using System.Security.Claims;
using Bunit;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using NSubstitute;
using ScadaLink.CentralUI.Components.Shared;
using ScadaLink.Commons.Entities.Sites;
using ScadaLink.Commons.Interfaces.Repositories;
using ScadaLink.Commons.Interfaces.Services;
using ScadaLink.Communication;
using ScadaLink.DeploymentManager;
using SitesPage = ScadaLink.CentralUI.Components.Pages.Admin.Sites;

namespace ScadaLink.CentralUI.Tests.Admin;

/// <summary>
/// Regression tests for CentralUI-012. The Sites page loaded all sites and then
/// issued <c>GetDataConnectionsBySiteIdAsync</c> once per site (N+1 database
/// round-trips on every load and post-delete refresh). The fix fetches all
/// data connections in a single <c>GetAllDataConnectionsAsync</c> call and
/// groups them client-side.
/// </summary>
public class SitesPageTests : BunitContext
{
    private readonly ISiteRepository _siteRepo = Substitute.For<ISiteRepository>();

    private void RegisterServices()
    {
        Services.AddSingleton(_siteRepo);

        var comms = new CommunicationService(
            Options.Create(new CommunicationOptions()),
            NullLogger<CommunicationService>.Instance);
        Services.AddSingleton(comms);

        var artifactSvc = new ArtifactDeploymentService(
            _siteRepo,
            Substitute.For<IDeploymentManagerRepository>(),
            Substitute.For<ITemplateEngineRepository>(),
            Substitute.For<IExternalSystemRepository>(),
            Substitute.For<INotificationRepository>(),
            comms,
            Substitute.For<IAuditService>(),
            Options.Create(new DeploymentManagerOptions()),
            NullLogger<ArtifactDeploymentService>.Instance);
        Services.AddSingleton(artifactSvc);

        Services.AddSingleton<IDialogService>(Substitute.For<IDialogService>());

        var identity = new ClaimsIdentity(
            new[] { new Claim(ClaimTypes.Name, "admin") }, "TestCookie");
        var authState = new AuthenticationState(new ClaimsPrincipal(identity));
        Services.AddSingleton<AuthenticationStateProvider>(
            new StubAuthStateProvider(authState));
    }

    private sealed class StubAuthStateProvider : AuthenticationStateProvider
    {
        private readonly AuthenticationState _state;
        public StubAuthStateProvider(AuthenticationState state) => _state = state;
        public override Task<AuthenticationState> GetAuthenticationStateAsync()
            => Task.FromResult(_state);
    }

    private static List<Site> Sites(params int[] ids)
        => ids.Select(id => new Site($"Site{id}", $"SITE-{id}") { Id = id }).ToList();

    private static DataConnection Conn(int siteId, string name)
        => new(name, "OpcUa", siteId);

    [Fact]
    public void LoadData_FetchesAllConnectionsInOneQuery_NoPerSiteQueries()
    {
        RegisterServices();
        _siteRepo.GetAllSitesAsync().Returns(Sites(1, 2, 3));
        _siteRepo.GetAllDataConnectionsAsync().Returns(new List<DataConnection>
        {
            Conn(1, "c1"), Conn(2, "c2"), Conn(3, "c3"),
        });

        Render<SitesPage>();

        // Regression: exactly one bulk query, and zero per-site queries.
        _siteRepo.Received(1).GetAllDataConnectionsAsync();
        _siteRepo.DidNotReceive().GetDataConnectionsBySiteIdAsync(Arg.Any<int>());
    }

    [Fact]
    public void LoadData_GroupsConnectionsBySite_AndRendersThem()
    {
        RegisterServices();
        _siteRepo.GetAllSitesAsync().Returns(Sites(1, 2));
        _siteRepo.GetAllDataConnectionsAsync().Returns(new List<DataConnection>
        {
            Conn(1, "alpha-conn"), Conn(2, "beta-conn"),
        });

        var cut = Render<SitesPage>();

        Assert.Contains("alpha-conn", cut.Markup);
        Assert.Contains("beta-conn", cut.Markup);
    }
}