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<?php
class bot_help_module implements BotModule {
    const BOT_HELP_FILE = '/cache/help.cache';
    
    private $PDO;
    
    private function getHelp() {
        if(is_file(BOT_TOPDIR.self::BOT_HELP_FILE)) {
            return unserialize(file_get_contents(BOT_TOPDIR.self::BOT_HELP_FILE));
        }
        
        $st = $this->PDO->prepare('SELECT DISTINCT dir, init FROM functions ORDER BY dir ASC');
        $st->execute();
        $data = $st->fetchAll();
        
        $help = new BotMsg();
        
        foreach($data as $element) {
            $dir = $element['dir'];
            
            if(!is_file(BOT_TOPDIR.$dir.'/init.php')) {
                continue;
            }
            
            $class = include_once(BOT_TOPDIR.$dir.'/init.php');
            if($class === TRUE) {
                $class = $element['init'];
            }
            
            if(!$class || !class_exists($class, FALSE)) {
                continue;
            }
            
            $init = new $class;
            if(!($init instanceof BotModuleInit)) {
                continue;
            }
            
            $row = $init->help();
            if(!($row instanceof BotMsg)) {
                continue;
            }
            
            $help->append($row);
        }
        
        $help->append('Objaśnienie:<br />'."\n"
            . '   <i>argument</i> jest wymagany<br />'."\n"
            . '   <i>[argument]</i> jest opcjonalny');
        
        file_put_contents(BOT_TOPDIR.self::BOT_HELP_FILE, serialize($help));
        
        return $help;
    }
    
    function handle($msg, $params) {
        try {
            try {
                $this->PDO = new PDO('sqlite:'.BOT_TOPDIR.'/cache/functions.sqlite');
                $this->PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                $this->PDO->setAttribute(PDO::ATTR_ORACLE_NULLS, PDO::NULL_TO_STRING);
            }
            catch(Exception $e) {
                @unlink(BOT_TOPDIR.'/cache/functions.sqlite');
                throw $e;
            }
            
            $args = trim($msg->args);
            
            if(empty($args)) {
                return $this->getHelp();
            }
            
            $args = strtok($args, " \t\n\r\0\x0B");
            
            $st = $this->PDO->prepare('SELECT dir, init FROM functions WHERE name=? ORDER BY priority ASC');
            $st->execute(array($args));
            $data1 = $st->fetchAll();
            $st->execute(array('*'));
            $data2 = $st->fetchAll();
            
            $data = array_merge($data1, $data2);
            unset($data1, $data2);
            
            foreach($data as $func) {
                if(!is_file(BOT_TOPDIR.$func['dir'].'/init.php')) {
                    continue;
                }
                
                $class = require_once(BOT_TOPDIR.$func['dir'].'/init.php');
                if($class === TRUE) {
                    $class = $func['init'];
                }
                
                if(!$class || !class_exists($class, FALSE)) {
                    continue;
                }
            
                $init = new $class;
                if(!($init instanceof BotModuleInit)) {
                    continue;
                }
                
                $help = $init->help($args);
                if($help instanceof BotMsg) {
                    return $help;
                }
            }
        }
        catch(Exception $e) {
            return new BotMsg('Wystąpił błąd podczas pobierania pomocy dla polecenia. Komunikat:<br />'.nl2br($e));
        }
    }
}
?>