worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent"';
    access_log /var/log/nginx/access.log main;

    sendfile        on;
    keepalive_timeout 65;

    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml;
    gzip_min_length 1024;

    server {
        listen 80;
        server_name _;

        # Security headers
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-XSS-Protection "1; mode=block" always;
        add_header Referrer-Policy "strict-origin-when-cross-origin" always;

        # Proxy API requests to the backend
        location /api/ {
            proxy_pass         http://backend:8000;
            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_read_timeout 120s;
        }

        # Serve static frontend files
        location / {
            root  /usr/share/nginx/html;
            index index.html;
            try_files $uri $uri/ /index.html;
        }
    }
}