using Resources;
using SmartCoalApplication.Annotation.Command;
using SmartCoalApplication.Annotation.Enum;
using SmartCoalApplication.Annotation.Label;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace SmartCoalApplication.Annotation
{
    /// <summary>
    /// 通用->选择功能->需要满足可选择标注、测量、视场等功能
    /// </summary>
    public class ToolPointer : Tool
    {
        private enum SelectionMode
        {
            None,
            NetSelection,   // group selection is active
            Move,           // object(s) are moves
            Size            // object is resized
        }

        private static SelectionMode selectMode = SelectionMode.None;

        // Object which is currently resized:
        private static DrawObject resizedObject;
        private static int resizedObjectHandle;

        // Keep state about last and current pointscroll (used to move and resize objects)
        private static Point lastPoint = new Point(0, 0);
        private static Point startPoint = new Point(0, 0);

        private static CommandChangeState commandChangeState;
        private static bool wasMove;

        private static RichTextBox lab;
        //private static NumericUpDown numLab;
        private static ISurfaceBox areaNow;
        private static bool isModifyTextString = false;
        //private static bool isModifyWorkType = false;
        private static DrawObject dObject;

        public static EventHandler GetMouseLeftClickPoint;

        /// <summary>
        /// Left mouse button is pressed
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnMouseDown(ISurfaceBox drawArea, MouseEventArgs e)
        {
            areaNow = drawArea;
            if (isModifyTextString && dObject != null)
            {
                dObject.textboxMessage = lab.Text;
                drawArea.Controls.Remove(lab);
                drawArea.Refresh();
                isModifyTextString = false;
            }

            //if (isModifyWorkType && dObject != null)
            //{
            //    if(numLab.Value > 0)
            //        dObject.textboxMessage = numLab.Value.ToString();

            //    drawArea.Controls.Remove(numLab);
            //    drawArea.Refresh();
            //    isModifyWorkType = false;
            //}

            Point pointscroll = GetEventPointInArea(drawArea, e.Location);
            if(e.Button == MouseButtons.Left)
            {
                for (int i = 0; i < drawArea.GraphicsList.Count; i++)
                {
                    drawArea.GraphicsList[i].MouseDownPoint(pointscroll);
                }
            }
            commandChangeState = null;
            wasMove = false;

            selectMode = SelectionMode.None;

            // Test for resizing (only if control is selected, cursor is on the handle)
            foreach (DrawObject o in drawArea.GraphicsList.Selection)
            {
                int handleNumber = o.HitTest(pointscroll);

                if (handleNumber > 0)
                {
                    selectMode = SelectionMode.Size;

                    // keep resized object in class member
                    resizedObject = o;
                    resizedObjectHandle = handleNumber;

                    // Since we want to resize only one object, unselect all other objects
                    drawArea.GraphicsList.UnselectAll();
                    o.Selected = true;

                    commandChangeState = new CommandChangeState(drawArea.GraphicsList);

                    drawArea.GraphicsList.Dirty = true;

                    resizedObject.isHitTest = true;
                }
            }
            // Test for move (cursor is on the object)
            if (selectMode == SelectionMode.None)
            {
                int n1 = drawArea.GraphicsList.Count;
                DrawObject o = null;

                for (int i = 0; i < n1; i++)
                {
                    if (drawArea.GraphicsList[i].HitTest(pointscroll) == 0)
                    {
                        o = drawArea.GraphicsList[i];
                        break;
                    }
                }

                if (o != null)
                {
                    selectMode = SelectionMode.Move;

                    // Unselect all if Ctrl is not pressed and clicked object is not selected yet
                    if ((Control.ModifierKeys & Keys.Control) == 0 && !o.Selected)
                        drawArea.GraphicsList.UnselectAll();

                    // Select clicked object
                    o.Selected = true;

                    commandChangeState = new CommandChangeState(drawArea.GraphicsList);

                    drawArea.Cursor = Cursors.SizeAll;
                    drawArea.GraphicsList.Dirty = true;
                }
            }

            // Net selection
            if (selectMode == SelectionMode.None)
            {
                // click on background
                if ((Control.ModifierKeys & Keys.Control) == 0)
                    drawArea.GraphicsList.UnselectAll();

                selectMode = SelectionMode.NetSelection;

            }

            lastPoint.X = e.X;
            lastPoint.Y = e.Y;
            startPoint.X = e.X;
            startPoint.Y = e.Y;

            //drawArea.Capture = true;

            drawArea.Refresh();

            if (selectMode == SelectionMode.NetSelection)
            {
                drawArea.DrawRectangleFlag = true;
                drawArea.DrawRectangle = new Rectangle(0, 0, 0, 0);
                // Draw selection rectangle in initial position
                /*ControlPaint.DrawReversibleFrame(
                    drawArea.RectangleToScreen(DrawObject.GetNormalizedRectangle(startPoint, lastPoint)),
                    Color.Black,
                    FrameStyle.Dashed);*/
            }

            OnMouseDownOne(drawArea, e);
            if (e.Button == MouseButtons.Right)
            {
                int selectCount = 0;
                for (int i = 0; i < drawArea.GraphicsList.Count; i++)
                {
                    if (drawArea.GraphicsList[i].Selected)
                    {
                        selectCount++;
                        if (drawArea.GraphicsList[i].objectType == DrawClass.Measure)
                            areaNow.ToolNumber = 1;
                        else if (drawArea.GraphicsList[i].objectType == DrawClass.View)
                            areaNow.ToolNumber = 2;
                    }
                }
                if (selectCount == 0)
                    areaNow.ToolNumber = 0;
            }
        }


        /// <summary>
        /// Mouse is moved.
        /// None button is pressed, or left button is pressed.
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnMouseMove(ISurfaceBox drawArea, MouseEventArgs e)
        {
            Point pointscroll = GetEventPointInArea(drawArea, e.Location);
            Point oldPoint = lastPoint;

            wasMove = true;

            // set cursor when mouse button is not pressed
            if (e.Button == MouseButtons.None)
            {
                Cursor cursor = null;

                for (int i = 0; i < drawArea.GraphicsList.Count; i++)
                {
                    int n = drawArea.GraphicsList[i].HitTest(pointscroll);

                    if (n > 0)
                    {
                        cursor = drawArea.GraphicsList[i].GetHandleCursor(n);
                        break;
                    }
                }

                if (cursor == null)
                    cursor = Cursors.Default;

                drawArea.Cursor = cursor;
                return;
            }

            if (e.Button != MouseButtons.Left)
                return;

            /// Left button is pressed

            // Find difference between previous and current position
            int dx = e.X - lastPoint.X;
            int dy = e.Y - lastPoint.Y;

            lastPoint.X = e.X;
            lastPoint.Y = e.Y;

            // resize
            if (selectMode == SelectionMode.Size)
            {
                if (resizedObject != null)
                {
                    resizedObject.MoveHandleTo(pointscroll, resizedObjectHandle);
                    drawArea.SetDirty();
                    drawArea.Refresh();
                    drawArea.GraphicsList.Dirty = true;
                }
            }

            // move
            if (selectMode == SelectionMode.Move)
            {
                foreach (DrawObject o in drawArea.GraphicsList.Selection)
                {
                    o.Move(dx, dy);
                }

                drawArea.Cursor = Cursors.SizeAll;
                drawArea.SetDirty();
                drawArea.Refresh();
                drawArea.GraphicsList.Dirty = true;
            }

            if (selectMode == SelectionMode.NetSelection)
            {
                drawArea.DrawRectangle = DrawObject.GetNormalizedRectangle(startPoint, new Point(e.X, e.Y));
                drawArea.Refresh();
                /*// Remove old selection rectangle
                ControlPaint.DrawReversibleFrame(
                    drawArea.RectangleToScreen(DrawObject.GetNormalizedRectangle(startPoint, oldPoint)),
                    Color.Black,
                    FrameStyle.Dashed);

                // Draw new selection rectangle
                ControlPaint.DrawReversibleFrame(
                    drawArea.RectangleToScreen(DrawObject.GetNormalizedRectangle(startPoint, new Point(e.X, e.Y))),
                    Color.Black,
                    FrameStyle.Dashed);*/

                return;
            }

            OnMouseMoveOne(drawArea, e);
        }

        /// <summary>
        /// Right mouse button is released
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnMouseUp(ISurfaceBox drawArea, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                for (int i = 0; i < drawArea.GraphicsList.Count; i++)
                {
                    drawArea.GraphicsList[i].MouseUp(false);
                }
            }
            if (selectMode == SelectionMode.NetSelection)
            {
                drawArea.DrawRectangleFlag = false;

                /*// Remove old selection rectangle
                ControlPaint.DrawReversibleFrame(
                    drawArea.RectangleToScreen(DrawObject.GetNormalizedRectangle(startPoint, lastPoint)),
                    Color.Black,
                    FrameStyle.Dashed);*/

                //Point pointscroll = GetEventPointInArea(drawArea, e);
                // Make group selection
                drawArea.GraphicsList.SelectInRectangle(
                    DrawRectangle.GetNormalizedRectangle(GetEventPointInArea(drawArea, new Point(startPoint.X, startPoint.Y)),
                                                        GetEventPointInArea(drawArea, new Point(lastPoint.X, lastPoint.Y))));

                selectMode = SelectionMode.None;
            }

            if (resizedObject != null)
            {
                // after resizing
                resizedObject.Normalize();
                resizedObject.isHitTest = false;
                resizedObject = null;
            }

            drawArea.Capture = false;
            drawArea.Refresh();
            drawArea.GraphicsList.Dirty = true;

            if (commandChangeState != null && wasMove)
            {
                // Keep state after moving/resizing and add command to history
                commandChangeState.NewState(drawArea.GraphicsList);
                drawArea.AddCommandToHistory(commandChangeState);
                commandChangeState = null;
            }

            OnMouseUpOne(drawArea, e);
        }

        /// <summary>
        /// Remove selected object
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnDelKeyDown(ISurfaceBox drawArea, MouseEventArgs e)
        {
            if (drawArea != null && drawArea.GraphicsList != null && drawArea.GraphicsList.Count > 0)
            {
                for (int i = drawArea.GraphicsList.Count - 1; i >= 0 ; i--)
                {
                    if(drawArea.GraphicsList[i].Selected == true){
                        drawArea.GraphicsList.RemoveObj(drawArea.GraphicsList[i]);
                    }             
                }

                drawArea.Refresh();
            }
        }

        public static void OnMouseLeftDoubleClick(ISurfaceBox drawArea, MouseEventArgs e)
        {
            if (drawArea != null && drawArea.GraphicsList != null && drawArea.GraphicsList.Count > 0)
            {
                areaNow = drawArea;
            }


            //if (drawArea.ViewMoveOnMouseLeftDoubleClickEnable)
            //{
            if (GetMouseLeftClickPoint != null)
            {
                PointF pointscroll = drawArea.GetRulerPointInPanel(e.Location);
                GetMouseLeftClickPoint(pointscroll, null);
            }
            //}

                
        }

        private static void TextBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            TextBox textBox1 = (TextBox)sender;
            //判断按键是不是要输入的类型
            if (((int)e.KeyChar < 48 || (int)e.KeyChar > 57) && (int)e.KeyChar != 8 && (int)e.KeyChar != 46)
                e.Handled = true;

            //小数点的处理
            if ((int)e.KeyChar == 46)//小数点
            {
                if (textBox1.Text.Length <= 0)
                    e.Handled = true;   //小数点不能在第一位
                else
                {
                    float f;
                    float oldf;
                    bool b1 = false, b2 = false;
                    b1 = float.TryParse(textBox1.Text, out oldf);
                    b2 = float.TryParse(textBox1.Text + e.KeyChar.ToString(), out f);
                    if (b2 == false)
                    {
                        if (b1 == true)
                            e.Handled = true;
                        else
                            e.Handled = false;
                    }
                }
            }
        }

        private static void OnTextBoxLostFocus(object sender, EventArgs e)
        {
            if (areaNow != null && lab != null)
            {
                dObject.textboxMessage = lab.Text;
                areaNow.Controls.Remove(lab);         
                areaNow.Refresh();
                isModifyTextString = false;
            }
        }

        //private static void OnNumbericLostFocus(object sender, EventArgs e)
        //{
        //    if (areaNow != null && numLab != null)
        //    {
        //        if (numLab.Value > 0)
        //            dObject.textboxMessage = numLab.Value.ToString();

        //        areaNow.Controls.Remove(numLab);
        //        areaNow.Refresh();
        //        isModifyWorkType = false;
        //    }
        //}

        public static void OnMouseClick(ISurfaceBox surfacebox, MouseEventArgs e)
        {

        }

        public static void beginWithNewObject()
        {

        }
        
    }
}