using Shouldly;
using Xunit;
namespace ZB.MOM.WW.OtOpcUa.Driver.Ab.Transport.Tests;

public sealed class AbStatusCodesTests
{
    [Theory]
    [InlineData((byte)0x00, AbStatus.Ok)]
    [InlineData((byte)0x04, AbStatus.NotFound)]
    [InlineData((byte)0x05, AbStatus.NotFound)]
    [InlineData((byte)0x16, AbStatus.NotFound)]
    [InlineData((byte)0x06, AbStatus.Partial)]
    [InlineData((byte)0x08, AbStatus.Unsupported)]
    [InlineData((byte)0x0F, AbStatus.NotAllowed)]
    [InlineData((byte)0x10, AbStatus.DeviceStateConflict)]
    [InlineData((byte)0x13, AbStatus.TooSmall)]
    [InlineData((byte)0x15, AbStatus.TooLarge)]
    [InlineData((byte)0x0B, AbStatus.Ok)]
    [InlineData((byte)0x0A, AbStatus.OutOfBounds)]
    [InlineData((byte)0x0C, AbStatus.DeviceStateConflict)]
    [InlineData((byte)0x0E, AbStatus.NotAllowed)]
    [InlineData((byte)0x1E, AbStatus.BadReply)]
    [InlineData((byte)0x01, AbStatus.BadReply)]
    [InlineData((byte)0x07, AbStatus.BadReply)]       // connection lost: opaque on purpose (AbLegacy #738)
    // Lane K F1 (#737): the controller answered and refused this request — not a garbled reply.
    [InlineData((byte)0x1C, AbStatus.Unsupported)]    // missing attribute list entry data
    [InlineData((byte)0x20, AbStatus.Unsupported)]    // invalid parameter
    public void Cip_general_status_maps(byte general, AbStatus expected) =>
        AbStatusCodes.FromCip(general, ReadOnlySpan<ushort>.Empty).ShouldBe(expected);

    [Theory]
    [InlineData((ushort)0x2104, AbStatus.OutOfBounds)]   // offset beyond end of the tag (Lane K F1)
    [InlineData((ushort)0x2105, AbStatus.OutOfBounds)]
    [InlineData((ushort)0x2107, AbStatus.TypeMismatch)]
    [InlineData((ushort)0x9999, AbStatus.BadReply)]
    public void General_status_FF_maps_by_extended_status(ushort ext, AbStatus expected) =>
        AbStatusCodes.FromCip(0xFF, [ext]).ShouldBe(expected);

    [Fact]
    public void General_status_FF_with_no_extended_status_is_BadReply() =>
        AbStatusCodes.FromCip(0xFF, ReadOnlySpan<ushort>.Empty).ShouldBe(AbStatus.BadReply);

    [Theory]
    [InlineData((byte)0x00, null, AbStatus.Ok)]
    [InlineData((byte)0x10, null, AbStatus.Unsupported)]          // illegal command or format
    // Lane K F3 (AbLegacy F8, review 07 r0 I4), per the DF1/PCCC STS table (1770-6.5.16):
    [InlineData((byte)0x20, null, AbStatus.BadConnection)]        // host has a problem and will not communicate
    [InlineData((byte)0x30, null, AbStatus.BadConnection)]        // remote node host missing / disconnected / shut down
    [InlineData((byte)0x40, null, AbStatus.DeviceStateConflict)]  // host hardware fault (the host answered)
    [InlineData((byte)0x50, null, AbStatus.NotFound)]             // addressing problem or memory protect rungs
    [InlineData((byte)0x60, null, AbStatus.NotAllowed)]           // function not allowed due to command protection
    [InlineData((byte)0x70, null, AbStatus.DeviceStateConflict)]  // processor is in Program mode
    [InlineData((byte)0x80, null, AbStatus.BadReply)]             // compatibility-mode file missing: unclassified
    [InlineData((byte)0x90, null, AbStatus.BadConnection)]        // remote node cannot buffer command
    [InlineData((byte)0xB0, null, AbStatus.DeviceStateConflict)]  // remote node problem due to download
    [InlineData((byte)0xF0, (byte)0x06, AbStatus.NotFound)]       // address does not point to something usable
    [InlineData((byte)0xF0, (byte)0x07, AbStatus.OutOfBounds)]    // file is wrong size
    [InlineData((byte)0xF0, (byte)0x0A, AbStatus.BadReply)]
    [InlineData((byte)0xF0, null, AbStatus.BadReply)]
    public void Pccc_status_maps(byte sts, byte? ext, AbStatus expected) =>
        AbStatusCodes.FromPccc(sts, ext).ShouldBe(expected);

    /// <summary>
    ///     A dead DH+/DH-485 node behind a bridge answers STS 0x30 (and a busy one 0x90). Neither proves the END
    ///     device answered, so they are the no-reply comms class, never one of the "answered" refusals — that
    ///     classification made such a device count as reachable forever (no backoff, no comms-loss watchdog).
    /// </summary>
    /// <param name="sts">The PCCC STS byte.</param>
    [Theory]
    [InlineData((byte)0x20)]
    [InlineData((byte)0x30)]
    [InlineData((byte)0x90)]
    public void Pccc_no_reply_statuses_are_never_answered_refusals(byte sts)
    {
        var status = AbStatusCodes.FromPccc(sts, null);
        status.ShouldBe(AbStatus.BadConnection);
        status.ShouldNotBeOneOf(AbStatus.NotFound, AbStatus.NotAllowed, AbStatus.OutOfBounds,
            AbStatus.DeviceStateConflict, AbStatus.TooLarge, AbStatus.TooSmall, AbStatus.TypeMismatch);
    }

    [Fact]
    public void Ok_is_zero_and_every_error_is_negative()
    {
        ((int)AbStatus.Ok).ShouldBe(0);
        foreach (var s in Enum.GetValues<AbStatus>().Where(s => s is not AbStatus.Ok and not AbStatus.Pending))
            ((int)s).ShouldBeLessThan(0);
    }
}