<?php

/**
 * @file plugins/generic/googleAnalytics/GoogleAnalyticsPlugin.inc.php
 *
 * Copyright (c) 2014-2020 Simon Fraser University
 * Copyright (c) 2003-2020 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class GoogleAnalyticsPlugin
 * @ingroup plugins_generic_googleAnalytics
 *
 * @brief Google Analytics plugin class
 */

import('lib.pkp.classes.plugins.GenericPlugin');

class GoogleAnalyticsPlugin extends GenericPlugin {
	/**
	 * @copydoc Plugin::register()
	 */
	function register($category, $path, $mainContextId = null) {
		$success = parent::register($category, $path, $mainContextId);
		if (!Config::getVar('general', 'installed') || defined('RUNNING_UPGRADE')) return true;
		if ($success && $this->getEnabled($mainContextId)) {
			// Insert Google Analytics page tag to footer
			HookRegistry::register('TemplateManager::display', array($this, 'registerScript'));
		}
		return $success;
	}

	/**
	 * @copydoc Plugin::getDisplayName()
	 */
	function getDisplayName() {
		return __('plugins.generic.googleAnalytics.displayName');
	}

	/**
	 * @copydoc Plugin::getDescription()
	 */
	function getDescription() {
		return __('plugins.generic.googleAnalytics.description');
	}

	/**
	 * @copydoc Plugin::getActions()
	 */
	function getActions($request, $verb) {
		$router = $request->getRouter();
		import('lib.pkp.classes.linkAction.request.AjaxModal');
		return array_merge(
			$this->getEnabled()?array(
				new LinkAction(
					'settings',
					new AjaxModal(
						$router->url($request, null, null, 'manage', null, array('verb' => 'settings', 'plugin' => $this->getName(), 'category' => 'generic')),
						$this->getDisplayName()
					),
					__('manager.plugins.settings'),
					null
				),
			):array(),
			parent::getActions($request, $verb)
		);
	}

 	/**
	 * @copydoc Plugin::manage()
	 */
	function manage($args, $request) {
		switch ($request->getUserVar('verb')) {
			case 'settings':
				$context = $request->getContext();

				AppLocale::requireComponents(LOCALE_COMPONENT_APP_COMMON,  LOCALE_COMPONENT_PKP_MANAGER);
				$templateMgr = TemplateManager::getManager($request);
				$templateMgr->registerPlugin('function', 'plugin_url', array($this, 'smartyPluginUrl'));

				$this->import('GoogleAnalyticsSettingsForm');
				$form = new GoogleAnalyticsSettingsForm($this, $context->getId());

				if ($request->getUserVar('save')) {
					$form->readInputData();
					if ($form->validate()) {
						$form->execute();
						return new JSONMessage(true);
					}
				} else {
					$form->initData();
				}
				return new JSONMessage(true, $form->fetch($request));
		}
		return parent::manage($args, $request);
	}

	/**
	 * Register the Google Analytics script tag
	 * @param $hookName string
	 * @param $params array
	 */
	function registerScript($hookName, $params) {
		$request = Application::get()->getRequest();
		$context = $request->getContext();
		if (!$context) return false;
		$router = $request->getRouter();
		if (!is_a($router, 'PKPPageRouter')) return false;

		$googleAnalyticsSiteId = $this->getSetting($context->getId(), 'googleAnalyticsSiteId');
		if (empty($googleAnalyticsSiteId)) return false;

		$googleAnalyticsCode = "
(function (w, d, s, l, i) { w[l] = w[l] || []; var f = d.getElementsByTagName(s)[0],
j = d.createElement(s), dl = l != 'dataLayer' ? '&l=' + l : ''; j.async = true; 
j.src = 'https://www.googletagmanager.com/gtag/js?id=' + i + dl; f.parentNode.insertBefore(j, f); 
function gtag(){dataLayer.push(arguments)}; gtag('js', new Date()); gtag('config', i); })
(window, document, 'script', 'dataLayer', '$googleAnalyticsSiteId');
";

		$templateMgr = TemplateManager::getManager($request);
		$templateMgr->addJavaScript(
			'googleanalytics',
			$googleAnalyticsCode,
			array(
				'priority' => STYLE_SEQUENCE_LAST,
				'inline'   => true,
			)
		);

		return false;
	}
}