const watchstar = require( 'mediawiki.page.watch.ajax' ).watchstar;
const WATCHED_ICON_CLASS = 'minerva-icon--unStar';
const TEMP_WATCHED_ICON_CLASS = 'minerva-icon--halfStar';
const UNWATCHED_ICON_CLASS = 'minerva-icon--star';

/**
 * Tweaks the global watchstar handler in core to use the correct classes for Minerva.
 *
 * @param {jQuery} $icon
 * @ignore
 */
function init( $icon ) {
	const $watchlink = $icon.find( 'a' );
	watchstar( $watchlink, mw.config.get( 'wgRelevantPageName' ), toggleClasses );
}

/**
 * @param {jQuery} $link
 * @param {boolean} isWatched
 * @param {string} expiry
 * @private
 */
function toggleClasses( $link, isWatched, expiry ) {
	const $icon = $link.find( '.minerva-icon' );
	$icon.removeClass( [ WATCHED_ICON_CLASS, UNWATCHED_ICON_CLASS, TEMP_WATCHED_ICON_CLASS ] )
		.addClass( () => {
			let classes = UNWATCHED_ICON_CLASS;
			if ( isWatched ) {
				if ( expiry !== null && expiry !== undefined && expiry !== 'infinity' ) {
					classes = TEMP_WATCHED_ICON_CLASS;
				} else {
					classes = WATCHED_ICON_CLASS;
				}
			}
			return classes;
		} );
}

module.exports = {
	init: init,
	test: {
		toggleClasses,
		TEMP_WATCHED_ICON_CLASS,
		WATCHED_ICON_CLASS,
		UNWATCHED_ICON_CLASS
	}
};