using PaintDotNet.Annotation.Enum;
using PaintDotNet.Base.SettingModel;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Globalization;
using System.Windows.Forms;

namespace PaintDotNet.Annotation.Label
{
    using static PaintDotNet.Base.SettingModel.LabelStyleModel;
    using PointList = List<PointF>;

    /// <summary>
    /// 标注->多边形->多边形
    /// </summary>
    public class DrawPolygon : DrawObject
    {
        /// <summary>
        /// 鼠标形状
        /// </summary>
        private static Cursor handleCursor = new Cursor(PdnResources.GetResourceStream("Cursors.AnnotationPolyHandle.cur"));
        /// <summary>
        /// 点集合
        /// </summary>
        private PointList pointArray;
        /// <summary>
        /// 标注样式信息model
        /// </summary>
        public PolygonPolygon polygonStyle;

        private RectangleF rectangleF;

        public DrawPolygon() : base()
        {
            this.objectType = DrawClass.Label;
            this.drawToolType = DrawToolType.DrawPolygon;

            pointArray = new PointList();
            Initialize();
        }

        public DrawPolygon(ISurfaceBox surfaceBox, int x1, int y1) : base()
        {
            this.objectType = DrawClass.Label;
            this.drawToolType = DrawToolType.DrawPolygon;

            polygonStyle = surfaceBox.GetLabelStyleModel().polygonPolygon;
            pointArray = new PointList();
            startPoint.X = x1;
            startPoint.Y = y1;
            pointArray.Add(new PointF(x1, y1));
            Initialize();
        }

        public DrawPolygon(ISurfaceBox surfaceBox, List<PointF> points, ParentStyleModel parentStyleModel, Object content) : base()
        {
            this.objectType = DrawClass.Label;
            this.drawToolType = DrawToolType.DrawPolygon;
            this.ISurfaceBox = surfaceBox;

            polygonStyle = (PolygonPolygon)parentStyleModel;
            pointArray = points;
            startPoint = points[points.Count - 2];
            endPoint = points[points.Count - 1];
        }

        /// <summary>
        /// Clone this instance
        /// </summary>
        public override DrawObject Clone()
        {
            DrawPolygon drawPolygon = new DrawPolygon();
            drawPolygon.objectType = DrawClass.Label;
            drawPolygon.drawToolType = DrawToolType.DrawPolygon;
            drawPolygon.ISurfaceBox = this.ISurfaceBox;
            foreach (PointF p in this.pointArray)
            {
                drawPolygon.pointArray.Add(p);
            }
            drawPolygon.polygonStyle = this.polygonStyle;
            drawPolygon.startPoint = this.startPoint;
            drawPolygon.endPoint = this.endPoint;
            FillDrawObjectFields(drawPolygon);
            return drawPolygon;
        }

        public override DrawObject Clone(ISurfaceBox surfaceBox)
        {
            DrawPolygon drawPolygon = new DrawPolygon();
            drawPolygon.objectType = DrawClass.Label;
            drawPolygon.drawToolType = DrawToolType.DrawPolygon;
            drawPolygon.ISurfaceBox = surfaceBox;
            foreach (PointF p in this.pointArray)
            {
                drawPolygon.pointArray.Add(p);
            }
            drawPolygon.startPoint = this.startPoint;
            drawPolygon.endPoint = this.endPoint;
            drawPolygon.polygonStyle = this.polygonStyle;
            FillDrawObjectFields(drawPolygon);
            return drawPolygon;
        }

        public override void Draw(Graphics g)
        {
            if (HandleCount >= 3)
            { 
                g.SmoothingMode = SmoothingMode.AntiAlias;
                Color color = Color.FromArgb(this.polygonStyle.lineColor);
                Pen pen = new Pen(color, PenWidth);
                int penWidth = this.polygonStyle.lineWidth;
                pen.DashStyle = (DashStyle)this.polygonStyle.lineStyle;
                pen.Width = penWidth;
                Color fillColor = Color.FromArgb(this.polygonStyle.fillColor);
                SolidBrush fillBrush = new SolidBrush(fillColor);

                g.FillPolygon(fillBrush, pointArray.ToArray());

                g.DrawPolygon(pen, pointArray.ToArray());
                pen.Dispose();
                fillBrush.Dispose();
            }
        }

        public void AddPoint(PointF point)
        {
            pointArray.Add(point);
        }

        public override int HandleCount
        {
            get
            {
                return pointArray.Count;
            }
        }

        /// <summary>
        /// Get handle pointscroll by 1-based number
        /// </summary>
        /// <param name="handleNumber"></param>
        /// <returns></returns>
        public override PointF GetHandle(int handleNumber)
        {
            if (handleNumber < 1)
                handleNumber = 1;

            if (handleNumber > pointArray.Count)
                handleNumber = pointArray.Count;

            return pointArray[handleNumber - 1];
        }

        public override Cursor GetHandleCursor(int handleNumber)
        {
            return handleCursor;
        }

        public override void MoveHandleTo(Point point, int handleNumber)
        {
            if (handleNumber < 1)
                handleNumber = 1;

            if (handleNumber > pointArray.Count)
                handleNumber = pointArray.Count;

            pointArray[handleNumber - 1] = point;

        }

        public override void Move(int deltaX, int deltaY)
        {
            int n = pointArray.Count;
            PointF point;

            for (int i = 0; i < n; i++)
            {
                point = new PointF(pointArray[i].X + ISurfaceBox.UnscaleScalar(deltaX), pointArray[i].Y + ISurfaceBox.UnscaleScalar(deltaY));

                pointArray[i] = point;
            }
        }

        /// <summary>
        /// Draw tracker for selected object
        /// </summary>
        /// <param name="g"></param>
        public override void DrawTracker(Graphics g)
        {
            if (!Selected)
                return;
            SolidBrush brush = new SolidBrush(Color.Black);
            for (int i = 1; i <= HandleCount; i++)
            {
                g.FillRectangle(brush, GetHandleRectangle(i));
            }
            
            brush.Dispose();

            rectangleF = GetBoundingBox();
            g.DrawRectangle(new Pen(Color.White), rectangleF.X, rectangleF.Y, rectangleF.Width, rectangleF.Height);
        }

        /// <summary>
        /// Hit test.
        /// Return value: -1 - no hit
        ///                0 - hit anywhere
        ///                > 1 - handle number
        /// </summary>
        /// <param name="pointscroll"></param>
        /// <returns></returns>
        public override int HitTest(Point point)
        {
            if (Selected)
            {
                for (int i = 1; i <= HandleCount; i++)
                {
                    if (GetHandleRectangle(i).Contains(point))
                        return i;
                }
            }

            if (PointInObject(point))
                return 0;

            return -1;
        }

        protected override bool PointInObject(Point point)
        {
            int counter = 0;
            int i;
            double xinters;
            PointF p1, p2;
            int pointCount = pointArray.Count;
            p1 = pointArray[0];
            for (i = 1; i <= pointCount; i++)
            {
                p2 = pointArray[i % pointCount];
                if (point.Y > Math.Min(p1.Y, p2.Y)//校验点的Y大于线段端点的最小Y
                    && point.Y <= Math.Max(p1.Y, p2.Y))//校验点的Y小于线段端点的最大Y
                {
                    if (point.X <= Math.Max(p1.X, p2.X))//校验点的X小于等线段端点的最大X(使用校验点的左射线判断).
                    {
                        if (p1.Y != p2.Y)//线段不平行于X轴
                        {
                            xinters = (point.Y - p1.Y) * (p2.X - p1.X) / (p2.Y - p1.Y) + p1.X;
                            if (p1.X == p2.X || point.X <= xinters)
                            {
                                counter++;
                            }
                        }
                    }

                }
                p1 = p2;
            }

            if (counter % 2 == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        public override bool IntersectsWith(Rectangle rectangle)
        {
            return rectangleF.IntersectsWith(rectangle);
        }

        public override RectangleF GetBoundingBox()
        {
            RectangleF rectangle;
            float minx = 0, maxx = 0, miny = 0, maxy = 0;
            for (int i = 0; i < pointArray.Count; i++)
            {
                if (i == 0)
                {
                    minx = maxx = pointArray[i].X;
                    miny = maxy = pointArray[i].Y;
                }
                else
                {
                    if (pointArray[i].X > maxx) maxx = pointArray[i].X;
                    if (pointArray[i].X < minx) minx = pointArray[i].X;
                    if (pointArray[i].Y > maxy) maxy = pointArray[i].Y;
                    if (pointArray[i].Y < miny) miny = pointArray[i].Y;
                }
            }
            rectangle = new RectangleF(minx, miny, maxx - minx, maxy - miny);

            return rectangle;
        }

        internal void setNextPoint(PointF p)
        {
            AddPoint(p);
            startPoint = endPoint;
            endPoint = p;
        }

        internal void setEndPoint(PointF p)
        {
            endPoint = p;
        }

        public override List<PointF> GetPoints()
        {
            return pointArray;
        }

        public override ParentStyleModel GetStyle()
        {
            return polygonStyle;
        }
    }
}