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

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

/// <summary>
///     Gitea #534 — the authored EtherNet/IP port must reach libplctag's <c>gateway</c> attribute.
/// </summary>
/// <remarks>
///     This driver carried the identical defect to AbLegacy, where it was found:
///     <see cref="AbCipTagCreateParams.Port"/> was on the record and consumed by nobody, so the runtime
///     handed libplctag the bare host and libplctag substituted 44818. It survived here precisely because
///     it is invisible here — every AbCip fixture profile binds 44818, so no test this driver has could
///     distinguish "uses the authored port" from "always uses 44818". Worth remembering as a shape: a
///     fixture that only ever exercises the default value cannot falsify a rule about non-default values,
///     however many tests point at it.
/// </remarks>
public sealed class AbCipGatewayCompositionTests
{
    private static AbCipTagCreateParams Params(string host, int port) =>
        new(Gateway: host, Port: port, CipPath: "1,0", LibplctagPlcAttribute: "controllogix",
            TagName: "TestDINT", Timeout: TimeSpan.FromSeconds(5));

    [Fact]
    public void The_authored_port_is_appended_to_the_gateway()
    {
        Params("10.100.0.35", 44900).LibplctagGateway.ShouldBe("10.100.0.35:44900");
    }

    [Fact]
    public void The_default_port_is_still_written_explicitly()
    {
        Params("plc1.plant.local", 44818).LibplctagGateway.ShouldBe("plc1.plant.local:44818");
    }

    [Theory]
    [InlineData(0)]
    [InlineData(-1)]
    public void A_missing_port_falls_back_to_the_bare_host(int port)
    {
        Params("10.100.0.35", port).LibplctagGateway.ShouldBe("10.100.0.35");
    }

    // Gitea #539 — #534 fixed the data path but both DISCOVERY call sites kept passing the bare
    // Gateway, so "Browse controller" against a device authored on a non-default port silently
    // browsed whatever answers on 44818. These pin the composed gateway at the actual libplctag
    // Tag construction seam, which the property-only tests above structurally cannot: they proved
    // LibplctagGateway composes correctly while nothing proved each Tag builder consumes it.

    [Fact]
    public void The_symbol_list_browse_tag_carries_the_authored_port()
    {
        using var tag = LibplctagListingReader.BuildSymbolListTag(Params("10.100.0.35", 44999));
        tag.Gateway.ShouldBe("10.100.0.35:44999");
        tag.Name.ShouldBe("@tags");
    }

    [Fact]
    public void The_template_read_tag_carries_the_authored_port()
    {
        using var tag = LibplctagTemplateReader.BuildTemplateTag(Params("10.100.0.35", 44999), templateInstanceId: 0x123);
        tag.Gateway.ShouldBe("10.100.0.35:44999");
        tag.Name.ShouldBe("@udt/291");
    }
}