using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Prefab.Handler;
using Prefab.Web.Data;

namespace Prefab.Tests.Infrastructure;

/// <summary>
/// Spins up Aspire infrastructure plus the Prefab web and catalog apps in-process.
/// </summary>
public class PrefabCompositeFixture : IAsyncLifetime
{
    public const int DebugPrefabPort = 5173;
    public const int DebugCatalogPort = 5174;

    private readonly PrefabHarnessOptions _options;
    private readonly TestAuthenticationStateProvider _authenticationProvider = new();

    protected PrefabCompositeFixture(PrefabHarnessOptions? options = null)
    {
        _options = options ?? ResolveDefaultOptions();
        Infra = new AspireInfraHost(_options, "prefab-db");
    }

    public AspireInfraHost Infra { get; }
    public KestrelInProcApp<Prefab.Web.Module> PrefabWeb { get; private set; } = default!;
    public KestrelInProcApp<Prefab.Catalog.Api.Module>? CatalogApi { get; private set; }
    public TestAuthenticationStateProvider AuthenticationStateProvider => _authenticationProvider;

    public Uri PrefabBaseAddress => PrefabWeb.HttpAddress;
    public Uri CatalogBaseAddress => CatalogApi?.HttpAddress ?? throw new InvalidOperationException("Catalog API has not been started.");

    protected virtual bool ShouldStartCatalog => true;

    public async ValueTask InitializeAsync()
    {
        await Infra.InitializeAsync();
        await EnsureDatabaseInitialized(CancellationToken.None);

        var prefabProject = Infra.GetProject("prefab-web");
        var useFixedPorts = _options.Mode == RunMode.DebugPersistent && _options.DisablePortRandomization;

        Uri? catalogAddress = null;
        if (ShouldStartCatalog)
        {
            var catalogProject = Infra.GetProject("prefab-catalog");
            var catalogPort = useFixedPorts ? DebugCatalogPort : (int?)null;
            CatalogApi = new KestrelInProcApp<Prefab.Catalog.Api.Module>(
                Infra,
                catalogProject,
                catalogPort,
                overrides: null,
                configureServices: ConfigureCatalogServices);

            await CatalogApi.InitializeAsync();
            catalogAddress = CatalogApi.HttpAddress;
        }
        else
        {
            CatalogApi = null;
        }

        var overrides = GetWebOverrides(catalogAddress);

        var prefabPort = useFixedPorts ? DebugPrefabPort : (int?)null;
        PrefabWeb = new KestrelInProcApp<Prefab.Web.Module>(
            Infra,
            prefabProject,
            prefabPort,
            overrides,
            ConfigureWebServices);

        await PrefabWeb.InitializeAsync();
    }

    public async ValueTask DisposeAsync()
    {
        await Infra.DisposeAsync();
    }

    public HttpClient CreateHttpClientForWeb() => PrefabWeb.CreateClient();

    public IServiceScope CreateWebScope() => PrefabWeb.AppServices.CreateScope();

    public async Task<string> GetConnectionStringAsync(string resourceName, CancellationToken cancellationToken = default) =>
        await Infra.GetConnectionStringAsync(resourceName, cancellationToken);

    public async Task SeedAsync(Func<AppDb, CancellationToken, Task> seed, CancellationToken cancellationToken = default)
    {
        ArgumentNullException.ThrowIfNull(seed);

        var connectionString = await GetConnectionStringAsync("prefab-db", cancellationToken);
        var optionsBuilder = new DbContextOptionsBuilder<AppDb>().UseSqlServer(connectionString);

        await using var db = new AppDb(optionsBuilder.Options, new HandlerContextAccessor());
        await db.Database.MigrateAsync(cancellationToken);
        await seed(db, cancellationToken);
    }

    protected virtual async ValueTask EnsureDatabaseInitialized(CancellationToken cancellationToken)
    {
        var connectionString = await GetConnectionStringAsync("prefab-db", cancellationToken);
        var optionsBuilder = new DbContextOptionsBuilder<AppDb>().UseSqlServer(connectionString);

        await using var db = new AppDb(optionsBuilder.Options, new HandlerContextAccessor());
        await db.Database.MigrateAsync(cancellationToken);
    }

    protected virtual IDictionary<string, string?> GetWebOverrides(Uri? catalogAddress) =>
        new Dictionary<string, string?>
        {
            ["Prefab__Catalog__Client__Transport"] = "Http",
            ["Prefab__Catalog__Client__BaseAddress"] = catalogAddress?.ToString().TrimEnd('/') ?? string.Empty
        };

    protected void ConfigureTestAuthentication(IServiceCollection services)
    {
        var descriptors = services.Where(d => d.ServiceType == typeof(AuthenticationStateProvider)).ToList();
        foreach (var descriptor in descriptors)
        {
            services.Remove(descriptor);
        }

        services.AddSingleton(_authenticationProvider);
        services.AddSingleton<AuthenticationStateProvider>(_ => _authenticationProvider);
    }

    protected virtual void ConfigureCatalogServices(IServiceCollection services) => ConfigureTestAuthentication(services);

    protected virtual void ConfigureWebServices(IServiceCollection services) => ConfigureTestAuthentication(services);

    private static PrefabHarnessOptions ResolveDefaultOptions()
    {
        var modeEnv = Environment.GetEnvironmentVariable("PREFAB_TEST_MODE")?.Trim().ToLowerInvariant();
        var mode = modeEnv switch
        {
            "debug" => RunMode.DebugPersistent,
            "ephemeral" => RunMode.EphemeralIsolated,
            _ => RunMode.DebugPersistent
        };

        return mode switch
        {
            RunMode.EphemeralIsolated => new PrefabHarnessOptions(
                RunMode.EphemeralIsolated,
                EnableAspireDashboard: false,
                DisablePortRandomization: false),
            _ => new PrefabHarnessOptions(
                RunMode.DebugPersistent,
                EnableAspireDashboard: true,
                DisablePortRandomization: true)
        };
    }
}

public sealed class PrefabCompositeFixture_Debug : PrefabCompositeFixture
{
    public PrefabCompositeFixture_Debug()
        : base(new PrefabHarnessOptions(
            RunMode.DebugPersistent,
            EnableAspireDashboard: true,
            DisablePortRandomization: true))
    {
    }
}

public sealed class PrefabCompositeFixture_Ephemeral : PrefabCompositeFixture
{
    public PrefabCompositeFixture_Ephemeral()
        : base(new PrefabHarnessOptions(
            RunMode.EphemeralIsolated,
            EnableAspireDashboard: false,
            DisablePortRandomization: false))
    {
    }
}

public sealed class PrefabCompositeFixture_InProcess : PrefabCompositeFixture
{
    public PrefabCompositeFixture_InProcess()
        : base(new PrefabHarnessOptions(
            RunMode.DebugPersistent,
            EnableAspireDashboard: true,
            DisablePortRandomization: true))
    {
    }

    protected override bool ShouldStartCatalog => false;

    protected override IDictionary<string, string?> GetWebOverrides(Uri? catalogAddress) =>
        new Dictionary<string, string?>
        {
            ["Prefab__Catalog__Client__Transport"] = "InProcess"
        };
}

public sealed class PrefabCompositeFixture_BffProduct : PrefabCompositeFixture
{
    private Prefab.Shared.Catalog.Products.IProductClient? _productClient;
    private readonly Prefab.Shared.Catalog.Categories.ICategoryClient _categoryClient = new NullCategoryClient();
    private readonly Prefab.Shared.Catalog.Products.IPriceQuoteClient _priceQuoteClient = new NullPriceQuoteClient();

    public PrefabCompositeFixture_BffProduct()
        : base(new PrefabHarnessOptions(
            RunMode.DebugPersistent,
            EnableAspireDashboard: true,
            DisablePortRandomization: true))
    {
    }

    public void UseProductClient(Prefab.Shared.Catalog.Products.IProductClient client)
    {
        _productClient = client ?? throw new ArgumentNullException(nameof(client));
    }

    protected override bool ShouldStartCatalog => false;

    protected override IDictionary<string, string?> GetWebOverrides(Uri? catalogAddress) =>
        new Dictionary<string, string?>
        {
            ["Prefab__Catalog__Client__Transport"] = "InProcess"
        };

    protected override void ConfigureWebServices(IServiceCollection services)
    {
        base.ConfigureWebServices(services);

        services.RemoveAll<Prefab.Shared.Catalog.IModuleClient>();
        services.RemoveAll<Prefab.Shared.Catalog.Categories.ICategoryClient>();
        services.RemoveAll<Prefab.Shared.Catalog.Products.IProductClient>();
        services.RemoveAll<Prefab.Shared.Catalog.Products.IPriceQuoteClient>();

        services.AddScoped<Prefab.Shared.Catalog.Categories.ICategoryClient>(_ => _categoryClient);
        services.AddScoped<Prefab.Shared.Catalog.Products.IPriceQuoteClient>(_ => _priceQuoteClient);
        services.AddScoped<Prefab.Shared.Catalog.Products.IProductClient>(_ =>
            _productClient ?? throw new InvalidOperationException("Test product client has not been configured."));
        services.AddScoped<Prefab.Shared.Catalog.IModuleClient>(sp =>
            new Prefab.Catalog.ModuleClient(
                sp.GetRequiredService<Prefab.Shared.Catalog.Categories.ICategoryClient>(),
                sp.GetRequiredService<Prefab.Shared.Catalog.Products.IProductClient>(),
                sp.GetRequiredService<Prefab.Shared.Catalog.Products.IPriceQuoteClient>()));
    }

    private sealed class NullCategoryClient : Prefab.Shared.Catalog.Categories.ICategoryClient
    {
        public Task<Prefab.Shared.Catalog.Categories.GetCategories.Response> GetCategories(
            CancellationToken cancellationToken) =>
            throw new NotSupportedException("Category retrieval is not configured for this test.");

        public Task<Prefab.Shared.Catalog.Categories.CreateCategory.Response> CreateCategory(
            Prefab.Shared.Catalog.Categories.CreateCategory.Request request,
            CancellationToken cancellationToken) =>
            throw new NotSupportedException("Category creation is not configured for this test.");
    }

    private sealed class NullPriceQuoteClient : Prefab.Shared.Catalog.Products.IPriceQuoteClient
    {
        public Task<Prefab.Shared.Catalog.Products.QuotePrice.Response> Quote(
            Prefab.Shared.Catalog.Products.QuotePrice.Request request,
            CancellationToken cancellationToken) =>
            throw new NotSupportedException("Price quote client is not configured for this test.");

        public Task<Prefab.Shared.Catalog.Products.QuotePrice.Response> QuotePrice(
            Prefab.Shared.Catalog.Products.QuotePrice.Request request,
            CancellationToken cancellationToken) =>
            throw new NotSupportedException("Price quote client is not configured for this test.");
    }
}

[CollectionDefinition("Prefab.Debug")]
public sealed class PrefabDebugCollection : ICollectionFixture<PrefabCompositeFixture_Debug>
{
}

[CollectionDefinition("Prefab.Ephemeral")]
public sealed class PrefabEphemeralCollection : ICollectionFixture<PrefabCompositeFixture_Ephemeral>
{
}

[CollectionDefinition("Prefab.InProcess")]
public sealed class PrefabInProcessCollection : ICollectionFixture<PrefabCompositeFixture_InProcess>
{
}

[CollectionDefinition("Prefab.BffProduct")]
public sealed class PrefabBffProductCollection : ICollectionFixture<PrefabCompositeFixture_BffProduct>
{
}