using System;
using System.IO;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;

namespace SockChatKeepAlive {
    public static class Program {
        public const string PERSIST_FILE = "Persist.dat";
        public const string AUTH_TOKEN = "AuthToken.txt";

        public const string STORAGE_DIR_NAME = ".sochkeal";

        public static readonly ManualResetEvent ManualReset = new(false);

        public static string StorageDirectory => Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), STORAGE_DIR_NAME);

        public static async Task Main() {
            Console.WriteLine("Starting Sock Chat Keep Alive...");

            if(!Directory.Exists(StorageDirectory)) {
                Console.WriteLine("Storage directory does not exist, it will be created...");
                Directory.CreateDirectory(StorageDirectory).Attributes |= FileAttributes.Hidden;
            }

            string authTokenPath = Path.Combine(StorageDirectory, AUTH_TOKEN);
            if(!File.Exists(authTokenPath)) {
                File.WriteAllLines(authTokenPath, new[] {
                    "Misuzu",
                    "Token goes here",
                    "Futami shared url goes here"
                });
                Console.WriteLine("Auth token file not found! Configure it at:");
                Console.WriteLine(authTokenPath);
                return;
            }

            string[] getAuthInfo() { return File.ReadAllLines(authTokenPath); };

            using ManualResetEvent mre = new(false);
            bool hasCancelled = false;

            void cancelKeyPressHandler(object sender, ConsoleCancelEventArgs ev) {
                Console.CancelKeyPress -= cancelKeyPressHandler;
                hasCancelled = true;
                ev.Cancel = true;
                mre.Set();
            };
            Console.CancelKeyPress += cancelKeyPressHandler;

            if(hasCancelled) return;

            using HttpClient httpClient = new();
            httpClient.DefaultRequestHeaders.Add("Accept-Language", "en-GB,en;q=0.5");
            httpClient.DefaultRequestHeaders.Add("DNT", "1");
            httpClient.DefaultRequestHeaders.Add("User-Agent", "SockChatKeepAlive/20230319 (+https://fii.moe/beans)");

            if(hasCancelled) return;

            Console.WriteLine("Loading persistent data file...");
            using PersistentData persist = new(Path.Combine(StorageDirectory, PERSIST_FILE));

            if(hasCancelled) return;

            Console.WriteLine("Loading Futami common...");
            FutamiCommon common = await FutamiCommon.FetchAsync(httpClient, getAuthInfo()[2]);

            if(hasCancelled) return;

            Console.WriteLine("Connecting to Sock Chat server...");
            using SockChatClient client = new(common, persist, getAuthInfo);
            client.Connect();

            mre.WaitOne();
            persist.WasGracefulDisconnect = false;

            Console.WriteLine(@"Bye!");
        }
    }
}