using System;

using System.Collections.Generic;

using System.Linq;

using System.Diagnostics;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Media.Animation;

using System.Windows.Navigation;

using System.Windows.Shapes;

using Microsoft.Surface;

using Microsoft.Surface.Presentation;

using Microsoft.Surface.Presentation.Controls;

using System.Windows.Ink;

using System.Threading;

using System.IO;

using System.Xml;

using System.Reflection;

using System.Xml.Linq;

namespace GestureControl

{

    public class GestureControl : ContentControl

    {

        private double angle = 0;

        public static readonly DependencyProperty GestureProperty;

        Thread inProgess;

        List<SurfaceGesture> _Gestures = new List<SurfaceGesture>();

        /// <summary>

        /// List of pattern readed in the patterns.xml

        /// </summary>

        public List<SurfaceGesturePattern> Pattern = new List<SurfaceGesturePattern>();

        public String Gesture

        {

            get { return (String)GetValue(GestureControl.GestureProperty); }

            set { SetValue(GestureControl.GestureProperty, value); }

        }

        #region GestureEvent

        public delegate void GestureRoutedEventHandler(object sender, GestureRoutedEventArgs e);

        public static readonly RoutedEvent gestureEvent = EventManager.RegisterRoutedEvent("GestureEvent", RoutingStrategy.Bubble, typeof(GestureRoutedEventHandler), typeof(GestureControl));

        public event GestureRoutedEventHandler GestureEvent

        {

            add { AddHandler(gestureEvent, value); }

            remove { RemoveHandler(gestureEvent, value); }

        }

        public delegate void RaiseGestureEventCallBack(string gesture);

        public void RaiseGestureEvent(string gesture)

        {

            if (this.Dispatcher.CheckAccess())

            {

                try

                {

                    GestureRoutedEventArgs newEventArgs = new GestureRoutedEventArgs(GestureControl.gestureEvent, gesture);

                    RaiseEvent(newEventArgs);

                }

                catch (Exception e) { }

            }

            else

            {

                this.Dispatcher.BeginInvoke(new RaiseGestureEventCallBack(RaiseGestureEvent), gesture);

            }

        }

        #endregion

        static GestureControl()

        {

            DefaultStyleKeyProperty.OverrideMetadata(typeof(GestureControl), new FrameworkPropertyMetadata(typeof(GestureControl)));

            GestureControl.GestureProperty = DependencyProperty.Register("Gesture", typeof(String), typeof(GestureControl),

                    new FrameworkPropertyMetadata("None", new PropertyChangedCallback(OnGestureChanged)));

        }

        private static void OnGestureChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)

        {

            //Debug.WriteLine("changed", "Gesture");

        }

        protected override void OnInitialized(EventArgs e)

        {

            base.OnInitialized(e);

            this.InitializeControl();

        }

        protected void InitializeControl()

        {

            base.AddHandler(SurfaceControl.PreviewContactDownEvent, new RoutedEventHandler(AreaDown));

            base.AddHandler(SurfaceInkCanvas.StrokeCollectedEvent, new RoutedEventHandler(AreaStrokeCollected));

        }

        // get angle from the first contact of the stroke

        protected void AreaDown(object source, RoutedEventArgs e)

        {

            ContactEventArgs c = (ContactEventArgs)e;

            this.angle = c.Contact.GetOrientation(this) - 270;

        }

        protected void AreaStrokeCollected(object source, RoutedEventArgs e)

        {

            try

            {

                if (inProgess == null)

                {

                    inProgess = new Thread(RunCapture);

                    inProgess.Start();

                }

                else

                {

                    inProgess.Abort();

                    inProgess = null;

                    inProgess = new Thread(RunCapture);

                    inProgess.Start();

                }

                Debug.WriteLine("collected", "Stroke");

                System.Windows.Controls.InkCanvasStrokeCollectedEventArgs tmp = e as System.Windows.Controls.InkCanvasStrokeCollectedEventArgs;

                // Apply a rotation with the angle of the first contact

                Matrix rot = Matrix.Identity;

                rot.Rotate(-this.angle);

                Stroke s = tmp.Stroke;

                s.Transform(rot, true);

                // Get a list of point from a Bezier curve

                StylusPointCollection tmp2 = s.GetBezierStylusPoints();

                // Generate a list of SurfaceGesturePoint, just X and Y but can be improve

                List<SurfaceGesturePoint> pointList = new List<SurfaceGesturePoint>();

                foreach (StylusPoint p in tmp2)

                    pointList.Add(new SurfaceGesturePoint { X = p.X, Y = p.Y });

                // create the gesture analyser and set the list

                SurfaceGesture gesture = new SurfaceGesture(pointList, 1);

                // try to get a pattern from the list, if one, raise a event

                _Gestures.Add(gesture);

                SurfaceInkCanvas ink = e.OriginalSource as SurfaceInkCanvas;

                ink.Strokes.Clear();

            }

            catch { }

        }

        void RunCapture()

        {

            try

            {

                Thread.Sleep(1000);

                CommonPattern();

                string gesture = GetPattern(_Gestures);

                if (gesture != "None")

                {

                    this.RaiseGestureEvent(gesture);

                }

                _Gestures.Clear();

                inProgess = null;

            }

            catch (Exception)

            {

                inProgess = null;

            }

        }

        #region Pattern

        /// <ary>

        /// return a String with the recognized pattern, "None" if no pattern

        /// </summary>

        /// <returns></returns>

        public String GetPattern(List<SurfaceGesture> gestures)

        {            

            int found = 0;

            List<SurfaceGesture> tmp = new List<SurfaceGesture>();

            foreach (SurfaceGesturePattern p in Pattern)

            {

                if (p.Count == gestures.Count)

                {

                    int index = 0;

                    for (index = 0; index < p.Count; index++)

                    {

                        if (p[index].Count == gestures[index].Count)

                        {

                            int i;

                            for (i = 0; i < p[index].Count; i++)

                            {

                                if (gestures[index][i].Direction != p[index][i].Direction)

                                    i = p[index].Count + 1;

                            }

                            if (i == p[index].Count)

                                found++;

                        }

                    }

                    if (found == p.Count)

                        return p.Name;

                }

            }

            return "None";

        }

        /// <summary>

        /// Load know patterns from the Resources/Patterns.xml file

        /// </summary>

        private void CommonPattern()

        {

            try

            {

                #region Load Patterns

                Pattern.Clear();

                System.IO.Stream file = Assembly.GetExecutingAssembly().GetManifestResourceStream("GestureControl.Resources.Patterns.xml");

                XmlDocument xml = new XmlDocument();

                xml.Load(file);

                XmlElement root = xml.DocumentElement;

                XmlNodeList nodes = root.SelectNodes("//Pattern");

                SurfaceGesturePattern item;

                foreach (XmlNode nod in nodes)

                {

                    string name = nod["Name"].InnerText;

                    if (nod.ChildNodes.Count < 2)

                        continue;

                    item = new SurfaceGesturePattern() { Name = name };

                    List<XmlNode> childs = new List<XmlNode>();

                    foreach (XmlNode elt in nod.ChildNodes)

                        if (elt.Name.Equals("Childs"))

                            foreach (XmlNode c in elt.ChildNodes)

                                childs.Add(c);

                    SurfaceGesturePatternItem p;

                    int j = 0;

                    foreach (XmlNode node in childs)

                    {

                        string childname = node["Name"].InnerText;

                        List<XmlNode> subNodes = new List<XmlNode>();

                        foreach (XmlNode elt in node.ChildNodes)

                            if (elt.Name.Equals("Directions"))

                                foreach (XmlNode c in elt.ChildNodes)

                                    subNodes.Add(c);

                        if (subNodes.Count == 0)

                            continue;

                        p = new SurfaceGesturePatternItem() { Name = childname };

                        foreach (XmlNode subNode in subNodes)

                        {

                            switch (subNode.InnerText)

                            {

                                case "Up":

                                    p.Add(new SurfaceGestureVector() { Direction = SurfaceGestureVectorDirection.UP });

                                    break;

                                case "Down":

                                    p.Add(new SurfaceGestureVector() { Direction = SurfaceGestureVectorDirection.DOWN });

                                    break;

                                case "Left":

                                    p.Add(new SurfaceGestureVector() { Direction = SurfaceGestureVectorDirection.LEFT });

                                    break;

                                case "Right":

                                    p.Add(new SurfaceGestureVector() { Direction = SurfaceGestureVectorDirection.RIGHT });

                                    break;

                                case "DownRight":

                                    p.Add(new SurfaceGestureVector() { Direction = SurfaceGestureVectorDirection.DOWNRIGHT });

                                    break;

                                case "DownLeft":

                                    p.Add(new SurfaceGestureVector() { Direction = SurfaceGestureVectorDirection.DOWNLEFT });

                                    break;

                                case "UpRight":

                                    p.Add(new SurfaceGestureVector() { Direction = SurfaceGestureVectorDirection.UPRIGHT });

                                    break;

                                case "UpLeft":

                                    p.Add(new SurfaceGestureVector() { Direction = SurfaceGestureVectorDirection.UPLEFT });

                                    break;

                                default:

                                    break;

                            }

                        }

                        item.Add(p);

                    }

                    this.Pattern.Add(item);

                }

                #endregion

            }

            catch

            {

                throw new Exception("Error loading Patterns.xml");

            }

        }

        #endregion

    }

}