/**
 * This extracts the type (e.g. "web") from one or more <cite> elements class name lists, as
 * long as these don't conflict. A "citation" class is always ignored. <cite> elements without
 * another class (other than "citation") are ignored as well.
 *
 * Note this might return multiple types, e.g. <cite class="web citation paywalled"> will be
 * returned as "web paywalled". Validation must be done in the code consuming this.
 *
 * This duplicates the strict type detection from
 * @see https://phabricator.wikimedia.org/diffusion/GMOA/browse/master/lib/transformations/references/structureReferenceListContent.js$93
 *
 * @param {JQuery} $referenceText
 * @return {string|null}
 */
function scrapeReferenceType( $referenceText ) {
	let type = null;

	$referenceText.find( 'cite[class]' ).each( function ( index, el ) {
		const nextType = el.className.replace( /\bcitation\b\s*/g, '' ).trim();

		if ( !type ) {
			type = nextType;
		} else if ( nextType && nextType !== type ) {
			type = null;
			return false;
		}
	} );

	return type;
}

const getCitationType = (citations) => {
    if (citations.size === 1) {
        const value = citations.values().next().value;
        if (CITATION_TYPES.includes(value)) {
            return value;
        }
    }
    return DEFAULT_CITATION_TYPE;
};