using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Kinect;
using System.Drawing;

namespace Trakers.Tracking.Gestures
{
    public class GestureDetector
    {
        //Historique des positions du squelette.
        protected List<List<Joint>> history = new List<List<Joint>>();
        //protected JointCollection previousSkeleton;

        //Voici les ID des noeuds d'un squelette.
        protected int hipCenterID = 0, spineID = 1, shoulderCenterID = 2, headID = 3;
        protected int shoulderLeftID = 4, elbowLeftID = 5, wristLeftID = 6, handLeftID = 7;
        protected int shoulderRightID = 8, elbowRightID = 9, wristRightID = 10, handRightID = 11;
        protected int hipLeftID = 12, kneeLeftID = 13, ankleLeftID = 14, footLeftID = 15;
        protected int hipRightID = 16, kneeRightID = 17, ankleRightID = 18, footRightID = 19;

        //Elements nécessaires à la reconnaissance du geste :
        //Distance du parcours du geste (va dépendre de la distance de l'utilisateur).
        protected float refDistance;
        //Position de départ pour le geste.
        protected SkeletonPoint startPoint;
        //Estimation du temps que prend la gesture (en s).
        protected float gesturePeriod = 1;
        //Estimation du nombre d'indexes par seconde (framerate).
        protected int indexesPerSecond = 30;
        //Estimation du nombre de positions du squelette à vérifier dans l'historique.
        protected int indexesToCheck;// = gesturePeriod * indexesPerSecond;

        public GestureDetector()
        {
            
        }

        //Setters.
        public void setRefDistance(float _refDistance)
        {
            refDistance = _refDistance;
        }
        public void setStartPoint(SkeletonPoint _startPoint)
        {
            startPoint = _startPoint;
        }
        public void setGesturePeriod(float _gesturePeriod)
        {
            gesturePeriod = _gesturePeriod;
        }
        public void setIndexesPerSecond(int _indexesPerSecond)
        {
            indexesPerSecond = _indexesPerSecond;
        }
        public void setIndexesToCheck(int _indexesToCheck)
        {
            indexesToCheck = _indexesToCheck;
        }

        //Getters.
        public float getRefDistance()
        {
            return refDistance;
        }
        public SkeletonPoint getStartPoint()
        {
            return startPoint;
        }
        public float getGesturePeriod()
        {
            return gesturePeriod;
        }
        public int getIndexesPerSecond()
        {
            return indexesPerSecond;
        }
        public int getIndexesToCheck()
        {
            return indexesToCheck;
        } 

        //Stocke les gestes du skelette pour ~3 seconds (si on prend en compte que le framerate de la Kinect
        //est de ~30 fps.
        public void UpdateSkeletonHistory(List<Joint> latestSkeleton)
        {
            /*if (previousSkeleton == null)
                previousSkeleton = latestSkeleton;
            else if (previousSkeleton != latestSkeleton)
            {*/
                history.Add(latestSkeleton);
                /*if (history.Count > 3)
                {
                    System.Console.WriteLine(history[0][0].Position.X + " " + history[1][0].Position.X + " " + history[2][0].Position.X);
                }*/
                if (history.Count > 90)
                {
                    history.RemoveAt(0);
                }
            //}
        }

        /*public bool CheckForHandWave()
        {
            //Crée un historique de squelette local, puisque l'historique est mis à jour toutes les ~1/30 s.
            List<Skeleton> history = new List<Skeleton>(history);
            //Si il n'y a pas assez de positions dans l'historique local pour vérifier le geste.
            if (history.Count < indexesToCheck)
                return false;

            float refDistance = Math.Abs(history[0].Joints.ElementAt(spineID).Position.Y - history[0].Joints.ElementAt(hipCenterID).Position.Y);
            float startPos = history[history.Count - indexesToCheck].Joints.ElementAt(handRightID).Position.X;
            bool movedRight = false;
            for (int i = history.Count - indexesToCheck + 1; i < history.Count; i++)
            {
                // Throughout the gesture period, right hand should be above theelbow, below the head and hand should be higher than the wrist
                if (!(history[i].Joints[JointID.HandRight].Position.Y > history[i].Joints[JointID.ElbowRight].Position.Y + refDistance &&
                history[i].Joints[JointID.HandRight].Position.Y < history[i].Joints[JointID.Head].Position.Y &&
                history[i].Joints[JointID.HandRight].Position.Y > history[i].Joints[JointID.WristRight].Position.Y + refDistance / 4))
                {
                    return false;
                }
                // If the previous condition was met, check if the hand has moved to the right
                if (history[i].Joints[JointID.HandRight].Position.X >= startPos + refDistance / 2 && !movedRight)
                {
                    movedRight = true;
                }
                // If the hand did move to the right, check if it returned near the original position
                if (movedRight && history[i].Joints[JointID.HandRight].Position.X <= startPos + refDistance / 5)
                {
                    skeletonHistory.Clear();
                    return true;
                }
            }
                return false;
        }*/
    }
}