using SixLabors.Fonts;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.Formats.Png;
using ZXing;

namespace Crm.Core.Common.Helpers
{
    public class QRCodeHelper
    {
        public byte[] Create(string content, int width)
        {
            var writer = new ZXing.ImageSharp.BarcodeWriter<Rgba32>
            {
                Format = BarcodeFormat.QR_CODE,
                Options = new ZXing.QrCode.QrCodeEncodingOptions
                {
                    DisableECI = true,
                    CharacterSet = "UTF-8",
                    Width = width,
                    Height = width,
                    Margin = 1
                }
            };
            var image = writer.WriteAsImageSharp<Rgba32>(content);
            using (var ms = new MemoryStream())
            {
                image.Save(ms, new PngEncoder());
                return ms.ToArray();
            }
        }

        public byte[] Create(string content, int width, string bg, int x, int y)
        {
            var qrcode = Create(content, width);
            var qrcode_img = Image.Load(qrcode);
            var bg_img = Image.Load(bg);
            bg_img.Mutate(m => m.DrawImage(qrcode_img, new Point(x, y), 1));
            using (var ms = new MemoryStream())
            {
                bg_img.SaveAsPngAsync(ms);
                return ms.ToArray();
            }
        }

        /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="content"></param>
        /// <param name="width"></param>
        /// <param name="bg"></param>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <param name="title"></param>
        /// <param name="title_x">-1表示自动居中</param>
        /// <param name="title_y"></param>
        /// <returns></returns>
        public byte[] Create(string content, int width, string bg, int x, int y, string title, int title_x, int title_y)
        {
            var qrcode = Create(content, width);
            var qrcode_img = Image.Load(qrcode);
            var bg_img = Image.Load(bg);
            bg_img.Mutate(m => m.DrawImage(qrcode_img, new Point(x, y), 1));
            var fonts = new FontCollection();
            var fontFile = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot", "fonts", "SIMHEI.TTF");
            var fontFamily = fonts.Add(fontFile);
            var font = new Font(fontFamily, 14, FontStyle.Bold);
            if (title_x<0)
            {
                var fontRect = TextMeasurer.Measure(title, new TextOptions(font));
                title_x  = Convert.ToInt32(0.5*bg_img.Width) - Convert.ToInt32(0.5*fontRect.Width);
            }
            bg_img.Mutate(m => m.DrawText(title, font, Color.White, new PointF(title_x, title_y)));
            using (var ms = new MemoryStream())
            {
                bg_img.SaveAsPngAsync(ms);
                return ms.ToArray();
            }
        }

        /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="content"></param>
        /// <param name="width"></param>
        /// <param name="bg"></param>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <param name="title"></param>
        /// <param name="title_x">-1表示自动居中</param>
        /// <param name="title_y"></param>
        /// <param name="subtitle"></param>
        /// <returns></returns>
        public byte[] Create(string content, int width, string bg, int x, int y, string title, int title_x, int title_y, string subtitle)
        {
            var qrcode = Create(content, width);
            var qrcode_img = Image.Load(qrcode);
            var bg_img = Image.Load(bg);
            bg_img.Mutate(m => m.DrawImage(qrcode_img, new Point(x, y), 1));
            var fonts = new FontCollection();
            var fontFile = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot", "fonts", "SIMHEI.TTF");
            var fontFamily = fonts.Add(fontFile);
            var font = new Font(fontFamily, 14, FontStyle.Bold);
            var subtitle_x = 0;
            var subtitle_y = 0;
            if (title_x<0)
            {
                var fontRect = TextMeasurer.Measure(title, new TextOptions(font));
                title_x  = Convert.ToInt32(0.5*bg_img.Width) - Convert.ToInt32(0.5*fontRect.Width);

                var fontRect2 = TextMeasurer.Measure(subtitle, new TextOptions(font));
                subtitle_x = Convert.ToInt32(0.5*bg_img.Width) - Convert.ToInt32(0.5*fontRect2.Width);
                subtitle_y = Convert.ToInt32(fontRect.Height) + title_y + 10;
            }
            bg_img.Mutate(m => m.DrawText(title, font, Color.White, new PointF(title_x, title_y)));
            bg_img.Mutate(m => m.DrawText(subtitle, font, Color.White, new PointF(subtitle_x, subtitle_y)));
            using (var ms = new MemoryStream())
            {
                bg_img.SaveAsPngAsync(ms);
                return ms.ToArray();
            }
        }
    }
}