/**

* @author Richard Davey <rich@photonstorm.com>

* @copyright 2019 Photon Storm Ltd.

* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}

*/

var Class = require('../../utils/Class');

var CONST = require('../const');

var File = require('../File');

var FileTypesManager = require('../FileTypesManager');

var GetFastValue = require('../../utils/object/GetFastValue');

var IsPlainObject = require('../../utils/object/IsPlainObject');

/**

* @typedef {object} Phaser.Loader.FileTypes.CSSFileConfig

*

* @property {string} key - The key of the file. Must be unique within the Loader.

* @property {string} [url] - The absolute or relative URL to load the file from.

* @property {string} [extension='js'] - The default file extension to use if no url is provided.

* @property {Phaser.Loader.Types.XHRSettingsObject} [xhrSettings] - Extra XHR Settings specifically for this file.

*/

/**

* @classdesc

* A single CSS File suitable for loading by the Loader.

*

* These are created when you use the Phaser.Loader.LoaderPlugin#css method and are not typically created directly.

*

* For documentation about what all the arguments and configuration options mean please see Phaser.Loader.LoaderPlugin#css.

*

* @class CSSFile

* @extends Phaser.Loader.File

* @memberof Phaser.Loader.FileTypes

* @constructor

* @since 3.17.0

*

* @param {Phaser.Loader.LoaderPlugin} loader - A reference to the Loader that is responsible for this file.

* @param {(string|Phaser.Loader.FileTypes.CSSFileConfig)} key - The key to use for this file, or a file configuration object.

* @param {string} [url] - The absolute or relative URL to load this file from. If undefined or `null` it will be set to `<key>.js`, i.e. if `key` was "alien" then the URL will be "alien.js".

* @param {Phaser.Loader.Types.XHRSettingsObject} [xhrSettings] - Extra XHR Settings specifically for this file.

*/

var CSSFile = new Class({

Extends: File,

initialize:

function CSSFile (loader, key, url, xhrSettings)

{

var extension = 'css';

if (IsPlainObject(key))

{

var config = key;

key = GetFastValue(config, 'key');

url = GetFastValue(config, 'url');

xhrSettings = GetFastValue(config, 'xhrSettings');

extension = GetFastValue(config, 'extension', extension);

}

var fileConfig = {

type: 'script',

cache: false,

extension: extension,

responseType: 'text',

key: key,

url: url,

xhrSettings: xhrSettings

};

File.call(this, loader, fileConfig);

},

/**

* Called automatically by Loader.nextFile.

* This method controls what extra work this File does with its loaded data.

*

* @method Phaser.Loader.FileTypes.CSSFile#onProcess

* @since 3.17.0

*/

onProcess: function ()

{

this.state = CONST.FILE_PROCESSING;

this.data = document.createElement('style');

this.data.defer = false;

this.data.innerHTML = this.xhrLoader.responseText;

document.head.appendChild(this.data);

this.onProcessComplete();

}

});

/**

* Adds a CSS file, or array of CSS files, to the current load queue.

*

* You can call this method from within your Scene's `preload`, along with any other files you wish to load:

*

* ```javascript

* function preload ()

* {

* this.load.css('headers', 'styles/headers.css');

* }

* ```

*

* The file is **not** loaded right away. It is added to a queue ready to be loaded either when the loader starts,

* or if it's already running, when the next free load slot becomes available. This happens automatically if you

* are calling this from within the Scene's `preload` method, or a related callback. Because the file is queued

* it means you cannot use the file immediately after calling this method, but must wait for the file to complete.

* The typical flow for a Phaser Scene is that you load assets in the Scene's `preload` method and then when the

* Scene's `create` method is called you are guaranteed that all of those assets are ready for use and have been

* loaded.

*

* The key must be a unique String and not already in-use by another file in the Loader.

*

* Instead of passing arguments you can pass a configuration object, such as:

*

* ```javascript

* this.load.css({

* key: 'headers',

* url: 'styles/headers.css'

* });

* ```

*

* See the documentation for `Phaser.Loader.FileTypes.CSSFileConfig` for more details.

*

* Once the file has finished loading it will automatically be converted into a style DOM element

* via `document.createElement('style')`. It will have its `defer` property set to false and then the

* resulting element will be appended to `document.head`. The CSS styles are then applied to the current document.

*

* The URL can be relative or absolute. If the URL is relative the `Loader.baseURL` and `Loader.path` values will be prepended to it.

*

* If the URL isn't specified the Loader will take the key and create a filename from that. For example if the key is "alien"

* and no URL is given then the Loader will set the URL to be "alien.css". It will always add `.css` as the extension, although

* this can be overridden if using an object instead of method arguments. If you do not desire this action then provide a URL.

*

* Note: The ability to load this type of file will only be available if the CSS File type has been built into Phaser.

* It is available in the default build but can be excluded from custom builds.

*

* @method Phaser.Loader.LoaderPlugin#css

* @fires Phaser.Loader.LoaderPlugin#addFileEvent

* @since 3.17.0

*

* @param {(string|Phaser.Loader.FileTypes.CSSFileConfig|Phaser.Loader.FileTypes.CSSFileConfig[])} key - The key to use for this file, or a file configuration object, or array of them.

* @param {string} [url] - The absolute or relative URL to load this file from. If undefined or `null` it will be set to `<key>.css`, i.e. if `key` was "alien" then the URL will be "alien.css".

* @param {Phaser.Loader.Types.XHRSettingsObject} [xhrSettings] - An XHR Settings configuration object. Used in replacement of the Loaders default XHR Settings.

*

* @return {Phaser.Loader.LoaderPlugin} The Loader instance.

*/

FileTypesManager.register('css', function (key, url, xhrSettings)

{

if (Array.isArray(key))

{

for (var i = 0; i < key.length; i++)

{

// If it's an array it has to be an array of Objects, so we get everything out of the 'key' object

this.addFile(new CSSFile(this, key[i]));

}

}

else

{

this.addFile(new CSSFile(this, key, url, xhrSettings));

}

return this;

});

module.exports = CSSFile;