using System;
using System.Collections.Generic;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using StellaOps.Cryptography;
using StellaOps.Cryptography.PluginLoader;

namespace StellaOps.Cryptography.DependencyInjection;

/// <summary>
/// DI extension methods for configuration-driven crypto plugin loading.
/// </summary>
public static partial class CryptoPluginServiceCollectionExtensions
{
    /// <summary>
    /// Registers crypto providers using configuration-driven plugin loading.
    /// Replaces hardcoded provider registrations with dynamic plugin loader.
    /// </summary>
    /// <param name="services">Service collection.</param>
    /// <param name="configuration">Application configuration.</param>
    /// <param name="configurePlugins">Optional plugin configuration action.</param>
    /// <returns>The service collection.</returns>
    public static IServiceCollection AddStellaOpsCryptoWithPlugins(
        this IServiceCollection services,
        IConfiguration configuration,
        Action<CryptoPluginConfiguration>? configurePlugins = null)
    {
        ArgumentNullException.ThrowIfNull(services);
        ArgumentNullException.ThrowIfNull(configuration);

        CryptoComplianceOptionsRegistration.Register(services, bindFromConfiguration: false);
        services.Configure<CryptoComplianceOptions>(options =>
        {
            configuration.GetSection(CryptoComplianceOptions.SectionKey).Bind(options);
        });

        services.Configure<CryptoPluginConfiguration>(options =>
        {
            configuration.GetSection("StellaOps:Crypto:Plugins").Bind(options);
            configurePlugins?.Invoke(options);
        });

        services.TryAddSingleton<ICryptoComplianceService, CryptoComplianceService>();
        services.TryAddSingleton<ICryptoHash, DefaultCryptoHash>();
        services.TryAddSingleton<ICryptoHmac, DefaultCryptoHmac>();
        services.TryAddSingleton<IReadOnlyList<ICryptoProvider>, CryptoPluginProviderList>();
        services.TryAddSingleton<IEnumerable<ICryptoProvider>, CryptoPluginProviderEnumerable>();
        services.TryAddSingleton<ICryptoProviderRegistry, CryptoPluginProviderRegistry>();

        return services;
    }
}