using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows.Input;

using System.Windows;

namespace GestureControl

{

    /// <summary>

    /// Take a list of points and try to recognize a pattern

    /// </summary>

    public class SurfaceGesture : List<SurfaceGestureVector>

    {

        #region Prop

        /// <summary>

        /// Allow some variation without log a direction

        /// </summary>

        public int Precision { get; set; }

        #endregion

        #region Constructor

        /// <summary>

        /// load know patterns and generate the vector list from a list of points with a default 20 precision factor

        /// </summary>

        /// <param name="list"></param>

        public SurfaceGesture(List<SurfaceGesturePoint> list)

        {

            this.Precision = 20;

            this.Generate(list);

        }

        /// <summary>

        /// load know patterns and generate the vector list from a list of points with a precision factor

        /// </summary>

        /// <param name="list"></param>

        /// <param name="precision"></param>

        public SurfaceGesture(List<SurfaceGesturePoint> list, int precision)

        {

            this.Precision = precision;

            this.Generate(list);

        }

        #endregion

        #region GenerateVector

        /// <summary>

        /// Generate list of vector from courbe mouvements, filter with the pas value

        /// </summary>

        /// <param name="list"></param>

        /// <param name="pas"></param>

        /// <returns></returns>

        private bool GenerateCourb(List<SurfaceGesturePoint> list, int pas)

        {

            int sep = list.Count / pas;

            double count = 0; ;

            SurfaceGesturePoint past = new SurfaceGesturePoint() { X = 0, Y = 0 };

            double y = 0;

            for (int i = 0; i < list.Count - 1; i++)

            {

                if (i % pas != 0)

                {

                    count += Math.Atan(list[i + 1].Y / list[i + 1].X) - Math.Atan(list[i].Y / list[i].X);

                }

                else

                {

                    count /= pas;

                    if (count == 0 || this.GetDistancePoints(past, list[i + 1]) < 5)

                    {

                        y = list[i + 1].Y;

                        past.X = count;

                        continue;

                    }

                    if (y > list[i + 1].Y)

                    {

                        if (past.X > count)

                            this.AddDirection(SurfaceGestureVectorDirection.UPRIGHT);

                        else

                            this.AddDirection(SurfaceGestureVectorDirection.UPLEFT);

                    }

                    else

                    {

                        if (past.X > count)

                            this.AddDirection(SurfaceGestureVectorDirection.DOWNRIGHT);

                        else

                            this.AddDirection(SurfaceGestureVectorDirection.DOWNLEFT);

                    }

                    y = list[i + 1].Y;

                    past.X = count;

                }

            }

            Console.Write(this);

                return true;

                return false;

        }

        /// <summary>

        /// Get distance between two points

        /// </summary>

        /// <param name="p1"></param>

        /// <param name="p2"></param>

        /// <returns></returns>

        private int GetDistancePoints(SurfaceGesturePoint p1, SurfaceGesturePoint p2)

        {

            return (int)Math.Sqrt(Math.Pow((p2.X - p1.X), 2) + Math.Pow((p1.Y - p2.Y), 2));

        }

        /// <summary>

        /// add a direction in the vector list if past who not the same

        /// </summary>

        /// <param name="type"></param>

        private void AddDirection(SurfaceGestureVectorDirection type)

        {

            if (this.Count == 0)

            {

            }

            if (this[this.Count - 1].Direction != type)

                this.Add(new SurfaceGestureVector { Direction = type, Lenght = 42 });

        }

        /// <summary>

        /// generate list of vector

        /// </summary>

        /// <param name="list"></param>

        private void Generate(List<SurfaceGesturePoint> list)

        {

            if (list.Count < 2)

            SurfaceGestureVectorDirection lastDirection = SurfaceGestureVectorDirection.NONE;

            int lastPoint = 0;

            SurfaceGesturePoint LastChange = list[0];

            /////// TEST///////////

            if (this.GenerateCourb(list, 5) == true)

                return;

            this.Clear();

            ///////////////////////

            for (int i = 0; i < list.Count - 1; i++)

            {

                if (GetHorizontal(list[lastPoint], list[i + 1]) == SurfaceGestureVectorDirection.UP && lastDirection != SurfaceGestureVectorDirection.UP)

                {

                    this.Add(new SurfaceGestureVector { Direction = SurfaceGestureVectorDirection.UP, Lenght = (Math.Abs(LastChange.Y - list[i + 1].Y)) });

                    LastChange = list[i + 1];

                    lastDirection = SurfaceGestureVectorDirection.UP;

                }

                else if (GetHorizontal(list[lastPoint], list[i + 1]) == SurfaceGestureVectorDirection.DOWN && lastDirection != SurfaceGestureVectorDirection.DOWN)

                {

                    this.Add(new SurfaceGestureVector { Direction = SurfaceGestureVectorDirection.DOWN, Lenght = (Math.Abs(LastChange.Y - list[i + 1].Y)) });

                    LastChange = list[i + 1];

                    lastDirection = SurfaceGestureVectorDirection.DOWN;

                }

                else if (GetVertical(list[lastPoint], list[i + 1]) == SurfaceGestureVectorDirection.LEFT && lastDirection != SurfaceGestureVectorDirection.LEFT)

                {

                    this.Add(new SurfaceGestureVector { Direction = SurfaceGestureVectorDirection.LEFT, Lenght = (Math.Abs(LastChange.X - list[i + 1].X)) });

                    LastChange = list[i + 1];

                    lastDirection = SurfaceGestureVectorDirection.LEFT;

                }

                else if (GetVertical(list[lastPoint], list[i + 1]) == SurfaceGestureVectorDirection.RIGHT && lastDirection != SurfaceGestureVectorDirection.RIGHT)

                {

                    this.Add(new SurfaceGestureVector { Direction = SurfaceGestureVectorDirection.RIGHT, Lenght = (Math.Abs(LastChange.X - list[i + 1].X)) });

                    LastChange = list[i + 1];

                    lastDirection = SurfaceGestureVectorDirection.RIGHT;

                }

                ++lastPoint;

            }

        }

        private SurfaceGestureVectorDirection GetHorizontal(SurfaceGesturePoint p1, SurfaceGesturePoint p2)

        {

            if (p1.Y < p2.Y)

            {

                // go up

                if (Math.Abs(p2.Y - p1.Y) > this.Precision && Math.Abs(p2.X - p1.X) < Math.Abs(p2.Y - p1.Y))

                    return SurfaceGestureVectorDirection.DOWN;

            }

            else

            {

                // go down

                if (Math.Abs(p1.Y - p2.Y) > this.Precision && Math.Abs(p1.X - p2.X) < Math.Abs(p1.Y - p2.Y))

                    return SurfaceGestureVectorDirection.UP;

            }

            return SurfaceGestureVectorDirection.NONE;

        }

        private SurfaceGestureVectorDirection GetVertical(SurfaceGesturePoint p1, SurfaceGesturePoint p2)

        {

            if (p1.X < p2.X)

            {

                // go left

                if (Math.Abs(p2.X - p1.X) > this.Precision && Math.Abs(p2.Y - p1.Y) < Math.Abs(p2.X - p1.X))

                    return SurfaceGestureVectorDirection.RIGHT;

            }

            else

            {

                // go right

                if (Math.Abs(p1.X - p2.X) > this.Precision && Math.Abs(p1.Y - p2.Y) < Math.Abs(p1.X - p2.X))

                    return SurfaceGestureVectorDirection.LEFT;

            }

            return SurfaceGestureVectorDirection.NONE;

        }

        #endregion

        #region Override

        public override String ToString()

        {

            String ret = "";

            foreach (SurfaceGestureVector v in this)

            {

                ret += (v.Direction + ", lenght:" + v.Lenght + ", precision:" + this.Precision + "\n");

                //Console.WriteLine(v.Direction + ", lenght:" + v.Lenght + ", precision:" + this.Precision);

            }

            return ret;

        }

        #endregion

    }

}