using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;
using ScadaLink.Commons.Interfaces.Transport;
using ScadaLink.Transport.Encryption;
using ScadaLink.Transport.Export;
using ScadaLink.Transport.Import;
using ScadaLink.Transport.Serialization;

namespace ScadaLink.Transport;

public static class ServiceCollectionExtensions
{
    public const string OptionsSection = "ScadaLink:Transport";

    public static IServiceCollection AddTransport(this IServiceCollection services)
    {
        ArgumentNullException.ThrowIfNull(services);
        services.AddOptions<TransportOptions>().BindConfiguration(OptionsSection);
        services.TryAddSingleton(TimeProvider.System);

        // Pipeline building blocks: stateless services live as singletons; the
        // resolver and exporter are scoped because they reach into per-request
        // repository scopes and the scoped DbContext.
        services.AddSingleton<BundleSecretEncryptor>();
        services.AddSingleton<ManifestBuilder>();
        services.AddSingleton<ManifestValidator>();
        services.AddSingleton<BundleSerializer>();
        services.AddSingleton<EntitySerializer>();
        services.AddScoped<DependencyResolver>();
        services.AddScoped<IBundleExporter, BundleExporter>();
        services.AddSingleton<IBundleSessionStore, BundleSessionStore>();
        // Remaining concrete services added in later tasks.
        return services;
    }
}