using Marathon.Application.Abstractions;
using Marathon.Application.Configuration;
using Marathon.Infrastructure.Configuration;
using Marathon.Infrastructure.Notifications;
using Marathon.Infrastructure.Persistence;
using Marathon.Infrastructure.Scraping;
using Marathon.Infrastructure.Workers;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace Marathon.Infrastructure;

/// <summary>
/// Top-level DI composition entry-point for all Infrastructure sub-modules
/// (Persistence, Scraping, Workers).
/// </summary>
/// <remarks>
/// Call <see cref="AddMarathonInfrastructure"/> once from the host's DI
/// setup. This replaces the previous reflection-based wiring in
/// <c>App.xaml.cs::TryAddApplicationAndInfrastructure</c>.
/// </remarks>
public static class InfrastructureModule
{
    /// <summary>
    /// Registers the complete Infrastructure layer:
    /// <list type="bullet">
    ///   <item>EF Core / SQLite persistence (<see cref="PersistenceModule.AddMarathonPersistence"/>).</item>
    ///   <item>HttpClient + AngleSharp + Polly scraping (<see cref="ScrapingModule.AddMarathonScraping"/>).</item>
    ///   <item><see cref="WorkerOptions"/> bound to the <c>Workers</c> config section.</item>
    ///   <item>Three <see cref="Microsoft.Extensions.Hosting.BackgroundService"/> pollers.</item>
    /// </list>
    /// </summary>
    public static IServiceCollection AddMarathonInfrastructure(
        this IServiceCollection services,
        IConfiguration config)
    {
        ArgumentNullException.ThrowIfNull(services);
        ArgumentNullException.ThrowIfNull(config);

        services.AddMarathonPersistence(config);
        services.AddMarathonScraping(config);

        services
            .AddOptions<WorkerOptions>()
            .Bind(config.GetSection(WorkerOptions.SectionName));

        services
            .AddOptions<AnomalyOptions>()
            .Bind(config.GetSection(AnomalyOptions.SectionName));

        services
            .AddOptions<ScrapingThrottle>()
            .Bind(config.GetSection(ScrapingThrottle.SectionName));

        services
            .AddOptions<NotificationOptions>()
            .Bind(config.GetSection(NotificationOptions.SectionName));

        services.AddHostedService<UpcomingEventsPoller>();
        services.AddHostedService<LiveOddsPoller>();
        services.AddHostedService<ResultsWatchListPoller>();
        services.AddHostedService<AnomalyDetectionPoller>();

        // Outbound anomaly notifications (Telegram). Sink + dispatcher are always
        // registered; the dispatcher idles until Notifications:Enabled is true and
        // the sink no-ops until a bot token + chat id are configured.
        services.AddHttpClient(TelegramNotificationSink.HttpClientName, client =>
            client.Timeout = TimeSpan.FromSeconds(15));
        services.AddSingleton<INotificationSink, TelegramNotificationSink>();
        services.AddHostedService<AnomalyNotificationDispatcher>();

        return services;
    }
}