/* global setUserSetting, ajaxurl, commonL10n, alert, confirm, pagenow */

( function( $, window, undefined ) {

	var $document = $( document ),

		$window = $( window ),

		$body = $( document.body );

	init : function() {},

	fold : function() {},

	restoreMenuState : function() {},

	toggle : function() {},

	favorites : function() {}

};

	init : function() {

		var that = this;

		$('.hide-column-tog', '#adv-settings').click( function() {

			var $t = $(this), column = $t.val();

			if ( $t.prop('checked') )

				that.checked(column);

			else

				that.unchecked(column);

			columns.saveManageColumnsState();

		});

	},

	saveManageColumnsState : function() {

		var hidden = this.hidden();

		$.post(ajaxurl, {

			action: 'hidden-columns',

			hidden: hidden,

			screenoptionnonce: $('#screenoptionnonce').val(),

			page: pagenow

		});

	},

	checked : function(column) {

		$('.column-' + column).removeClass( 'hidden' );

		this.colSpanChange(+1);

	},

	unchecked : function(column) {

		$('.column-' + column).addClass( 'hidden' );

		this.colSpanChange(-1);

	},

	hidden : function() {

			return this.id;

		}).get().join( ',' );

	},

	useCheckboxesForHidden : function() {

		this.hidden = function(){

			return $('.hide-column-tog').not(':checked').map(function() {

				var id = this.id;

				return id.substring( id, id.length - 5 );

			}).get().join(',');

		};

	},

	colSpanChange : function(diff) {

		var $t = $('table').find('.colspanchange'), n;

		if ( !$t.length )

			return;

		n = parseInt( $t.attr('colspan'), 10 ) + diff;

		$t.attr('colspan', n.toString());

	}

};

$document.ready(function(){columns.init();});

	return !$( form )

		.find( '.form-required' )

		.filter( function() { return $( ':input:visible', this ).val() === ''; } )

		.addClass( 'form-invalid' )

		.find( ':input:visible' )

		.change( function() { $( this ).closest( '.form-invalid' ).removeClass( 'form-invalid' ); } )

		.length;

};

// stub for doing better warnings

	warn : function() {

		var msg = commonL10n.warnDelete || '';

		if ( confirm(msg) ) {

			return true;

		}

		return false;

	},

	note : function(text) {

		alert(text);

	}

};

	element: null, // #screen-meta

	toggles: null, // .screen-meta-toggle

	page:    null, // #wpcontent

	init: function() {

		this.element = $('#screen-meta');

		this.toggles = $( '#screen-meta-links' ).find( '.show-settings' );

		this.page    = $('#wpcontent');

		this.toggles.click( this.toggleEvent );

	},

	toggleEvent: function() {

		var panel = $( '#' + $( this ).attr( 'aria-controls' ) );

		if ( !panel.length )

			return;

		if ( panel.is(':visible') )

			screenMeta.close( panel, $(this) );

		else

			screenMeta.open( panel, $(this) );

	},

	open: function( panel, button ) {

		$( '#screen-meta-links' ).find( '.screen-meta-toggle' ).not( button.parent() ).css( 'visibility', 'hidden' );

		panel.parent().show();

		panel.slideDown( 'fast', function() {

			panel.focus();

			button.addClass( 'screen-meta-active' ).attr( 'aria-expanded', true );

		});

		$document.trigger( 'screen:options:open' );

	},

	close: function( panel, button ) {

		panel.slideUp( 'fast', function() {

			button.removeClass( 'screen-meta-active' ).attr( 'aria-expanded', false );

			$('.screen-meta-toggle').css('visibility', '');

			panel.parent().hide();

		});

		$document.trigger( 'screen:options:close' );

	}

};

/**

 */

$('.contextual-help-tabs').delegate('a', 'click', function(e) {

	var link = $(this),

		panel;

	e.preventDefault();

	// Don't do anything if the click is for the tab already showing.

	if ( link.is('.active a') )

		return false;

	// Links

	$('.contextual-help-tabs .active').removeClass('active');

	link.parent('li').addClass('active');

	panel = $( link.attr('href') );

	// Panels

	$('.help-tab-content').not( panel ).removeClass('active').hide();

	panel.addClass('active').show();

});

/**

 * Update custom permalink structure via buttons.

 */

var permalinkStructureFocused = false,

    $permalinkStructure       = $( '#permalink_structure' ),

    $permalinkStructureInputs = $( '.permalink-structure input:radio' ),

    $permalinkCustomSelection = $( '#custom_selection' ),

    $availableStructureTags   = $( '.form-table.permalink-structure .available-structure-tags button' );

// Change permalink structure input when selecting one of the common structures.

$permalinkStructureInputs.on( 'change', function() {

	if ( 'custom' === this.value ) {

		return;

	}

	$permalinkStructure.val( this.value );

	// Update button states after selection.

	$availableStructureTags.each( function() {

		changeStructureTagButtonState( $( this ) );

	} );

} );

$permalinkStructure.on( 'click input', function() {

	$permalinkCustomSelection.prop( 'checked', true );

} );

// Check if the permalink structure input field has had focus at least once.

$permalinkStructure.on( 'focus', function( event ) {

	permalinkStructureFocused = true;

	$( this ).off( event );

} );

/**

 * Enables or disables a structure tag button depending on its usage.

 *

 * If the structure is already used in the custom permalink structure,

 * it will be disabled.

 *

 * @param {object} button Button jQuery object.

 */

function changeStructureTagButtonState( button ) {

	if ( -1 !== $permalinkStructure.val().indexOf( button.text().trim() ) ) {

		button.attr( 'data-label', button.attr( 'aria-label' ) );

		button.attr( 'aria-label', button.attr( 'data-used' ) );