using System.Security.Claims;
using ZB.MOM.WW.ScadaBridge.Security;
using Akka.Actor;
using Bunit;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Shared;
using NSubstitute;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
using ZB.MOM.WW.ScadaBridge.Commons.Messages.Notification;
using ZB.MOM.WW.ScadaBridge.Communication;
using NotificationReportPage = ZB.MOM.WW.ScadaBridge.CentralUI.Components.Pages.Notifications.NotificationReport;

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

/// <summary>
/// bUnit tests for the Notification Report row-detail modal — double-clicking a
/// notification row opens a Bootstrap modal showing that notification's full,
/// untruncated details.
///
/// Mirrors <see cref="NotificationReportPageTests"/>'s seam: the report's
/// <see cref="CommunicationService"/> calls route through an injected scripted
/// actor (the notification-outbox proxy).
/// </summary>
public class NotificationReportDetailModalTests : BunitContext
{
    private readonly ActorSystem _system = ActorSystem.Create("notif-report-modal-tests");
    private readonly CommunicationService _comms;

    private NotificationDetailResponse _detailReply =
        new("d", true, null, new NotificationDetail(
            NotificationId: "notif-aaaaaaaa-1111-full-id",
            Type: "Email",
            ListName: "Ops On-Call",
            Subject: "Pump fault at Plant-A",
            Body: "Pump-001 tripped on overcurrent at 14:32. Investigate immediately.",
            Status: "Parked",
            RetryCount: 3,
            LastError: "SMTP timeout connecting to mail relay",
            ResolvedTargets: "[\"ops@example.com\",\"oncall@example.com\"]",
            TypeData: null,
            SourceSiteId: "plant-a",
            SourceInstanceId: "Pump-001",
            SourceScript: "PumpFault.csx",
            SiteEnqueuedAt: DateTimeOffset.UtcNow.AddMinutes(-31),
            CreatedAt: DateTimeOffset.UtcNow.AddMinutes(-30),
            LastAttemptAt: DateTimeOffset.UtcNow.AddMinutes(-5),
            NextAttemptAt: null,
            DeliveredAt: null));

    private NotificationOutboxQueryResponse _queryReply =
        new("q", true, null, new List<NotificationSummary>
        {
            new("notif-aaaaaaaa-1111-full-id", "Email", "Ops On-Call", "Pump fault at Plant-A",
                "Parked", RetryCount: 3, LastError: "SMTP timeout connecting to mail relay",
                SourceSiteId: "plant-a", SourceInstanceId: "Pump-001",
                CreatedAt: DateTimeOffset.UtcNow.AddMinutes(-30),
                DeliveredAt: null, IsStuck: true),
            new("notif-bbbbbbbb-2222-full-id", "Email", "Maintenance", "Daily summary",
                "Delivered", RetryCount: 0, LastError: null, SourceSiteId: "plant-b",
                SourceInstanceId: null, CreatedAt: DateTimeOffset.UtcNow.AddHours(-2),
                DeliveredAt: DateTimeOffset.UtcNow.AddHours(-2), IsStuck: false),
        }, TotalCount: 2);

    public NotificationReportDetailModalTests()
    {
        _comms = new CommunicationService(
            Options.Create(new CommunicationOptions()),
            NullLogger<CommunicationService>.Instance);

        var outbox = _system.ActorOf(Props.Create(() => new ScriptedOutboxActor(this)));
        _comms.SetNotificationOutbox(outbox);

        Services.AddSingleton(_comms);
        Services.AddSingleton<IDialogService>(new AlwaysConfirmDialogService());

        var siteRepo = Substitute.For<ISiteRepository>();
        siteRepo.GetAllSitesAsync(Arg.Any<CancellationToken>())
            .Returns(Task.FromResult<IReadOnlyList<Site>>(new List<Site>
            {
                new("Plant A", "plant-a") { Id = 1 },
                new("Plant B", "plant-b") { Id = 2 },
            }));
        Services.AddSingleton(siteRepo);

        var claims = new[]
        {
            new Claim(JwtTokenService.UsernameClaimType, "tester"),
            new Claim(JwtTokenService.RoleClaimType, "Deployer"),
        };
        var user = new ClaimsPrincipal(new ClaimsIdentity(claims, "TestAuth"));
        Services.AddSingleton<AuthenticationStateProvider>(new TestAuthStateProvider(user));
        Services.AddAuthorizationCore();
        Services.AddScoped<ZB.MOM.WW.ScadaBridge.CentralUI.Auth.SiteScopeService>();
    }

    [Fact]
    public void DoubleClickRow_OpensDetailModal()
    {
        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        // No modal initially.
        Assert.Empty(cut.FindAll(".modal.show"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();

        cut.WaitForAssertion(() =>
        {
            var modal = cut.Find(".modal.show");
            Assert.Contains("Pump fault at Plant-A", modal.TextContent);
            Assert.Contains("Ops On-Call", modal.TextContent);
        });
    }

    [Fact]
    public void Modal_ShowsFullNotificationId_NotTruncated()
    {
        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();

        cut.WaitForAssertion(() =>
        {
            var modal = cut.Find(".modal.show");
            // The grid renders ShortId(...) (first 12 chars); the modal must show
            // the complete identifier.
            Assert.Contains("notif-aaaaaaaa-1111-full-id", modal.TextContent);
        });
    }

    [Fact]
    public void CloseButton_DismissesModal()
    {
        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();

        cut.WaitForState(() => cut.FindAll(".modal.show").Count > 0);

        var closeButton = cut.Find(".modal.show .modal-footer button");
        closeButton.Click();

        cut.WaitForAssertion(() => Assert.Empty(cut.FindAll(".modal.show")));
    }

    [Fact]
    public void Modal_ShowsLastError_WhenPresent()
    {
        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();

        cut.WaitForAssertion(() =>
        {
            var modal = cut.Find(".modal.show");
            Assert.Contains("SMTP timeout connecting to mail relay", modal.TextContent);
        });
    }

    [Fact]
    public void Modal_FetchesAndShowsBody()
    {
        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();

        cut.WaitForAssertion(() =>
        {
            var modal = cut.Find(".modal.show");
            Assert.Contains(
                "Pump-001 tripped on overcurrent at 14:32. Investigate immediately.",
                modal.TextContent);
        });
    }

    [Fact]
    public void Modal_ShowsRecipients_FromResolvedTargets()
    {
        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();

        cut.WaitForAssertion(() =>
        {
            var modal = cut.Find(".modal.show");
            Assert.Contains("ops@example.com", modal.TextContent);
            Assert.Contains("oncall@example.com", modal.TextContent);
        });
    }

    [Fact]
    public void Modal_ShowsListFallback_WhenResolvedTargetsNull()
    {
        _detailReply = _detailReply with
        {
            Detail = _detailReply.Detail! with { ResolvedTargets = null },
        };

        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();

        cut.WaitForAssertion(() =>
        {
            var modal = cut.Find(".modal.show");
            Assert.Contains("Not yet resolved", modal.TextContent);
            Assert.Contains("Ops On-Call", modal.TextContent);
            Assert.Contains("at delivery time", modal.TextContent);
        });
    }

    [Fact]
    public void Modal_ShowsError_WhenDetailFetchFails()
    {
        _detailReply = new NotificationDetailResponse("d", false, "detail store unavailable", null);

        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();

        cut.WaitForAssertion(() =>
        {
            var modal = cut.Find(".modal.show");
            // The error surfaces in the body/recipient sections...
            Assert.Contains("detail store unavailable", modal.TextContent);
            // ...but the summary fields (from the grid row) still render.
            Assert.Contains("Ops On-Call", modal.TextContent);
            Assert.Contains("notif-aaaaaaaa-1111-full-id", modal.TextContent);
        });
    }

    /// <summary>
    /// The modal must stay mounted when the row it was opened for leaves the
    /// current page — it is gated on user intent (the held id), never on the
    /// row still resolving.
    ///
    /// This is a race regression guard, not a cosmetic one. When the subtree was
    /// gated on the resolve, a refresh that dropped the row unmounted the whole
    /// modal and disposed every event-handler id inside it, Close's included. A
    /// click already in flight against a disposed handler makes the renderer
    /// throw GetRequiredEventBindingEntry — which is exactly how this surfaced,
    /// as an intermittent failure in CloseButton_DismissesModal.
    /// </summary>
    [Fact]
    public void Modal_StaysOpen_WhenItsRowLeavesThePage()
    {
        var cut = Render<NotificationReportPage>();
        cut.WaitForState(() => cut.Markup.Contains("Pump fault at Plant-A"));

        var row = cut.FindAll("tbody tr")
            .First(r => r.TextContent.Contains("Pump fault at Plant-A"));
        row.DoubleClick();
        cut.WaitForState(() => cut.FindAll(".modal.show").Count > 0);

        // The next query drops the opened row, as a refresh, filter change or
        // page change legitimately can while the modal is open.
        _queryReply = _queryReply with
        {
            Notifications = _queryReply.Notifications!
                .Where(n => n.NotificationId != "notif-aaaaaaaa-1111-full-id")
                .ToList(),
            TotalCount = 1,
        };

        cut.FindAll("button").First(b => b.TextContent.Contains("Query")).Click();
        cut.WaitForState(() => !cut.Markup.Contains("Pump fault at Plant-A"));

        // Still mounted, and it says why the summary is missing rather than
        // vanishing out from under the user.
        var modal = cut.Find(".modal.show");
        Assert.NotNull(modal.QuerySelector("[data-test='detail-row-gone']"));

        // The detail that was already fetched is keyed by id, so it survives.
        Assert.Contains(
            "Pump-001 tripped on overcurrent at 14:32. Investigate immediately.",
            modal.TextContent);

        // Row-scoped actions are gone (nothing to relay against) but Close is not,
        // and it still works — the handler was never disposed.
        Assert.DoesNotContain("Retry", modal.QuerySelector(".modal-footer")!.TextContent);
        cut.Find(".modal.show .modal-footer button").Click();
        cut.WaitForAssertion(() => Assert.Empty(cut.FindAll(".modal.show")));
    }

    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            _system.Terminate().Wait(TimeSpan.FromSeconds(5));
        }
        base.Dispose(disposing);
    }

    private sealed class ScriptedOutboxActor : ReceiveActor
    {
        public ScriptedOutboxActor(NotificationReportDetailModalTests test)
        {
            Receive<NotificationOutboxQueryRequest>(_ => Sender.Tell(test._queryReply));
            Receive<NotificationDetailRequest>(r => Sender.Tell(test._detailReply with
            {
                CorrelationId = r.CorrelationId,
            }));
            Receive<RetryNotificationRequest>(r =>
                Sender.Tell(new RetryNotificationResponse(r.CorrelationId, true, null)));
            Receive<DiscardNotificationRequest>(r =>
                Sender.Tell(new DiscardNotificationResponse(r.CorrelationId, true, null)));
        }
    }

    private sealed class AlwaysConfirmDialogService : IDialogService
    {
        public Task<bool> ConfirmAsync(string title, string message, bool danger = false)
            => Task.FromResult(true);

        public Task<string?> PromptAsync(
            string title, string label, string initialValue = "", string? placeholder = null)
            => Task.FromResult<string?>(null);

        public Task<TResult?> ShowAsync<TResult>(
            string title,
            Microsoft.AspNetCore.Components.RenderFragment<DialogContext<TResult>> body,
            string? size = null)
            => Task.FromResult<TResult?>(default);
    }
}
