using AVEVA.Historian.Client.Protocol;

namespace AVEVA.Historian.Client.Tests;

public sealed class FrameTests
{
    [Fact]
    public async Task FrameWriterAndReader_RoundTrip()
    {
        HistorianFrame frame = new((HistorianMessageType)42, 123u, new byte[] { 1, 2, 3, 4 });
        byte[] bytes = HistorianFrameWriter.ToArray(frame);

        HistorianFrame actual = await HistorianFrameReader.ReadAsync(new MemoryStream(bytes), CancellationToken.None);

        Assert.Equal(frame.MessageType, actual.MessageType);
        Assert.Equal(frame.CorrelationId, actual.CorrelationId);
        Assert.True(frame.Payload.Span.SequenceEqual(actual.Payload.Span));
    }

    [Fact]
    public async Task FrameReader_RejectsInvalidLength()
    {
        byte[] bytes = [1, 0, 0, 0, 0, 0, 0, 0, 0, 0];

        await Assert.ThrowsAsync<FrameFormatException>(async () =>
            await HistorianFrameReader.ReadAsync(new MemoryStream(bytes), CancellationToken.None));
    }
}