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" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;
    error_log   /var/log/nginx/error.log warn;

    sendfile        on;
    tcp_nopush      on;
    tcp_nodelay     on;
    keepalive_timeout  65;
    types_hash_max_size 2048;

    # Upstream para Node.js app
    upstream tudo_aqui_app {
        server app:3000;
        keepalive 32;
    }

    # Rate limiting zones
    # API geral: 10 requisições por segundo por IP
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    # Autenticação: 5 requisições por minuto por IP (proteção contra brute-force)
    limit_req_zone $binary_remote_addr zone=auth:10m rate=5r/m;

    # Redirect HTTP para HTTPS
    server {
        listen       80;
        server_name  api.tudoaqui.ao tudoaqui.ao www.tudoaqui.ao;

        return 301 https://$server_name$request_uri;
    }

    # HTTPS com SSL/TLS
    server {
        listen       443 ssl http2;
        server_name  api.tudoaqui.ao;

        # Certificado SSL (auto-signed ou Let's Encrypt)
        ssl_certificate     /etc/nginx/ssl/certificado.crt;
        ssl_certificate_key /etc/nginx/ssl/chave.key;

        # Protocolos TLS (desabilita TLS 1.0 e 1.1 por segurança)
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
        ssl_prefer_server_ciphers on;
        ssl_session_cache   shared:SSL:10m;
        ssl_session_timeout 10m;

        # 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;
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
        add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'" always;

        # Gzip compression
        gzip on;
        gzip_vary on;
        gzip_proxied any;
        gzip_min_length 1024;
        gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;
        gzip_disable "msie6";

        # Rate limiting padrão
        limit_req zone=api burst=20 nodelay;

        # Autenticação - rate limiting apertado
        location ~ ^/api/v1/auth/(register|login|verificar-telefone) {
            limit_req zone=auth burst=5 nodelay;
            proxy_pass http://tudo_aqui_app;
            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_set_header X-Forwarded-Proto $scheme;
            proxy_set_header Connection "";
        }

        # API - rate limiting padrão
        location /api {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://tudo_aqui_app;
            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_set_header X-Forwarded-Proto $scheme;
            proxy_set_header Connection "";
        }

        # Arquivos estáticos - cache agressivo
        location /uploads {
            alias /app/uploads;
            expires 1y;
            add_header Cache-Control "public, immutable" always;
            access_log off;
        }

        # Health check (sem logs)
        location /health {
            proxy_pass http://tudo_aqui_app/health;
            access_log off;
        }

        # Deny access to hidden files
        location ~ /\. {
            deny all;
            access_log off;
            log_not_found off;
        }
    }
}