using Bunit;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using NSubstitute;
using System.Security.Claims;
using ZB.MOM.WW.ScadaBridge.CentralUI.Auth;
using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Pages.Monitoring;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
using ZB.MOM.WW.ScadaBridge.Commons.Messages.RemoteQuery;
using ZB.MOM.WW.ScadaBridge.Communication;

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

/// <summary>Review 2026-10-21 07/M-3 (retained-row cap) and the lane D keyword-window hint.</summary>
public class EventLogsPageTests : BunitContext
{
    private static EventLogEntry Entry(int n) =>
        new($"id-{n}", DateTimeOffset.UnixEpoch.AddSeconds(n), "T", "Info", null, "src", "m", null);

    private static List<EventLogEntry> Page(int from, int count) =>
        Enumerable.Range(from, count).Select(Entry).ToList();

    /// <summary>Rows beyond the cap are dropped from the head and their expansion state cleared.</summary>
    [Fact]
    public void AppendCapped_DropsOldestRowsBeyondCap_AndUnexpandsThem()
    {
        var entries = Page(0, 8);
        var expanded = new HashSet<string> { "id-0", "id-7" };

        var dropped = EventLogs.AppendCapped(entries, Page(8, 4), expanded, cap: 10);

        Assert.Equal(2, dropped);
        Assert.Equal(10, entries.Count);
        Assert.Equal("id-2", entries[0].Id);
        Assert.Equal("id-11", entries[^1].Id);
        Assert.DoesNotContain("id-0", expanded);
        Assert.Contains("id-7", expanded);
    }

    /// <summary>Under the cap nothing is dropped.</summary>
    [Fact]
    public void AppendCapped_UnderCap_KeepsEverything()
    {
        var entries = Page(0, 3);
        Assert.Equal(0, EventLogs.AppendCapped(entries, Page(3, 3), new HashSet<string>(), cap: 10));
        Assert.Equal(6, entries.Count);
    }

    /// <summary>The page tells operators the keyword search window is bounded.</summary>
    [Fact]
    public void Page_ShowsKeywordWindowHint()
    {
        var identity = new ClaimsIdentity(new[] { new Claim(ClaimTypes.Name, "u") }, "T");
        var auth = Substitute.For<AuthenticationStateProvider>();
        auth.GetAuthenticationStateAsync().Returns(new AuthenticationState(new ClaimsPrincipal(identity)));
        Services.AddSingleton(auth);
        Services.AddScoped(_ => new SiteScopeService(auth));
        var siteRepo = Substitute.For<ISiteRepository>();
        siteRepo.GetAllSitesAsync().Returns(new List<Site>());
        Services.AddSingleton(siteRepo);
        Services.AddSingleton(new CommunicationService(
            Options.Create(new CommunicationOptions()), NullLogger<CommunicationService>.Instance));

        var cut = Render<EventLogs>();

        Assert.Contains("at most the last 7 days", cut.Markup);
    }
}