using PaintDotNet.Annotation.Enum;
using System.Drawing;
using System.Windows.Forms;

namespace PaintDotNet.Annotation.Measure
{
    /// <summary>
    /// 测量->曲线->轨迹曲线
    /// </summary>
    public class ToolMeasureTraceCurve : ToolMeasureObject
    {
        private static int lastX;
        private static int lastY;
        private static MeasureTraceCurve newTraceCurve;
        private const int minDistance = 15 * 15;
        private static bool moved = false;
        /// <summary>
        /// Left nouse button is pressed
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnMouseDown(ISurfaceBox drawArea, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left && e.Clicks != 2)
            {
                Point p = GetEventPointInArea(drawArea, e.Location);
                newTraceCurve = new MeasureTraceCurve(drawArea, p.X, p.Y, p.X + 1, p.Y + 1);

                newTraceCurve.ISurfaceBox = drawArea;
                AddNewObject(drawArea, newTraceCurve);
                lastX = p.X;
                lastY = p.Y;
            }
            else
            {
                newTraceCurve = null;
                if (!drawArea.ContinuousDrawingMeasure())
                {
                    drawArea.ActiveTool = DrawToolType.Pointer;
                }
                OnMouseNotLeftDown(drawArea, newTraceCurve);
            }
        }

        /// <summary>
        /// Mouse move - resize new polygon
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnMouseMove(ISurfaceBox drawArea, MouseEventArgs e)
        {
            Point p = GetEventPointInArea(drawArea, e.Location);

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

            if (newTraceCurve == null)
                return;                 // precaution
            if (newTraceCurve != null)
                newTraceCurve.moved = true;
            moved = true;
            Point point = new Point(p.X, p.Y);
            int distance = (p.X - lastX) * (p.X - lastX) + (p.Y - lastY) * (p.Y - lastY);

            if (distance < minDistance)
            {
                // Distance between last two points is less than minimum -
                // move last pointscroll
                newTraceCurve.MoveHandleTo(point, newTraceCurve.HandleCount);
                drawArea.GraphicsList.Dirty = true;
            }
            else
            {
                // Add new pointscroll
                newTraceCurve.AddPoint(point);
                lastX = p.X;
                lastY = p.Y;
                drawArea.GraphicsList.Dirty = true;
            }

            drawArea.Refresh();
        }

        /// <summary>
        /// 鼠标抬起事件
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnMouseUp(ISurfaceBox drawArea, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (!moved)
                {
                    if (newTraceCurve != null)
                    {
                        for (int i = 0; i < drawArea.GraphicsList.Count; i++)
                        {
                            if (drawArea.GraphicsList[i].drawToolType == newTraceCurve.drawToolType)
                            {
                                drawArea.GraphicsList.RemoveAt(i);
                                break;
                            }
                        }
                    }
                }
                moved = false;
                if (newTraceCurve != null)
                {
                    newTraceCurve.pointChange = false;
                    newTraceCurve.mouseUpPointChange = false;
                }
                if (!drawArea.ContinuousDrawingMeasure())
                    drawArea.ActiveTool = DrawToolType.Pointer;
                OnMouseUpTwo(drawArea, e);
            }
        }

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

        }

        /// <summary>
        /// 鼠标左键双击
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnMouseLeftDoubleClick(ISurfaceBox surfacebox, MouseEventArgs e)
        {

        }

        /// <summary>
        /// 删除按键
        /// </summary>
        /// <param name="surfacebox"></param>
        /// <param name="e"></param>
        public static void OnDelKeyDown(ISurfaceBox surfacebox, MouseEventArgs e)
        {

        }

        /// <summary>
        /// 删除划痕处理&污迹处理选择区域的痕迹
        /// </summary>
        /// <param name="surfacebox"></param>
        /// <param name="e"></param>
        public static void OnDel2KeyDown(ISurfaceBox surfacebox, MouseEventArgs e)
        {

        }

        /// <summary>
        /// 清空全部时调用该方法，将可能未绘制完的对象清空
        /// </summary>
        public static void beginWithNewObject()
        {
            newTraceCurve = null;
        }
    }
}