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

namespace AIK.Common
{
    public class ImageUtils
    {
        /// <summary>
        /// 从文件路径加载图像（同步）
        /// </summary>
        public static BitmapImage LoadFromFile(string filePath)
        {
            var bitmap = new BitmapImage();
            using (var stream = File.OpenRead(filePath))
            {
                bitmap.BeginInit();
                bitmap.StreamSource = stream;
                bitmap.CacheOption = BitmapCacheOption.OnLoad;
                bitmap.EndInit();
            }
            return bitmap;
        }

        /// <summary>
        /// 从字节数组加载图像
        /// </summary>
        public static BitmapImage LoadFromBytes(byte[] imageData)
        {
            using (var ms = new MemoryStream(imageData))
            {
                return StreamToBitmapImage(ms);
            }
        }

        /// <summary>
        /// 从任意Stream加载图像（不负责关闭流）
        /// </summary>
        public static BitmapImage StreamToBitmapImage(Stream stream)
        {
            if (stream.CanSeek) stream.Position = 0;

            var bitmap = new BitmapImage();
            bitmap.BeginInit();
            bitmap.StreamSource = stream;
            bitmap.CacheOption = BitmapCacheOption.OnLoad;
            bitmap.EndInit();
            return bitmap;
        }

        public static BitmapImage StreamToBitmapImageFull(Stream stream)
        {
            if (stream == null) return null;
            try
            {
                if (stream.CanSeek) stream.Position = 0;
                using var memoryStream = new MemoryStream();
                stream.CopyTo(memoryStream);
                memoryStream.Position = 0;
                var bitmap = new BitmapImage();
                bitmap.BeginInit();
                bitmap.StreamSource = stream;
                bitmap.CacheOption = BitmapCacheOption.OnLoad;
                bitmap.EndInit();
                bitmap.Freeze();

                return bitmap;
            }
            catch (Exception)
            {
                return null;
            }
            
        }
    }
}