/**
 * Copyright (c) 2013 Christopher Schäpers <christopher@schaepers.it>
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 * See the COPYING-README file.
 */

/**
 * This plugin inserts the right avatar for the user, depending on, whether a
 * custom avatar is uploaded - which it uses then - or not, and display a
 * placeholder with the first letter of the users name instead.
 * For this it queries the core_avatar_get route, thus this plugin is fit very
 * tightly for owncloud, and it may not work anywhere else.
 *
 * You may use this on any <div></div>
 * Here I'm using <div class="avatardiv"></div> as an example.
 *
 * There are 5 ways to call this:
 *
 * 1. $('.avatardiv').avatar('jdoe', 128);
 * This will make the div to jdoe's fitting avatar, with a size of 128px.
 *
 * 2. $('.avatardiv').avatar('jdoe');
 * This will make the div to jdoe's fitting avatar. If the div already has a
 * height, it will be used for the avatars size. Otherwise this plugin will
 * search for 'size' DOM data, to use for avatar size. If neither are available
 * it will default to 64px.
 *
 * 3. $('.avatardiv').avatar();
 * This will search the DOM for 'user' data, to use as the username. If there
 * is no username available it will default to a placeholder with the value of
 * "?". The size will be determined the same way, as the second example.
 *
 * 4. $('.avatardiv').avatar('jdoe', 128, true);
 * This will behave like the first example, except it will also append random
 * hashes to the custom avatar images, to force image reloading in IE8.
 *
 * 5. $('.avatardiv').avatar('jdoe', 128, undefined, true);
 * This will behave like the first example, but it will hide the avatardiv, if
 * it will display the default placeholder. undefined is the ie8fix from
 * example 4 and can be either true, or false/undefined, to be ignored.
 *
 * 6. $('.avatardiv').avatar('jdoe', 128, undefined, true, callback);
 * This will behave like the above example, but it will call the function
 * defined in callback after the avatar is placed into the DOM.
 *
 */

(function ($) {
	$.fn.avatar = function(user, size, ie8fix, hidedefault, callback, displayname) {
		var setAvatarForUnknownUser = function(target) {
			target.imageplaceholder('?');
			target.css('background-color', '#b9b9b9');
		};

		if (typeof(user) !== 'undefined') {
			user = String(user);
		}
		if (typeof(displayname) !== 'undefined') {
			displayname = String(displayname);
		}

		if (typeof(size) === 'undefined') {
			if (this.height() > 0) {
				size = this.height();
			} else if (this.data('size') > 0) {
				size = this.data('size');
			} else {
				size = 64;
			}
		}

		this.height(size);
		this.width(size);

		if (typeof(user) === 'undefined') {
			if (typeof(this.data('user')) !== 'undefined') {
				user = this.data('user');
			} else {
				setAvatarForUnknownUser(this);
				return;
			}
		}

		// sanitize
		user = String(user).replace(/\//g,'');

		var $div = this;
		var url;

		// If this is our own avatar we have to use the version attribute
		if (user === OC.getCurrentUser().uid) {
			url = OC.generateUrl(
				'/avatar/{user}/{size}?v={version}',
				{
					user: user,
					size: Math.ceil(size * window.devicePixelRatio),
					version: oc_userconfig.avatar.version
				});
		} else {
			url = OC.generateUrl(
				'/avatar/{user}/{size}',
				{
					user: user,
					size: Math.ceil(size * window.devicePixelRatio)
				});
		}

		var img = new Image();

		// If the new image loads successfully set it.
		img.onload = function() {
			$div.clearimageplaceholder();
			$div.append(img);

			if(typeof callback === 'function') {
				callback();
			}
		};
		// Fallback when avatar loading fails:
		// Use old placeholder when a displayname attribute is defined,
		// otherwise show the unknown user placeholder.
		img.onerror = function () {
			$div.clearimageplaceholder();
			if (typeof(displayname) !== 'undefined') {
				$div.imageplaceholder(user, displayname);
			} else {
				setAvatarForUnknownUser($div);
			}

			if(typeof callback === 'function') {
				callback();
			}
		};

		if (size < 32) {
			$div.addClass('icon-loading-small');
		} else {
			$div.addClass('icon-loading');
		}
		img.width = size;
		img.height = size;
		img.src = url;
		img.alt = '';
	};
}(jQuery));
