using Akari.Provider.WaveshareUART.Users;
using System;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using WaveshareUARTFingerprintSensor;

namespace Akari.Provider.WaveshareUART
{
    public class TcpService
    {
        public FingerprintSensor FingerprintSensor => WaveshareUARTProvider.Instance.FingerprintSensor;
        public UsersManager UsersManager => WaveshareUARTProvider.Instance.UsersManager;

        private string _ip;
        private int _port;

        public TcpService()
        {

        }

        public void Start()
        {
            Console.WriteLine("Starting Tcp service...");

            InitTcp();

            Console.WriteLine($"There is {UsersManager.Count} users registered");

            FingerprintSensor.Waked += FingerprintSensor_Waked;

            FingerprintSensor.Sleep();

            Console.WriteLine("Waiting for fingerprints...");

            Thread.Sleep(-1);

            FingerprintSensor.Waked -= FingerprintSensor_Waked;
        }

        private void InitTcp()
        {
            try
            {
                _ip = File.ReadAllText(WaveshareUARTProvider.ServerIPFilePath);
                _port = int.Parse(File.ReadAllText(WaveshareUARTProvider.ServerPortFilePath));
            }
            catch (Exception e)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine(e);

                Console.WriteLine();
                Console.WriteLine($"Couldn't read setting files");
                Console.WriteLine($"Launch the program with '-c' to config the provider");

                Environment.Exit(1);
            }
        }

        private void SendAuth(User user)
        {
            using (var client = new TcpClient(_ip, _port))
            {
                var stream = client.GetStream();

                var data = Convert.FromBase64String(user.Token);

                stream.Write(data, 0, data.Length);
            }
        }

        private void FingerprintSensor_Waked(FingerprintSensor sender)
        {
            FingerprintSensor.Wake();

            if (FingerprintSensor.TryComparison1N(out var userInfo))
            {
                if (TryFindUser(userInfo.userID, out var user))
                {
                    Console.WriteLine($"{user.Name} fingerprint recognized");

                    try
                    {
                        SendAuth(user);
                    }
                    catch (Exception e)
                    {
                        var oldColor = Console.ForegroundColor;
                        Console.ForegroundColor = ConsoleColor.Red;

                        Console.WriteLine("Tried to send an auth packet but an error occured.");
                        Console.WriteLine();

                        Console.WriteLine(e);

                        Console.ForegroundColor = oldColor;
                    }
                }
                else
                {
                    Console.WriteLine($"Found unknown fingerprint with id {userInfo.userID}");
                }
            }

            FingerprintSensor.Sleep();
        }

        private bool TryFindUser(ushort userID, out User user)
        {
            ushort id = (ushort)((userID / UsersManager.RangeLength) * UsersManager.RangeLength + UsersManager.RangeStart);

            if (UsersManager[id] is User u)
            {
                user = u;

                return true;
            }

            user = default;

            return false;
        }
    }
}