<?php

/**
 * ---------------------------------------------------------------------
 *
 * GLPI - Gestionnaire Libre de Parc Informatique
 *
 * http://glpi-project.org
 *
 * @copyright 2015-2023 Teclib' and contributors.
 * @copyright 2003-2014 by the INDEPNET Development Team.
 * @licence   https://www.gnu.org/licenses/gpl-3.0.html
 *
 * ---------------------------------------------------------------------
 *
 * LICENSE
 *
 * This file is part of GLPI.
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * ---------------------------------------------------------------------
 */

class Telemetry extends CommonGLPI
{
    public static function getTypeName($nb = 0)
    {
        return __('Telemetry');
    }

    /**
     * Grab telemetry information
     *
     * @return array
     */
    public static function getTelemetryInfos()
    {
        $data = [
            'glpi'   => self::grabGlpiInfos(),
            'system' => [
                'db'           => self::grabDbInfos(),
                'web_server'   => self::grabWebserverInfos(),
                'php'          => self::grabPhpInfos(),
                'os'           => self::grabOsInfos()
            ]
        ];

        return $data;
    }

    /**
     * Grab GLPI part information
     *
     * @return array
     */
    public static function grabGlpiInfos()
    {
        global $CFG_GLPI;

        $glpi = [
            'uuid'               => self::getInstanceUuid(),
            'version'            => GLPI_VERSION,
            'plugins'            => [],
            'default_language'   => $CFG_GLPI['language'],
            'install_mode'       => GLPI_INSTALL_MODE,
            'usage'              => [
                'avg_entities'          => self::getAverage('Entity'),
                'avg_computers'         => self::getAverage('Computer'),
                'avg_networkequipments' => self::getAverage('NetworkEquipment'),
                'avg_tickets'           => self::getAverage('Ticket'),
                'avg_problems'          => self::getAverage('Problem'),
                'avg_changes'           => self::getAverage('Change'),
                'avg_projects'          => self::getAverage('Project'),
                'avg_users'             => self::getAverage('User'),
                'avg_groups'            => self::getAverage('Group'),
                'ldap_enabled'          => AuthLDAP::useAuthLdap(),
                'mailcollector_enabled' => (MailCollector::countActiveCollectors() > 0),
                'notifications_modes'   => []
            ]
        ];

        $plugins = new Plugin();
        foreach ($plugins->getList(['directory', 'version']) as $plugin) {
            $glpi['plugins'][] = [
                'key'       => $plugin['directory'],
                'version'   => $plugin['version']
            ];
        }

        if ($CFG_GLPI['use_notifications']) {
            foreach (array_keys(\Notification_NotificationTemplate::getModes()) as $mode) {
                if ($CFG_GLPI['notifications_' . $mode]) {
                    $glpi['usage']['notifications'][] = $mode;
                }
            }
        }

        return $glpi;
    }

    /**
     * Grab DB part information
     *
     * @return array
     */
    public static function grabDbInfos()
    {
        global $DB;

        $dbinfos = $DB->getInfo();

        $size_res = $DB->request([
            'SELECT' => new \QueryExpression("ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) AS dbsize"),
            'FROM'   => 'information_schema.tables',
            'WHERE'  => ['table_schema' => $DB->dbdefault]
        ])->current();

        $db = [
            'engine'    => $dbinfos['Server Software'],
            'version'   => $dbinfos['Server Version'],
            'size'      => $size_res['dbsize'],
            'log_size'  => '',
            'sql_mode'  => $dbinfos['Server SQL Mode']
        ];

        return $db;
    }

    /**
     * Grab web server part information.
     * As we cannot rely on `$_SERVER` information on CLI context, we have to get to do a request to the GLPI webserver
     * and get the information from its response, if it is available.
     *
     * @return array
     */
    public static function grabWebserverInfos()
    {
        global $CFG_GLPI;

        $server = [
            'engine'  => '',
            'version' => '',
        ];

        if (!filter_var(gethostbyname(parse_url($CFG_GLPI['url_base'], PHP_URL_HOST)), FILTER_VALIDATE_IP)) {
            // Do not try to get headers if hostname cannot be resolved
            return $server;
        }

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $CFG_GLPI['url_base']);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 1);

        // Issue #3180 - disable SSL certificate validation (wildcard, self-signed)
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

        if ($response = curl_exec($ch)) {
            $headers = substr($response, 0, curl_getinfo($ch, CURLINFO_HEADER_SIZE));
            $header_matches = [];
            // see RFC2616
            //
            // `Server` header may contains multiple values (e.g. Apache/2.4.46 (Debian) mod_fcgid/2.3.9 OpenSSL/1.1.1d).
            // We only get the first value, assuming it corresponds to the server engine.
            $separators = '\/() ';
            $server_string_pattern = "(?<engine>[^{$separators}]+)" // mandatory `product`
                . "(\/(?<version>[^$separators]+))?" // optional `/version`
                . "( (?<comment>\([^$separators]+\)))?" // optional ` (comment)`
            ;
            if (preg_match("/^Server: {$server_string_pattern}/im", $headers, $header_matches) === 1) {
                $server['engine']  = $header_matches['engine'];
                $server['version'] = $header_matches['version'] ?? null;
            }
        }

        return $server;
    }

    /**
     * Grab PHP part information
     *
     * @return array
     */
    public static function grabPhpInfos()
    {
        $php = [
            'version'   => str_replace(PHP_EXTRA_VERSION, '', PHP_VERSION),
            'modules'   => get_loaded_extensions(),
            'setup'     => [
                'max_execution_time'    => ini_get('max_execution_time'),
                'memory_limit'          => ini_get('memory_limit'),
                'post_max_size'         => ini_get('post_max_size'),
                'safe_mode'             => ini_get('safe_mode'),
                'session'               => ini_get('session.save_handler'),
                'upload_max_filesize'   => ini_get('upload_max_filesize')
            ]
        ];

        return $php;
    }

    /**
     * Grab OS part information
     *
     * @return array
     */
    public static function grabOsInfos()
    {
        $distro = false;
        if (file_exists('/etc/redhat-release')) {
            $distro = preg_replace('/\s+$/S', '', file_get_contents('/etc/redhat-release'));
        }
        $os = [
            'family'       => php_uname('s'),
            'distribution' => ($distro ?: ''),
            'version'      => php_uname('r')
        ];
        return $os;
    }


    /**
     * Calculate average for itemtype
     *
     * @param string $itemtype Item type
     *
     * @return string
     */
    public static function getAverage($itemtype)
    {
        $count = (int)countElementsInTable(getTableForItemType($itemtype));

        if ($count <= 500) {
            return '0-500';
        } else if ($count <= 1000) {
            return '500-1000';
        } else if ($count <= 2500) {
            return '1000-2500';
        } else if ($count <= 5000) {
            return '2500-5000';
        } else if ($count <= 10000) {
            return '5000-10000';
        } else if ($count <= 50000) {
            return '10000-50000';
        } else if ($count <= 100000) {
            return '50000-100000';
        } else if ($count <= 500000) {
            return '100000-500000';
        }
        return '500000+';
    }

    public static function cronInfo($name)
    {
        switch ($name) {
            case 'telemetry':
                return ['description' => __('Send telemetry information')];
        }
        return [];
    }

    /**
     * Send telemetry information
     *
     * @param CronTask $task CronTask instance
     *
     * @return void
     */
    public static function cronTelemetry($task)
    {
        $data = self::getTelemetryInfos();
        $infos = json_encode(['data' => $data]);

        $url = GLPI_TELEMETRY_URI . '/telemetry';
        $opts = [
            CURLOPT_POSTFIELDS      => $infos,
            CURLOPT_HTTPHEADER      => ['Content-Type:application/json']
        ];

        $errstr = null;
        $content = json_decode(Toolbox::callCurl($url, $opts, $errstr));

        if ($content && property_exists($content, 'message')) {
           //all is OK!
            return 1;
        } else {
            $message = 'Something went wrong sending telemetry information';
            if ($errstr != '') {
                $message .= ": $errstr";
            }
            trigger_error($message, E_USER_WARNING);
            return null; // null = Action aborted
        }
    }

    /**
     * Get instance UUID
     *
     * @return string
     */
    final public static function getInstanceUuid()
    {
        return Config::getUuid('instance');
    }

    /**
     * Get registration UUID
     *
     * @return string
     */
    final public static function getRegistrationUuid()
    {
        return Config::getUuid('registration');
    }

    /**
     * Generates an unique identifier for current instance and store it
     *
     * @return string
     */
    final public static function generateInstanceUuid()
    {
        return Config::generateUuid('instance');
    }

    /**
     * Generates an unique identifier for current instance and store it
     *
     * @return string
     */
    final public static function generateRegistrationUuid()
    {
        return Config::generateUuid('registration');
    }


    /**
     * Get view data link along with popup script
     *
     * @return string
     */
    public static function getViewLink()
    {
        global $CFG_GLPI;

        $out = "<a id='view_telemetry' href='{$CFG_GLPI['root_doc']}/ajax/telemetry.php' class='btn btn-sm btn-info mt-2'>
         " . __('See what would be sent...') . "
      </a>";
        $out .= Html::scriptBlock("
         $('#view_telemetry').on('click', function(e) {
            e.preventDefault();

            glpi_ajax_dialog({
               title: __('Telemetry data'),
               url: $('#view_telemetry').attr('href'),
               dialogclass: 'modal-lg'
            });
         });");
        return $out;
    }

    /**
     * Enable telemetry
     *
     * @return void
     */
    public static function enable()
    {
        global $DB;
        $DB->update(
            'glpi_crontasks',
            ['state' => 1],
            ['name' => 'telemetry']
        );
    }

    /**
     * Disable telemetry
     *
     * @return void
     */
    public static function disable(): void
    {
        global $DB;
        $DB->update(
            'glpi_crontasks',
            ['state' => 0],
            ['name' => 'telemetry']
        );
    }

    /**
     * Is telemetry currently enabled
     *
     * @return boolean
     */
    public static function isEnabled()
    {
        global $DB;
        $iterator = $DB->request([
            'SELECT' => ['state'],
            'FROM'   => 'glpi_crontasks',
            'WHERE'  => [
                'name'   => 'telemetry',
                'state' => 1
            ]

        ]);
        return count($iterator) > 0;
    }


    /**
     * Display telemetry information
     *
     * @return string
     */
    public static function showTelemetry()
    {
        $out = "<div class='form-check'>
         <input type='checkbox' class='form-check-input' checked='checked' value='1' name='send_stats' id='send_stats'/>
         <label for='send_stats' class='form-check-label'>
            " . __('Send "usage statistics"') . "
         </label>
      </div>";
        $out .= "<strong>" . __("We need your help to improve GLPI and the plugins ecosystem!") . "</strong><br><br>";
        $out .= __("Since GLPI 9.2, we’ve introduced a new statistics feature called “Telemetry”, that anonymously with your permission, sends data to our telemetry website.") . "<br>";
        $out .= __("Once sent, usage statistics are aggregated and made available to a broad range of GLPI developers.") . "<br><br>";
        $out .= __("Let us know your usage to improve future versions of GLPI and its plugins!") . "<br>";

        $out .= self::getViewLink();
        return $out;
    }

    /**
     * Display reference information
     *
     * @return string
     */
    public static function showReference()
    {
        $out = "<h3>" . __('Reference your GLPI') . "</h3>";
        $out .= sprintf(
            __("Besides, if you appreciate GLPI and its community, " .
            "please take a minute to reference your organization by filling %1\$s"),
            sprintf(
                "<a href='" . GLPI_TELEMETRY_URI . "/reference?showmodal&uuid=" .
                self::getRegistrationUuid() . "' class='btn btn-sm btn-info' target='_blank'>
               <i class='fas fa-pen-alt me-1'></i>
               %1\$s
            </a>",
                __('the registration form')
            )
        );
        return $out;
    }
}