using DigitalData.MessagingService.Application.Common.Options;
using FluentValidation;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using System.Reflection;

namespace DigitalData.MessagingService.Application;

/// <summary>
/// Dependency injection configuration for Application layer.
/// </summary>
public static class DependencyInjection
{
    public static IServiceCollection AddApplicationServices(this IServiceCollection services, IConfiguration configuration)
    {
        var assembly = Assembly.GetExecutingAssembly();

        // Read LuckyPennySoft license key from appsettings.json
        var licenseKey = configuration.GetValue<string>("LuckyPennySoftLicenseKey")
            ?? throw new InvalidOperationException("LuckyPennySoftLicenseKey not found in configuration");

        // MediatR - Register all handlers
        services.AddMediatR(config =>
        {
            config.LicenseKey = licenseKey;
            config.RegisterServicesFromAssembly(assembly);
        });

        // AutoMapper - Use built-in DI extension (AutoMapper 16.2.0+)
        services.AddAutoMapper(config =>
        {
            config.LicenseKey = licenseKey;
            config.AddMaps(assembly);
        });

        // FluentValidation - Register all validators
        services.AddValidatorsFromAssembly(assembly);

        // Register EmailAccounts configuration (IOptions<EmailAccountsOptions>)
        services.Configure<EmailAccountsOptions>(configuration.GetSection(EmailAccountsOptions.SectionName));

        return services;
    }
}