using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;

namespace PleoLab
{
    public class Curve
    {
        public List<Point> points;
        public Curve()
        {
            points = new List<Point>();
        }
        public Curve(Curve curve)
        {
            points = new List<Point>(curve.points);
        }

        public Curve(List<Vector2> _normalizedPoints, int _screenWidth, int _screenHeight)
        {
            points = new List<Point>();
            foreach (Vector2 normalizedPoint in _normalizedPoints)
            {
                Point screenPoint = new Point(
                    (int)(normalizedPoint.x * _screenWidth),
                    (int)(_screenHeight - normalizedPoint.y * _screenHeight));

                points.Add(screenPoint);
            }
        }

        public int Count
        {
            get
            {
                return points.Count;
            }
        }

        public Point[] ToArray()
        {
            return points.ToArray();
        }

        public Point this[int key]
        {
            get
            {
                return points[key];
            }
            set
            {
                points[key] = value;
            }
        }

        public void RemoveAt(int index)
        {
            points.RemoveAt(index);
        }

        public void Add(Point point)
        {
            points.Add(point);
        }

        public void Insert(int index, Point point)
        {
            points.Insert(index, point);
        }

        public Point First()
        {
            return points.First();
        }

        public Point Last()
        {
            return points.Last();
        }

        public void Clear()
        {
            points.Clear();
        }

        public int FindClosestPointIndex(Point _point)
        {
            int closestIndex = Int32.MaxValue;
            double minDistance = Int32.MaxValue;

            for (int i = 0; i < points.Count; ++i)
            {
                double distance = EditorUtils.GetDistance(points[i], _point);
                if (distance < minDistance)
                {
                    closestIndex = i;
                    minDistance = distance;
                }
            }
            return closestIndex;
        }
        public List<Vector2> GetNormalizedCurve(int _screenWidth, int _screenHeight)
        {
            List<Vector2> normalizedPoints = new List<Vector2>();

            foreach (Point screenPoint in points)
            {
                Vector2 normalizedPoint = new Vector2(
                    (double)screenPoint.X / (double)_screenWidth,
                    ((double)_screenHeight - (double)(screenPoint.Y)) / (double)_screenHeight);
                normalizedPoints.Add(normalizedPoint);
            }

            return normalizedPoints;
        }
        public void Sort()
        {
            points = points.OrderBy(p => p.X).ToList();
        }

        public void AddRange(IEnumerable<Point> _points)
        {
            points.AddRange(_points);
        }

        public List<Point> FindAll(Predicate<Point> _predicate)
        {
            List<Point> pointsFound = points.FindAll(_predicate);
            return pointsFound;
        }

        /// <summary>
        /// Prevents list of points from containing points with the same X value
        /// Finds points with the same X value and adds, to each duplicate, one to their X value for each duplicate
        /// </summary>
        public void PreventXDuplicates()
        {
            List<Point> pointsCopy = new List<Point>(points);
            IEnumerable<IGrouping<int,Point>> groupsByX = pointsCopy.GroupBy(point => point.X);
            points.Clear();

            foreach (IGrouping<int, Point> grp in groupsByX)
            {
                IEnumerable<Point> groupedPoints = grp.AsEnumerable();
                for (int i = 0; i < groupedPoints.Count(); i++)
                {
                    points.Add(new Point(groupedPoints.ElementAt(i).X + i,
                        groupedPoints.ElementAt(i).Y));
                }
            }
        }
    }

}