<?php
/**
 *  Copyright (C) 2011  Kai Dorschner
 *
 *  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 <http://www.gnu.org/licenses/>.
 *
 * @author Kai Dorschner <the-hide@address.com>
 * @copyright Copyright 2011, Kai Dorschner
 * @license http://www.gnu.org/licenses/gpl.html GPLv3
 * @package mocovi
 */

class_exists('Renderer')	or require $GLOBALS['library'].'Renderer.php';

class pdfRenderer extends Renderer
{

	protected $fo, $pdf, $tmp;

	public function render($string)
	{
		$this->createFOFile($string);
		$this->createPDFFile();
		$this->renderPDF();
		$pdfContents = file_get_contents($this->pdf);
		$this->cleanup();
		$GLOBALS['header']->contentType('application/pdf');
		$GLOBALS['header']->contentDisposition(basename($GLOBALS['path']), 'inline');
		//$GLOBALS['header']->contentLength(strlen($pdfContents)); // @todo Can't use this line, it produces not the correct contentLength!
		return $pdfContents;
	}

	protected function createFOFile($content)
	{
		$this->fo = $this->createTempFile('.mocovi.fo', $content);
		if(!is_file($this->fo) || !is_readable($this->fo))
			$this->error('File '.$this->fo.' not found or not readable.');
	}

	protected function createPDFFile()
	{
		$this->pdf = $this->tmp.'.mocovi.pdf';
	}

	protected function createTempName()
	{
		if(strlen($this->tmp) <= 0)
			$this->tmp = tempnam(sys_get_temp_dir(), '');
	}

	protected function createTempFile($suffix, $content = '')
	{
		$this->createTempName();
		$path = $this->tmp.$suffix;
		//file_put_contents($path, $content); // short variant
		if($handle = fopen($path, 'w'))
		{
			fwrite($handle, $content);
			fclose($handle);
		}
		else
			$this->error($path. ' cannot be created.');
		chmod($path, 0777);
		return $path;
	}

	protected function renderPDF()
	{
		exec('fop -fo '.$this->fo.' -pdf '.$this->pdf, $exec);
		if(!is_file($this->pdf))
			$this->error('An error occured in Apache FOP while rendering the PDF.');
	}

	protected function error($string)
	{
		$this->cleanup();
		throw new MvcException($string);
	}

	protected function cleanup()
	{
		if(is_file($this->fo))
			unlink($this->fo);
		if(is_file($this->pdf))
			unlink($this->pdf);
	}
}