events {
    worker_connections 1024;
}

http {
    upstream backend {
        server backend:5000;
    }

    upstream frontend {
        server frontend:3000;
    }

    # Rate limiting zone
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;

    server {
        listen 80;
        server_name _;

        # Redirect HTTP to HTTPS (uncomment when SSL is configured)
        # return 301 https://$host$request_uri;

        # API reverse proxy
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://backend;
            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;
            proxy_read_timeout 120s;
        }

        # Frontend
        location / {
            proxy_pass http://frontend;
            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;
        }

        # Cache static assets
        location /_next/static/ {
            proxy_pass http://frontend;
            proxy_cache_valid 200 365d;
            add_header Cache-Control "public, max-age=31536000, immutable";
        }
    }

    # HTTPS server (uncomment when SSL certificates are in ./ssl/)
    # server {
    #     listen 443 ssl;
    #     server_name your-domain.com;
    #
    #     ssl_certificate     /etc/nginx/ssl/cert.pem;
    #     ssl_certificate_key /etc/nginx/ssl/key.pem;
    #
    #     location /api/ {
    #         limit_req zone=api burst=20 nodelay;
    #         proxy_pass http://backend;
    #         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;
    #     }
    #
    #     location / {
    #         proxy_pass http://frontend;
    #         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;
    #     }
    # }
}