/**
* @output wp-includes/js/customize-loader.js
*/

/* global _wpCustomizeLoaderSettings */

/**
* Expose a public API that allows the customizer to be
* loaded on any page.
*
* @namespace wp
*/
window.wp = window.wp || {};

(function( exports, $ ){
var api = wp.customize,
Loader;

$.extend( $.support, {
history: !! ( window.history && history.pushState ),
hashchange: ('onhashchange' in window) && (document.documentMode === undefined || document.documentMode > 7)
});

/**
* Allows the Customizer to be overlaid on any page.
*
* By default, any element in the body with the load-customize class will open
* an iframe overlay with the URL specified.
*
* e.g. <a class="load-customize" href="<?php echo wp_customize_url(); ?>">Open Customizer</a>
*
* @memberOf wp.customize
*
* @class
* @augments wp.customize.Events
*/
Loader = $.extend( {}, api.Events,/** @lends wp.customize.Loader.prototype */{
/**
* Setup the Loader; triggered on document#ready.
*/
initialize: function() {
this.body = $( document.body );

// Ensure the loader is supported.
// Check for settings, postMessage support, and whether we require CORS support.
if ( ! Loader.settings || ! $.support.postMessage || ( ! $.support.cors && Loader.settings.isCrossDomain ) ) {
return;
}

this.window = $( window );
this.element = $( '<div id="customize-container" />' ).appendTo( this.body );

// Bind events for opening and closing the overlay.
this.bind( 'open', this.overlay.show );
this.bind( 'close', this.overlay.hide );

// Any element in the body with the `load-customize` class opens
// the Customizer.
$('#wpbody').on( 'click', '.load-customize', function( event ) {
event.preventDefault();

// Store a reference to the link that opened the Customizer.
Loader.link = $(this);
// Load the theme.
Loader.open( Loader.link.attr('href') );
});

// Add navigation listeners.
if ( $.support.history ) {
this.window.on( 'popstate', Loader.popstate );
}

if ( $.support.hashchange ) {
this.window.on( 'hashchange', Loader.hashchange );
this.window.triggerHandler( 'hashchange' );
}
},

popstate: function( e ) {
var state = e.originalEvent.state;
if ( state && state.customize ) {
Loader.open( state.customize );
} else if ( Loader.active ) {
Loader.close();
}
},

hashchange: function() {
var hash = window.location.toString().split('#')[1];

if ( hash && 0 === hash.indexOf( 'wp_customize=on' ) ) {
Loader.open( Loader.settings.url + '?' + hash );
}

if ( ! hash && ! $.support.history ) {
Loader.close();
}
},

beforeunload: function () {
if ( ! Loader.saved() ) {
return Loader.settings.l10n.saveAlert;
}
},

/**
* Open the Customizer overlay for a specific URL.
*
* @param string src URL to load in the Customizer.
*/
open: function( src ) {

if ( this.active ) {
return;
}

// Load the full page on mobile devices.
if ( Loader.settings.browser.mobile ) {
return window.location = src;
}

// Store the document title prior to opening the Live Preview.
this.originalDocumentTitle = document.title;

this.active = true;
this.body.addClass('customize-loading');

/*
* Track the dirtiness state (whether the drafted changes have been published)
* of the Customizer in the iframe. This is used to decide whether to display
* an AYS alert if the user tries to close the window before saving changes.
*/
this.saved = new api.Value( true );

this.iframe = $( '<iframe />', { 'src': src, 'title': Loader.settings.l10n.mainIframeTitle } ).appendTo( this.element );
this.iframe.one( 'load', this.loaded );

// Create a postMessage connection with the iframe.
this.messenger = new api.Messenger({
url: src,
channel: 'loader',
targetWindow: this.iframe[0].contentWindow
});

// Expose the changeset UUID on the parent window's URL so that the customized state can survive a refresh.
if ( history.replaceState ) {
this.messenger.bind( 'changeset-uuid', function( changesetUuid ) {
var urlParser = document.createElement( 'a' );
urlParser.href = location.href;
urlParser.search = $.param( _.extend(
api.utils.parseQueryString( urlParser.search.substr( 1 ) ),
{ changeset_uuid: changesetUuid }
) );
history.replaceState( { customize: urlParser.href }, '', urlParser.href );
} );
}

// Wait for the connection from the iframe before sending any postMessage events.
this.messenger.bind( 'ready', function() {
Loader.messenger.send( 'back' );
});

this.messenger.bind( 'close', function() {
if ( $.support.history ) {
history.back();
} else if ( $.support.hashchange ) {
window.location.hash = '';
} else {
Loader.close();
}
});

// Prompt AYS dialog when navigating away.
$( window ).on( 'beforeunload', this.beforeunload );

this.messenger.bind( 'saved', function () {
Loader.saved( true );
} );
this.messenger.bind( 'change', function () {
Loader.saved( false );
} );

this.messenger.bind( 'title', function( newTitle ){
window.document.title = newTitle;
});

this.pushState( src );

this.trigger( 'open' );
},

pushState: function ( src ) {
var hash = src.split( '?' )[1];

// Ensure we don't call pushState if the user hit the forward button.
if ( $.support.history && window.location.href !== src ) {
history.pushState( { customize: src }, '', src );
} else if ( ! $.support.history && $.support.hashchange && hash ) {
window.location.hash = 'wp_customize=on&' + hash;
}

this.trigger( 'open' );
},

/**
* Callback after the Customizer has been opened.
*/
opened: function() {
Loader.body.addClass( 'customize-active full-overlay-active' ).attr( 'aria-busy', 'true' );
},

/**
* Close the Customizer overlay.
*/
close: function() {
var self = this, onConfirmClose;
if ( ! self.active ) {
return;
}

onConfirmClose = function( confirmed ) {
if ( confirmed ) {
self.active = false;
self.trigger( 'close' );

// Restore document title prior to opening the Live Preview.
if ( self.originalDocumentTitle ) {
document.title = self.originalDocumentTitle;
}
} else {

// Go forward since Customizer is exited by history.back().
history.forward();
}
self.messenger.unbind( 'confirmed-close', onConfirmClose );
};
self.messenger.bind( 'confirmed-close', onConfirmClose );

Loader.messenger.send( 'confirm-close' );
},

/**
* Callback after the Customizer has been closed.
*/
closed: function() {
Loader.iframe.remove();
Loader.messenger.destroy();
Loader.iframe = null;
Loader.messenger = null;
Loader.saved = null;
Loader.body.removeClass( 'customize-active full-overlay-active' ).removeClass( 'customize-loading' );
$( window ).off( 'beforeunload', Loader.beforeunload );
/*
* Return focus to the link that opened the Customizer overlay after
* the body element visibility is restored.
*/
if ( Loader.link ) {
Loader.link.focus();
}
},

/**
* Callback for the `load` event on the Customizer iframe.
*/
loaded: function() {
Loader.body.removeClass( 'customize-loading' ).attr( 'aria-busy', 'false' );
},

/**
* Overlay hide/show utility methods.
*/
overlay: {
show: function() {
this.element.fadeIn( 200, Loader.opened );
},

hide: function() {
this.element.fadeOut( 200, Loader.closed );
}
}
});

// Bootstrap the Loader on document#ready.
$( function() {
Loader.settings = _wpCustomizeLoaderSettings;
Loader.initialize();
});

// Expose the API publicly on window.wp.customize.Loader.
api.Loader = Loader;
})( wp, jQuery );