using System;
using System.IO;
using CommonLibrary;
namespace Mitria_Minecraft_Launcher.Updater
{
    internal class LauncherUpdate
    {
        public LauncherUpdateStatus Start()
        {
            Downloader downloader = new Downloader();
            CommonLibrary.Log.INFO("Launcher Update Process Start");

            string verionData = downloader.DownloadString(Settings.ServerBaseUrl + Settings.ServerLauncherPatchInformationFile);
            if (verionData == string.Empty)
            {
                return LauncherUpdateStatus.Fail;
            }

            LauncherPatchInformation launcherPatchInformation = CommonLibrary.XmlSystem.LoadFromData<LauncherPatchInformation>(verionData);
            Version thisVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            Version remoteVersion = Version.Parse(launcherPatchInformation.Version);
            CommonLibrary.Log.INFO("Launcher Version : " + thisVersion);
            CommonLibrary.Log.INFO("Remote Launcher Version : " + remoteVersion);
            int result = remoteVersion.CompareTo(thisVersion);

            if (result <= 0)
            {
                CommonLibrary.Log.INFO("Version Same");
                return LauncherUpdateStatus.Same;
            }
            else
            {
                CommonLibrary.Log.INFO("Launcher Update");
                string tempDirectory = Path.GetFullPath("temp");
                if (!System.IO.Directory.Exists(tempDirectory))
                {
                    System.IO.Directory.CreateDirectory("temp");
                }

                string downloadUrl = CommonLibrary.Extensions.PathCombineL(Settings.ServerBaseUrl, launcherPatchInformation.LauncherUrl, launcherPatchInformation.LauncherFileName);
                string newLauncherFile = CommonLibrary.Extensions.PathCombineW(tempDirectory, launcherPatchInformation.LauncherFileName);
                downloader.DownloadFile(downloadUrl, newLauncherFile);
                string launcherFile = System.Reflection.Assembly.GetExecutingAssembly().Location;
                string oldLauncherFile = CommonLibrary.Extensions.PathCombineW(tempDirectory, System.Reflection.Assembly.GetExecutingAssembly().GetName().Name + "_old");

                System.IO.File.Move(launcherFile, oldLauncherFile);
                System.IO.File.Move(newLauncherFile, launcherFile);
                return LauncherUpdateStatus.Update;
            }
        }
    }

    internal enum LauncherUpdateStatus
    {
        Update,
        Same,
        Fail
    }
}