package emapi

import (
	"net/url"
	"strings"
)

// idOrLinkID returns the id if not empty, otherwise it plucks the last subpath from the link.
// An empty string is returned if nothing is defined or an error occurs.
func idOrLinkID(id, link string) string {
	if id != "" || link == "" {
		return id
	}

	url, err := url.Parse(link)
	if err != nil {
		return ""
	}

	parts := strings.Split(strings.TrimRight(url.Path, "/"), "/")

	if len(parts) != 0 {
		return parts[len(parts)-1]
	}

	return ""
}