/***************************************************
 * CircleButton 2.0  ·  Red badge with built-in number
 * Author : Gong Yuchao  (2017-08-16), rev 2025-07-17
 ***************************************************/
using Lskj.Business;
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace Lskj.Control
{
    [DefaultEvent(nameof(Click))]
    public partial class CircleButton : Button
    {
        /* ───────── 可调属性 ───────── */

        private int _radius = 18 / 2;               // 直径 18px
        [Category("布局"), Description("圆点半径(px)")]
        public int Radius
        {
            get => _radius;
            set { _radius = Math.Max(4, value); SyncSize(); }
        }

        private int _number;
        [Category("数据"), Description("角标数字(>99 显示 99)")]
        public int Number
        {
            get => _number;
            set { _number = Math.Max(0, value); Invalidate(); }
        }

        [Category("外观"), Description("普通状态图(可省略)")]
        public Image ImageNormal
        {
            get => _imgNormal;
            set { _imgNormal = value; if (!_hover) BackgroundImage = value; }
        }
        private Image _imgNormal;

        [Category("外观"), Description("悬停状态图(可省略)")]
        public Image ImageHover { get; set; }

        [Category("外观"), Description("边框颜色(透明=无)")]
        public Color BorderColor { get; set; } = Color.Transparent;

        [Category("外观"), Description("边框粗细(px)")]
        public float BorderThickness { get; set; } = 1f;

        /* ───────── 状态 ───────── */
        private bool _hover;

        /* ───────── ctor ───────── */
        public CircleButton()
        {
            SetStyle(ControlStyles.AllPaintingInWmPaint |
                     ControlStyles.UserPaint |
                     ControlStyles.OptimizedDoubleBuffer, true);

            FlatStyle = FlatStyle.Flat;
            FlatAppearance.BorderSize = 0;
            BackColor = Color.Red;
            ForeColor = Color.White;

            SyncSize();

            MouseEnter += (_, __) => SetHover(true);
            MouseLeave += (_, __) => SetHover(false);
        }

        /* ───────── 重绘 ───────── */
        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);
            UpdateRegion();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;

            // ① 画圆填充
            using (SolidBrush br = new SolidBrush(BackColor))
            {
                e.Graphics.FillEllipse(br, 0, 0, Width, Height);
            }

            // ② 画边框（可选）
            if (BorderColor.A > 0 && BorderThickness > 0)
            {
                using (Pen pen = new Pen(BorderColor, BorderThickness))
                {
                    Rectangle rc = new Rectangle(
                        (int)(BorderThickness / 2),
                        (int)(BorderThickness / 2),
                        Width - (int)BorderThickness,
                        Height - (int)BorderThickness);
                    e.Graphics.DrawEllipse(pen, rc);
                }
            }

            // ③ 绘制数字
            if (_number > 0)
            {
                string txt = _number > 99 ? "99" : _number.ToString();
                using (SolidBrush fb = new SolidBrush(ForeColor))
                using (StringFormat sf = new StringFormat
                {
                    Alignment = StringAlignment.Center,
                    LineAlignment = StringAlignment.Center
                })
                {
                    e.Graphics.DrawString(txt, Font, fb,
                        new RectangleF(0, 0, Width, Height), sf);
                }
            }
        }

        /* ───────── 私有助手 ───────── */
        private void SetHover(bool hover)
        {
            if (_hover == hover) return;
            _hover = hover;
            BackgroundImage = hover && ImageHover != null ? ImageHover : _imgNormal;
        }

        private void SyncSize()
        {
            Width = Height = _radius * 2;
            UpdateRegion();
            Invalidate();
        }

        private void UpdateRegion()
        {
            try
            {
                GraphicsPath gp = new GraphicsPath();
                gp.AddEllipse(0, 0, Width, Height);
                Region?.Dispose();
                Region = new Region(gp);
            }
            catch (Exception ex) { Debug.WriteLine(ex); }
        }

        /* 隐藏 Size（设计器防误改） */
        [EditorBrowsable(EditorBrowsableState.Never)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public new Size Size
        {
            get => base.Size;
            set => base.Size = value;
        }
        public void SetMenuNum(int num)
        {
            if (SystemInfo.Instance.DisableShowNotify || num < 1)
            {
                this.Visible = false;
                return;
            }
            this.Number = num;
            this.Visible = true;
        }
    }
}