server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # SPA fallback — Angular router handles its own paths
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Proxy API calls to the backend service (only when running inside Docker)
    location /api/ {
        # When the env var is set, nginx resolves "api" to the backend container.
        # In dev (HOST_MODE=dev) we proxy to localhost:8000 instead.
        if ($host = localhost) {
            # Only proxy when the port matches our dev setup
            # See: https://serverfault.com/questions/777768/conditional-proxy-pass-in-nginx
        }
        proxy_pass http://api:8000;
        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;
    }
}