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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/>.

/**
 * External functions
 *
 * @package    message_airnotifier
 * @category   external
 * @copyright  2012 Jerome Mouneyrac <jerome@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @since Moodle 2.7
 */

defined('MOODLE_INTERNAL') || die;

require_once("$CFG->libdir/externallib.php");

/**
 * External API for airnotifier web services
 *
 * @package    message_airnotifier
 * @category   external
 * @copyright  2012 Jerome Mouneyrac <jerome@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @since Moodle 2.7
 */
class message_airnotifier_external extends external_api {

/**
     * Returns description of method parameters
     *
     * @since Moodle 2.7
     */
    public static function is_system_configured_parameters() {
        return new external_function_parameters(
                array()
        );
    }

/**
     * Tests whether the airnotifier settings have been configured
     *
     * @since Moodle 2.7
     */
    public static function is_system_configured() {
        global $DB;

// First, check if the plugin is disabled.
        $processor = $DB->get_record('message_processors', array('name' => 'airnotifier'), '*', MUST_EXIST);
        if (!$processor->enabled) {
            return 0;
        }

// Then, check if the plugin is completly configured.
        $manager = new message_airnotifier_manager();
        return (int) $manager->is_system_configured();
    }

/**
     * Returns description of method result value
     *
     * @return external_single_structure
     * @since Moodle 2.7
     */
    public static function is_system_configured_returns() {
        return new external_value( PARAM_INT, '0 if the system is not configured, 1 otherwise');
    }

/**
     * Returns description of method parameters
     *
     * @since Moodle 2.7
     */
    public static function are_notification_preferences_configured_parameters() {
        return new external_function_parameters(
                array(
                    'userids' => new external_multiple_structure(new external_value(PARAM_INT, 'user ID')),
                )
        );
    }

/**
     * Check if the users have notification preferences configured for the airnotifier plugin
     *
     * @param array $userids Array of user ids
     * @since Moodle 2.7
     */
    public static function are_notification_preferences_configured($userids) {
        global $CFG, $USER, $DB;

require_once($CFG->dirroot . '/message/lib.php');
        $params = self::validate_parameters(self::are_notification_preferences_configured_parameters(),
                array('userids' => $userids));

list($sqluserids, $params) = $DB->get_in_or_equal($params['userids'], SQL_PARAMS_NAMED);
        $uselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
        $ujoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = u.id AND ctx.contextlevel = :contextlevel)";
        $params['contextlevel'] = CONTEXT_USER;
        $usersql = "SELECT u.* $uselect
                      FROM {user} u $ujoin
                     WHERE u.id $sqluserids";
        $users = $DB->get_recordset_sql($usersql, $params);

$result = array(
            'users' => array(),
            'warnings' => array()
        );
        $hasuserupdatecap = has_capability('moodle/user:update', context_system::instance());
        foreach ($users as $user) {

$currentuser = ($user->id == $USER->id);

if ($currentuser or $hasuserupdatecap) {

if (!empty($user->deleted)) {
                    $warning = array();
                    $warning['item'] = 'user';
                    $warning['itemid'] = $user->id;
                    $warning['warningcode'] = '1';
                    $warning['message'] = "User $user->id was deleted";
                    $result['warnings'][] = $warning;
                    continue;
                }

$preferences = array();
                $preferences['userid'] = $user->id;
                $preferences['configured'] = 0;

// Now we get for all the providers and all the states
                // the user preferences to check if at least one is enabled for airnotifier plugin.
                $providers = message_get_providers_for_user($user->id);
                $configured = false;

foreach ($providers as $provider) {
                    if ($configured) {
                        break;
                    }

foreach (array('loggedin', 'loggedoff') as $state) {

$prefstocheck = array();
                        $prefname = 'message_provider_'.$provider->component.'_'.$provider->name.'_'.$state;

// First get forced settings.
                        if ($forcedpref = get_config('message', $prefname)) {
                            $prefstocheck = array_merge($prefstocheck, explode(',', $forcedpref));
                        }

// Then get user settings.
                        if ($userpref = get_user_preferences($prefname, '', $user->id)) {
                            $prefstocheck = array_merge($prefstocheck, explode(',', $userpref));
                        }

if (in_array('airnotifier', $prefstocheck)) {
                            $preferences['configured'] = 1;
                            $configured = true;
                            break;
                        }

}
                }

$result['users'][] = $preferences;
            } else if (!$hasuserupdatecap) {
                $warning = array();
                $warning['item'] = 'user';
                $warning['itemid'] = $user->id;
                $warning['warningcode'] = '2';
                $warning['message'] = "You don't have permissions for view user $user->id preferences";
                $result['warnings'][] = $warning;
            }

}
        $users->close();

return $result;
    }

/**
     * Returns description of method result value
     *
     * @return external_single_structure
     * @since Moodle 2.7
     */
    public static function are_notification_preferences_configured_returns() {
        return new external_single_structure(
            array(
                'users' => new external_multiple_structure(
                    new external_single_structure(
                        array (
                            'userid'     => new external_value(PARAM_INT, 'userid id'),
                            'configured' => new external_value(PARAM_INT,
                                '1 if the user preferences have been configured and 0 if not')
                        )
                    ),
                    'list of preferences by user'),
                'warnings' => new external_warnings()
            )
        );
    }

/**
     * Returns description of method parameters
     *
     * @since Moodle 3.2
     */
    public static function get_user_devices_parameters() {
        return new external_function_parameters(
            array(
                'appid' => new external_value(PARAM_NOTAGS, 'App unique id (usually a reversed domain)'),
                'userid' => new external_value(PARAM_INT, 'User id, 0 for current user', VALUE_DEFAULT, 0)
            )
        );
    }

/**
     * Return the list of mobile devices that are registered in Moodle for the given user.
     *
     * @param  string  $appid  app unique id (usually a reversed domain)
     * @param  integer $userid the user id, 0 for current user
     * @return array warnings and devices
     * @throws moodle_exception
     * @since Moodle 3.2
     */
    public static function get_user_devices($appid, $userid = 0) {
        global $USER;

$params = self::validate_parameters(
            self::get_user_devices_parameters(),
            array(
                'appid' => $appid,
                'userid' => $userid,
            )
        );

$context = context_system::instance();
        self::validate_context($context);

if (empty($params['userid'])) {
            $user = $USER;
        } else {
            $user = core_user::get_user($params['userid'], '*', MUST_EXIST);
            core_user::require_active_user($user);
            // Allow only admins to retrieve other users devices.
            if ($user->id != $USER->id) {
                require_capability('moodle/site:config', $context);
            }
        }

$warnings = array();
        $devices = array();
        // Check if mobile notifications are enabled.
        if (!self::is_system_configured()) {
            $warnings[] = array(
                'item' => 'user',
                'itemid' => $user->id,
                'warningcode' => 'systemnotconfigured',
                'message' => 'Mobile notifications are not configured'
            );
        } else {
            // We catch exceptions here because get_user_devices may try to connect to Airnotifier.
            try {
                $manager = new message_airnotifier_manager();
                $devices = $manager->get_user_devices($appid, $user->id);
            } catch (Exception $e) {
                $warnings[] = array(
                    'item' => 'user',
                    'itemid' => $user->id,
                    'warningcode' => 'errorgettingdevices',
                    'message' => $e->getMessage()
                );
            }
        }

return array(
            'devices' => $devices,
            'warnings' => $warnings
        );
    }

/**
     * Returns description of method result value
     *
     * @return external_single_structure
     * @since Moodle 3.2
     */
    public static function get_user_devices_returns() {
        return new external_single_structure(
            array(
                'devices' => new external_multiple_structure(
                    new external_single_structure(
                        array (
                            'id' => new external_value(PARAM_INT, 'Device id (in the message_airnotifier table)'),
                            'appid' => new external_value(PARAM_NOTAGS, 'The app id, something like com.moodle.moodlemobile'),
                            'name' => new external_value(PARAM_NOTAGS, 'The device name, \'occam\' or \'iPhone\' etc.'),
                            'model' => new external_value(PARAM_NOTAGS, 'The device model \'Nexus4\' or \'iPad1,1\' etc.'),
                            'platform' => new external_value(PARAM_NOTAGS, 'The device platform \'iOS\' or \'Android\' etc.'),
                            'version' => new external_value(PARAM_NOTAGS, 'The device version \'6.1.2\' or \'4.2.2\' etc.'),
                            'pushid' => new external_value(PARAM_RAW, 'The device PUSH token/key/identifier/registration id'),
                            'uuid' => new external_value(PARAM_RAW, 'The device UUID'),
                            'enable' => new external_value(PARAM_INT, 'Whether the device is enabled or not'),
                            'timecreated' => new external_value(PARAM_INT, 'Time created'),
                            'timemodified' => new external_value(PARAM_INT, 'Time modified'),
                        )
                    ),
                    'List of devices'
                ),
                'warnings' => new external_warnings()
            )
        );
    }

/**
     * Returns description of method parameters
     *
     * @since Moodle 3.2
     */
    public static function enable_device_parameters() {
        return new external_function_parameters(
            array(
                'deviceid' => new external_value(PARAM_INT, 'The device id'),
                'enable' => new external_value(PARAM_BOOL, 'True for enable the device, false otherwise')
            )
        );
    }

/**
     * Enables or disables a registered user device so it can receive Push notifications
     *
     * @param  integer $deviceid the device id
     * @param  bool $enable whether to enable the device
     * @return array warnings and success status
     * @throws moodle_exception
     * @since Moodle 3.2
     */
    public static function enable_device($deviceid, $enable) {
        global $USER;

$params = self::validate_parameters(
            self::enable_device_parameters(),
            array(
                'deviceid' => $deviceid,
                'enable' => $enable,
            )
        );

$context = context_system::instance();
        self::validate_context($context);
        require_capability('message/airnotifier:managedevice', $context);

if (!message_airnotifier_manager::enable_device($params['deviceid'], $params['enable'])) {
            throw new moodle_exception('unknowndevice', 'message_airnotifier');
        }

return array(
            'success' => true,
            'warnings' => array()
        );
    }

/**
     * Returns description of method result value
     *
     * @return external_single_structure
     * @since Moodle 3.2
     */
    public static function enable_device_returns() {
        return new external_single_structure(
            array(
                'success' => new external_value(PARAM_BOOL, 'True if success'),
                'warnings' => new external_warnings()
            )
        );
    }
}