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 PointList = List<PointF>;

    /// <summary>
    /// 标注->曲线->折线
    /// </summary>
    public class DrawPolygonLine : DrawObject
    {
        /// <summary>
        /// 鼠标形状
        /// </summary>
        private static Cursor handleCursor = new Cursor(PdnResources.GetResourceStream("Cursors.AnnotationPolyHandle.cur"));
        /// <summary>
        /// 点集合
        /// </summary>
        public PointList pointArray;

        /// <summary>
        ///  Graphic objects for hit test
        /// </summary>
        private GraphicsPath areaPath = null;
        private Pen areaPen = null;
        private Region areaRegion = null;

        /// <summary>
        /// 标注样式信息model
        /// </summary>
        private LabelStyleModel.Polyline labelPolylineStyleModel;

        public LabelStyleModel.Polyline LabelPolylineStyleModel
        {
            set
            {
                this.labelPolylineStyleModel = value;
            }
        }

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

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

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

            labelPolylineStyleModel = surfaceBox.GetLabelStyleModel().polylineModel;
            pointArray = new PointList();
            startPoint.X = x1;
            startPoint.Y = y1;
            endPoint.X = x1 + 1;
            endPoint.Y = y1 + 1;
            pointArray.Add(new PointF(x1, y1));
            pointArray.Add(new PointF(x1 + 1, y1 + 1));
            Initialize();
        }

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

            labelPolylineStyleModel = (LabelStyleModel.Polyline)parentStyleModel;
            pointArray = points;
            startPoint = points[points.Count - 2];
            endPoint = points[points.Count - 1];
        }

        /// <summary>
        /// Clone this instance
        /// </summary>
        public override DrawObject Clone()
        {
            DrawPolygonLine drawPolygon = new DrawPolygonLine(ISurfaceBox, 0, 0);
            drawPolygon.objectType = DrawClass.Label;
            drawPolygon.drawToolType = DrawToolType.DrawPolygonLine;
            drawPolygon.ISurfaceBox = this.ISurfaceBox;
            drawPolygon.pointArray.Clear();
            foreach (PointF p in this.pointArray)
            {
                drawPolygon.pointArray.Add(p);
            }
            drawPolygon.startPoint = this.startPoint;
            drawPolygon.endPoint = this.endPoint;
            drawPolygon.labelPolylineStyleModel = this.labelPolylineStyleModel;
            FillDrawObjectFields(drawPolygon);
            return drawPolygon;
        }

        public override DrawObject Clone(ISurfaceBox surfaceBox)
        {
            DrawPolygonLine drawPolygon = new DrawPolygonLine(surfaceBox, 0, 0);
            drawPolygon.objectType = DrawClass.Label;
            drawPolygon.drawToolType = DrawToolType.DrawPolygonLine;
            drawPolygon.ISurfaceBox = surfaceBox;
            drawPolygon.pointArray.Clear();
            foreach (PointF p in this.pointArray)
            {
                drawPolygon.pointArray.Add(p);
            }
            drawPolygon.startPoint = this.startPoint;
            drawPolygon.endPoint = this.endPoint;
            drawPolygon.labelPolylineStyleModel = this.labelPolylineStyleModel;
            FillDrawObjectFields(drawPolygon);
            return drawPolygon;
        }

        public override void Draw(Graphics g)
        {
            /**
            int x1 = 0, y1 = 0;     // previous pointscroll
            int x2, y2;             // current pointscroll

            g.SmoothingMode = SmoothingMode.AntiAlias;

            Pen pen = new Pen(Color, PenWidth);

            PointEnumerator enumerator = pointArray.GetEnumerator();

            if (enumerator.MoveNext())
            {
                x1 = ((Point)enumerator.Current).X;
                y1 = ((Point)enumerator.Current).Y;
            }

            while (enumerator.MoveNext())
            {
                x2 = ((Point)enumerator.Current).X;
                y2 = ((Point)enumerator.Current).Y;

                g.DrawLine(pen, x1, y1, x2, y2);

                x1 = x2;
                y1 = y2;
            }

            pen.Dispose();
            **/
            if (HandleCount >= 2)
            {
                g.SmoothingMode = SmoothingMode.AntiAlias;
                Color color = Color.FromArgb(labelPolylineStyleModel.lineColor);
                int lineWidth = labelPolylineStyleModel.lineWidth;

                Pen pen = new Pen(color, lineWidth);
                pen.DashStyle = (DashStyle)this.labelPolylineStyleModel.lineStyle;
                g.DrawLines(pen, pointArray.ToArray()); //.DrawLine(pen, startPoint.X, startPoint.Y, endPoint.X, endPoint.Y);
                pen.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;

            Invalidate();
        }

        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;
            }

            Invalidate();
        }

        /// <summary>
        /// 用于创建一个路径或者是闭合的范围
        /// 用于响应点击选中
        /// 需要咨询用户是仅点击线还是矩形选择
        /// </summary>
        protected virtual void CreateObjects()
        {
            if (AreaPath != null)
                return;

            AreaPath = new GraphicsPath();
            AreaPath.AddRectangle(GetBoundingBox());
            AreaPath.CloseFigure();
            AreaRegion = new Region(AreaPath);
        }

        /// <summary>
        /// Invalidate object.
        /// When object is invalidated, path used for hit test
        /// is released and should be created again.
        /// </summary>
        protected void Invalidate()
        {
            if (AreaPath != null)
            {
                AreaPath.Dispose();
                AreaPath = null;
            }

            if (AreaPen != null)
            {
                AreaPen.Dispose();
                AreaPen = null;
            }

            if (AreaRegion != null)
            {
                AreaRegion.Dispose();
                AreaRegion = null;
            }
        }
        protected GraphicsPath AreaPath
        {
            get
            {
                return areaPath;
            }
            set
            {
                areaPath = value;
            }
        }

        protected Pen AreaPen
        {
            get
            {
                return areaPen;
            }
            set
            {
                areaPen = value;
            }
        }

        protected Region AreaRegion
        {
            get
            {
                return areaRegion;
            }
            set
            {
                areaRegion = value;
            }
        }

        /// <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.FromArgb(MarkpointAreaColor));
            Pen pen = new Pen(Color.FromArgb(MarkpointLineColor), MarkpointLineWidth);
            for (int i = 1; i <= HandleCount; i++)
            {
                switch (MarkpointStyle)
                {
                    case 0:
                        g.FillRectangle(brush, GetHandleRectangle(i));
                        g.DrawRectangle(pen, GetHandleRectangle(i));
                        break;
                    case 1:
                        g.FillEllipse(brush, GetHandleRectangle(i));
                        g.DrawEllipse(pen, GetHandleRectangle(i));
                        break;
                    case 2:
                        g.FillPolygon(brush, GetHandlePoint(i));
                        g.DrawPolygon(pen, GetHandlePoint(i));
                        break;
                }
            }
            brush.Dispose();
            pen.Dispose();

            RectangleF 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)
        {
            CreateObjects();

            return AreaRegion.IsVisible(point);
        }

        public override bool IntersectsWith(Rectangle rectangle)
        {
            CreateObjects();

            return AreaRegion.IsVisible(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 labelPolylineStyleModel;
        }
    }
}