<?php

/**
 * @file PiwikPlugin.inc.php
 *
 * Copyright (c) 2013-2021 Simon Fraser University
 * Copyright (c) 2003-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file LICENSE.
 *
 * @class PiwikPlugin
 * @ingroup plugins_generic_piwik
 *
 * @brief Piwik plugin class
 */

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

class PiwikPlugin 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 && $this->getEnabled()) {
			// Insert Piwik page tag to footer
			HookRegistry::register('TemplateManager::display', array($this, 'registerScript'));
			$this->_registerTemplateResource();
		}
		return $success;
	}

	/**
	 * Get the plugin display name.
	 * @return string
	 */
	function getDisplayName() {
		return __('plugins.generic.piwik.displayName');
	}

	/**
	 * Get the plugin description.
	 * @return string
	 */
	function getDescription() {
		return __('plugins.generic.piwik.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);

				$this->import('PiwikSettingsForm');
				$form = new PiwikSettingsForm($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 Piwik script tag
	 * @param $hookName string
	 * @param $params array
	 */
	function registerScript($hookName, $params) {
		$request = $this->getRequest();
		$context = $request->getContext();
		if (!$context) return false;
		$router = $request->getRouter();
		if (!is_a($router, 'PKPPageRouter')) return false;

		$piwikSiteId = $this->getSetting($context->getId(), 'piwikSiteId');
		$piwikUrl = $this->getSetting($context->getId(), 'piwikUrl');
		$piwikRelativeUrl = preg_replace('/^https?:/', '', rtrim($piwikUrl, '/')) . '/';
		if (empty($piwikSiteId) || empty($piwikUrl)) return false;

		$contextPath = $context->getPath();

		$piwikCode = <<< EOF
			var _paq = _paq || [];
			  _paq.push(['trackPageView']);
			  _paq.push(['enableLinkTracking']);
			  (function() {
			    var u="{$piwikRelativeUrl}";
			    _paq.push(['setTrackerUrl', u+'piwik.php']);
			    _paq.push(['setSiteId', {$piwikSiteId}]);
			    _paq.push(['setDocumentTitle', "{$contextPath}"]);
			    var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
			    g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
			  })();
EOF;

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

		return false;
	}

}