using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace RoboticControlApp
{
    public class ModernButton : Button
    {
        private bool isPressed = false;
        private string description;
        private Color normalColor = Color.FromArgb(245, 245, 245);
        private Color hoverColor = Color.FromArgb(230, 230, 230);
        private Color pressedColor = Color.FromArgb(0, 120, 215);
        private Color borderColor = Color.FromArgb(200, 200, 200);

        public ModernButton(string key, string desc)
        {
            description = desc;
            Text = key;
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.DoubleBuffer | ControlStyles.ResizeRedraw, true);
            FlatStyle = FlatStyle.Flat;
            FlatAppearance.BorderSize = 0;
            Font = new Font("Microsoft YaHei", 10F, FontStyle.Bold);
            BackColor = normalColor;
            ForeColor = Color.Black;
            Cursor = Cursors.Hand;
        }

        public void SetPressed(bool pressed)
        {
            isPressed = pressed;
            Invalidate();
        }

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

            // 确定颜色
            Color bgColor = isPressed ? pressedColor : (ClientRectangle.Contains(PointToClient(MousePosition)) ? hoverColor : normalColor);
            Color textColor = isPressed ? Color.White : Color.Black;

            // 绘制背景
            using (SolidBrush brush = new SolidBrush(bgColor))
            {
                g.FillRoundedRectangle(brush, ClientRectangle, 8);
            }

            // 绘制边框
            using (Pen pen = new Pen(isPressed ? pressedColor : borderColor, 1))
            {
                g.DrawRoundedRectangle(pen, new Rectangle(0, 0, Width - 1, Height - 1), 8);
            }

            // 绘制按键文本
            using (SolidBrush textBrush = new SolidBrush(textColor))
            {
                StringFormat sf = new StringFormat();
                sf.Alignment = StringAlignment.Center;
                sf.LineAlignment = StringAlignment.Center;

                Font keyFont = new Font("Microsoft YaHei", 12F, FontStyle.Bold);
                g.DrawString(Text, keyFont, textBrush, new RectangleF(0, 0, Width, Height * 0.6f), sf);

                if (!string.IsNullOrEmpty(description))
                {
                    Font descFont = new Font("Microsoft YaHei", 8F);
                    g.DrawString(description, descFont, textBrush, new RectangleF(0, Height * 0.6f, Width, Height * 0.4f), sf);
                }
            }

            // 绘制按下效果
            if (isPressed)
            {
                using (SolidBrush shadowBrush = new SolidBrush(Color.FromArgb(50, 0, 0, 0)))
                {
                    g.FillRoundedRectangle(shadowBrush, new Rectangle(2, 2, Width - 4, Height - 4), 6);
                }
            }
        }

        protected override void OnMouseEnter(EventArgs e)
        {
            base.OnMouseEnter(e);
            if (!isPressed) Invalidate();
        }

        protected override void OnMouseLeave(EventArgs e)
        {
            base.OnMouseLeave(e);
            if (!isPressed) Invalidate();
        }
    }

    // 扩展方法用于绘制圆角矩形
    public static class GraphicsExtensions
    {
        public static void FillRoundedRectangle(this Graphics graphics, Brush brush, Rectangle rect, int radius)
        {
            using (GraphicsPath path = CreateRoundedRectanglePath(rect, radius))
            {
                graphics.FillPath(brush, path);
            }
        }

        public static void DrawRoundedRectangle(this Graphics graphics, Pen pen, Rectangle rect, int radius)
        {
            using (GraphicsPath path = CreateRoundedRectanglePath(rect, radius))
            {
                graphics.DrawPath(pen, path);
            }
        }

        private static GraphicsPath CreateRoundedRectanglePath(Rectangle rect, int radius)
        {
            GraphicsPath path = new GraphicsPath();
            int diameter = radius * 2;

            path.AddArc(rect.X, rect.Y, diameter, diameter, 180, 90);
            path.AddArc(rect.Right - diameter, rect.Y, diameter, diameter, 270, 90);
            path.AddArc(rect.Right - diameter, rect.Bottom - diameter, diameter, diameter, 0, 90);
            path.AddArc(rect.X, rect.Bottom - diameter, diameter, diameter, 90, 90);
            path.CloseFigure();

            return path;
        }
    }
}