# Serves the built Angular bundle and reverse-proxies the API, so the browser
# sees a single origin and never makes a cross-origin request.

server {
    listen 8080;
    server_name _;

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

    # Client uploads are capped server-side too; this stops oversized bodies
    # from being buffered all the way to the API first.
    client_max_body_size 6m;

    gzip on;
    gzip_types text/css application/javascript application/json image/svg+xml;
    gzip_min_length 1024;

    # Do not advertise the exact nginx version.
    server_tokens off;

    include /etc/nginx/snippets/security-headers.conf;

    # Hashed build assets are immutable, so they can be cached hard.
    location ~* \.(?:js|css|woff2?|ttf|eot|svg|png|jpg|jpeg|gif|webp|ico)$ {
        include /etc/nginx/snippets/security-headers.conf;
        # add_header alone, not `expires`: using both emits two Cache-Control
        # headers with overlapping directives.
        add_header Cache-Control "public, max-age=31536000, immutable" always;
        try_files $uri =404;
    }

    location /api/ {
        proxy_pass http://api:8080;
        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;
    }

    # Uploaded box art, served straight off the API's volume.
    #
    # `^~` matters: without it, a regex location wins over a prefix location, so
    # /uploads/<id>/<name>.webp would fall into the static-asset block above and
    # 404 against nginx's own filesystem instead of being proxied.
    location ^~ /uploads/ {
        include /etc/nginx/snippets/security-headers.conf;
        proxy_pass http://api:8080;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        add_header Cache-Control "public, max-age=2592000" always;
    }

    location /health {
        proxy_pass http://api:8080/health;
    }

    # index.html must never be cached, or clients keep booting old bundles.
    # Declared before `location /` so the internal rewrite below lands here.
    location = /index.html {
        include /etc/nginx/snippets/security-headers.conf;
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;
    }

    # Angular owns routing: any unknown path returns index.html so a deep link
    # or a refresh on /games/12 does not 404.
    location / {
        try_files $uri $uri/ /index.html;
    }
}