using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tobii.Research;

namespace GazeWebSocketServer
{
    class EyeTrackerClient
    {
        private IEyeTracker eyeTracker;
        private GazeDataProcessor gazeDataProcessor;

        public EyeTrackerClient()
        {
            while (eyeTracker == null)
            {
                EyeTrackerCollection eyeTrackers = EyeTrackingOperations.FindAllEyeTrackers();
                if (eyeTrackers.Count > 0)
                {
                    eyeTracker = eyeTrackers[0];
                }
            }
            gazeDataProcessor = new GazeDataProcessor();
            eyeTracker.SetGazeOutputFrequency(120f);
        }

        public void Start()
        {
            eyeTracker.GazeDataReceived += GazeDataReceivedHandler;
        }

        public void Stop()
        {
            eyeTracker.GazeDataReceived -= GazeDataReceivedHandler;
        }

        private void GazeDataReceivedHandler(object sender, GazeDataEventArgs e)
        {
            Console.WriteLine(gazeDataProcessor.Extract(e).ToString());
        }
    }
}