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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Insights generator.
 *
 * @package   core_analytics
 * @copyright 2019 David Monllao {@link http://www.davidmonllao.com}
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core_analytics;

defined('MOODLE_INTERNAL') || die();

require_once($CFG->dirroot . '/lib/messagelib.php');

/**
     * @var int
     */
    private $modelid;

/**
     * @var \core_analytics\local\target\base
     */
    private $target;

/**
     * @var int[]
     */
    private $contextcourseids;

/**
     * Constructor.
     *
     * @param int $modelid
     * @param \core_analytics\local\target\base $target
     */
    public function __construct(int $modelid, \core_analytics\local\target\base $target) {
        $this->modelid = $modelid;
        $this->target = $target;
    }

/**
     * Generates insight notifications.
     *
     * @param array                         $samplecontexts    The contexts these predictions belong to
     * @param \core_analytics\prediction[]  $predictions       The prediction records
     * @return  null
     */
    public function generate($samplecontexts, $predictions) {

$analyserclass = $this->target->get_analyser_class();

// We will need to restore it later.
        $actuallanguage = current_language();

if ($analyserclass::one_sample_per_analysable()) {

// Iterate through the predictions and the users in each prediction (likely to be just one).
            foreach ($predictions as $prediction) {

$context = $samplecontexts[$prediction->get_prediction_data()->contextid];

$users = $this->target->get_insights_users($context);
                foreach ($users as $user) {

$this->set_notification_language($user);
                    list($insighturl, $fullmessage, $fullmessagehtml) = $this->prediction_info($prediction, $context, $user);
                    $this->notification($context, $user, $insighturl, $fullmessage, $fullmessagehtml);
                }
            }

} else {

// Iterate through the context and the users in each context.
            foreach ($samplecontexts as $context) {

// Weird to pass both the context and the contextname to a method right, but this way we don't add unnecessary
                // db reads calling get_context_name() multiple times.
                $contextname = $context->get_context_name(false);

$users = $this->target->get_insights_users($context);
                foreach ($users as $user) {

$this->set_notification_language($user);

$insighturl = $this->target->get_insight_context_url($this->modelid, $context);

list($fullmessage, $fullmessagehtml) = $this->target->get_insight_body($context, $contextname, $user,
                        $insighturl);

$this->notification($context, $user, $insighturl, $fullmessage, $fullmessagehtml);
                }
            }
        }

force_current_language($actuallanguage);
    }

/**
     * Generates a insight notification for the user.
     *
     * @param  \context    $context
     * @param  \stdClass   $user
     * @param  \moodle_url $insighturl    The insight URL
     * @param  string      $fullmessage
     * @param  string      $fullmessagehtml
     * @return null
     */
    private function notification(\context $context, \stdClass $user, \moodle_url $insighturl, string $fullmessage, string $fullmessagehtml) {

$message = new \core\message\message();
        $message->component = 'moodle';
        $message->name = 'insights';

$message->userfrom = \core_user::get_support_user();
        $message->userto = $user;

$message->subject = $this->target->get_insight_subject($this->modelid, $context);

// Same than the subject.
        $message->contexturlname = $message->subject;
        $message->courseid = $this->get_context_courseid($context);

$message->fullmessage = $fullmessage;
        $message->fullmessageformat = FORMAT_PLAIN;
        $message->fullmessagehtml = $fullmessagehtml;
        $message->smallmessage = $fullmessage;
        $message->contexturl = $insighturl->out(false);

message_send($message);
    }

/**
     * Returns the course context of the provided context reading an internal cache first.
     *
     * @param  \context $context
     * @return int
     */
    private function get_context_courseid(\context $context) {

if (empty($this->contextcourseids[$context->id])) {

$coursecontext = $context->get_course_context(false);
            if (!$coursecontext) {
                // Default to the frontpage course context.
                $coursecontext = \context_course::instance(SITEID);
            }
            $this->contextcourseids[$context->id] = $coursecontext->instanceid;
        }

return $this->contextcourseids[$context->id];
    }

/**
     * Extracts info from the prediction for display purposes.
     *
     * @param  \core_analytics\prediction   $prediction
     * @param  \context                     $context
     * @param  \stdClass                    $user
     * @return array Three items array with formats [\moodle_url, string, string]
     */
    private function prediction_info(\core_analytics\prediction $prediction, \context $context, \stdClass $user) {
        global $OUTPUT;

// The prediction actions get passed to the target so that it can show them in its preferred way.
        $actions = array_merge(
            $this->target->prediction_actions($prediction, true, true),
            $this->target->bulk_actions([$prediction])
        );
        $predictioninfo = $this->target->get_insight_body_for_prediction($context, $user, $prediction, $actions);

// For FORMAT_PLAIN.
        $fullmessageplaintext = '';
        if (!empty($predictioninfo[FORMAT_PLAIN])) {
            $fullmessageplaintext .= $predictioninfo[FORMAT_PLAIN];
        }

$insighturl = $predictioninfo['url'] ?? null;

// For FORMAT_HTML.
        $messageactions  = [];
        foreach ($actions as $action) {
            if (!$action->get_url()->get_param('forwardurl')) {

$params = ['actionvisiblename' => $action->get_text(), 'target' => '_blank'];
                $actiondoneurl = new \moodle_url('/report/insights/done.php', $params);
                // Set the forward url to the 'done' script.
                $action->get_url()->param('forwardurl', $actiondoneurl->out(false));
            }

if ($action->get_url()->param('predictionid') === null) {
                // Bulk actions do not include the prediction id by default.
                $action->get_url()->param('predictionid', $prediction->get_prediction_data()->id);
            }

if (empty($insighturl)) {
                // Ideally the target provides us with the best URL for the insight, if it doesn't we default
                // to the first actions.
                $insighturl = $action->get_url();
            }

$actiondata = (object)['url' => $action->get_url()->out(false), 'text' => $action->get_text()];

// Basic message for people who still lives in the 90s.
            $fullmessageplaintext .= get_string('insightinfomessageaction', 'analytics', $actiondata) . PHP_EOL;

// We now process the HTML version actions, with a special treatment for useful/notuseful.
            if ($action->get_action_name() === 'useful') {
                $usefulurl = $actiondata->url;
            } else if ($action->get_action_name() === 'notuseful') {
                $notusefulurl = $actiondata->url;
            } else {
                $messageactions[] = $actiondata;
            }
        }

// Extra condition because we don't want to show the yes/no unless we have urls for both of them.
        if (!empty($usefulurl) && !empty($notusefulurl)) {
            $usefulbuttons = ['usefulurl' => $usefulurl, 'notusefulurl' => $notusefulurl];
        }

$contextinfo = [
            'usefulbuttons' => !empty($usefulbuttons) ? $usefulbuttons : false,
            'actions' => $messageactions,
            'body' => $predictioninfo[FORMAT_HTML] ?? ''
        ];
        $fullmessagehtml = $OUTPUT->render_from_template('core_analytics/insight_info_message_prediction', $contextinfo);

return [$insighturl, $fullmessageplaintext, $fullmessagehtml];
    }

/**
     * Sets the session language to the language used by the notification receiver.
     *
     * @param  \stdClass $user The user who will receive the message
     * @return null
     */
    private function set_notification_language($user) {
        global $CFG;

// Copied from current_language().
        if (!empty($user->lang)) {
            $lang = $user->lang;
        } else if (isset($CFG->lang)) {
            $lang = $CFG->lang;
        } else {
            $lang = 'en';
        }
        force_current_language($lang);
    }
}

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