# =============================================================
# MPM – Reverse Proxy (Nginx)
# Master has restricted capabilities; workers run as unprivileged user app.
# - /            -> Management-Frontend (SPA, statische Dateien)
# - /api/        -> Management-Backend (127.0.0.1:3000)
# Ab Phase 4 werden hier dynamisch Modul-Routen (/slug) ergänzt.
# =============================================================

worker_processes auto;
user app;
pid /tmp/nginx.pid;
error_log /dev/stderr warn;

events {
  worker_connections 1024;
}

http {
  include /etc/nginx/mime.types;
  default_type application/octet-stream;

  access_log /dev/stdout;
  server_tokens off;

  sendfile on;
  tcp_nopush on;

  # Upload-Grenze (z. B. für Modul-ZIP-Pakete ab Phase 3)
  client_max_body_size 10m;

  gzip on;
  gzip_types text/plain text/css application/javascript application/json image/svg+xml;
  gzip_min_length 1024;

  client_body_temp_path /tmp/nginx/client_body;
  proxy_temp_path /tmp/nginx/proxy;
  fastcgi_temp_path /tmp/nginx/fastcgi;
  uwsgi_temp_path /tmp/nginx/uwsgi;
  scgi_temp_path /tmp/nginx/scgi;

  upstream platform_backend {
    server 127.0.0.1:3000;
  }

  server {
    listen 8080;
    server_name _;

    root /app/public;
    index index.html;

    # Sicherheits-Header
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "DENY" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; connect-src 'self'; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'" always;

    # Gehashte Frontend-Assets: lange cachen
    location /assets/ {
      expires 1y;
      try_files $uri =404;
    }

    # Management-API ans Backend proxien
    # Modulstarts können durch Docker-Builds deutlich länger als 30 Sekunden dauern.
    # Der Client muss auf die Lifecycle-Antwort warten können.
    location /api/v1/modules/ {
      proxy_pass http://platform_backend;
      proxy_http_version 1.1;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_read_timeout 600s;
    }

    # Marketplace-Updates klonen Branches, bauen Images und starten Compose-Stacks.
    # Diese Lifecycle-Antworten können länger als das normale API-Limit dauern.
    location /api/v1/marketplace/modules/ {
      proxy_pass http://platform_backend;
      proxy_http_version 1.1;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_read_timeout 600s;
    }

    location /api/ {
      proxy_pass http://platform_backend;
      proxy_http_version 1.1;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_read_timeout 30s;
    }

    # Next.js benötigt Inline-Skripte für die React-Hydrierung. Die globale
    # Plattform-CSP ohne 'unsafe-inline' würde trotz geladener JS-Dateien
    # alle Client-Handler des Kalendertools blockieren.
    location ~ "^/kalendartool(?<calendar_module_path>/.*)?$" {
      proxy_pass http://platform_backend/api/v1/gateway/kalendartool$calendar_module_path;
      proxy_http_version 1.1;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_read_timeout 60s;
      proxy_hide_header Content-Security-Policy;

      # add_header überschreibt hier die globale Header-Liste; die übrigen
      # Sicherheits-Header deshalb erneut setzen.
      add_header X-Content-Type-Options "nosniff" always;
      add_header X-Frame-Options "DENY" always;
      add_header Referrer-Policy "strict-origin-when-cross-origin" always;
      add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; connect-src 'self'; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'" always;
    }

    # Modul-Routing (Phase 4): /slug/* wird intern an den
    # Modul-Gateway des Backends übergeben (/api/v1/gateway/slug/*).
    # Der Gateway prüft Session, Modul-Status und Berechtigung,
    # bevor der Request an den Modul-Prozess proxied wird.
    # WICHTIG: Plattform-Pfade (api, assets, login, …) sind ausgeschlossen,
    # damit nur echte Modul-Slugs (3–100 Zeichen) weitergeleitet werden.
    location ~ "^/(?!api/|assets/|login|profile|admin|403|404)(?<module_slug>[a-z0-9][a-z0-9-]{2,100})(?<module_path>/.*)?$" {
      proxy_pass http://platform_backend/api/v1/gateway/$module_slug$module_path;
      proxy_http_version 1.1;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_read_timeout 60s;
    }

    # SPA-Fallback für React Router
    location / {
      try_files $uri $uri/ /index.html;
    }
  }
}