upstream frontend_upstream {
    server frontend:80;
    keepalive 16;
}

upstream backend_upstream {
    server backend:8000;
    keepalive 16;
}

server {
    listen 80;
    server_name _;

    server_tokens off;

    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;

    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_set_header X-Forwarded-Host $host;
    proxy_set_header Connection "";
    proxy_read_timeout 60s;
    proxy_send_timeout 60s;

    location ^~ /api/ {
        add_header Cache-Control "no-store" always;
        add_header X-Frame-Options "DENY" always;
        add_header Cross-Origin-Resource-Policy "same-site" always;
        proxy_pass http://backend_upstream/api/;
    }

    location = /docs {
        add_header Cache-Control "no-store" always;
        add_header Content-Security-Policy "default-src 'self'; img-src 'self' data: https:; style-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net; script-src 'self' https://cdn.jsdelivr.net; frame-ancestors 'none'; base-uri 'self'; form-action 'self'" always;
        add_header X-Frame-Options "DENY" always;
        proxy_pass http://backend_upstream/docs;
    }

    location = /openapi.json {
        add_header Cache-Control "no-store" always;
        proxy_pass http://backend_upstream/openapi.json;
    }

    location = /redoc {
        add_header Cache-Control "no-store" always;
        add_header Content-Security-Policy "default-src 'self'; img-src 'self' data: https:; style-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net; script-src 'self' https://cdn.jsdelivr.net; frame-ancestors 'none'; base-uri 'self'; form-action 'self'" always;
        add_header X-Frame-Options "DENY" always;
        proxy_pass http://backend_upstream/redoc;
    }

    location ~* \.(?:css|js|mjs|png|jpg|jpeg|gif|svg|ico|webp|woff2?)$ {
        proxy_pass http://frontend_upstream;
        add_header Cache-Control "public, max-age=31536000, immutable" always;
    }

    location / {
        proxy_pass http://frontend_upstream;
        add_header Cache-Control "no-store, no-cache" always;
    }
}