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 System.Drawing.Drawing2D;

namespace PaintDotNet.CustomControl
{
    /// <summary>
    /// 位置导航的圆形控件
    /// </summary>
    public partial class CircleControl : UserControl
    {
        public int _position = -1;
        public List<int[]> positionMap;
        List<Pen> BtnPens = new List<Pen>();

        private GraphicsPath graphicsPath = new GraphicsPath();

        List<GraphicsPath> BtnPaths = new List<GraphicsPath>();

        public CircleControl(int radius)
        {
            SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw | ControlStyles.SupportsTransparentBackColor, true);

            InitializeComponent();
            Size = new Size(radius * 2 + 2, radius * 2 + 2);
            Paint += new PaintEventHandler(Control_Paint);
            MouseMove += new MouseEventHandler(Control_Move);
            MouseDown += new MouseEventHandler(Control_MouseDown);
            MouseUp += new MouseEventHandler(Control_MouseUp);
            MouseLeave += CircleControl_Leave;

            var smallRadius = (int)(radius * 1.1 / 2);
            var location = radius - smallRadius;
            double d = smallRadius * 2 * Math.Sin(22.5 * Math.PI / 180);
            double x1 = (smallRadius * 2 - d * 2) / 2;
            float d1 = (float)d;
            float x2 = (float)x1;

            for (int i = 0; i < 16; i++)
            {
                var path = new GraphicsPath();
                var start = 157.5f + i * 45;
                if (i < 8)
                {
                    BtnPens.Add(new Pen(Color.Black, 1));
                    path.AddPie(location, location, smallRadius * 2, smallRadius * 2, start, 45f);
                }
                else
                {
                    BtnPens.Add(new Pen(Color.Black, 1));
                    path.AddPie(0, 0, radius * 2, radius * 2, start, 45f);
                }
                BtnPaths.Add(path);
            }

            graphicsPath.AddEllipse(0, 0, radius * 2, radius * 2);

            positionMap = new List<int[]>();
            positionMap.Add(new int[] { -1, 0 });
            positionMap.Add(new int[] { -1, -1 });
            positionMap.Add(new int[] { 0, -1 });
            positionMap.Add(new int[] { 1, -1 });
            positionMap.Add(new int[] { 1, 0 });
            positionMap.Add(new int[] { 1, 1 });
            positionMap.Add(new int[] { 0, 1 });
            positionMap.Add(new int[] { -1, 1 });
        }

        private void CircleControl_Leave(object sender, EventArgs e)
        {
            InitPen();
            Refresh();
        }

        public event EventHandler mouseUp;
        public event EventHandler mouseDown;

        private void Control_MouseDown(object sender, MouseEventArgs e)
        {
            mouseDown?.Invoke(this, e);
        }

        private void Control_MouseUp(object sender, MouseEventArgs e)
        {
            mouseUp?.Invoke(this, e);
        }

        private void Control_Move(object sender, MouseEventArgs e)
        {
            InitPen();
            MoveEvent(e);
            Refresh();
        }

        private void Control_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            var current = _position;
            for (int i = 15; i > -1; i--)
            {
                if (i != current)
                    e.Graphics.DrawPath(BtnPens[i], BtnPaths[i]);
            }
            if (current > -1)
                e.Graphics.DrawPath(BtnPens[current], BtnPaths[current]);
        }

        private void InitPen()
        {
            if (_position > -1)
            {
                BtnPens[_position] = new Pen(Color.Black, 1);
            }
        }

        private void MoveEvent(MouseEventArgs e)
        {
            _position = -1;
            for (int i = 0; i < 16; i++)
            {
                if (BtnPaths[i].IsVisible(e.Location))
                {
                    BtnPens[i] = new Pen(Color.Blue, 2);
                    _position = i;
                    return;
                }
            }
        }
    }
}