using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using bbiwarg.Detectors.Fingers;
using bbiwarg.Detectors.Touch;
using bbiwarg.Images;
using bbiwarg.InputProviders;
using Emgu.CV;
using Emgu.CV.Structure;

namespace bbiwarg
{
    class VideoHandle
    {
        private IInputProvider inputProvider;
        private InputFrame inputFrame;

        private int width;
        private int height;
        private DepthImage depthImage;
        private EdgeImage edgeImage;
        private TouchImage touchImage;
        private PalmImage palmImage;
        private FingerImage fingerImage;

        private FingerDetector fingerDetector;
        private TouchDetector touchDetector;

        private FingerTracker fingerTracker;
        private TouchTracker touchTracker;

        public VideoHandle(IInputProvider inputProvider) {
            this.inputProvider = inputProvider;

            //initialize trackers
            touchTracker = new TouchTracker();
            fingerTracker = new FingerTracker();
        }

        public void start() {
            inputProvider.init();
            inputProvider.start();
            inputProvider.updateFrame();
            processFrameUpdate();
        }
       
        public void stop() {
            inputProvider.stop();
        }

        public void nextFrame()
        {
            if (inputProvider.isActive())
            {
                inputProvider.releaseFrame();
                inputProvider.updateFrame();
                processFrameUpdate();
            }
            else
            {
                inputProvider.stop();
            }
        }

        public int getWidth()
        {
            return width;
        }

        public int getHeight()
        {
            return height;
        }

        public Int16 getDepthAt(int x, int y) {
            return depthImage.getDepthAt(x, y);
        }

        public float getRelativeDepth(int x, int y) {
            return depthImage.getRelativeDepth(x, y);
        }

        public bool isEdgeAt(int x, int y) {
            return edgeImage.isEdgeAt(x, y);
        }

        public FingerImageState getFingerImageStateAt(int x, int y) {
            return fingerImage.getStateAt(x, y);
        }

        public bool isPalmPointAt(int x, int y) {
            return palmImage.belongsToPalm(x, y);
        }

        public TouchImageState getTouchImageStateAt(int x, int y) {
            return touchImage.getStateAt(x, y);
        }

        private void processFrameUpdate()
        {
            //read data from inputProvider
            inputFrame = inputProvider.getInputFrame();
            width = inputFrame.getWidth();
            height = inputFrame.getHeight();

            //create depthImage
            Image<Gray, Int16> image = new Image<Gray, Int16>(width, height);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    image.Data[y, x, 0] = inputFrame.getDepthAt(x, y);
                }
            }
            depthImage = new DepthImage(width, height, image);

            //create images
            edgeImage = new EdgeImage(depthImage);
            palmImage = new PalmImage(edgeImage);
            touchImage = new TouchImage(width, height);
            fingerImage = new FingerImage(width, height);

            //detect+track fingers
            fingerDetector = new FingerDetector(depthImage, edgeImage, fingerImage);
            fingerTracker.setDetectedTouchEventsThisFrame(fingerDetector.getFingers(), fingerImage);

            //detect+track touchEvents
            touchDetector = new TouchDetector(fingerTracker.getFingers(), depthImage, touchImage);
            touchTracker.setDetectedTouchEventsThisFrame(touchDetector.getTouchEvents(), touchImage);
        }
    }
}