/*!
 * Special:Preferences skin section enhancements.
 * When the skin tab is infused by OOUI, toggle skin preferences based on skin state.
 */

( function () {
	function invalidateSkinPrefsDisplay( $root ) {
		var
			// The skin preferences section. Skins with preferences should use the
			// section `rendering/skin/skin-prefs` toa dd skin specific preferences
			// in their onGetPreferences() hook.
			// At time of writing, this functionality is only used by Vector and Monobook.
			$skinPrefs = $root.find( '#mw-prefsection-rendering-skin-skin-prefs' ),
			// oo-ui-fieldLayout is the wrapper class name for each preference. When all wrappers are
			// disabled by hide-if (oo-ui-fieldLayout-disabled), the whole section should be hidden.
			show = !!$skinPrefs.find( '.oo-ui-fieldLayout' ).not( '.oo-ui-fieldLayout-disabled' ).length;

		$skinPrefs.parent().css( 'display', show ? '' : 'none' );
	}

	function onHTMLFormEnhance( $root ) {
		var $skins = $root.find( '#mw-input-wpskin' );
		if ( !$skins.length ) {
			return;
		}

		// No need to listen for subsequent events.
		mw.hook( 'htmlform.enhance' ).remove( onHTMLFormEnhance );

		// Set the initial skin preference display state based on the skin selected.
		invalidateSkinPrefsDisplay( $root );

		// Observe skin radio state selection changes.
		OO.ui.infuse( $skins ).on( 'change', function () {
			invalidateSkinPrefsDisplay( $root );
		} );
	}

	// Wait for the tab to be infused by OOUI before manipulating it further. htmlform.enhance is
	// emitted on page load by resources/src/mediawiki.htmlform/htmlform.js, again for each tab
	// infused by resources/src/mediawiki.special.preferences.ooui/tabs.js, and possibly other
	// scenarios.
	mw.hook( 'htmlform.enhance' ).add( onHTMLFormEnhance );
}() );
