using System.Runtime.InteropServices;
using UnitTestSharp;

namespace Susurrus.XAudio2.UnitTests
{
    public class WaveFormatExTests : TestFixture
    {
        public class LayoutTests : TestFixture
        {
            public void IsEighteenBytes()
            {
                CheckEqual(18, Marshal.SizeOf(typeof(WaveFormatEx)));
            }
        }

        public class OfTests : TestFixture
        {
            public void Pcm16Mono_DescribesTwoByteFrames()
            {
                WaveFormatEx format = WaveFormatEx.Of(SampleFormat.Pcm16, channelCount: 1, sampleRate: 44100);

                CheckEqual(WaveFormatEx.PcmTag, format.FormatTag);
                CheckEqual(1, format.Channels);
                CheckEqual(44100u, format.SamplesPerSecond);
                CheckEqual(88200u, format.AverageBytesPerSecond);
                CheckEqual(2, format.BlockAlign);
                CheckEqual(16, format.BitsPerSample);
                CheckEqual(0, format.ExtraSize);
            }

            public void Float32Stereo_DescribesEightByteFrames()
            {
                WaveFormatEx format = WaveFormatEx.Of(SampleFormat.Float32, channelCount: 2, sampleRate: 48000);

                CheckEqual(WaveFormatEx.FloatTag, format.FormatTag);
                CheckEqual(2, format.Channels);
                CheckEqual(48000u, format.SamplesPerSecond);
                CheckEqual(384000u, format.AverageBytesPerSecond);
                CheckEqual(8, format.BlockAlign);
                CheckEqual(32, format.BitsPerSample);
            }
        }
    }
}