# Nginx Reverse Proxy para Course Plat
# Uso: Copiar para docker/production/nginx.conf ou /etc/nginx/sites-available/course-plat

events {
    worker_connections 1024;
}

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

    # Logging
    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;

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

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml text/javascript
               application/json application/javascript application/xml+rss
               application/rss+xml font/truetype font/opentype
               application/vnd.ms-fontobject image/svg+xml;

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=login:10m rate=5r/m;

    # Upstream da aplicação
    upstream app_backend {
        server app:3000;
        keepalive 32;
    }

    # HTTP -> HTTPS redirect (descomentar em prod com SSL)
    # server {
    #     listen 80;
    #     server_name seu-dominio.com.br;
    #     return 301 https://$server_name$request_uri;
    # }

    # Server principal
    server {
        listen 80;
        # listen 443 ssl http2;  # Descomentar para SSL
        server_name _;

        # SSL Configuration (descomentar para production)
        # ssl_certificate /etc/nginx/ssl/cert.pem;
        # ssl_certificate_key /etc/nginx/ssl/key.pem;
        # ssl_protocols TLSv1.2 TLSv1.3;
        # ssl_ciphers HIGH:!aNULL:!MD5;

        # 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 "no-referrer-when-downgrade" always;

        # Client body size limit (uploads)
        client_max_body_size 500M;

        # Proxy settings
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        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_cache_bypass $http_upgrade;

        # Next.js static files (com cache)
        location /_next/static {
            alias /var/www/.next/static;
            expires 365d;
            add_header Cache-Control "public, immutable";
        }

        location /static {
            alias /var/www/public;
            expires 30d;
            add_header Cache-Control "public";
        }

        # API routes (sem cache, com rate limit)
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://app_backend;
        }

        # Auth endpoints (rate limit mais estrito)
        location /api/auth/ {
            limit_req zone=login burst=5 nodelay;
            proxy_pass http://app_backend;
        }

        # File downloads (proxy)
        location /api/files/ {
            proxy_pass http://app_backend;
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
        }

        # Todas as outras requests
        location / {
            proxy_pass http://app_backend;
            proxy_read_timeout 300s;
            proxy_connect_timeout 75s;
        }

        # Health check
        location /health {
            access_log off;
            proxy_pass http://app_backend/api/health;
        }
    }
}