNoWindow = true,
                    RedirectStandardOutput = true,
                    RedirectStandardError = true
                };
            }

            using Process process2 = new()
            {
                StartInfo = startInfo
            };
            process2.Start();
            process2.WaitForExit();
            string text = process2.StandardOutput.ReadToEnd();
            string text2 = process2.StandardError.ReadToEnd();
            if (string.IsNullOrEmpty(text))
            {
                if (!string.IsNullOrEmpty(text2))
                {
                    throw new Exception(text2);
                }

                throw new FormatException("The output string is empty.");
            }

            remotingAuthToken = AuthTokenRegex().Match(text).Groups[1].Value;
            appPort = int.Parse(AppPortRegex().Match(text).Groups[1].Value);
            exception = null;
            return true;
        }
        catch (Exception ex)
        {
            remotingAuthToken = string.Empty;
            appPort = 0;
            exception = ex;
            return false;
        }
    }
}