# Redirect all HTTP to HTTPS, except ACME challenges (certbot renewal)
server {
  listen 80;
  server_name goodwalk.co.nz www.goodwalk.co.nz;

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

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

server {
  listen 443 ssl;
  server_name goodwalk.co.nz www.goodwalk.co.nz;

  ssl_certificate     /etc/letsencrypt/live/goodwalk.co.nz/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/goodwalk.co.nz/privkey.pem;
  ssl_protocols       TLSv1.2 TLSv1.3;
  ssl_ciphers         HIGH:!aNULL:!MD5;

  add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
  add_header X-Frame-Options SAMEORIGIN always;
  add_header X-Content-Type-Options nosniff always;
  add_header Referrer-Policy strict-origin-when-cross-origin always;

  gzip on;
  gzip_types text/plain text/css application/javascript application/json image/svg+xml;

  # Served when the SvelteKit upstream is unreachable (deploys, restarts).
  # Mounted into the nginx container at /var/www/html/maintenance.html.
  location = /maintenance.html {
    root /var/www/html;
    internal;
    add_header Cache-Control "no-store" always;
  }

  location /api/submit {
    proxy_pass http://mail-api:8000/submit;
    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_intercept_errors on;
    proxy_connect_timeout 2s;
    error_page 502 503 504 = /maintenance.html;
  }

  location / {
    proxy_pass http://app:3000;
    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 Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";

    # Serve a static maintenance page when the app container is down/restarting,
    # rather than nginx's default 502/503. The `=` keeps the original status
    # code so search engines treat it as a transient outage, not a real page.
    proxy_intercept_errors on;
    proxy_connect_timeout 2s;
    proxy_next_upstream error timeout http_502 http_503 http_504;
    error_page 502 503 504 = /maintenance.html;
  }
}