using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;

namespace LeagueAPI.Utils;

internal class PortTokenWithLockfile : IPortTokenBehavior
{
    public bool TryGet(Process process, out string remotingAuthToken, out int appPort, [NotNullWhen(false)] out Exception? exception)
    {
        try
        {
            DirectoryInfo directory = new(Path.GetDirectoryName(process.MainModule?.FileName) ?? throw new FileNotFoundException("Lockfile not found.", "lockfile"));
            FileInfo lockfile = new(Path.Join(directory.FullName, "lockfile"));
            while (!lockfile.Exists)
            {
                if (directory.Root == directory)
                {
                    break;
                }
                directory = directory.Parent ?? directory.Root;
                lockfile = new(Path.Join(directory.FullName, "lockfile"));
            }

            using FileStream stream = lockfile.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            using StreamReader streamReader = new(stream);
            string[] array = streamReader.ReadToEnd().Split(":");
            if (array is not [string clientName, string pid, string port, string secret, string protocol] || !int.TryParse(port, out appPort))
            {
                throw new Exception("Failed to parse lockfile.");
            }
            remotingAuthToken = secret;
            exception = null;
            return true;
        }
        catch (Exception ex)
        {
            remotingAuthToken = string.Empty;
            appPort = 0;
            exception = ex;
            return false;
        }
    }
}