<?php
/**
* handler for performing changes when shard is back online after being offline.
* the sync class is responsible for the syncdata function, which will synchronise the website with the shard
* (when the shard is offline, users can still change their password, email or even register)
* @author Daan Janssens, mentored by Matthew Lagoe
*/
class Sync{
    
    /**
     * performs the actions listed in the querycache.
     * All entries in the querycache will be read and performed depending on their type.
     * This is done because the shard could have been offline and we want changes made on the website (which is still online) to eventually hit the shard.
     * These changes are: createPermissions, createUser, change_pass, change_mail
     */
    static public function syncdata ($display = true) {
    
    if (function_exists('pcntl_fork')) {
        $pid = pcntl_fork();
    }
    $pidfile = '/tmp/ams_cron_pid';
    
        if(isset($pid)) {
        // We're the main process.
        } else {
            if(!file_exists($pidfile)) {
                $pid = getmypid();
                $file = fopen($pidfile, 'w');
                    
                fwrite($file, $pid);
                fclose($file);

                try {
                    $dbl = new DBLayer("lib");
                    $statement = $dbl->executeWithoutParams("SELECT * FROM ams_querycache");
                    $rows = $statement->fetchAll();           
                    foreach ($rows as $record) {
                        
                        $db = new DBLayer($record['db']);
                        switch($record['type']) {
                            case 'createPermissions':
                                $decode = json_decode($record['query']);
                                $values = array('username' => $decode[0]);
                                //make connection with and put into shard db & delete from the lib
                                $sth = $db->execute("SELECT UId FROM user WHERE Login= :username;", $values);
                                $result = $sth->fetchAll();
                                foreach ($result as $UId) {
                                    $ins_values = array('id' => $UId['UId']);
                                    $db->execute("INSERT INTO permission (UId, ClientApplication, AccessPrivilege) VALUES (:id, 'r2', 'OPEN');", $ins_values);
                                    $db->execute("INSERT INTO permission (UId, ClientApplication, AccessPrivilege) VALUES (:id , 'ryzom_open', 'OPEN');", $ins_values);
                                }
                                break;
                            case 'change_pass':
                                $decode = json_decode($record['query']);
                                $values = array('user' => $decode[0], 'pass' => $decode[1]);
                                //make connection with and put into shard db & delete from the lib
                                $db->execute("UPDATE user SET Password = :pass WHERE Login = :user",$values);              
                                break;
                            case 'change_mail':
                                $decode = json_decode($record['query']);
                                $values = array('user' => $decode[0], 'mail' => $decode[1]);
                                //make connection with and put into shard db & delete from the lib
                                $db->execute("UPDATE user SET Email = :mail WHERE Login = :user",$values);              
                                break;
                            case 'createUser': 
                                $decode = json_decode($record['query']);
                                $values = array('login' => $decode[0], 'pass' => $decode[1], 'mail' => $decode[2] );
                                //make connection with and put into shard db & delete from the lib
                                $db->execute("INSERT INTO user (Login, Password, Email) VALUES (:login, :pass, :mail)",$values);              
                                break;
                        }
                        $dbl->execute("DELETE FROM ams_querycache WHERE SID=:SID",array('SID' => $record['SID']));
                    }
                    if ($display == true) {
                        print('Syncing completed');
                    }
                }
                catch (PDOException $e) {
                    if ($display == true) {
                        print('Something went wrong! The shard is probably still offline!');
                        print_r($e);
                    }
                }
                unlink($pidfile);
            }

        }
    }
}