server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # API requests when accessed via Caddy (prefix already stripped by handle_path)
    location /api/ {
        proxy_pass http://api:8522;
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $http_x_real_ip;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
        proxy_set_header X-CF-Session $http_x_cf_session;
        client_max_body_size 50m;
        # PDF uploads and LLM inference can be slow
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
    }

    # API requests when accessed directly via pagepiper.circuitforge.tech
    # VITE_API_BASE=/pagepiper means frontend builds calls as /pagepiper/api/...
    # Caddy passes these unchanged; nginx strips /pagepiper prefix here.
    location /pagepiper/api/ {
        rewrite ^/pagepiper(/api/.*)$ $1 break;
        proxy_pass http://api:8522;
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $http_x_real_ip;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
        proxy_set_header X-CF-Session $http_x_cf_session;
        client_max_body_size 50m;
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
    }

    # Static assets at the /pagepiper/ base — used when Caddy does NOT strip the prefix
    # (i.e., pagepiper.circuitforge.tech routes, where /pagepiper is the Vite base URL).
    # ^~ prevents regex asset location from matching first.
    location ^~ /pagepiper/ {
        alias /usr/share/nginx/html/;
        try_files $uri $uri/ /index.html;
    }

    location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        try_files $uri /index.html;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }

    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2?)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
}