using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace XP.Camera;

/// <summary>
/// 提供像素数据到 WPF BitmapSource 的转换工具方法。
/// </summary>
public static class PixelConverter
{
    /// <summary>
    /// 将原始像素数据转换为 WPF 的 BitmapSource 对象。
    /// 返回的 BitmapSource 已调用 Freeze()，可跨线程访问。
    /// </summary>
    public static BitmapSource ToBitmapSource(byte[] pixelData, int width, int height, string pixelFormat)
    {
        ArgumentNullException.ThrowIfNull(pixelData);
        if (width <= 0) throw new ArgumentException("Width must be a positive integer.", nameof(width));
        if (height <= 0) throw new ArgumentException("Height must be a positive integer.", nameof(height));
        ArgumentNullException.ThrowIfNull(pixelFormat);

        var (format, stride) = pixelFormat switch
        {
            "Mono8" => (PixelFormats.Gray8, width),
            "BGR8" => (PixelFormats.Bgr24, width * 3),
            "BGRA8" => (PixelFormats.Bgra32, width * 4),
            _ => throw new NotSupportedException($"Pixel format '{pixelFormat}' is not supported.")
        };

        var bitmap = BitmapSource.Create(width, height, 96, 96, format, null, pixelData, stride);
        bitmap.Freeze();
        return bitmap;
    }
}