using System;
using System.Threading.Tasks;
using System.Threading;
using WebSocketSharp;
using WebSocketSharp.Server;
using Tobii.Research;
using TrackerBridge;
using System.Windows.Forms;
using System.Drawing;

namespace GazeWebSocketServer
{
    public class Program
    {
        private static GazeServer gazeServer;
        public static void Main(string[] args)
        {
            ConfigurationData.InitializeUnexistingWithDefaults();
            ConfigurationData config = ConfigurationData.ParseToObject();

            if (args.Length > 0 && args[0] == "-d")
            {
                Task.Run(() => SimulateGazeData(300));
            }
            else
            {
                TobiiEyeTracker tobiiEyeTracker = new TobiiEyeTracker(config.TrackerSerialNumber);
                tobiiEyeTracker.ConnectionEvent += OnConnectionEstablished;
                tobiiEyeTracker.ConnectionTimeout += OnConnectionTimeout;
                tobiiEyeTracker.GazeDataAvailable += OnGazeDataAvailable;
                tobiiEyeTracker.Connect();
            }

            gazeServer = new GazeServer(config.WebSocketPort, config.WebSocketEndpoint);
            gazeServer.Start();
            Console.ReadLine();
        }

        private static void SimulateGazeData(UInt16 frequencyHz)
        {
            TimeSpan period = new TimeSpan(Convert.ToInt64((1.0 / frequencyHz) * 10e7));
            while (true)
            {
                DateTime start = DateTime.Now;
                Point mousePosition = Control.MousePosition;
                GazeData data = new GazeData(mousePosition.X, mousePosition.Y, mousePosition.X, mousePosition.Y, 0, 0);
                if (gazeServer != null && gazeServer.isRunning)
                {
                    gazeServer.Publish(data);
                }
                TimeSpan delay = period - (DateTime.Now - start);
                Thread.Sleep(delay.Ticks >= 0 ? delay.Milliseconds : 0);
            }
        }

        private static void OnGazeDataAvailable(TobiiEyeTracker sender, GazeData data)
        {
            if (gazeServer != null && gazeServer.isRunning)
            {
                gazeServer.Publish(data);
            }
        }

        private static void OnConnectionTimeout(TobiiEyeTracker sender)
        {
            Console.WriteLine("Timeout while searching for trackers.");
        }

        private static void OnConnectionEstablished(TobiiEyeTracker sender)
        {
            Console.WriteLine($"Tracker {sender.SerialNumber} connected.");
            ConfigurationData config = ConfigurationData.ParseToObject();
            sender.SetTrackingFrequency(config.TrackerFrequency);
        }
    }
}