using System;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using DTLib.Dtsod;
using DTLib.Extensions;
using DTLib.Filesystem;
using DTLib.Logging;
using DTLib.Network;

namespace launcher_server;

static class Server
{
    private static ILogger logger = new CompositeLogger(
        new FileLogger("logs","launcher_server"),
        new ConsoleLogger());
    static readonly Socket mainSocket = new(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    static DtsodV23 config;
    static bool debug;

    static object manifestLocker = new();

    static void Main(string[] args)
    {
        try
        {
            Console.Title = "minecraft_launcher_server";
            Console.InputEncoding = Encoding.Unicode;
            Console.OutputEncoding = Encoding.Unicode;
            DTLibInternalLogging.SetLogger(logger);
            config = new DtsodV23(File.ReadAllText("launcher-server.dtsod"));
            if (args.Contains("debug")) debug = true;
            logger.LogInfo("Main",  $"local address: {config["local_ip"]}");
            logger.LogInfo("Main", $"public address: {OldNetwork.GetPublicIP()}");
                logger.LogInfo("Main", $"port: {config["local_port"]}");
            mainSocket.Bind(new IPEndPoint(IPAddress.Parse(config["local_ip"]), config["local_port"]));
            mainSocket.Listen(1000);
            CreateManifests();
            logger.LogInfo("Main", "server started succesfully");
            // запуск отдельного потока для каждого юзера
            logger.LogInfo("Main", "waiting for users");
            while (true)
            {
                var userSocket = mainSocket.Accept();
                var userThread = new Thread(obj => HandleUser((Socket)obj));
                userThread.Start(userSocket);
            }
        }
        catch (Exception ex)
        {
            logger.LogError("Main", ex);
            mainSocket.Close();
        }
        logger.LogInfo("Main",  "");
    }

    // запускается для каждого юзера в отдельном потоке
    static void HandleUser(Socket handlerSocket)
    {
        logger.LogInfo(nameof(HandleUser), "user connecting...  ");
        try
        {
            // тут запрос пароля заменён запросом заглушки
            handlerSocket.SendPackage("requesting user name");
            string connectionString = handlerSocket.GetPackage().BytesToString();
            FSP fsp = new(handlerSocket);
            FSP.debug = debug;
            // запрос от апдейтера
            if (connectionString == "minecraft-launcher")
            {
                logger.LogInfo(nameof(HandleUser), "incoming connection from minecraft-launcher");
                handlerSocket.SendPackage("minecraft-launcher OK");
                // обработка запросов
                while (true)
                {
                    if (handlerSocket.Available >= 2)
                    {
                        string request = handlerSocket.GetPackage().BytesToString();
                        switch (request)
                        {
                            case "requesting launcher update":
                                logger.LogInfo(nameof(HandleUser), "updater requested launcher update");
                                fsp.UploadFile("share\\minecraft-launcher.exe");
                                break;
                            case "requesting file download":
                                var file = handlerSocket.GetPackage().BytesToString();
                                logger.LogInfo(nameof(HandleUser), $"updater requested file {file}");
                                fsp.UploadFile($"share\\{file}");
                                break;
                            default:
                                throw new Exception("unknown request: " + request);
                        }
                    }
                    else Thread.Sleep(50);
                }
            }
            // неизвестный юзер

            logger.LogWarn(nameof(HandleUser),$"invalid connection string: '{connectionString}'");
            handlerSocket.SendPackage("invalid connection string");
        }
        catch (Exception ex)
        {
            logger.LogWarn(nameof(HandleUser), ex);
        }
        finally
        {
            if (handlerSocket.Connected) handlerSocket.Shutdown(SocketShutdown.Both);
            handlerSocket.Close();
            logger.LogInfo(nameof(HandleUser), "user disconnected");
        }
    }

    static void CreateManifests()
    {
        lock (manifestLocker)
        {
            FSP.CreateManifest("share\\download_if_not_exist");
            FSP.CreateManifest("share\\sync_always");
            if(!Directory.Exists("share\\sync_and_remove"))
            {
                Directory.Create("share\\sync_and_remove");
                logger.LogInfo(nameof(CreateManifests), "can't create manifest, dir <share\\sync_and_remove> doesn't exist");
            }
            else foreach (string dir in Directory.GetDirectories("share\\sync_and_remove"))
                FSP.CreateManifest(dir);
            if(Directory.GetDirectories("share\\sync_and_remove").Length==0)
                File.WriteAllText("share\\sync_and_remove\\dirlist.dtsod", "dirs: [ ];");
            else
            {
                File.WriteAllText("share\\sync_and_remove\\dirlist.dtsod",
                    "dirs: [\""
                    + Directory.GetDirectories("share\\sync_and_remove")
                        .MergeToString("\", \"")
                        .Replace("share\\sync_and_remove\\", "")
                    + "\"];");
            }
        }
    }
}