using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using bbiwarg.Recognition.Tracking;
using bbiwarg.Utility;
using bbiwarg.Input.InputHandling;

namespace bbiwarg.Recognition.FingerRecognition
{
    class FingerTracker : Tracker<Finger, TrackedFinger>
    {
        public FingerTracker(ImageSize imageSize)
            : base(imageSize)
        {
        }

        public void trackFingers(FrameData frameData) {
            trackObjects(frameData.DetectedFingers);
            frameData.TrackedFingers = getCurrentObjectsWithState(TrackingState.Tracked);
        }

        public override float calculateSimilarity(TrackedFinger trackedFinger, Finger detectedFinger)
        {
            Vector2D tip, hand;
            if (trackedFinger.shouldFingerBeReversed(detectedFinger))
            {
                tip = detectedFinger.HandPoint;
                hand = detectedFinger.TipPoint;
            }
            else
            {
                tip = detectedFinger.TipPoint;
                hand = detectedFinger.HandPoint;
            }

            float tipPointSimilarity = getPositionSimilarity(trackedFinger.TipPointPrediction, tip, Parameters.FingerTrackerMaxTipPointRelativeMove);
            float handPointSimilarity = getPositionSimilarity(trackedFinger.HandPointPrediction, hand, Parameters.FingerTrackerMaxHandPointRelativeMove);

            return tipPointSimilarity * handPointSimilarity;
        }

        protected override TrackedFinger createTrackedObject(Finger detectedObject)
        {
            return new TrackedFinger(idPool.getNextUnusedID(), detectedObject, Parameters.FingerTrackerNumFramesDetectedUntilTracked, Parameters.FingerTrackerNumFramesLostUntilDeleted);
        }
    }
}