XFESystem

using System.Text;

namespace XFESystem.Browser.Tests;

public sealed class SvgReferenceTests
{
    [Fact]
    public void LocalSymbolsUseInheritedColorTranslationAndTheSamePixelsAsFlattenedGeometry()
    {
        string svg = "<svg xmlns='http://www.w3.org/2000/svg' width='20' height='20' color='red'><defs><symbol id='shape'><path fill='currentColor' d='M1 1H9V9H1Z'/></symbol></defs><use href='#shape' x='2' y='3'/></svg>";
        string flat = "<svg xmlns='http://www.w3.org/2000/svg' width='20' height='20'><path fill='red' d='M3 4H11V12H3Z'/></svg>";
        Assert.Equal(BrowserSvgRasterizer.Decode(Encoding.UTF8.GetBytes(flat), 400).Pixels.ToArray(), BrowserSvgRasterizer.Decode(Encoding.UTF8.GetBytes(svg), 400).Pixels.ToArray());
    }
    [Theory]
    [InlineData("<use href='https://must-not-fetch.test/shape.svg#x'/>", false)]
    [InlineData("<defs><g id='x'><use href='#x'/></g></defs><use href='#x'/>", true)]
    public void ExternalReferencesAndLocalCyclesFailWithinExplicitBounds(string body, bool cycle)
    {
        byte[] data = Encoding.UTF8.GetBytes("<svg xmlns='http://www.w3.org/2000/svg' width='20' height='20'>" + body + "</svg>");
        if (cycle) Assert.Throws<BrowserLimitException>(() => BrowserSvgRasterizer.Decode(data, 400));
        else Assert.Throws<NotSupportedException>(() => BrowserSvgRasterizer.Decode(data, 400));
    }
    [Fact]
    public void InlineUseFreezesASymbolFromAnotherSvgIntoItsOwnImage()
    {
        var page = new BrowserService();
        try
        {
            page.Navigate("about:Start");
            page.ExecuteJavaScript("document.body.innerHTML='<svg style=\"display:none\"><symbol id=shape><path fill=\"currentColor\" d=\"M1 1H9V9H1Z\"/></symbol></svg><svg id=icon width=20 height=20 style=\"color:red\"><use href=\"#shape\"/></svg>'");
            var list = page.Layout(new(800, 600));
            var image = Assert.Single(list.Commands, command => command.Kind == BrowserDrawKind.Image && command.Node == page.Document!.GetElementById("icon"));
            string text = Uri.UnescapeDataString(image.ImageSource[(image.ImageSource.IndexOf(',') + 1)..]);
            Assert.Contains("symbol", text, StringComparison.Ordinal);
            var pixels = BrowserSvgRasterizer.Decode(Encoding.UTF8.GetBytes(text), 400);
            Assert.Equal(0xFFFF0000u, pixels.Pixels.Span[4 * 20 + 4]);
        }
        finally { page.Release(); }
    }
}