using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Driver.AbCip;

namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.Tests;

/// <summary>
///     Symbol Object (<c>@tags</c>) entries captured byte for byte off two real CompactLogix
///     controllers on 2026-10-07 (read-only, one listing read each): a 5069-L320ERS2 rev 34.11 press
///     and a second CompactLogix. Unlike the <c>ab_server</c> capture in
///     <see cref="CipSymbolObjectWireCaptureTests"/> — which reports every scalar as a 1-element
///     array — a real controller sets the dimension bits only on genuine arrays.
/// </summary>
[Trait("Category", "Unit")]
public sealed class CipSymbolObjectRealControllerCaptureTests
{
    // Controller scope, press: WW_InCycle (BOOL), Inf_LookupFwkB (UDT[23], template 3386),
    // Program:UN01_Press (the program entry itself, type 0x1068).
    internal const string WwInCycle = "AF010000C10001000000000000000000000000000A0057575F496E4379636C65";
    internal const string InfLookupFwkB = "6D0000003AAD60001700000000000000000000000E00496E665F4C6F6F6B757046776B42";
    internal const string ProgramUn01 = "7900000068100000000000000000000000000000120050726F6772616D3A554E30315F5072657373";

    // Controller scope, second controller: arrSysTime (DINT[7]), arrMessages (STRING[50]).
    internal const string ArrSysTime = "11000000C42004000700000000000000000000000A0061727253797354696D65";
    internal const string ArrMessages = "61000000CEAF58003200000000000000000000000B006172724D65737361676573";

    // Program:UN01_Press.@tags: names arrive WITHOUT the Program: prefix.
    internal const string OutEState = "1A000000C40004000000000000000000000000000A004F75745F655374617465";
    internal const string DisableStates = "4C000000C42004002000000000000000000000000E005F44697361626C65537461746573";

    private static List<AbCipDiscoveredTag> Decode(params string[] entries) =>
        CipSymbolObjectDecoder.Decode(Convert.FromHexString(string.Concat(entries))).ToList();

    /// <summary>Array dimensions in the entry surface as IsArray + ElementCount; scalars stay scalar.</summary>
    [Fact]
    public void Real_controller_arrays_surface_their_element_count()
    {
        var tags = Decode(WwInCycle, InfLookupFwkB, ArrSysTime, ArrMessages);

        var inCycle = tags.Single(t => t.Name == "WW_InCycle");
        inCycle.IsArray.ShouldBeFalse();
        inCycle.ElementCount.ShouldBe(1);

        var sysTime = tags.Single(t => t.Name == "arrSysTime");
        sysTime.DataType.ShouldBe(AbCipDataType.DInt);
        sysTime.IsArray.ShouldBeTrue();
        sysTime.ElementCount.ShouldBe(7);

        var lookup = tags.Single(t => t.Name == "Inf_LookupFwkB");
        lookup.DataType.ShouldBe(AbCipDataType.Structure);
        lookup.TemplateInstanceId.ShouldBe(3386u);
        lookup.IsArray.ShouldBeTrue();
        lookup.ElementCount.ShouldBe(23);

        var messages = tags.Single(t => t.Name == "arrMessages");
        messages.TemplateInstanceId.ShouldBe(0x0FCEu);
        messages.IsArray.ShouldBeTrue();
        messages.ElementCount.ShouldBe(50);
    }

    /// <summary>A program entry is a system tag whose program name the enumerator can walk.</summary>
    [Fact]
    public void Program_entry_is_system_and_names_its_program()
    {
        var program = Decode(ProgramUn01).ShouldHaveSingleItem();

        program.IsSystemTag.ShouldBeTrue();
        CipSymbolObjectDecoder.ProgramNameOf(program).ShouldBe("UN01_Press");
        CipSymbolObjectDecoder.ProgramNameOf(Decode(WwInCycle).Single()).ShouldBeNull();
    }

    /// <summary>A program listing decodes with the program as each tag's scope.</summary>
    [Fact]
    public void Program_listing_decodes_with_program_scope()
    {
        var tags = CipSymbolObjectDecoder.Decode(
            Convert.FromHexString(OutEState + DisableStates), programScope: "UN01_Press").ToList();

        tags.Select(t => t.Name).ShouldBe(["Out_eState", "_DisableStates"]);
        tags.ShouldAllBe(t => t.ProgramScope == "UN01_Press");
        tags[0].DataType.ShouldBe(AbCipDataType.DInt);
        tags[1].IsArray.ShouldBeTrue();
        tags[1].ElementCount.ShouldBe(32);
    }
}