using RHLauncher.RHLauncher.i8n;
using System.Security.Cryptography;

namespace RHLauncher.RHLauncher.Helper
{
    public class ServiceFileHandler
    {
        private readonly string _iniFilePath;
        private readonly string _installDirectory;

        public ServiceFileHandler(string iniFileName, string installDirectory)
        {
            _iniFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, iniFileName);
            _installDirectory = installDirectory;
        }

        public void UpdateService()
        {
            string service = new IniFile(_iniFilePath).ReadValue("Info", "Service");
            string md5 = CalculateMD5(service);

            string serviceDatPath = Path.Combine(_installDirectory, "Service.dat");

            try
            {
                if (File.Exists(serviceDatPath))
                {
                    string[] lines = File.ReadAllLines(serviceDatPath);

                    string currentMd5 = lines[0];
                    string currentService = string.Join(Environment.NewLine, lines, 1, lines.Length - 1);

                    if (currentMd5 != md5)
                    {
                        lines[0] = md5;
                        File.WriteAllLines(serviceDatPath, lines);
                    }
                }
                else
                {
                    MsgBoxForm.Show(LocalizedStrings.ServiceDatFileMissing, LocalizedStrings.Error);
                    return;
                }
            }
            catch (Exception ex)
            {
                MsgBoxForm.Show(LocalizedStrings.ServiceUpdateError + ": " + ex.Message, LocalizedStrings.Error);
            }
        }

        private static string CalculateMD5(string input)
        {
            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
            byte[] hashBytes = MD5.HashData(inputBytes);
            return BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
        }
    }
}