using System.Security.Claims;
using Bunit;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.AspNetCore.Components.Rendering;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using NSubstitute;
using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Shared;
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.Interfaces.Services;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Transport;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
using ZB.MOM.WW.ScadaBridge.Communication;
using ZB.MOM.WW.ScadaBridge.DeploymentManager;
using ZB.MOM.WW.ScadaBridge.Security;
using ZB.MOM.WW.ScadaBridge.TemplateEngine.Services;
using TopologyPage = ZB.MOM.WW.ScadaBridge.CentralUI.Components.Pages.Deployment.Topology;

namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.Deployment;

/// <summary>
/// Pins the verbs on the Topology instance-action confirmations (deferred-work
/// register row 28): <em>Disable</em> must read "Disable", not the red button's
/// historical "Delete" default, while a genuine Delete must still read "Delete".
/// Like <c>FailoverConfirmLabelTests</c> these run the real <see cref="DialogService"/>
/// behind a real <c>DialogHost</c>, so they pin what the user reads rather than
/// the argument a substitute received.
/// </summary>
public class TopologyDisableConfirmLabelTests : BunitContext
{
    private readonly ITemplateEngineRepository _repo = Substitute.For<ITemplateEngineRepository>();
    private readonly ISiteRepository _siteRepo = Substitute.For<ISiteRepository>();
    private readonly IDeploymentManagerRepository _deployRepo = Substitute.For<IDeploymentManagerRepository>();
    private readonly IFlatteningPipeline _pipeline = Substitute.For<IFlatteningPipeline>();
    private readonly IAuditService _audit = Substitute.For<IAuditService>();
    private readonly DialogService _dialog = new();

    public TopologyDisableConfirmLabelTests()
    {
        Services.AddSingleton(_repo);
        Services.AddSingleton(_siteRepo);
        Services.AddSingleton(_deployRepo);
        Services.AddSingleton(_pipeline);
        Services.AddSingleton(_audit);

        // DeploymentService has non-mockable concrete deps; instantiate them directly
        // (the same DI block TopologyPageTests uses to render this page).
        Services.AddSingleton(new CommunicationService(
            Options.Create(new CommunicationOptions()),
            NullLogger<CommunicationService>.Instance));
        Services.AddSingleton(new OperationLockManager());
        Services.AddSingleton(Options.Create(new DeploymentManagerOptions
        {
            OperationLockTimeout = TimeSpan.FromSeconds(5)
        }));
        Services.AddSingleton(Options.Create(new CommunicationOptions()));
        Services.AddSingleton<ILogger<DeploymentService>>(NullLogger<DeploymentService>.Instance);
        Services.AddScoped<ZB.MOM.WW.ScadaBridge.TemplateEngine.Flattening.DiffService>();
        Services.AddScoped<ZB.MOM.WW.ScadaBridge.TemplateEngine.Flattening.RevisionHashService>();
        Services.AddSingleton<IDeploymentStatusNotifier>(
            new DeploymentStatusNotifier(NullLogger<DeploymentStatusNotifier>.Instance));
        Services.AddSingleton(Substitute.For<IStaleInstanceProbe>());
        Services.AddScoped<DeploymentService>();
        Services.AddScoped<AreaService>();
        Services.AddScoped<InstanceService>();
        Services.AddScoped<ZB.MOM.WW.ScadaBridge.CentralUI.Auth.SiteScopeService>();

        // The concrete service registered as the interface, so the page and the
        // host share one instance (DialogHost injects IDialogService and casts).
        Services.AddSingleton<IDialogService>(_dialog);

        var claims = new[]
        {
            new Claim(JwtTokenService.UsernameClaimType, "tester"),
            new Claim(JwtTokenService.RoleClaimType, Roles.Deployer)
        };
        Services.AddSingleton<AuthenticationStateProvider>(
            new TestAuthStateProvider(new ClaimsPrincipal(new ClaimsIdentity(claims, "TestAuth"))));
        Services.AddAuthorizationCore();

        JSInterop.Mode = JSRuntimeMode.Loose;
    }

    /// <summary>One site with one enabled instance, so both Disable and Delete are offered.</summary>
    private void SeedOneEnabledInstance()
    {
        _siteRepo.GetAllSitesAsync(Arg.Any<CancellationToken>())
            .Returns(Task.FromResult<IReadOnlyList<Site>>(
                new List<Site> { new("Plant-A", "plant-a") { Id = 1 } }));
        _repo.GetAllTemplatesAsync(Arg.Any<CancellationToken>())
            .Returns(Task.FromResult<IReadOnlyList<Template>>(new List<Template>()));
        _repo.GetAllInstancesAsync(Arg.Any<CancellationToken>())
            .Returns(Task.FromResult<IReadOnlyList<Instance>>(new List<Instance>
            {
                new("Pump-001") { Id = 100, SiteId = 1, State = InstanceState.Enabled }
            }));
        _repo.GetAreasBySiteIdAsync(Arg.Any<int>(), Arg.Any<CancellationToken>())
            .Returns(Task.FromResult<IReadOnlyList<Area>>(new List<Area>()));
    }

    /// <summary>Renders Topology next to a live DialogHost, as MainLayout does.</summary>
    private IRenderedComponent<TestHostWrapper> RenderPageWithHost() => Render<TestHostWrapper>();

    /// <summary>Wrapper so the page and the dialog host share one render tree.</summary>
    public sealed class TestHostWrapper : ComponentBase
    {
        protected override void BuildRenderTree(RenderTreeBuilder builder)
        {
            builder.OpenComponent<TopologyPage>(0);
            builder.CloseComponent();
            builder.OpenComponent<DialogHost>(1);
            builder.CloseComponent();
        }
    }

    /// <summary>
    /// Expands to the instance row, opens its context menu and clicks the named item,
    /// then returns the confirmation modal's footer buttons.
    /// </summary>
    /// <remarks>
    /// The menu click is deliberately not awaited: with a real DialogService the page's
    /// handler parks on <c>await ConfirmAsync(...)</c> until the dialog is answered.
    /// </remarks>
    private (IRenderedComponent<TestHostWrapper> cut, IReadOnlyList<AngleSharp.Dom.IElement> footer)
        OpenInstanceConfirm(string menuItem)
    {
        SeedOneEnabledInstance();
        var cut = RenderPageWithHost();

        cut.FindAll(".tv-row").First(r => r.QuerySelector(".tv-label")?.TextContent == "Plant-A")
           .QuerySelector(".tv-toggle")!.Click();

        var row = cut.FindAll(".tv-row").First(r => r.QuerySelector(".tv-label")?.TextContent == "Pump-001");
        row.ContextMenu();

        _ = cut.Find(".dropdown-menu.show")
               .QuerySelectorAll("button.dropdown-item")
               .First(b => b.TextContent.Trim() == menuItem)
               .ClickAsync(new());

        cut.WaitForState(() => cut.FindAll("div.modal-footer button").Count > 0);
        return (cut, cut.FindAll("div.modal-footer button").ToList());
    }

    [Fact]
    public void Disable_confirm_button_says_disable_not_delete()
    {
        var (_, footer) = OpenInstanceConfirm("Disable");
        var confirm = footer.Last();

        Assert.Equal("Disable", confirm.TextContent.Trim());
        Assert.Contains("btn-danger", confirm.ClassList);
        Assert.Contains("Cancel", footer.Select(b => b.TextContent.Trim()));
    }

    [Fact]
    public void Disable_confirm_body_names_the_instance()
    {
        var (cut, _) = OpenInstanceConfirm("Disable");
        Assert.Contains("Disable instance 'Pump-001'?", cut.Find(".modal-body").TextContent);
    }

    [Fact]
    public void Delete_confirm_button_still_says_delete()
    {
        // The negative twin: relabelling Disable must not have changed the genuine
        // delete path, which relies on the danger-confirm default.
        var confirm = OpenInstanceConfirm("Delete").footer.Last();

        Assert.Equal("Delete", confirm.TextContent.Trim());
        Assert.Contains("btn-danger", confirm.ClassList);
    }
}