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;
        private List<GazeCoordinateBehavior> gazeCoordinateBehaviors;

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

        public void Start(GazeCoordinateBehavior gazeCoordinateBehavior)
        {
            gazeCoordinateBehaviors.Add(gazeCoordinateBehavior);
            eyeTracker.GazeDataReceived += GazeDataReceivedHandler;
        }

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

        private void GazeDataReceivedHandler(object sender, GazeDataEventArgs e)
        {
            GazeData gazeData = gazeDataProcessor.Extract(e);
            foreach(GazeCoordinateBehavior behavior in gazeCoordinateBehaviors)
            {
                behavior.Publish(gazeData);
            }
            Console.WriteLine(gazeData.ToString());
        }
    }
}