DeutschLernen/GermanApp/Program.cs

using GermanApp.Application.DTOs;
using GermanApp.Application.UseCases.Commands;
using GermanApp.Domain.Interfaces;
using GermanApp.Infrastructure.Data.DbContext;
using GermanApp.Infrastructure.Data.Repositories;
using GermanApp.Presentation.Endpoints;
using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
builder.Services.AddOpenApi();

// ============================================
// INFRASTRUCTURE LAYER - Database & External Services
// ============================================

// Add DbContext with SQLite (can be changed to SQL Server, PostgreSQL, etc.)
builder.Services.AddDbContext<AppDbContext>(options =>
{
    // Using SQLite for development - configure in appsettings.json for production
    options.UseSqlite(builder.Configuration.GetConnectionString("DefaultConnection") 
        ?? "Data Source=germanapp.db");
    
    // Enable sensitive data logging in development
    if (builder.Environment.IsDevelopment())
    {
        options.EnableSensitiveDataLogging();
        options.EnableDetailedErrors();
    }
});

// Register repositories (Infrastructure implementations of Domain interfaces)
builder.Services.AddScoped<ILessonRepository, LessonRepository>();

// ============================================
// APPLICATION LAYER - Use Cases & Services
// ============================================

// Register command handlers
builder.Services.AddScoped<ICommandHandler<CreateLessonCommand, LessonDto>, CreateLessonCommandHandler>();

// ============================================
// PRESENTATION LAYER - API
// ============================================

// Add services for Minimal APIs
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.MapOpenApi();
    app.UseSwagger();
    app.UseSwaggerUI();
}

// Initialize database (in development)
if (app.Environment.IsDevelopment())
{
    using var scope = app.Services.CreateScope();
    var dbContext = scope.ServiceProvider.GetRequiredService<AppDbContext>();
    dbContext.Database.EnsureCreated();
}

// Map Clean Architecture endpoints
app.MapLessonsEndpoints();

// Keep original WeatherForecast endpoint for reference
app.MapGet("/weatherforecast", () =>
{
    var summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };
    
    var forecast = Enumerable.Range(1, 5).Select(index =>
        new WeatherForecast
        (
            DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
            Random.Shared.Next(-20, 55),
            summaries[Random.Shared.Next(summaries.Length)]
        ))
        .ToArray();
    return forecast;
})
.WithName("GetWeatherForecast");

app.Run();

// Existing record for reference
record WeatherForecast(DateOnly Date, int TemperatureC, string? Summary)
{
    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
}