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/**
 * Collapsible navigation for Vector
 */
( function ( mw, $ ) {
	'use strict';
	var map;

	// Use the same function for all navigation headings - don't repeat
	function toggle( $element ) {
		$.cookie(
			'vector-nav-' + $element.parent().attr( 'id' ),
			$element.parent().is( '.collapsed' ),
			{ 'expires': 30, 'path': '/' }
		);
		$element
			.parent()
			.toggleClass( 'expanded' )
			.toggleClass( 'collapsed' )
			.find( '.body' )
			.slideToggle( 'fast' );
	}

	/* Browser Support */

	map = {
		// Left-to-right languages
		ltr: {
			// Collapsible Nav is broken in Opera < 9.6 and Konqueror < 4
			opera: [['>=', 9.6]],
			konqueror: [['>=', 4.0]],
			blackberry: false,
			ipod: false,
			iphone: false,
			ps3: false
		},
		// Right-to-left languages
		rtl: {
			opera: [['>=', 9.6]],
			konqueror: [['>=', 4.0]],
			blackberry: false,
			ipod: false,
			iphone: false,
			ps3: false
		}
	};
	if ( !$.client.test( map ) ) {
		return true;
	}

	$( function ( $ ) {
		var $headings, tabIndex;

		/* General Portal Modification */

		// Always show the first portal
		$( '#mw-panel > .portal:first' ).addClass( 'first persistent' );
		// Apply a class to the entire panel to activate styles
		$( '#mw-panel' ).addClass( 'collapsible-nav' );
		// Use cookie data to restore preferences of what to show and hide
		$( '#mw-panel > .portal:not(.persistent)' )
			.each( function ( i ) {
				var id = $(this).attr( 'id' ),
					state = $.cookie( 'vector-nav-' + id );
				// Add anchor tag to heading for better accessibility
				$( this ).find( 'h3' ).wrapInner( $( '<a href="#"></a>' ).click( false ) );
				// In the case that we are not showing the new version, let's show the languages by default
				if (
					state === 'true' ||
					( state === null && i < 1 ) ||
					( state === null && id === 'p-lang' )
				) {
					$(this)
						.addClass( 'expanded' )
						.removeClass( 'collapsed' )
						.find( '.body' )
						.hide() // bug 34450
						.show();
				} else {
					$(this)
						.addClass( 'collapsed' )
						.removeClass( 'expanded' );
				}
				// Re-save cookie
				if ( state !== null ) {
					$.cookie( 'vector-nav-' + $(this).attr( 'id' ), state, { 'expires': 30, 'path': '/' } );
				}
			} );

		/* Tab Indexing */

		$headings = $( '#mw-panel > .portal:not(.persistent) > h3' );

		// Get the highest tab index
		tabIndex = $( document ).lastTabIndex() + 1;

		// Fix the search not having a tabindex
		$( '#searchInput' ).attr( 'tabindex', tabIndex++ );

		// Make it keyboard accessible
		$headings.attr( 'tabindex', function () {
			return tabIndex++;
		});

		// Toggle the selected menu's class and expand or collapse the menu
		$( '#mw-panel' )
			.delegate( '.portal:not(.persistent) > h3', 'keydown', function ( e ) {
				// Make the space and enter keys act as a click
				if ( e.which === 13 /* Enter */ || e.which === 32 /* Space */ ) {
					toggle( $(this) );
				}
			} )
			.delegate( '.portal:not(.persistent) > h3', 'mousedown', function ( e ) {
				if ( e.which !== 3 ) { // Right mouse click
					toggle( $(this) );
					$(this).blur();
				}
				return false;
			} );
	});

}( mediaWiki, jQuery ) );