using CommonLang;
using CommonLang.Geometry;
using CommonLang.Geometry.SceneGraph2D;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;

namespace CommonFroms.SceneGraph2D.Edit
{
    //----------------------------------------------------------------------------------------------------------------------------------

    public abstract class EditorNode : DisplayNode
    {
        public bool IsPickable { get; set; }
        public bool IsSelectable { get; set; }
        public bool IsDragMoveable { get; set; }

        public bool IsSelected { get; internal set; }
        public bool IsPicked { get; internal set; }

        public EditorNode()
        {
            this.IsDragMoveable = true;
            this.IsPickable = true;
            this.IsSelectable = true;
        }

        //----------------------------------------------------------------------

        private float current_scale_from_root;
        private Vector2 current_root_point;
        /// <summary>
        /// 相对屏幕的缩放比
        /// </summary>
        public float CurrentScreenScale { get { return current_scale_from_root; } }
        /// <summary>
        /// 相对屏幕的坐标
        /// </summary>
        public Vector2 CurrentScreenPoint { get { return current_root_point; } }

        internal void VisitHUD(Graphics g)
        {
            this.current_root_point = LocalToRoot(Vector2.Zero);
            this.current_scale_from_root = LocalToRootLength(1);
            g.TranslateTransform(current_root_point.X, current_root_point.Y);
            try
            {
                OnDrawHUD(g);
            }
            finally
            {
                g.TranslateTransform(-current_root_point.X, -current_root_point.Y);
            }
        }

        protected virtual void OnDrawHUD(Graphics g) { }

        //----------------------------------------------------------------------

        protected override void OnDrawAfter(IGraphics g)
        {
            base.OnDrawAfter(g);
            var gfx = (g as Win32Graphics).gfx;
            if (IsPicked)
            {
                DrawPicked(gfx);
            }
            if (IsSelected)
            {
                DrawSelected(gfx);
            }
        }

        public Pen pen_select = new Pen(System.Drawing.Color.LightSkyBlue);
        public Pen pen_pick = new Pen(System.Drawing.Color.White);

        protected virtual void DrawPicked(Graphics g)
        {
            g.DrawEllipse(pen_pick, -4, -4, 8, 8);
        }
        protected virtual void DrawSelected(Graphics g)
        {
            pen_select.Width = 2;
            //pen_select.StartCap = LineCap.Round;
            //pen_select.DashStyle = System.Drawing.Drawing2D.DashStyle.
            g.DrawEllipse(pen_select, -4, -4, 8, 8);
        }

        //----------------------------------------------------------------------
        #region Utils

        private Vector2[] temp_pts = new Vector2[2];

        public float LocalToRootLength(float len)
        {
            temp_pts[0] = Vector2.Zero;
            temp_pts[1] = new Vector2(0, len);
            base.TransformLocalToRoot(temp_pts);
            return Vector2.Distance(temp_pts[0], temp_pts[1]);
        }
        public float RootToLocalLength(float len)
        {
            temp_pts[0] = Vector2.Zero;
            temp_pts[1] = new Vector2(0, len);
            base.TransformRootToLocal(temp_pts);
            return Vector2.Distance(temp_pts[0], temp_pts[1]);
        }

        #endregion
        //----------------------------------------------------------------------
    }

    //----------------------------------------------------------------------------------------------------------------------------------

    public abstract class EditorRectNode : EditorNode
    {
        public abstract RectangleF Bounds { get; }

        protected override void DrawSelected(Graphics g)
        {
            base.DrawSelected(g);
            var bounds = this.Bounds;
            g.DrawRectangle(pen_select, bounds.X, bounds.Y, bounds.Width, bounds.Height);
        }
        protected override void DrawPicked(Graphics g)
        {
            var bounds = this.Bounds;
            g.DrawRectangle(pen_pick, bounds.X, bounds.Y, bounds.Width, bounds.Height);
        }
        protected override bool OnHitTest(ref Vector2 localPoint)
        {
            var bounds = this.Bounds;
            return CMath.includeRectPoint2(bounds.X, bounds.Y, bounds.Width, bounds.Height, localPoint.X, localPoint.Y);
        }
    }

    //----------------------------------------------------------------------------------------------------------------------------------

    public class EditorImageNode : EditorRectNode
    {
        private Bitmap _dimg;
        private RectangleF _bounds;

        public override RectangleF Bounds
        {
            get { return _bounds; }
        }
        public Bitmap Image
        {
            get { return _dimg; }
        }

        public EditorImageNode(System.Drawing.Image src)
        {
            _dimg = ImageUtils.ImageToBitmap(src);
            _bounds = new RectangleF(-_dimg.Width / 2f, -_dimg.Height / 2f, _dimg.Width, _dimg.Height);
        }

        public bool GetPixel(int x, int y, out Color ret)
        {
            if (x >= 0 && x < _dimg.Width && y >= 0 && y < _dimg.Height)
            {
                ret = _dimg.GetPixel(x, y);
                return true;
            }
            ret = System.Drawing.Color.FromArgb(0, 0, 0, 0);
            return false;
        }

        protected override void OnDrawBegin(IGraphics g)
        {
            base.OnDrawBegin(g);
            var gfx = (g as Win32Graphics).gfx;
            gfx.DrawImage(_dimg, _bounds);
        }

        //         protected override bool OnHitTest(ref Vector2 localPoint)
        //         {
        //             Color pix;
        //             if (GetPixel(
        //                 (int)(localPoint.X - _bounds.X),
        //                 (int)(localPoint.Y - _bounds.Y),
        //                 out pix))
        //             {
        //                 return pix.A != 0;
        //             }
        //             return false;
        //         }



        public static EditorImageNode CreateImage(string file)
        {
            System.Drawing.Image image = System.Drawing.Image.FromFile(file);
            var ret = new EditorImageNode(image);
            return ret;
        }
    }

}