using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.AdminUI.Components.Shared.Drivers;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
using ZB.MOM.WW.OtOpcUa.Core.Resilience;

public class ResilienceFormModelTests
{
    /// <summary>Verifies that a blank form model serializes to null JSON.</summary>
    [Fact]
    public void Blank_form_serializes_to_null()
        => new ResilienceFormModel().ToJson().ShouldBeNull();

    /// <summary>Verifies that a partial policy override round-trips correctly through JSON.</summary>
    [Fact]
    public void Partial_override_round_trips()
    {
        var m = new ResilienceFormModel { BulkheadMaxConcurrent = 16 };
        m.Policies["Read"].TimeoutSeconds = 5;
        m.Policies["Read"].RetryCount = 5;

        var json = m.ToJson();
        json.ShouldNotBeNull();

        var back = ResilienceFormModel.FromJson(json);
        back.BulkheadMaxConcurrent.ShouldBe(16);
        back.Policies["Read"].TimeoutSeconds.ShouldBe(5);
        back.Policies["Write"].IsEmpty.ShouldBeTrue();
    }

    /// <summary>Verifies that malformed JSON input yields an empty model with no-error handling.</summary>
    [Fact]
    public void Malformed_json_yields_empty_model()
    {
        var m = ResilienceFormModel.FromJson("{ not valid json");
        m.BulkheadMaxConcurrent.ShouldBeNull();
        m.Policies["Read"].IsEmpty.ShouldBeTrue();
    }

    /// <summary>Verifies that JSON emitted by the form model can be parsed by the runtime resilience options parser.</summary>
    [Fact]
    public void Emitted_json_is_consumable_by_the_runtime_parser()
    {
        var m = new ResilienceFormModel { BulkheadMaxConcurrent = 16 };
        m.Policies["Read"].TimeoutSeconds = 7;

        var opts = DriverResilienceOptionsParser.ParseOrDefaults(DriverTier.B, m.ToJson(), out var diag);
        diag.ShouldBeNull();
        opts.BulkheadMaxConcurrent.ShouldBe(16);
        opts.Resolve(DriverCapability.Read).TimeoutSeconds.ShouldBe(7);
        opts.Resolve(DriverCapability.Write).RetryCount.ShouldBe(0);
    }
}