using System;
using System.Collections.Generic;
using System.Drawing.Drawing2D;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Media;
using System.Drawing.Imaging;
using System.IO;

namespace Demo.Common.Helpers
{
    public class AvatatHelper
    {
        private static Image cameraCloseImage = null;
        public static Image CameraCloseImage
        {
            get
            {
                if (cameraCloseImage != null)
                {
                    return cameraCloseImage; 
                }
                using (var fileStream = new FileStream($@"Assets/camera_close.png", FileMode.Open, FileAccess.Read))
                {
                    using var _imageStream = new MemoryStream();
                    fileStream.CopyTo(_imageStream);
                    cameraCloseImage = Image.FromStream(_imageStream);
                }

                return cameraCloseImage;
            }
        }



        /// <summary>
        /// 获取姓名对应的圆形图片 
        /// </summary>
        /// <param name="name"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <returns></returns>
        public static Bitmap GetNickNameImage(string name, int width = 132, int height = 132)
        {
            string color = "#2B6EC0";
            if (string.IsNullOrEmpty(name))
            {
                return null;
            }
            string firstName = GetFirstTwoChars(name);
            Bitmap img = new Bitmap(width, height);
            Graphics g = Graphics.FromImage(img);

            // 启用抗锯齿
            g.SmoothingMode = SmoothingMode.AntiAlias;

            // 创建圆形路径
            GraphicsPath path = new GraphicsPath();
            path.AddEllipse(0, 0, width, height);

            // 设置裁剪区域为圆形
            g.SetClip(path);

            // 填充背景色
            System.Drawing.Brush brush = new SolidBrush(ColorTranslator.FromHtml(color));
            g.FillEllipse(brush, 0, 0, width, height);

            // 填充文字
            Font font = new Font("微软雅黑", 50);
            SizeF firstSize = g.MeasureString(firstName, font);
            g.DrawString(firstName, font, System.Drawing.Brushes.White,
                new PointF((img.Width - firstSize.Width) / 2, (img.Height - firstSize.Height) / 2));

            g.Dispose();
            path.Dispose();
            brush.Dispose();
            font.Dispose();

            return img;
        }


        public static string GetFirstTwoChars(string input)
        {
            if (string.IsNullOrEmpty(input))
                return string.Empty;
            input = input.Trim();
            return input[..Math.Min(2, input.Length)];
        }


        /// <summary>
        /// 保存图片到磁盘
        /// </summary>
        /// <param name="name"></param>
        /// <param name="targetFile"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <returns></returns>
        public static Bitmap SaveNameImage(string name, string targetFile, int width = 132, int height = 132)
        {
            Bitmap img = GetNickNameImage(name, width, height);
            img.Save(targetFile + ".png", ImageFormat.Png);
            img.Dispose();
            return img;
        }
    }
}