<?php


class App_Pdf_Renderer
{

    public static function render($resourceUrl, $title, array $options = array())
    {
        $options['title'] = $title;
        $file = tempnam(constant('BASE_PATH') . '/tmp', 'PDF_' . Qs_Fs::normalize($title) . '_');
        $info = self::callRenderer($resourceUrl, $file, $options);

        if (0 !== $info['code']) {
            Qs_Debug::log('Error rendering pdf: #' . $info['code'] . ($info['out'] ? PHP_EOL . implode(PHP_EOL, $info['out']) : ''));
            return null;
        }
        return $file;
    }

    public static function callRenderer($resourceUrl, $file, array $options)
    {
        $params = isset($options['params']) ? (array) $options['params'] : array();
        // gag for wkhtml2pdf authenticatation
        // see App_User_Auth, App_User_AuthAdapter
        if (App_User_Auth::getInstance()->hasIdentity() && ($userId = App_User_Auth::getInstance()->getData('id'))) {
            $params[] = '--custom-header-propagation';
            $params[] = '--custom-header x-pdf-user-id ' . intval($userId);
        }
        $pattern = self::_getRenderCmdPattern();
        $placeholders = array(
            '{pageHeader}'  => escapeshellarg($options['pageHeader']),
            '{pageFooter}'  => escapeshellarg($options['pageFooter']),
            '{title}'       => escapeshellarg($options['title']),
            '{url}'         => escapeshellarg(Qs_Auth::addAuthCredentials($resourceUrl)),
            '{file}'        => escapeshellarg($file),
            '{params}'      => implode(' ', $params),
        );
        $cmd = str_replace(array_keys($placeholders), array_values($placeholders), $pattern);
        exec($cmd, $out, $code);

        if (0 == $code && file_exists($file)) {
            chmod($file, 0644);
        }

        return array(
            'file' => $file,
            'code' => $code,
            'out'  => $out,
        );
    }

    protected static function _getRenderCmdPattern()
    {
        static $command;
        if (null === $command) {
            $cfg = Zend_Registry::get('config')->app;
            $command = $cfg->part->pdfCommand;
        }

        if (null == $command) {
            throw new Exception('PDF rendering command can not be empty');
        }

        return $command;
    }

    public static function sendTempFile($file, $name)
    {
        header('Expires: Sat, 01 Jan 2000 00:00:00 GMT');
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
        header('Cache-Control: no-cache, must-revalidate');
        header('Pragma: no-cache');
        header('Content-Type: application/pdf');
        header('Content-Disposition: inline; filename="' . self::escapeAttachmentName($name . '.pdf') . '"');
        readfile($file);
        unlink($file);
        exit;
    }

    public static function escapeAttachmentName($name)
    {
        $disabledCharacters = ['<', '>', '\\', '"', '/', ':', '|', '?', '*'];
        return str_replace($disabledCharacters, '', $name);
    }

    public static function getUniqueFileName($filename)
    {
        $pathInfo = pathinfo($filename);
        $index = 0;
        $uniqueName = $filename;
        while (file_exists($uniqueName) && $index <= 20) {
            ++$index;
            $uniqueName = $pathInfo['dirname'] . '/' . $pathInfo['filename'] . ' (' . $index . ').' . $pathInfo['extension'];
        }
        return $index > 20 ? false : $uniqueName;
    }

}