package seo

import "errors"

// Sentinel errors for SEO apply / lookups.
var (
	ErrNotFound    = errors.New("not found")
	ErrInvalidMode = errors.New("mode must be template or ai")
)

// ClientError reports whether err is a known client-facing SEO validation error.
func ClientError(err error) (msg string, ok bool) {
	switch {
	case err == nil:
		return "", false
	case errors.Is(err, ErrInvalidMode):
		return err.Error(), true
	default:
		return "", false
	}
}