using System.IO;
using System.Xml.Serialization;
using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.Entities;
using Xunit;

namespace Jellyfin.Model.Tests.Configuration;

public class EncodingOptionsTests
{
    [Theory]
    [InlineData("<EncoderPreset></EncoderPreset>")]
    [InlineData("<EncoderPreset />")]
    [InlineData("<EncoderPreset>  </EncoderPreset>")]
    [InlineData("<EncoderPreset>notapreset</EncoderPreset>")]
    [InlineData("<EncoderPreset>42</EncoderPreset>")]
    [InlineData("<EncoderPreset>-1</EncoderPreset>")]
    public void Deserialize_UnreadableEncoderPreset_FallsBackToDefault(string encoderPresetElement)
    {
        var options = Deserialize($"<EncodingOptions>{encoderPresetElement}<H264Crf>21</H264Crf></EncodingOptions>");

        Assert.Equal(EncoderPreset.auto, options.EncoderPreset);

        // The rest of the file has to survive: a throwing preset used to discard every other encoding setting.
        Assert.Equal(21, options.H264Crf);
    }

    [Fact]
    public void Deserialize_KnownEncoderPreset_IsKept()
    {
        var options = Deserialize("<EncodingOptions><EncoderPreset>veryfast</EncoderPreset></EncodingOptions>");

        Assert.Equal(EncoderPreset.veryfast, options.EncoderPreset);
    }

    [Fact]
    public void Serialize_WritesTheEncoderPresetElement()
    {
        var serializer = new XmlSerializer(typeof(EncodingOptions));
        using var writer = new StringWriter();
        serializer.Serialize(writer, new EncodingOptions { EncoderPreset = EncoderPreset.slow });

        Assert.Contains("<EncoderPreset>slow</EncoderPreset>", writer.ToString(), System.StringComparison.Ordinal);
    }

    private static EncodingOptions Deserialize(string xml)
    {
        var serializer = new XmlSerializer(typeof(EncodingOptions));
        using var reader = new StringReader(xml);
        return (EncodingOptions)serializer.Deserialize(reader)!;
    }
}