using NSubstitute;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Instances;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Templates;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Flattening;
using ZB.MOM.WW.ScadaBridge.DeploymentManager;
using ZB.MOM.WW.ScadaBridge.TemplateEngine.Flattening;
using ZB.MOM.WW.ScadaBridge.TemplateEngine.Validation;

namespace ZB.MOM.WW.ScadaBridge.DeploymentManager.Tests;

/// <summary>
/// M2.1 (#22): proves the FlatteningPipeline actually computes the alarm-capable
/// connection set from the loaded site data connections and threads it through
/// ValidationService → SemanticValidator. Before the fix the pipeline loaded the
/// connections but never passed the capable set, so the native-alarm-source
/// capability check (built but inert) never ran in production — a source bound to
/// a non-alarm-capable connection deployed silently.
/// </summary>
public class FlatteningPipelineNativeAlarmCapabilityTests
{
    private const int InstanceId = 1;
    private const int TemplateId = 10;
    private const int SiteId = 100;

    private readonly ITemplateEngineRepository _templateRepo = Substitute.For<ITemplateEngineRepository>();
    private readonly ISiteRepository _siteRepo = Substitute.For<ISiteRepository>();
    private readonly FlatteningPipeline _sut;

    public FlatteningPipelineNativeAlarmCapabilityTests()
    {
        _sut = new FlatteningPipeline(
            _templateRepo,
            _siteRepo,
            new FlatteningService(),
            new ValidationService(),
            new RevisionHashService());
    }

    /// <summary>
    /// Seeds a single-template chain whose only template carries one native alarm
    /// source bound to <paramref name="connectionName"/>, and a site that owns a
    /// single data connection of <paramref name="connectionProtocol"/>.
    /// </summary>
    private void Arrange(string connectionName, string connectionProtocol, string boundConnectionName)
    {
        var template = new Template("Tank") { Id = TemplateId };
        template.NativeAlarmSources.Add(new TemplateNativeAlarmSource("BoilerAlarms")
        {
            ConnectionName = boundConnectionName,
            SourceReference = "ns=2;s=Boiler",
        });

        var instance = new Instance("Tank-01") { Id = InstanceId, TemplateId = TemplateId, SiteId = SiteId };

        _templateRepo.GetInstanceByIdAsync(InstanceId, Arg.Any<CancellationToken>()).Returns(instance);
        _templateRepo.GetTemplateWithChildrenAsync(TemplateId, Arg.Any<CancellationToken>()).Returns(template);
        _templateRepo.GetCompositionsByTemplateIdAsync(TemplateId, Arg.Any<CancellationToken>())
            .Returns([]);
        _templateRepo.GetAllSharedScriptsAsync(Arg.Any<CancellationToken>())
            .Returns([]);

        var connection = new DataConnection(connectionName, connectionProtocol, SiteId) { Id = 7 };
        _siteRepo.GetDataConnectionsBySiteIdAsync(SiteId, Arg.Any<CancellationToken>())
            .Returns([connection]);
    }

    [Fact]
    public async Task FlattenAndValidate_NativeAlarmSourceOnNonAlarmCapableConnection_ReportsCapabilityError()
    {
        // A "Modbus" connection is NOT alarm-capable (no IAlarmSubscribableConnection adapter).
        Arrange(connectionName: "PlantBus", connectionProtocol: "Modbus", boundConnectionName: "PlantBus");

        var result = await _sut.FlattenAndValidateAsync(InstanceId);

        Assert.True(result.IsSuccess);
        Assert.Contains(result.Value.Validation.Errors,
            e => e.Category == ValidationCategory.NativeAlarmSourceInvalid
              && e.Message.Contains("alarm-capable"));
    }

    [Theory]
    [InlineData("OpcUa")]
    [InlineData("MxGateway")]
    // Case variants: IsAlarmCapable uses OrdinalIgnoreCase, matching DataConnectionFactory's
    // own OrdinalIgnoreCase protocol-key lookup; lock the contract with non-canonical casing.
    [InlineData("OPCUA")]
    [InlineData("opcua")]
    [InlineData("mxgateway")]
    [InlineData("MXGATEWAY")]
    public async Task FlattenAndValidate_NativeAlarmSourceOnAlarmCapableConnection_NoCapabilityError(string protocol)
    {
        Arrange(connectionName: "Boiler", connectionProtocol: protocol, boundConnectionName: "Boiler");

        var result = await _sut.FlattenAndValidateAsync(InstanceId);

        Assert.True(result.IsSuccess);
        Assert.DoesNotContain(result.Value.Validation.Errors,
            e => e.Category == ValidationCategory.NativeAlarmSourceInvalid);
    }
}