Program.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Mvc;
using Microsoft.OpenApi.Models;
using Microsoft.Extensions.Configuration;
using System.IO;

var builder = WebApplication.CreateBuilder(args);

builder.WebHost.ConfigureKestrel(options =>
{
    options.ListenAnyIP(5000); // HTTP
    options.ListenAnyIP(5001, listenOptions => listenOptions.UseHttps()); // HTTPS
});

// ENV-Variablen manuell aus `.env` Datei laden
var envPath = Path.Combine(Directory.GetCurrentDirectory(), ".env");
if (File.Exists(envPath))
{
    foreach (var line in File.ReadAllLines(envPath))
    {
        var parts = line.Split('=', 2);
        if (parts.Length == 2 && !string.IsNullOrWhiteSpace(parts[0]) && !string.IsNullOrWhiteSpace(parts[1]))
        {
            Environment.SetEnvironmentVariable(parts[0], parts[1]);
        }
    }
}

// PostgreSQL-Datenbank konfigurieren
var dbHost = Environment.GetEnvironmentVariable("DB_HOST");
var dbPort = Environment.GetEnvironmentVariable("DB_PORT");
var dbName = Environment.GetEnvironmentVariable("DB_NAME");
var dbUser = Environment.GetEnvironmentVariable("DB_USER");
var dbPassword = Environment.GetEnvironmentVariable("DB_PASSWORD");

var connectionString = $"Host={dbHost};Port={dbPort};Database={dbName};Username={dbUser};Password={dbPassword}";

// Services konfigurieren
builder.Services.ConfigurePostgreSQL(connectionString);
builder.Services.ConfigureCors();
builder.Services.ConfigureRepositories();
builder.Services.ConfigureSwagger();

// Controller aktivieren
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();

var app = builder.Build();

// Fehlerbehandlung vor allen anderen Middleware-Komponenten
app.UseErrorHandling();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();
app.UseCors("AllowAll");
app.UseAuthorization();
app.MapControllers();
app.Run();