using System;
using 常用工具集.Base;
using Avalonia.Media.Imaging;
using SkiaSharp;
using Ursa.Controls;
using Avalonia.Platform.Storage;
using System.Linq;
using System.IO;
using ImageMagick;
using static System.Runtime.InteropServices.JavaScript.JSType;

namespace 常用工具集.ViewModel._03图片相关
{
    public class 图片转ICOViewModel : ViewModelBase
    {
        public string ImagePath { get; set; }

        public Bitmap ImageSource { get; set; }

        public DelegateCommand SelectImageCmd { get; set; }

        public DelegateCommand ExportCmd { get; set; }

        public 图片转ICOViewModel()
        {
            SelectImageCmd = new DelegateCommand(SelectImageCmdFunc);
            ExportCmd = new DelegateCommand(ExportCmdFunc);
        }

        private async void SelectImageCmdFunc(object obj)
        {

            var sp = GlobalValues.StorageProvider;
            if (sp is null) return;
            FilePickerOpenOptions options = new FilePickerOpenOptions();
            options.Title = "选择图片";
            options.AllowMultiple = false;
            options.FileTypeFilter = [FilePickerFileTypes.ImageAll];
            var result = await sp.OpenFilePickerAsync(options);
            if (result == null || result.Count == 0) return;
            ImagePath = result.FirstOrDefault()?.Path.LocalPath;
            ImageSource = new Bitmap(ImagePath);
        }

        private async void ExportCmdFunc(object obj)
        {
            int size = Convert.ToInt32(obj);
            SKBitmap sbitmap = SKBitmap.Decode(ImagePath);
            SKBitmap bitmap = ResizeImage(sbitmap, size, size);
            //Icon icon = ConvertToIcon(bitmap);
            //IconDir icon = new IconDir();
            //icon.AddImage(bitmap, bitmap.Width, bitmap.Height);


            var sp = GlobalValues.StorageProvider;
            if (sp is null) return;
            var result = await sp.OpenFolderPickerAsync(new FolderPickerOpenOptions()
            {
                Title = "请选择要生成的目录",
                AllowMultiple = false,
            });
            if (result == null || result.Count == 0)
            {
                await MessageBox.ShowAsync("文件夹路径不能为空");
                return;
            }
            string filePath = result.FirstOrDefault()?.Path.LocalPath;
            if (!filePath.EndsWith("/"))
            {
                filePath += "/";
            }
            string fileName = "favicon_" + size + "_" + DateTime.Now.ToString("yyyyMMddHHmmss");
            byte[] bytes = null;
            using (MemoryStream stream = new MemoryStream())
            {
                SKData data = bitmap.Encode(SKEncodedImageFormat.Png, 100);
                data.SaveTo(stream);
                bytes = stream.ToArray();
            }
            using (MemoryStream stream = new MemoryStream(bytes))
            {
                using (MagickImage image = new MagickImage(stream))
                {
                    image.Format = MagickFormat.Ico;
                    image.Write(filePath + fileName + ".ico");
                }
            }
            await MessageBox.ShowAsync("生成成功");
            //icon.Dispose();
            bitmap.Dispose();
            sbitmap.Dispose();
        }


        /// <summary>
        /// 图片缩放
        /// </summary>
        /// <param name="bmp"></param>
        /// <param name="newW"></param>
        /// <param name="newH"></param>
        /// <returns></returns>
        public static SKBitmap ResizeImage(SKBitmap bmp, int newW, int newH)
        {
            try
            {
                SKBitmap b = new SKBitmap(newW, newH, SKColorType.Argb4444, SKAlphaType.Opaque);
                SKCanvas g = new SKCanvas(b);
                g.DrawBitmap(bmp, new SKRect(0, 0, newW, newH));
                g.Dispose();
                return b;
            }
            catch
            {
                return null;
            }
        }
    }
}