using AVEVA.Historian.Client.Wcf;

namespace AVEVA.Historian.Client.Tests;

public sealed class WcfStatusProtocolTests
{
    [Fact]
    public void SystemTimeParserReadsWindowsSystemTimeLayout()
    {
        byte[] buffer =
        [
            0xEA, 0x07,
            0x04, 0x00,
            0x04, 0x00,
            0x1E, 0x00,
            0x0D, 0x00,
            0x2A, 0x00,
            0x07, 0x00,
            0x7B, 0x00
        ];

        DateTime? parsed = HistorianStatusProtocol.TryReadSystemTime(buffer);

        Assert.Equal(new DateTime(2026, 4, 30, 13, 42, 7, 123), parsed);
    }

    [Fact]
    public void SystemTimeParserRejectsShortAndInvalidBuffers()
    {
        Assert.Null(HistorianStatusProtocol.TryReadSystemTime([0xEA, 0x07]));

        byte[] invalidMonth =
        [
            0xEA, 0x07,
            0x00, 0x00,
            0x04, 0x00,
            0x1E, 0x00,
            0x0D, 0x00,
            0x2A, 0x00,
            0x07, 0x00,
            0x7B, 0x00
        ];
        Assert.Null(HistorianStatusProtocol.TryReadSystemTime(invalidMonth));
    }
}