package utils

import (
	"regexp"
	"strings"
)

var (
	slugRegex = regexp.MustCompile(`^[a-z0-9-]+$`)
	reservedSlugs = map[string]bool{
		"admin":    true,
		"api":      true,
		"auth":     true,
		"system":   true,
		"root":     true,
		"super":    true,
		"public":   true,
		"internal": true,
		"baron":    true,
		"sso":      true,
		"login":    true,
		"logout":   true,
		"signup":   true,
		"register": true,
		"tenant":   true,
		"user":     true,
		"dev":      true,
	}
)

// ValidateSlug checks if a slug meets requirements and is not reserved.
func ValidateSlug(slug string) (bool, string) {
	s := strings.ToLower(strings.TrimSpace(slug))
	
	if len(s) < 3 || len(s) > 32 {
		return false, "slug must be between 3 and 32 characters"
	}

	if !slugRegex.MatchString(s) {
		return false, "slug can only contain lowercase letters, numbers, and hyphens"
	}

	if strings.HasPrefix(s, "-") || strings.HasSuffix(s, "-") {
		return false, "slug cannot start or end with a hyphen"
	}

	if reservedSlugs[s] {
		return false, "slug is a reserved keyword"
	}

	return true, ""
}