limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
limit_req_zone $binary_remote_addr zone=login:10m rate=5r/s;

upstream nextjs {
    server app:3000;
    keepalive 32;
}

server {
    listen 80;
    server_name rf-flux.com www.rf-flux.com;

    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    location / {
        return 301 https://$host$request_uri;
    }
}

server {
    listen 443 ssl;
    http2 on;
    client_max_body_size 500M;
    server_name rf-flux.com www.rf-flux.com;

    ssl_certificate /etc/letsencrypt/live/rf-flux.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/rf-flux.com/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:10m;
    ssl_session_tickets off;

    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;

    # Next.js bundles use content hashing — safe to cache forever
    location /_next/static/ {
        proxy_pass http://nextjs;
        expires 365d;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # Next.js image optimizer — short cache, browser revalidates
    location /_next/image {
        proxy_pass http://nextjs;
        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_cache_bypass $http_upgrade;
        add_header Cache-Control "public, max-age=300, must-revalidate" always;
    }

    location /hq-command/login {
        limit_req zone=login burst=10 nodelay;
        proxy_pass http://nextjs;
        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;
    }

# Asset uploads (large files, long timeout)
    location /api/assets {
        client_max_body_size 500M;
        proxy_pass http://nextjs;
        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;
        proxy_send_timeout 600s;
        proxy_request_buffering off;
    }

    location /api/public-upload {
        client_max_body_size 500M;
        proxy_pass http://nextjs;
        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;
        proxy_send_timeout 600s;
        proxy_request_buffering off;
    }   

    location /hq-command/ {
        proxy_pass http://nextjs;
        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;
    }

    location /api/chat {
        limit_req zone=api burst=20 nodelay;
        proxy_pass http://nextjs;
        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_http_version 1.1;
        proxy_set_header Connection '';
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 120s;
    }

    location /api/health {
        proxy_pass http://nextjs;
        access_log off;
    }
    
    # ─────────────────────────────────────────────────────────────────
    # User-uploaded assets — served directly from disk (bypass Next.js)
    #
    # Cache strategy: short max-age + must-revalidate.
    # Browser caches for 5 minutes, then asks Nginx "did this change?"
    # via If-Modified-Since. Nginx auto-replies 304 (Not Modified) if the
    # file's mtime is unchanged, or serves the new file if it changed.
    # This means new CMS uploads appear within ~5 min without rebuild
    # AND saved bandwidth on unchanged files.
    # ─────────────────────────────────────────────────────────────────

    location /cases/ {
        alias /srv/cases/;
        add_header Cache-Control "public, max-age=300, must-revalidate" always;
        access_log off;
    }

    location /applications/ {
        alias /srv/applications/;
        add_header Cache-Control "public, max-age=300, must-revalidate" always;
        access_log off;
    }

    location /news/ {
        alias /srv/news/;
        add_header Cache-Control "public, max-age=300, must-revalidate" always;
        access_log off;
    }

    location /parts/ {
        alias /srv/parts/;
        add_header Cache-Control "public, max-age=300, must-revalidate" always;
        access_log off;
    }

    location /operations-inbox/ {
        alias /srv/operations-inbox/;
        add_header Cache-Control "private, max-age=60, must-revalidate" always;
        access_log off;
    }

    location /footage/ {
        alias /srv/footage/;
        add_header Cache-Control "public, max-age=300, must-revalidate" always;
        access_log off;
    }

    location /branding/ {
        alias /srv/branding/;
        add_header Cache-Control "public, max-age=300, must-revalidate" always;
        access_log off;
    }

    location / {
        proxy_pass http://nextjs;
        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_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}