using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using OpenTK.Graphics.OpenGL;
using OpenTK;
using Toolbox.Library;
using Toolbox.Library.Rendering;
using Toolbox.Library.IO;
using LayoutBXLYT.Cafe;

namespace LayoutBXLYT
{
    public partial class LayoutViewer : LayoutControlDocked
    {
        public LayoutUndoManager UndoManger = new LayoutUndoManager();

        public List<BasePane> SelectedPanes = new List<BasePane>();

        public Camera2D Camera = new Camera2D();

        public class Camera2D
        {
            public Matrix4 ModelViewMatrix = Matrix4.Identity;
            public float Zoom = 1;
            public Vector2 Position;
        }

        private LayoutEditor ParentEditor;

        private RenderableTex backgroundTex;
        public BxlytHeader LayoutFile;
        public List<BxlytHeader> LayoutFiles = new List<BxlytHeader>();
        private Dictionary<string, STGenericTexture> Textures;

        private void glControl1_Load(object sender, EventArgs e)
        {
        }

        public void ResetCamera()
        {
            Camera = new Camera2D();
        }

        public void ResetLayout(BxlytHeader bxlyt)
        {
            LayoutFile = bxlyt;
            UpdateViewport();
        }

        public GLControl GetGLControl() => glControl1;

        public LayoutViewer(LayoutEditor editor, BxlytHeader bxlyt, Dictionary<string, STGenericTexture> textures)
        {
            InitializeComponent();

            ParentEditor = editor;

            Text = bxlyt.FileName;

            Textures = textures;
            LoadLayout(bxlyt);
        }

        public void LoadLayout(BxlytHeader bxlyt)
        {
            LayoutFile = bxlyt;
            LayoutFiles.Add(bxlyt);

            if (bxlyt.Textures.Count > 0)
            {
                var textures = bxlyt.GetTextures;
                foreach (var tex in textures)
                    if (!Textures.ContainsKey(tex.Key))
                        Textures.Add(tex.Key, tex.Value);
            }
        }

        public override void OnControlClosing()
        {
            foreach (var tex in LayoutFile.Textures)
            {
                if (Textures.ContainsKey(tex))
                {
                    Textures[tex].DisposeRenderable();
                    Textures.Remove(tex);
                }
            }
        }

        public void UpdateViewport()
        {
            glControl1.Invalidate();
        }

        private void glControl1_Paint(object sender, PaintEventArgs e)
        {
            if (!Runtime.OpenTKInitialized)
                return;

            glControl1.Context.MakeCurrent(glControl1.WindowInfo);
            OnRender();
        }

        private BxlytShader GlobalShader;
        public bool GameWindow = false;
        public bool UseOrtho => Runtime.LayoutEditor.UseOrthographicView;
        private Color BackgroundColor => Runtime.LayoutEditor.BackgroundColor;
        private void OnRender()
        {
            if (LayoutFile == null) return;

            if (!GameWindow)
            {
                if (ParentEditor != null)
                    ParentEditor.GamePreviewWindow?.UpdateViewport();
            }

            if (GameWindow)
            {
                RenderGameWindow();
                RenderScene();
            }
            else
            {
                RenderEditor();
                RenderScene();
            }
        }

        private void RenderGameWindow()
        {
            glControl1.MakeCurrent();

            int WindowWidth = (int)LayoutFile.RootPane.Width;
            int WindowHeight = (int)LayoutFile.RootPane.Height;

            GL.Viewport(0, 0, glControl1.Width, glControl1.Height);
            GL.MatrixMode(MatrixMode.Projection);
            GL.LoadIdentity();
            if (UseOrtho)
            {
                float halfW = WindowWidth, halfH = WindowHeight;
                var orthoMatrix = Matrix4.CreateOrthographic(halfW, halfH, -10000, 10000);
                GL.LoadMatrix(ref orthoMatrix);
                GL.MatrixMode(MatrixMode.Modelview);
                Camera.ModelViewMatrix = orthoMatrix;
            }
            else
            {
                var cameraPosition = new Vector3(0, 0, -600);
                var perspectiveMatrix = Matrix4.CreateTranslation(cameraPosition) * Matrix4.CreatePerspectiveFieldOfView(1.3f, WindowWidth / WindowHeight, 0.01f, 100000);
                GL.LoadMatrix(ref perspectiveMatrix);
                GL.MatrixMode(MatrixMode.Modelview);
                Camera.ModelViewMatrix = perspectiveMatrix;
            }

            GL.ClearColor(BackgroundColor);
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
        }

        private void RenderEditor()
        {
            glControl1.MakeCurrent();

            GL.Viewport(0, 0, glControl1.Width, glControl1.Height);
            GL.MatrixMode(MatrixMode.Projection);
            GL.LoadIdentity();
            if (UseOrtho)
            {
                float halfW = glControl1.Width / 2.0f, halfH = glControl1.Height / 2.0f;
                var orthoMatrix = Matrix4.CreateOrthographic(halfW, halfH, -10000, 10000);
                GL.LoadMatrix(ref orthoMatrix);
                GL.MatrixMode(MatrixMode.Modelview);
                Camera.ModelViewMatrix = orthoMatrix;
            }
            else
            {
                var cameraPosition = new Vector3(Camera.Position.X, Camera.Position.Y, -(Camera.Zoom * 500));
                var perspectiveMatrix = Matrix4.CreateTranslation(cameraPosition) * Matrix4.CreatePerspectiveFieldOfView(1.3f, glControl1.Width / glControl1.Height, 0.01f, 100000);
                GL.LoadMatrix(ref perspectiveMatrix);
                GL.MatrixMode(MatrixMode.Modelview);
                Camera.ModelViewMatrix = perspectiveMatrix;
            }

            GL.ClearColor(BackgroundColor);
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

            if (UseOrtho && !GameWindow)
            {
                GL.PushMatrix();
                GL.Scale(Camera.Zoom, Camera.Zoom, 1);
                GL.Translate(Camera.Position.X, Camera.Position.Y, 0);
            }
        }

        private void RenderScene()
        {
            //  GL.Disable(EnableCap.CullFace);
            GL.Enable(EnableCap.Blend);
            GL.Enable(EnableCap.AlphaTest);
            GL.AlphaFunc(AlphaFunction.Always, 0f);
            GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
            GL.Enable(EnableCap.ColorMaterial);
            GL.Enable(EnableCap.Texture2D);
            GL.BindTexture(TextureTarget.Texture2D, 0);
            GL.BlendEquation(BlendEquationMode.FuncAdd);

            if (!GameWindow)
            {
                DrawRootPane(LayoutFile.RootPane);
                DrawGrid();
                DrawXyLines();
            }

            GL.BindTexture(TextureTarget.Texture2D, 0);

            if (GlobalShader == null)
            {
                GlobalShader = new BxlytShader();
                GlobalShader.Compile();
            }


            bool PreviewHitbox = false;
            if (PreviewHitbox)
            {
                foreach (var file in LayoutFiles)
                {
                    foreach (var pane in file.PaneLookup.Values)
                    {
                        if (!pane.Visible || !pane.DisplayInEditor)
                            continue;

                        //Hitbox debug
                        var hitbox = pane.CreateRectangle();
                        hitbox = hitbox.GetTransformedRectangle(pane.Parent, pane.Translate, pane.Scale);

                        GL.Begin(PrimitiveType.Quads);
                        GL.Color4(Color.FromArgb(28, 255, 0, 0));
                        GL.Vertex2(hitbox.LeftPoint, hitbox.BottomPoint);
                        GL.Vertex2(hitbox.RightPoint, hitbox.BottomPoint);
                        GL.Vertex2(hitbox.RightPoint, hitbox.TopPoint);
                        GL.Vertex2(hitbox.LeftPoint, hitbox.TopPoint);
                        GL.End();
                    }
                }
            }

            foreach (var layout in LayoutFiles)
                RenderPanes(GlobalShader, layout.RootPane, true, 255, false, null, 0);

            Vector2 TopLeft = new Vector2();
            Vector2 BottomRight = new Vector2();

            foreach (var pane in SelectedPanes)
            {
                var rect = pane.CreateRectangle();
                TopLeft.X = Math.Min(TopLeft.X, rect.LeftPoint);
                TopLeft.Y = Math.Max(TopLeft.Y, rect.TopPoint);
                BottomRight.X = Math.Max(BottomRight.X, rect.RightPoint);
                BottomRight.Y = Math.Min(BottomRight.Y, rect.BottomPoint);

                if (pickAxis == PickAxis.Y)
                {
                    GL.Begin(PrimitiveType.Lines);
                    GL.Color4(Color.Green);
                    GL.Vertex2(pane.Translate.X, -999999);
                    GL.Vertex2(pane.Translate.X, 99999);
                    GL.End();
                }
                if (pickAxis == PickAxis.X)
                {
                    GL.Begin(PrimitiveType.Lines);
                    GL.Color4(Color.Red);
                    GL.Vertex2(-999999, pane.Translate.Y);
                    GL.Vertex2(99999, pane.Translate.Y);
                    GL.End();
                }
            }

            //Create a bounding box for all selected panes
            //This box will allow resizing of all selected panes
            if (SelectedPanes.Count > 0)
            {
            
            }

            if (UseOrtho)
                GL.PopMatrix();

            GL.UseProgram(0);

            glControl1.SwapBuffers();
        }

        private void DrawRectangle()
        {

        }

        private bool test = true;
        private void RenderPanes(BxlytShader shader, BasePane pane, bool isRoot, byte parentAlpha, bool parentAlphaInfluence, BasePane partPane = null, int stage = 0)
        {
            if (!pane.DisplayInEditor || !pane.animController.Visibile)
                return;

            GL.PushMatrix();

            //Check XY rotation and draw the pane before it was rotated
            bool isRotatedXY = pane.Rotate.X != 0 || pane.Rotate.Y != 0;
            if (isRotatedXY && SelectedPanes.Contains(pane))
            {
                GL.PushMatrix();
                GL.Translate(pane.Translate.X, pane.Translate.Y, 0);
                GL.Rotate(pane.Rotate.Z, 0, 0, 1);
                GL.Scale(pane.Scale.X, pane.Scale.Y, 1);

                DrawDefaultPane(shader, pane, true);

                GL.PopMatrix();
            }


            var translate = pane.Translate;
            var rotate = pane.Rotate;
            var scale = pane.Scale;

            foreach (var animItem in pane.animController.PaneSRT)
            {
                switch (animItem.Key)
                {
                    case LPATarget.RotateX: rotate.X = animItem.Value; break;
                    case LPATarget.RotateY: rotate.Y = animItem.Value; break;
                    case LPATarget.RotateZ: rotate.Z = animItem.Value; break;
                    case LPATarget.ScaleX: scale.X = animItem.Value; break;
                    case LPATarget.ScaleY: scale.Y = animItem.Value; break;
                    case LPATarget.TranslateX: translate.X = animItem.Value; break;
                    case LPATarget.TranslateY: translate.Y = animItem.Value; break;
                    case LPATarget.TranslateZ: translate.Z = animItem.Value; break;
                }
            }

            if (partPane != null)
            {
                translate = translate + pane.Translate;
                scale = scale * pane.Scale;
                rotate = rotate + pane.Rotate;
            }


            GL.Translate(translate.X, translate.Y, 0);

            //Rotate normally unless the object uses shaders/materials
            //Rotation matrix + shaders works accurately with X/Y rotation axis
            //Todo, do everything by shaders
            bool HasMaterials = pane is IWindowPane || pane is IPicturePane || pane is BFLYT.PRT1;
            if (!HasMaterials)
            {
                GL.Rotate(rotate.X, 1, 0, 0);
                GL.Rotate(rotate.Y, 0, 1, 0);
                GL.Rotate(rotate.Z, 0, 0, 1);
            }

            GL.Scale(scale.X, scale.Y, 1);

            byte alpha = pane.Alpha;
            if (pane.animController.PaneVertexColors.ContainsKey(LVCTarget.PaneAlpha))
                alpha = (byte)pane.animController.PaneVertexColors[LVCTarget.PaneAlpha];

            byte effectiveAlpha = (byte)(parentAlpha == 255 ? alpha : (alpha * parentAlpha) / 255);
            if (!parentAlphaInfluence)
                effectiveAlpha = alpha;

            parentAlphaInfluence = parentAlphaInfluence || pane.InfluenceAlpha;

            if (!isRoot)
            {
                bool isSelected = SelectedPanes.Contains(pane);

                if (pane is IPicturePane)
                    BxlytToGL.DrawPictureBox(pane, GameWindow, effectiveAlpha, Textures, isSelected);
                else if (pane is IWindowPane)
                    BxlytToGL.DrawWindowPane(pane, GameWindow, effectiveAlpha, Textures, isSelected);
                else if (pane is IBoundryPane)
                    BxlytToGL.DrawBoundryPane(pane, GameWindow, effectiveAlpha, isSelected);
                else if (pane is ITextPane && Runtime.LayoutEditor.DisplayTextPane)
                {
                    var textPane = (ITextPane)pane;
                    Bitmap bitmap = null;
                    if (textPane.RenderableFont == null)
                    {
                        if (pane is BFLYT.TXT1)
                        {
                            foreach (var fontFile in FirstPlugin.PluginRuntime.BxfntFiles)
                            {
                                if (Utils.CompareNoExtension(fontFile.Name, textPane.FontName))
                                {
                                    bitmap = fontFile.GetBitmap(textPane.Text, false, pane);
                                }
                            }
                        }
                    }
                    if (bitmap != null)
                        BxlytToGL.DrawTextbox(pane, GameWindow, bitmap, effectiveAlpha,
                            Textures, SelectedPanes, textPane.RenderableFont == null, isSelected);
                    else
                        DrawDefaultPane(shader, pane);
                }
                else if (pane is BFLYT.SCR1)
                    BxlytToGL.DrawScissorPane(pane, GameWindow, effectiveAlpha, isSelected);
                else if (pane is BFLYT.ALI1)
                    BxlytToGL.DrawAlignmentPane(pane, GameWindow, effectiveAlpha, isSelected);
                else if (pane is BFLYT.PRT1)
                    DrawPartsPane(shader, (BFLYT.PRT1)pane, effectiveAlpha, parentAlphaInfluence);
                else
                    DrawDefaultPane(shader, pane);
            }
            else
                isRoot = false;

            byte childAlpha = pane.InfluenceAlpha || parentAlphaInfluence ? effectiveAlpha : byte.MaxValue;
            foreach (var childPane in pane.Childern)
                RenderPanes(shader, childPane, isRoot, childAlpha, parentAlphaInfluence, partPane);

            GL.PopMatrix();
        }

        private void DrawRootPane(BasePane pane)
        {
            Color color = Color.Black;
            if (SelectedPanes.Contains(pane))
                color = Color.Red;

            CustomRectangle rect = pane.CreateRectangle();

            //Draw a quad which is the backcolor but lighter
            GL.Begin(PrimitiveType.Quads);
            GL.Color3(BackgroundColor.Lighten(10));
            GL.Vertex2(rect.LeftPoint, rect.TopPoint);
            GL.Vertex2(rect.RightPoint, rect.TopPoint);
            GL.Vertex2(rect.RightPoint, rect.BottomPoint);
            GL.Vertex2(rect.LeftPoint, rect.BottomPoint);
            GL.End();

            //Draw outline of root pane
            GL.Begin(PrimitiveType.LineLoop);
            GL.PolygonOffset(0.5f, 2);
            GL.LineWidth(33);
            GL.Color3(color);
            GL.Vertex2(rect.LeftPoint, rect.TopPoint);
            GL.Vertex2(rect.RightPoint, rect.TopPoint);
            GL.Vertex2(rect.RightPoint, rect.BottomPoint);
            GL.Vertex2(rect.LeftPoint, rect.BottomPoint);
            GL.End();
        }

        private void DrawDefaultPane(BxlytShader shader, BasePane pane, bool isSelectionBox = false)
        {
            if (!Runtime.LayoutEditor.DisplayNullPane && !isSelectionBox || GameWindow || Runtime.LayoutEditor.IsGamePreview)
                return;

            Vector2[] TexCoords = new Vector2[] {
                new Vector2(1,1),
                new Vector2(0,1),
                new Vector2(0,0),
                new Vector2(1,0)
                };

            Color color = Color.White;
            if (SelectedPanes.Contains(pane))
                color = Color.Red;

            Color[] Colors = new Color[] {
                color,
                color,
                color,
                color,
                };

            BxlytToGL.DrawRectangle(pane, GameWindow, pane.Rectangle, TexCoords, Colors);
        }

        private void DrawPartsPane(BxlytShader shader, BFLYT.PRT1 pane, byte effectiveAlpha, bool parentInfluenceAlpha)
        {
            pane.UpdateTextureData(this.Textures);
            var partPane = pane.GetExternalPane();
            if (partPane != null)
                RenderPanes(shader,partPane, true, effectiveAlpha, parentInfluenceAlpha);
            else
                DrawDefaultPane(shader, pane);

            if (pane.Properties != null)
            {
                foreach (var prop in pane.Properties)
                {
                    if (prop.Property != null)
                    {
                        RenderPanes(shader,prop.Property, false, effectiveAlpha, parentInfluenceAlpha || pane.InfluenceAlpha);
                    }
                }
            }
        }


        private void DrawBackground()
        {
            if (backgroundTex == null)
            {
                /*    backgroundTex = RenderableTex.FromBitmap(Properties.Resources.GridBackground);
                    backgroundTex.TextureWrapR = TextureWrapMode.Repeat;
                    backgroundTex.TextureWrapT = TextureWrapMode.Repeat;


                    GL.Enable(EnableCap.Texture2D);
                    GL.BindTexture(TextureTarget.Texture2D, backgroundTex.TexID);
                    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (float)backgroundTex.TextureWrapR);
                    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (float)backgroundTex.TextureWrapT);
                    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (float)backgroundTex.TextureMagFilter);
                    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (float)backgroundTex.TextureMinFilter);

                    float UVscale = 15;

                    int PanelWidth = 9000;
                    int PanelWHeight = 9000;

                    Vector2 scaleCenter = new Vector2(0.5f, 0.5f);

                    Vector2[] TexCoords = new Vector2[] {
                    new Vector2(1,1),
                    new Vector2(0,1),
                    new Vector2(0,0),
                    new Vector2(1,0),
                };

                    for (int i = 0; i < TexCoords.Length; i++)
                        TexCoords[i] = (TexCoords[i] - scaleCenter) * 20 + scaleCenter;

                    GL.MatrixMode(MatrixMode.Modelview);
                    GL.LoadIdentity();
                    GL.PushMatrix();
                    GL.Scale(1, 1, 1);
                    GL.Translate(0, 0, 0);

                    GL.Color4(Color.White);

                    GL.Begin(PrimitiveType.Quads);
                    GL.TexCoord2(TexCoords[0]);
                    GL.Vertex3(PanelWidth, PanelWHeight, 0);
                    GL.TexCoord2(TexCoords[1]);
                    GL.Vertex3(-PanelWidth, PanelWHeight, 0);
                    GL.TexCoord2(TexCoords[2]);
                    GL.Vertex3(-PanelWidth, -PanelWHeight, 0);
                    GL.TexCoord2(TexCoords[3]);
                    GL.Vertex3(PanelWidth, -PanelWHeight, 0);
                    GL.End();

                    GL.BindTexture(TextureTarget.Texture2D, 0);
                    GL.PopMatrix();*/
            }
        }

        public void UpdateBackgroundColor(Color color)
        {
            Runtime.LayoutEditor.BackgroundColor = color;
            glControl1.Invalidate();
            Config.Save();
        }

        private void DrawXyLines()
        {
            if (GameWindow || Runtime.LayoutEditor.IsGamePreview)
                return;

            int lineLength = 20;

            GL.Color3(Color.Green);
            GL.Begin(PrimitiveType.Lines);
            GL.Vertex2(0, 0);
            GL.Vertex2(0, lineLength);
            GL.End();

            GL.Color3(Color.Red);
            GL.Begin(PrimitiveType.Lines);
            GL.Vertex2(0, 0);
            GL.Vertex2(lineLength, 0);
            GL.End();
        }

        private void DrawGrid()
        {
            if (!Runtime.LayoutEditor.DisplayGrid)
                return;

            var size = 40;
            var amount = 300;

            GL.LineWidth(0.001f);
            GL.Color3(BackgroundColor.Darken(20));
            GL.Begin(PrimitiveType.Lines);

            int squareGridCounter = 0;
            for (var i = -amount; i <= amount; i++)
            {
                if (squareGridCounter > 5)
                {
                    squareGridCounter = 0;
                    GL.LineWidth(33f);
                }
                else
                {
                    GL.LineWidth(0.001f);
                }

                GL.Vertex2(new Vector2(-amount * size, i * size));
                GL.Vertex2(new Vector2(amount * size, i * size));
                GL.Vertex2(new Vector2(i * size, -amount * size));
                GL.Vertex2(new Vector2(i * size, amount * size));

                squareGridCounter++;
            }
            GL.End();
            GL.Color3(Color.Transparent);
            GL.PopAttrib();
        }

        private bool mouseHeldDown = false;
        private bool isPicked = false;
        private bool mouseMoving = false;
        private Point originMouse;
        private Point pickOriginMouse;
        private Point pickMouse;
        private Vector2 pickDistance;
        private PickAction pickAction = PickAction.None;
        private PickAxis pickAxis = PickAxis.All;
        private bool snapToGrid = false;

        private void glControl1_MouseDown(object sender, MouseEventArgs e)
        {
            if (GameWindow)
                return;

            pickAction = PickAction.None;
            pickAxis = PickAxis.All;

            if (Control.ModifierKeys == Keys.Shift && e.Button == MouseButtons.Left ||
               e.Button == MouseButtons.Middle)
            {
                originMouse = e.Location;
                mouseHeldDown = true;
                glControl1.Invalidate();
            }
            //Pick an object for moving
            else if (e.Button == MouseButtons.Left)
            {
                RenderEditor();
                var coords = convertScreenToWorldCoords(e.Location.X, e.Location.Y);

                bool hasEdgeHit = false;
                foreach (var pane in SelectedPanes)
                {
                    var edgePick = SearchEdgePicking(pane, coords.X, coords.Y);
                    if (edgePick != PickAction.None)
                    {
                        pickAction = edgePick;
                        isPicked = true;
                        hasEdgeHit = true;

                        UndoManger.AddToUndo(new LayoutUndoManager.UndoActionTransform(pane));

                        pickOriginMouse = e.Location;

                        RenderScene();
                        return;
                    }
                }

                BasePane hitPane = null;
                SearchHit(LayoutFile.RootPane, coords.X, coords.Y, ref hitPane);
                if (hitPane != null)
                {
                    pickAction = PickAction.Translate;

                    if (!SelectedPanes.Contains(hitPane))
                        SelectedPanes.Add(hitPane);

                    foreach (var pane in SelectedPanes)
                    {
                        var edgePick = SearchEdgePicking(pane, coords.X, coords.Y);
                        if (edgePick != PickAction.None)
                            pickAction = edgePick;

                        Console.WriteLine(pane.Name + " " + pickAction);
                    }

                    foreach (var pane in SelectedPanes)
                    {
                        UndoManger.AddToUndo(new LayoutUndoManager.UndoActionTransform(pane));
                    }

                    ParentEditor.UpdateUndo();
                    ParentEditor.UpdateHiearchyNodeSelection(hitPane);

                    isPicked = true;
                }
                else if (!hasEdgeHit)
                    SelectedPanes.Clear();

                pickOriginMouse = e.Location;

                RenderScene();
            }
     

            Console.WriteLine("SelectedPanes " + SelectedPanes.Count);
        }

        private void SearchHit(BasePane pane, int X, int Y, ref BasePane SelectedPane)
        {
            if (pane.Visible && pane.DisplayInEditor && pane.IsHit(X, Y) && pane.Name != "RootPane")
                SelectedPane = pane;
            
            foreach (var childPane in pane.Childern)
                SearchHit(childPane, X, Y, ref SelectedPane);
        }

        private PickAction SearchEdgePicking(BasePane pane, int X, int Y)
        {
            var transformed = pane.CreateRectangle().GetTransformedRectangle(pane.Parent, pane.Translate, pane.Scale);
            var leftTop = new Point(transformed.LeftPoint, transformed.TopPoint);
            var left = new Point(transformed.LeftPoint, (transformed.BottomPoint + transformed.TopPoint) / 2);
            var leftBottom = new Point(transformed.LeftPoint, transformed.BottomPoint);
            var rightTop = new Point(transformed.RightPoint, transformed.TopPoint);
            var right = new Point(transformed.RightPoint, (transformed.BottomPoint + transformed.TopPoint) / 2);
            var rightBottom = new Point(transformed.RightPoint, transformed.BottomPoint);
            var top = new Point((transformed.RightPoint + transformed.LeftPoint) / 2, transformed.TopPoint);
            var bottom = new Point((transformed.RightPoint + transformed.LeftPoint) / 2, transformed.BottomPoint);

            if ( IsEdgeHit(leftTop, X, Y)) return PickAction.DragTopLeft;
            else if (IsEdgeHit(left, X, Y)) return PickAction.DragLeft;
            else if (IsEdgeHit(leftBottom, X, Y)) return PickAction.DragBottomLeft;
            else if (IsEdgeHit(rightTop, X, Y)) return PickAction.DragTopRight;
            else if (IsEdgeHit(rightBottom, X, Y)) return PickAction.DragBottomRight;
            else if (IsEdgeHit(right, X, Y)) return PickAction.DragRight;
            else if (IsEdgeHit(top, X, Y)) return PickAction.DragTop;
            else if (IsEdgeHit(bottom, X, Y)) return PickAction.DragBottom;

            return PickAction.None;
        }

        private bool IsEdgeHit(Point point, int X, int Y, int size = 10)
        {
            if ((X > point.X - size) && (X < point.X + size) &&
                (Y > point.Y - size) && (Y < point.Y + size))
                return true;
            else
                return false;
        }

        private void glControl1_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left || e.Button == MouseButtons.Middle)
            {
                pickAxis = PickAxis.All;
                mouseHeldDown = false;
                isPicked = false;
                mouseMoving = false;
                glControl1.Invalidate();
            }
        }

        public enum PickAction
        {
            None,
            DragTopRight,
            DragTopLeft,
            DragTop,
            DragLeft,
            DragRight,
            DragBottom,
            DragBottomLeft,
            DragBottomRight,
            Translate,
            Scale,
            Rotate
        }

        public enum PickAxis
        {
            All,
            X,
            Y,
            Z,
        }

        private void glControl1_MouseMove(object sender, MouseEventArgs e)
        {
            if (GameWindow)
                return;

            if (UseOrtho)
                GL.PopMatrix();

            if (SelectedPanes.Count > 0)
            {
                RenderEditor();
                var posWorld = convertScreenToWorldCoords(e.Location.X, e.Location.Y);

                GL.PopMatrix();

                //Setup edge picking with move event
                bool isEdge = false;
                foreach (var pane in SelectedPanes)
                {
                    var pickState = SearchEdgePicking(pane, posWorld.X, posWorld.Y);
                    if (pickState != PickAction.None)
                    {
                        if (pickState == PickAction.DragTop)
                            Cursor.Current = Cursors.SizeNS;
                        if (pickState == PickAction.DragBottom)
                            Cursor.Current = Cursors.SizeNS;
                        if (pickState == PickAction.DragLeft)
                            Cursor.Current = Cursors.SizeWE;
                        if (pickState == PickAction.DragRight)
                            Cursor.Current = Cursors.SizeWE;
                        if (pickState == PickAction.DragBottomLeft)
                            Cursor.Current = Cursors.SizeNESW;
                        if (pickState == PickAction.DragBottomRight)
                            Cursor.Current = Cursors.SizeNWSE;
                        if (pickState == PickAction.DragTopLeft)
                            Cursor.Current = Cursors.SizeNWSE;
                        if (pickState == PickAction.DragTopRight)
                            Cursor.Current = Cursors.SizeNESW;

                        isEdge = true;
                    }
                }

                if (!isEdge)
                    Cursor.Current = Cursors.Default;
            }

            if (isPicked)
            {
                RenderEditor();
                var temp = e.Location;
                var curPos = convertScreenToWorldCoords(temp.X, temp.Y);
                var prevPos = convertScreenToWorldCoords(pickOriginMouse.X, pickOriginMouse.Y);
                var pickMouse = new Point((int)(prevPos.X - curPos.X), (int)(prevPos.Y - curPos.Y));

                if (pickAction == PickAction.Translate)
                {
                    foreach (var pane in SelectedPanes)
                    {
                        if (pickOriginMouse != Point.Empty)
                        {
                            float posX = pane.Translate.X;
                            float posY = pane.Translate.Y;
                            float posZ = pane.Translate.Z;

                            if (pickAxis == PickAxis.X)
                                posX = pane.Translate.X - pickMouse.X;
                            if (pickAxis == PickAxis.Y)
                                posY = pane.Translate.Y - pickMouse.Y;
                            if (pickAxis == PickAxis.All)
                            {
                                posX = pane.Translate.X - pickMouse.X;
                                posY = pane.Translate.Y - pickMouse.Y;
                            }

                            if (snapToGrid)
                            {
                                int gridCubeWidth = 16, gridCubeHeight = 16;

                                pane.Translate = new Syroot.Maths.Vector3F(
                                 (float)(Math.Round(posX / gridCubeWidth) * gridCubeWidth),
                                 (float)(Math.Round(posY / gridCubeHeight) * gridCubeHeight),
                                 posZ);
                            }
                            else
                            {
                                pane.Translate = new Syroot.Maths.Vector3F( posX, posY, posZ);
                            }
                        }
                    }
                }
                else
                {
                    //Setup edge picking with move event
                    foreach (var pane in SelectedPanes)
                        pane.TransformRectangle(pickAction, pickMouse.X, pickMouse.Y);
                }

                pickOriginMouse = temp;

                RenderScene();
            }

            if (mouseHeldDown)
            {
                var pos = new Vector2(e.Location.X - originMouse.X, e.Location.Y - originMouse.Y);
                Camera.Position.X += pos.X;
                Camera.Position.Y -= pos.Y;

                originMouse = e.Location;

                glControl1.Invalidate();
            }
        }

        public static Point convertScreenToWorldCoords(int x, int y)
        {
            int[] viewport = new int[4];
            Matrix4 modelViewMatrix, projectionMatrix;
            GL.GetFloat(GetPName.ModelviewMatrix, out modelViewMatrix);
            GL.GetFloat(GetPName.ProjectionMatrix, out projectionMatrix);
            GL.GetInteger(GetPName.Viewport, viewport);
            Vector2 mouse;
            mouse.X = x;
            mouse.Y = y;
            Vector4 vector = UnProject(ref projectionMatrix, modelViewMatrix, new Size(viewport[2], viewport[3]), mouse);
            Point coords = new Point((int)vector.X, (int)vector.Y);
            return coords;
        }
        public static Vector4 UnProject(ref Matrix4 projection, Matrix4 view, Size viewport, Vector2 mouse)
        {
            Vector4 vec;

            vec.X = (2.0f * mouse.X / (float)viewport.Width - 1);
            vec.Y = -(2.0f * mouse.Y / (float)viewport.Height - 1);
            vec.Z = 0;
            vec.W = 1.0f;

            Matrix4 viewInv = Matrix4.Invert(view);
            Matrix4 projInv = Matrix4.Invert(projection);

            Vector4.Transform(ref vec, ref projInv, out vec);
            Vector4.Transform(ref vec, ref viewInv, out vec);

            if (vec.W > float.Epsilon || vec.W < float.Epsilon)
            {
                vec.X /= vec.W;
                vec.Y /= vec.W;
                vec.Z /= vec.W;
            }

            return vec;
        }

        protected override void OnMouseWheel(MouseEventArgs e)
        {
            base.OnMouseWheel(e);
            if (UseOrtho)
            {
                if (e.Delta > 0 && Camera.Zoom > 0)
                    Camera.Zoom += 0.1f;
                if (e.Delta < 0 && Camera.Zoom < 100 && Camera.Zoom > 0.1)
                    Camera.Zoom -= 0.1f;
            }
            else
            {
                if (e.Delta > 0 && Camera.Zoom > 0.1)
                    Camera.Zoom -= 0.1f;
                if (e.Delta < 0 && Camera.Zoom < 100 && Camera.Zoom > 0)
                    Camera.Zoom += 0.1f;
            }

            glControl1.Invalidate();
        }

        private void glControl1_Resize(object sender, EventArgs e)
        {
            glControl1.Invalidate();
        }

        private void glControl1_KeyDown(object sender, KeyEventArgs e)
        {
            if (isPicked && e.KeyCode == Keys.X)
            {
                pickAxis = PickAxis.X;
                glControl1.Invalidate();
            }
            if (isPicked && e.KeyCode == Keys.Y)
            {
                pickAxis = PickAxis.Y;
                glControl1.Invalidate();
            }
            else if (e.Control && e.KeyCode == Keys.Z) // Ctrl + Z undo
            {
                UndoManger.Undo();
                ParentEditor.UpdateUndo();
                glControl1.Invalidate();
            }
            else if (e.Control && e.KeyCode == Keys.R) // Ctrl + Z undo
            {
                UndoManger.Redo();
                ParentEditor.UpdateUndo();
                glControl1.Invalidate();
            }
        }
    }
}