package utils

import (
	"fmt"
	"net"
	"regexp"
)

func ValidateIP(ip string) error {
	if net.ParseIP(ip) == nil {
		return fmt.Errorf("invalid IP address: %s", ip)
	}
	return nil
}

func ValidateDomain(domain string) error {
	if domain == "" {
		return fmt.Errorf("domain cannot be empty")
	}

	domainRegex := regexp.MustCompile(`^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$`)
	if !domainRegex.MatchString(domain) {
		return fmt.Errorf("invalid domain format: %s", domain)
	}

	return nil
}

func ValidatePort(port int) error {
	if port < 1 || port > 65535 {
		return fmt.Errorf("invalid port number: %d (must be between 1 and 65535)", port)
	}
	return nil
}