/**
 * @file js/classes/linkAction/ModalRequest.js
 *
 * Copyright (c) 2014-2019 Simon Fraser University
 * Copyright (c) 2000-2019 John Willinsky
 * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
 *
 * @class ModalRequest
 * @ingroup js_classes_linkAction
 *
 * @brief Modal link action request.
 */
(function($) {


	/**
	 * @constructor
	 *
	 * @extends $.pkp.classes.linkAction.LinkActionRequest
	 *
	 * @param {jQueryObject} $linkActionElement The element the link
	 *  action was attached to.
	 * @param {{
	 *  modalHandler: Object
	 *  }} options Configuration of the link action
	 *  request.
	 */
	$.pkp.classes.linkAction.ModalRequest =
			function($linkActionElement, options) {

		this.parent($linkActionElement, options);
	};
	$.pkp.classes.Helper.inherits(
			$.pkp.classes.linkAction.ModalRequest,
			$.pkp.classes.linkAction.LinkActionRequest);


	//
	// Private properties
	//
	/**
	 * A pointer to the modal HTML element.
	 * @private
	 * @type {jQueryObject}
	 */
	$.pkp.classes.linkAction.ModalRequest.prototype.$modal_ = null;


	//
	// Public methods
	//
	/**
	 * @inheritDoc
	 */
	$.pkp.classes.linkAction.ModalRequest.prototype.activate =
			function(element, event) {

		// If there is no title then try to retrieve a title
		// from the calling element's text.
		var modalOptions = this.getOptions(),
				$handledElement = this.getLinkActionElement(),
				title = $handledElement.text(),
				uuid,
				$linkActionElement,
				linkActionHandler,
				handlerOptions,
				modalHandler;

		if (modalOptions.title === undefined) {
			if (title === '') {
				// Try to retrieve a title from the link action element's
				// title attribute.
				title = $handledElement.attr('title');
			}
			modalOptions.title = title;
		}

		// Generate a unique ID.
		uuid = $.pkp.classes.Helper.uuid();

		// Instantiate the modal.
		if (!modalOptions.modalHandler) {
			throw new Error(['The "modalHandler" setting is required ',
				'in a ModalRequest'].join(''));
		}

		// Make sure that all events triggered on the modal will be
		// forwarded to the link action. This is necessary because the
		// modal has to be created outside the regular DOM.
		$linkActionElement = /** @type {jQueryObject} */ (
				this.getLinkActionElement());
		linkActionHandler = $.pkp.classes.Handler.getHandler($linkActionElement);
		handlerOptions = $.extend(true,
				{eventBridge: linkActionHandler.getStaticId()}, modalOptions);
		this.$modal_ = $(
				'<div id="' + uuid + '" ' +
				'class="pkp_modal pkpModalWrapper" tabindex="-1"></div>')
				.pkpHandler(modalOptions.modalHandler, handlerOptions);

		// Subscribe to the modal handler's 'removed' event so that
		// we can clean up.
		modalHandler = $.pkp.classes.Handler.getHandler(this.$modal_);
		modalHandler.bind('pkpRemoveHandler',
				$.pkp.classes.Helper.curry(this.finish, this));

		return /** @type {boolean} */ (this.parent('activate', element, event));
	};


	/**
	 * @inheritDoc
	 */
	$.pkp.classes.linkAction.ModalRequest.prototype.finish =
			function() {

		// A workaround for a bug in IE9-11 (and maybe others), whereby restoring
		// the focus to the New Review Round tab causes the modal to be opened
		// again. This hack effects accessibility and should be removed if/when we
		// move away from jQueryUI tabs.
		// See: https://github.com/pkp/pkp-lib/issues/2703
		if (this.$linkActionElement.attr('id')
				.indexOf('newRoundTabContainer') !== 0) {
			// Put the focus back on the linkAction which launched the modal
			this.$linkActionElement.focus();
		}

		this.$modal_.remove();
		return /** @type {boolean} */ (this.parent('finish'));
	};


/** @param {jQuery} $ jQuery closure. */
}(jQuery));
