# nginx for the docker stack. ${DOMAIN} is filled at container start (envsubst,
# limited to DOMAIN via NGINX_ENVSUBST_FILTER). Port 80 serves the ACME
# http-01 challenge and redirects everything else to HTTPS; port 443 serves the
# SPA + reverse-proxies the API. Certs come from the shared volume, issued/renewed
# by the acme.sh sidecar (a self-signed cert bootstraps 443 before the real one).

# ---- 80: ACME challenge + redirect to HTTPS ----
server {
    listen 80;
    listen [::]:80;
    server_name ${DOMAIN};

    # acme.sh writes http-01 challenge files here (shared volume).
    location ^~ /.well-known/acme-challenge/ {
        root /var/www/acme;
        default_type "text/plain";
    }
    location / {
        return 301 https://$host$request_uri;
    }
}

# ---- 443: the app ----
server {
    listen 443 ssl;
    listen [::]:443 ssl;
    http2 on;
    server_name ${DOMAIN};

    ssl_certificate     /etc/nginx/certs/live/${DOMAIN}/fullchain.pem;
    ssl_certificate_key /etc/nginx/certs/live/${DOMAIN}/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_session_cache shared:SSL:10m;

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

    client_max_body_size 50m;

    # Proxy headers (inherited by all proxy_pass locations below).
    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;

    # video / large-image generation can block minutes — avoid the 60s 504.
    proxy_connect_timeout 600s;
    proxy_send_timeout 600s;
    proxy_read_timeout 600s;

    # Hashed build assets never change — cache hard.
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    # SPA fallback; index.html must never be cached (else stale bundle hash).
    location / {
        try_files $uri $uri/ /index.html;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # ---- API / media / health -> backend ----
    # 动态 API no-store,防止 CDN 缓存 GET 响应(如 managed-models)→ 改价不生效。
    location ^~ /admin/api/ { proxy_pass http://backend:6666; add_header Cache-Control "no-store" always; }
    location ^~ /images/    { proxy_pass http://backend:6666; }
    location = /health      { proxy_pass http://backend:6666; }

    # /v1 is per-API-key authenticated — must NOT be cached by any CDN/proxy.
    location ^~ /v1/ {
        proxy_pass http://backend:6666;
        add_header Cache-Control "no-store" always;
    }
}