using Microsoft.Azure.Functions.Worker;           // ← SWAP: remove for AspNetCore
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Identity.Web;
using Registration.Data;
using Registration.Mock;

// ─────────────────────────────────────────────────────────────────────────────
// Shared service registrations — identical in both hosting modes.
// Never changes regardless of which block is active below.
// ─────────────────────────────────────────────────────────────────────────────
void ConfigureServices(IServiceCollection services, IConfiguration config)
{
    // JWT authentication — Entra External ID (CIAM)
    // Validates Bearer tokens issued by usimclients.ciamlogin.com.
    // AzureAd config comes from local.settings.json (Functions) or
    // appsettings.json / environment variables (AspNetCore).
    services.AddAuthentication()
        .AddMicrosoftIdentityWebApi(config.GetSection("AzureAd"));

    services.AddAuthorization();

    // Data layer — swap between MockDataService (no DB) and SqlDataService (dbRegistration).
    // MockDataService:  no connection string required, seeds 4 test applicants.
    // SqlDataService:   requires ConnectionStrings:Sql pointed at dbRegistration.
    //                   Calls dbo.spRegistration with @action/@rqst/@resp OUTPUT pattern.
    services.AddSingleton<SqlService>();
    services.AddSingleton<IRegistrationDataService, SqlDataService>();
    // ── swap data layer here if needed ──────────────────────────────────────
    // services.AddSingleton<IRegistrationDataService, MockDataService>();
}

// ═════════════════════════════════════════════════════════════════════════════
// SWAP: Azure Functions host
// Active when deployed to Azure Functions or running via: func start
// ═════════════════════════════════════════════════════════════════════════════
var host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
    .ConfigureServices((ctx, services) =>
    {
        services.AddApplicationInsightsTelemetryWorkerService();
        services.ConfigureFunctionsApplicationInsights();
        ConfigureServices(services, ctx.Configuration);
    })
    .Build();

host.Run();

// ═════════════════════════════════════════════════════════════════════════════
// SWAP: ASP.NET Core host
// Active when running in podman-compose or dotnet run (self-hosted).
// Also update RegistrationFunctions.cs and Registration.csproj.
// ═════════════════════════════════════════════════════════════════════════════
// var builder = WebApplication.CreateBuilder(args);
// 
// ConfigureServices(builder.Services, builder.Configuration);
// builder.Services.AddControllers();
// 
// // CORS — replace with actual client origin in production
// builder.Services.AddCors(options => options.AddDefaultPolicy(policy =>
//     policy.WithOrigins(
//             builder.Configuration["Cors:AllowedOrigin"] ?? "http://localhost:3001"
//         )
//         .AllowAnyHeader()
//         .AllowAnyMethod()));
// 
// var app = builder.Build();
// 
// app.UseCors();
// app.UseAuthentication();
// app.UseAuthorization();
// app.MapControllers();
// 
// await app.RunAsync();
// ─────────────────────────────────────────────────────────────────────────────