namespace MeetingAssistant.Tests;

public sealed class SampleWavFixtureTests
{
    [Fact]
    public async Task SampleWavFixtureIsSmallMonoPcmAudio()
    {
        var path = Path.Combine(AppContext.BaseDirectory, "Fixtures", "sample-16khz-mono.wav");
        var bytes = await File.ReadAllBytesAsync(path);

        Assert.True(bytes.Length < 16_000);
        Assert.Equal("RIFF", ReadAscii(bytes, 0, 4));
        Assert.Equal("WAVE", ReadAscii(bytes, 8, 4));
        Assert.Equal("fmt ", ReadAscii(bytes, 12, 4));
        Assert.Equal((short)1, BitConverter.ToInt16(bytes, 20));
        Assert.Equal((short)1, BitConverter.ToInt16(bytes, 22));
        Assert.Equal(16000, BitConverter.ToInt32(bytes, 24));
        Assert.Equal((short)16, BitConverter.ToInt16(bytes, 34));
    }

    private static string ReadAscii(byte[] bytes, int start, int length)
    {
        return System.Text.Encoding.ASCII.GetString(bytes, start, length);
    }
}