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

/** @namespace wp */
window.wp = window.wp || {};

(function( exports, $ ){
var api = {}, ctor, inherits,
slice = Array.prototype.slice;

// Shared empty constructor function to aid in prototype-chain creation.
ctor = function() {};

/**
* Helper function to correctly set up the prototype chain, for subclasses.
* Similar to `goog.inherits`, but uses a hash of prototype properties and
* class properties to be extended.
*
* @param object parent      Parent class constructor to inherit from.
* @param object protoProps  Properties to apply to the prototype for use as class instance properties.
* @param object staticProps Properties to apply directly to the class constructor.
* @return child The subclassed constructor.
*/
inherits = function( parent, protoProps, staticProps ) {
var child;

/*
* The constructor function for the new subclass is either defined by you
* (the "constructor" property in your `extend` definition), or defaulted
* by us to simply call `super()`.
*/
if ( protoProps && protoProps.hasOwnProperty( 'constructor' ) ) {
child = protoProps.constructor;
} else {
child = function() {
/*
* Storing the result `super()` before returning the value
* prevents a bug in Opera where, if the constructor returns
* a function, Opera will reject the return value in favor of
* the original object. This causes all sorts of trouble.
*/
var result = parent.apply( this, arguments );
return result;
};
}

// Inherit class (static) properties from parent.
$.extend( child, parent );

// Set the prototype chain to inherit from `parent`,
// without calling `parent`'s constructor function.
ctor.prototype  = parent.prototype;
child.prototype = new ctor();

// Add prototype properties (instance properties) to the subclass,
// if supplied.
if ( protoProps ) {
$.extend( child.prototype, protoProps );
}

// Add static properties to the constructor function, if supplied.
if ( staticProps ) {
$.extend( child, staticProps );
}

// Correctly set child's `prototype.constructor`.
child.prototype.constructor = child;

// Set a convenience property in case the parent's prototype is needed later.
child.__super__ = parent.prototype;

return child;
};

/**
* Base class for object inheritance.
*/
api.Class = function( applicator, argsArray, options ) {
var magic, args = arguments;

if ( applicator && argsArray && api.Class.applicator === applicator ) {
args = argsArray;
$.extend( this, options || {} );
}

magic = this;

/*
* If the class has a method called "instance",
* the return value from the class' constructor will be a function that
* calls the "instance" method.
*
* It is also an object that has properties and methods inside it.
*/
if ( this.instance ) {
magic = function() {
return magic.instance.apply( magic, arguments );
};

$.extend( magic, this );
}

magic.initialize.apply( magic, args );
return magic;
};

/**
* Creates a subclass of the class.
*
* @param object protoProps  Properties to apply to the prototype.
* @param object staticProps Properties to apply directly to the class.
* @return child The subclass.
*/
api.Class.extend = function( protoProps, staticProps ) {
var child = inherits( this, protoProps, staticProps );
child.extend = this.extend;
return child;
};

api.Class.applicator = {};

/**
* Initialize a class instance.
*
* Override this function in a subclass as needed.
*/
api.Class.prototype.initialize = function() {};

/*
* Checks whether a given instance extended a constructor.
*
* The magic surrounding the instance parameter causes the instanceof
* keyword to return inaccurate results; it defaults to the function's
* prototype instead of the constructor chain. Hence this function.
*/
api.Class.prototype.extended = function( constructor ) {
var proto = this;

while ( typeof proto.constructor !== 'undefined' ) {
if ( proto.constructor === constructor ) {
return true;
}
if ( typeof proto.constructor.__super__ === 'undefined' ) {
return false;
}
proto = proto.constructor.__super__;
}
return false;
};

/**
* An events manager object, offering the ability to bind to and trigger events.
*
* Used as a mixin.
*/
api.Events = {
trigger: function( id ) {
if ( this.topics && this.topics[ id ] ) {
this.topics[ id ].fireWith( this, slice.call( arguments, 1 ) );
}
return this;
},

bind: function( id ) {
this.topics = this.topics || {};
this.topics[ id ] = this.topics[ id ] || $.Callbacks();
this.topics[ id ].add.apply( this.topics[ id ], slice.call( arguments, 1 ) );
return this;
},

unbind: function( id ) {
if ( this.topics && this.topics[ id ] ) {
this.topics[ id ].remove.apply( this.topics[ id ], slice.call( arguments, 1 ) );
}
return this;
}
};

/**
* Observable values that support two-way binding.
*
* @memberOf wp.customize
* @alias wp.customize.Value
*
* @constructor
*/
api.Value = api.Class.extend(/** @lends wp.customize.Value.prototype */{
/**
* @param {mixed}  initial The initial value.
* @param {Object} options
*/
initialize: function( initial, options ) {
this._value = initial; // @todo Potentially change this to a this.set() call.
this.callbacks = $.Callbacks();
this._dirty = false;

$.extend( this, options || {} );

this.set = this.set.bind( this );
},

/*
* Magic. Returns a function that will become the instance.
* Set to null to prevent the instance from extending a function.
*/
instance: function() {
return arguments.length ? this.set.apply( this, arguments ) : this.get();
},

/**
* Get the value.
*
* @return {mixed}
*/
get: function() {
return this._value;
},

/**
* Set the value and trigger all bound callbacks.
*
* @param {Object} to New value.
*/
set: function( to ) {
var from = this._value;

to = this._setter.apply( this, arguments );
to = this.validate( to );

// Bail if the sanitized value is null or unchanged.
if ( null === to || _.isEqual( from, to ) ) {
return this;
}

this._value = to;
this._dirty = true;

this.callbacks.fireWith( this, [ to, from ] );

return this;
},

_setter: function( to ) {
return to;
},

setter: function( callback ) {
var from = this.get();
this._setter = callback;
// Temporarily clear value so setter can decide if it's valid.
this._value = null;
this.set( from );
return this;
},

resetSetter: function() {
this._setter = this.constructor.prototype._setter;
this.set( this.get() );
return this;
},

validate: function( value ) {
return value;
},

/**
* Bind a function to be invoked whenever the value changes.
*
* @param {...Function} A function, or multiple functions, to add to the callback stack.
*/
bind: function() {
this.callbacks.add.apply( this.callbacks, arguments );
return this;
},

/**
* Unbind a previously bound function.
*
* @param {...Function} A function, or multiple functions, to remove from the callback stack.
*/
unbind: function() {
this.callbacks.remove.apply( this.callbacks, arguments );
return this;
},

link: function() { // values*
var set = this.set;
$.each( arguments, function() {
this.bind( set );
});
return this;
},

unlink: function() { // values*
var set = this.set;
$.each( arguments, function() {
this.unbind( set );
});
return this;
},

sync: function() { // values*
var that = this;
$.each( arguments, function() {
that.link( this );
this.link( that );
});
return this;
},

unsync: function() { // values*
var that = this;
$.each( arguments, function() {
that.unlink( this );
this.unlink( that );
});
return this;
}
});

/**
* A collection of observable values.
*
* @memberOf wp.customize
* @alias wp.customize.Values
*
* @constructor
* @augments wp.customize.Class
* @mixes wp.customize.Events
*/
api.Values = api.Class.extend(/** @lends wp.customize.Values.prototype */{

/**
* The default constructor for items of the collection.
*
* @type {object}
*/
defaultConstructor: api.Value,

initialize: function( options ) {
$.extend( this, options || {} );

this._value = {};
this._deferreds = {};
},

/**
* Get the instance of an item from the collection if only ID is specified.
*
* If more than one argument is supplied, all are expected to be IDs and
* the last to be a function callback that will be invoked when the requested
* items are available.
*
* @see {api.Values.when}
*
* @param {string} id ID of the item.
* @param {...}       Zero or more IDs of items to wait for and a callback
*                    function to invoke when they're available. Optional.
* @return {mixed} The item instance if only one ID was supplied.
*                 A Deferred Promise object if a callback function is supplied.
*/
instance: function( id ) {
if ( arguments.length === 1 ) {
return this.value( id );
}

return this.when.apply( this, arguments );
},

/**
* Get the instance of an item.
*
* @param {string} id The ID of the item.
* @return {[type]} [description]
*/
value: function( id ) {
return this._value[ id ];
},

/**
* Whether the collection has an item with the given ID.
*
* @param {string} id The ID of the item to look for.
* @return {boolean}
*/
has: function( id ) {
return typeof this._value[ id ] !== 'undefined';
},

/**
* Add an item to the collection.
*
* @param {string|wp.customize.Class} item - The item instance to add, or the ID for the instance to add. When an ID string is supplied, then itemObject must be provided.
* @param {wp.customize.Class}        [itemObject] - The item instance when the first argument is a ID string.
* @return {wp.customize.Class} The new item's instance, or an existing instance if already added.
*/
add: function( item, itemObject ) {
var collection = this, id, instance;
if ( 'string' === typeof item ) {
id = item;
instance = itemObject;
} else {
if ( 'string' !== typeof item.id ) {
throw new Error( 'Unknown key' );
}
id = item.id;
instance = item;
}

if ( collection.has( id ) ) {
return collection.value( id );
}

collection._value[ id ] = instance;
instance.parent = collection;

// Propagate a 'change' event on an item up to the collection.
if ( instance.extended( api.Value ) ) {
instance.bind( collection._change );
}

collection.trigger( 'add', instance );

// If a deferred object exists for this item,
// resolve it.
if ( collection._deferreds[ id ] ) {
collection._deferreds[ id ].resolve();
}

return collection._value[ id ];
},

/**
* Create a new item of the collection using the collection's default constructor
* and store it in the collection.
*
* @param {string} id    The ID of the item.
* @param {mixed}  value Any extra arguments are passed into the item's initialize method.
* @return {mixed} The new item's instance.
*/
create: function( id ) {
return this.add( id, new this.defaultConstructor( api.Class.applicator, slice.call( arguments, 1 ) ) );
},

/**
* Iterate over all items in the collection invoking the provided callback.
*
* @param {Function} callback Function to invoke.
* @param {Object}   context  Object context to invoke the function with. Optional.
*/
each: function( callback, context ) {
context = typeof context === 'undefined' ? this : context;

$.each( this._value, function( key, obj ) {
callback.call( context, obj, key );
});
},

/**
* Remove an item from the collection.
*
* @param {string} id The ID of the item to remove.
*/
remove: function( id ) {
var value = this.value( id );

if ( value ) {

// Trigger event right before the element is removed from the collection.
this.trigger( 'remove', value );

if ( value.extended( api.Value ) ) {
value.unbind( this._change );
}
delete value.parent;
}

delete this._value[ id ];
delete this._deferreds[ id ];

// Trigger removed event after the item has been eliminated from the collection.
if ( value ) {
this.trigger( 'removed', value );
}
},

/**
* Runs a callback once all requested values exist.
*
* when( ids*, [callback] );
*
* For example:
*     when( id1, id2, id3, function( value1, value2, value3 ) {} );
*
* @return $.Deferred.promise();
*/
when: function() {
var self = this,
ids  = slice.call( arguments ),
dfd  = $.Deferred();

// If the last argument is a callback, bind it to .done().
if ( typeof ids[ ids.length - 1 ] === 'function' ) {
dfd.done( ids.pop() );
}

/*
* Create a stack of deferred objects for each item that is not
* yet available, and invoke the supplied callback when they are.
*/
$.when.apply( $, $.map( ids, function( id ) {
if ( self.has( id ) ) {
return;
}

/*
* The requested item is not available yet, create a deferred
* object to resolve when it becomes available.
*/
return self._deferreds[ id ] = self._deferreds[ id ] || $.Deferred();
})).done( function() {
var values = $.map( ids, function( id ) {
return self( id );
});

// If a value is missing, we've used at least one expired deferred.
// Call Values.when again to generate a new deferred.
if ( values.length !== ids.length ) {
// ids.push( callback );
self.when.apply( self, ids ).done( function() {
dfd.resolveWith( self, values );
});
return;
}

dfd.resolveWith( self, values );
});

return dfd.promise();
},

/**
* A helper function to propagate a 'change' event from an item
* to the collection itself.
*/
_change: function() {
this.parent.trigger( 'change', this );
}
});

// Create a global events bus on the Customizer.
$.extend( api.Values.prototype, api.Events );


/**
* Cast a string to a jQuery collection if it isn't already.
*
* @param {string|jQuery collection} element
*/
api.ensure = function( element ) {
return typeof element === 'string' ? $( element ) : element;
};

/**
* An observable value that syncs with an element.
*
* Handles inputs, selects, and textareas by default.
*
* @memberOf wp.customize
* @alias wp.customize.Element
*
* @constructor
* @augments wp.customize.Value
* @augments wp.customize.Class
*/
api.Element = api.Value.extend(/** @lends wp.customize.Element */{
initialize: function( element, options ) {
var self = this,
synchronizer = api.Element.synchronizer.html,
type, update, refresh;

this.element = api.ensure( element );
this.events = '';

if ( this.element.is( 'input, select, textarea' ) ) {
type = this.element.prop( 'type' );
this.events += ' change input';
synchronizer = api.Element.synchronizer.val;

if ( this.element.is( 'input' ) && api.Element.synchronizer[ type ] ) {
synchronizer = api.Element.synchronizer[ type ];
}
}

api.Value.prototype.initialize.call( this, null, $.extend( options || {}, synchronizer ) );
this._value = this.get();

update = this.update;
refresh = this.refresh;

this.update = function( to ) {
if ( to !== refresh.call( self ) ) {
update.apply( this, arguments );
}
};
this.refresh = function() {
self.set( refresh.call( self ) );
};

this.bind( this.update );
this.element.on( this.events, this.refresh );
},

find: function( selector ) {
return $( selector, this.element );
},

refresh: function() {},

update: function() {}
});

api.Element.synchronizer = {};

$.each( [ 'html', 'val' ], function( index, method ) {
api.Element.synchronizer[ method ] = {
update: function( to ) {
this.element[ method ]( to );
},
refresh: function() {
return this.element[ method ]();
}
};
});

api.Element.synchronizer.checkbox = {
update: function( to ) {
this.element.prop( 'checked', to );
},
refresh: function() {
return this.element.prop( 'checked' );
}
};

api.Element.synchronizer.radio = {
update: function( to ) {
this.element.filter( function() {
return this.value === to;
}).prop( 'checked', true );
},
refresh: function() {
return this.element.filter( ':checked' ).val();
}
};

$.support.postMessage = !! window.postMessage;

/**
* A communicator for sending data from one window to another over postMessage.
*
* @memberOf wp.customize
* @alias wp.customize.Messenger
*
* @constructor
* @augments wp.customize.Class
* @mixes wp.customize.Events
*/
api.Messenger = api.Class.extend(/** @lends wp.customize.Messenger.prototype */{
/**
* Create a new Value.
*
* @param {string} key     Unique identifier.
* @param {mixed}  initial Initial value.
* @param {mixed}  options Options hash. Optional.
* @return {Value} Class instance of the Value.
*/
add: function( key, initial, options ) {
return this[ key ] = new api.Value( initial, options );
},

/**
* Initialize Messenger.
*
* @param {Object} params  - Parameters to configure the messenger.
*        {string} params.url          - The URL to communicate with.
*        {window} params.targetWindow - The window instance to communicate with. Default window.parent.
*        {string} params.channel      - If provided, will send the channel with each message and only accept messages a matching channel.
* @param {Object} options - Extend any instance parameter or method with this object.
*/
initialize: function( params, options ) {
// Target the parent frame by default, but only if a parent frame exists.
var defaultTarget = window.parent === window ? null : window.parent;

$.extend( this, options || {} );

this.add( 'channel', params.channel );
this.add( 'url', params.url || '' );
this.add( 'origin', this.url() ).link( this.url ).setter( function( to ) {
var urlParser = document.createElement( 'a' );
urlParser.href = to;
// Port stripping needed by IE since it adds to host but not to event.origin.
return urlParser.protocol + '//' + urlParser.host.replace( /:(80|443)$/, '' );
});

// First add with no value.
this.add( 'targetWindow', null );
// This avoids SecurityErrors when setting a window object in x-origin iframe'd scenarios.
this.targetWindow.set = function( to ) {
var from = this._value;

to = this._setter.apply( this, arguments );
to = this.validate( to );

if ( null === to || from === to ) {
return this;
}

this._value = to;
this._dirty = true;

this.callbacks.fireWith( this, [ to, from ] );

return this;
};
// Now set it.
this.targetWindow( params.targetWindow || defaultTarget );


/*
* Since we want jQuery to treat the receive function as unique
* to this instance, we give the function a new guid.
*
* This will prevent every Messenger's receive function from being
* unbound when calling $.off( 'message', this.receive );
*/
this.receive = this.receive.bind( this );
this.receive.guid = $.guid++;

$( window ).on( 'message', this.receive );
},

destroy: function() {
$( window ).off( 'message', this.receive );
},

/**
* Receive data from the other window.
*
* @param {jQuery.Event} event Event with embedded data.
*/
receive: function( event ) {
var message;

event = event.originalEvent;

if ( ! this.targetWindow || ! this.targetWindow() ) {
return;
}

// Check to make sure the origin is valid.
if ( this.origin() && event.origin !== this.origin() ) {
return;
}

// Ensure we have a string that's JSON.parse-able.
if ( typeof event.data !== 'string' || event.data[0] !== '{' ) {
return;
}

message = JSON.parse( event.data );

// Check required message properties.
if ( ! message || ! message.id || typeof message.data === 'undefined' ) {
return;
}

// Check if channel names match.
if ( ( message.channel || this.channel() ) && this.channel() !== message.channel ) {
return;
}

this.trigger( message.id, message.data );
},

/**
* Send data to the other window.
*
* @param {string} id   The event name.
* @param {Object} data Data.
*/
send: function( id, data ) {
var message;

data = typeof data === 'undefined' ? null : data;

if ( ! this.url() || ! this.targetWindow() ) {
return;
}

message = { id: id, data: data };
if ( this.channel() ) {
message.channel = this.channel();
}

this.targetWindow().postMessage( JSON.stringify( message ), this.origin() );
}
});

// Add the Events mixin to api.Messenger.
$.extend( api.Messenger.prototype, api.Events );

/**
* Notification.
*
* @class
* @augments wp.customize.Class
* @since 4.6.0
*
* @memberOf wp.customize
* @alias wp.customize.Notification
*
* @param {string}  code - The error code.
* @param {object}  params - Params.
* @param {string}  params.message=null - The error message.
* @param {string}  [params.type=error] - The notification type.
* @param {boolean} [params.fromServer=false] - Whether the notification was server-sent.
* @param {string}  [params.setting=null] - The setting ID that the notification is related to.
* @param {*}       [params.data=null] - Any additional data.
*/
api.Notification = api.Class.extend(/** @lends wp.customize.Notification.prototype */{

/**
* Template function for rendering the notification.
*
* This will be populated with template option or else it will be populated with template from the ID.
*
* @since 4.9.0
* @var {Function}
*/
template: null,

/**
* ID for the template to render the notification.
*
* @since 4.9.0
* @var {string}
*/
templateId: 'customize-notification',

/**
* Additional class names to add to the notification container.
*
* @since 4.9.0
* @var {string}
*/
containerClasses: '',

/**
* Initialize notification.
*
* @since 4.9.0
*
* @param {string}   code - Notification code.
* @param {Object}   params - Notification parameters.
* @param {string}   params.message - Message.
* @param {string}   [params.type=error] - Type.
* @param {string}   [params.setting] - Related setting ID.
* @param {Function} [params.template] - Function for rendering template. If not provided, this will come from templateId.
* @param {string}   [params.templateId] - ID for template to render the notification.
* @param {string}   [params.containerClasses] - Additional class names to add to the notification container.
* @param {boolean}  [params.dismissible] - Whether the notification can be dismissed.
*/
initialize: function( code, params ) {
var _params;
this.code = code;
_params = _.extend(
{
message: null,
type: 'error',
fromServer: false,
data: null,
setting: null,
template: null,
dismissible: false,
containerClasses: ''
},
params
);
delete _params.code;
_.extend( this, _params );
},

/**
* Render the notification.
*
* @since 4.9.0
*
* @return {jQuery} Notification container element.
*/
render: function() {
var notification = this, container, data;
if ( ! notification.template ) {
notification.template = wp.template( notification.templateId );
}
data = _.extend( {}, notification, {
alt: notification.parent && notification.parent.alt
} );
container = $( notification.template( data ) );

if ( notification.dismissible ) {
container.find( '.notice-dismiss' ).on( 'click keydown', function( event ) {
if ( 'keydown' === event.type && 13 !== event.which ) {
return;
}

if ( notification.parent ) {
notification.parent.remove( notification.code );
} else {
container.remove();
}
});
}

return container;
}
});

// The main API object is also a collection of all customizer settings.
api = $.extend( new api.Values(), api );

/**
* Get all customize settings.
*
* @alias wp.customize.get
*
* @return {Object}
*/
api.get = function() {
var result = {};

this.each( function( obj, key ) {
result[ key ] = obj.get();
});

return result;
};

/**
* Utility function namespace
*
* @namespace wp.customize.utils
*/
api.utils = {};

/**
* Parse query string.
*
* @since 4.7.0
* @access public
*
* @alias wp.customize.utils.parseQueryString
*
* @param {string} queryString Query string.
* @return {Object} Parsed query string.
*/
api.utils.parseQueryString = function parseQueryString( queryString ) {
var queryParams = {};
_.each( queryString.split( '&' ), function( pair ) {
var parts, key, value;
parts = pair.split( '=', 2 );
if ( ! parts[0] ) {
return;
}
key = decodeURIComponent( parts[0].replace( /\+/g, ' ' ) );
key = key.replace( / /g, '_' ); // What PHP does.
if ( _.isUndefined( parts[1] ) ) {
value = null;
} else {
value = decodeURIComponent( parts[1].replace( /\+/g, ' ' ) );
}
queryParams[ key ] = value;
} );
return queryParams;
};

/**
* Expose the API publicly on window.wp.customize
*
* @namespace wp.customize
*/
exports.customize = api;
})( wp, jQuery );