package preview

import (
	"golang.org/x/text/language"
	"golang.org/x/text/language/display"
)

// languageNames derives native names from CLDR for the generated preview locales.
func languageNames(locales []string) map[string]string {
	names := make(map[string]string, len(locales))
	for _, locale := range locales {
		name := locale
		if tag, err := language.Parse(locale); err == nil {
			if native := display.Self.Name(tag); native != "" {
				name = native
			}
		}
		names[locale] = name
	}
	return names
}