# ===================================================================
# Nginx Host-Level Konfiguration für Proxmox-Server
# Meldestelle Project - Reverse Proxy Setup
# ===================================================================
# Installation auf Proxmox:
#   sudo cp meldestelle.conf /etc/nginx/sites-available/
#   sudo ln -s /etc/nginx/sites-available/meldestelle.conf /etc/nginx/sites-enabled/
#   sudo nginx -t && sudo systemctl reload nginx
# ===================================================================

# Upstream-Definitionen für Container-Services
upstream meldestelle-web-app {
    server localhost:4000;
}

upstream meldestelle-desktop-vnc {
    server localhost:6080;
}

upstream meldestelle-api-gateway {
    server localhost:8081;
}

# ===================================================================
# Web-App (Hauptanwendung)
# ===================================================================
server {
    listen 80;
    server_name meldestelle.yourdomain.com;

    # Security Headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Logging
    access_log /var/log/nginx/meldestelle-web.access.log;
    error_log /var/log/nginx/meldestelle-web.error.log;

    # Reverse Proxy zur Web-App
    location / {
        proxy_pass http://meldestelle-web-app;
        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_set_header X-Forwarded-Host $server_name;

        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # Buffering
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 8 4k;
    }

    # Health-Check Endpoint
    location /health {
        proxy_pass http://meldestelle-web-app/health;
        access_log off;
    }
}

# ===================================================================
# Desktop-VNC (noVNC Web-Interface)
# ===================================================================
server {
    listen 80;
    server_name vnc.meldestelle.yourdomain.com;

    # Logging
    access_log /var/log/nginx/meldestelle-vnc.access.log;
    error_log /var/log/nginx/meldestelle-vnc.error.log;

    # Reverse Proxy zum VNC-Container
    location / {
        proxy_pass http://meldestelle-desktop-vnc;
        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;

        # WebSocket Support für noVNC
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Origin "";

        # VNC-spezifische Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 3600s;
        proxy_read_timeout 3600s;

        # Buffering deaktivieren für Real-time
        proxy_buffering off;
    }
}

# ===================================================================
# API-Gateway (Direkter Zugriff)
# ===================================================================
server {
    listen 80;
    server_name api.meldestelle.yourdomain.com;

    # Logging
    access_log /var/log/nginx/meldestelle-api.access.log;
    error_log /var/log/nginx/meldestelle-api.error.log;

    # CORS Headers für API-Zugriff
    add_header Access-Control-Allow-Origin "*" always;
    add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
    add_header Access-Control-Allow-Headers "Content-Type, Authorization, X-Requested-With" always;

    # Reverse Proxy zum API-Gateway
    location / {
        # Handle preflight requests
        if ($request_method = 'OPTIONS') {
            add_header Access-Control-Allow-Origin "*";
            add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS";
            add_header Access-Control-Allow-Headers "Content-Type, Authorization, X-Requested-With";
            add_header Access-Control-Max-Age 86400;
            add_header Content-Length 0;
            add_header Content-Type text/plain;
            return 204;
        }

        proxy_pass http://meldestelle-api-gateway;
        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;

        # API-spezifische Timeouts
        proxy_connect_timeout 30s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # Health-Check Endpoint
    location /actuator/health {
        proxy_pass http://meldestelle-api-gateway/actuator/health;
        access_log off;
    }
}

# ===================================================================
# SSL/HTTPS Konfiguration (Optional - für Cloudflare)
# ===================================================================
# Uncomment für HTTPS mit Let's Encrypt oder Cloudflare:
#
# server {
#     listen 443 ssl http2;
#     server_name meldestelle.yourdomain.com;
#
#     ssl_certificate /etc/ssl/certs/meldestelle.crt;
#     ssl_certificate_key /etc/ssl/private/meldestelle.key;
#
#     # SSL Configuration
#     ssl_protocols TLSv1.2 TLSv1.3;
#     ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512;
#     ssl_prefer_server_ciphers off;
#     ssl_session_cache shared:SSL:10m;
#
#     # Rest der Web-App Konfiguration hier...
# }

# ===================================================================
# HTTP -> HTTPS Redirect (Optional)
# ===================================================================
# Uncomment für automatische HTTPS-Weiterleitung:
#
# server {
#     listen 80;
#     server_name meldestelle.yourdomain.com vnc.meldestelle.yourdomain.com api.meldestelle.yourdomain.com;
#     return 301 https://$server_name$request_uri;
# }