# Production frontend: serve the built SPA, proxy /api to the backend container.
# TLS is terminated in front of this (caddy service in docker-compose.prod.yml).
server {
    listen 80;
    listen [::]:80;
    server_name _;

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

    # Uploads are 300-500 MB Amazon exports; the app enforces its own 2 GB cap.
    client_max_body_size 2g;

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

    location /api {
        proxy_pass http://backend:8000;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
        # Big uploads and long-running processing/status calls.
        proxy_request_buffering off;
        proxy_read_timeout 600s;
        proxy_send_timeout 600s;
    }

    # SPA routing: every non-file path renders index.html.
    location / {
        try_files $uri /index.html;
    }

    # Hashed assets can cache forever; index.html must not.
    location /assets/ {
        add_header Cache-Control "public, max-age=31536000, immutable";
    }
    location = /index.html {
        add_header Cache-Control "no-cache";
    }
}