# Same-origin reverse proxy: serves the SPA and forwards /api/v1 to the API.
# TLS termination happens at the platform edge in production; locally this
# server is exposed on plain HTTP at 127.0.0.1:8080.
server {
    listen 80;
    server_name _;

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

    # Import uploads are capped at 20 MB by product rules; leave headroom.
    client_max_body_size 25m;

    # Baseline security headers. TLS/HSTS/CSP are configured at the platform
    # edge (see docs/operations/beta-release-runbook.md).
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "DENY" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

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

    # Block dotfiles (except ACME challenges if ever needed).
    location ~ /\. {
        deny all;
    }

    # Reverse proxy to the FastAPI API. No URI part on proxy_pass, so the
    # /api/v1 prefix is preserved end to end.
    location /api/v1/ {
        proxy_pass http://api:8000;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Request-Id $request_id;
        proxy_connect_timeout 5s;
        proxy_read_timeout 60s;
    }

    # Hashed static assets are immutable.
    location /assets/ {
        access_log off;
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # SPA fallback for client-side routes.
    location / {
        try_files $uri $uri/ /index.html;
    }
}