<?php
/**
 * The Horde_Mime_Viewer_Msexcel class renders out Microsoft Excel
 * documents in HTML format by using the Gnumeric package.
 *
 * Copyright 1999-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @author   Anil Madhavapeddy <anil@recoil.org>
 * @author   Michael Slusarz <slusarz@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @package  Mime_Viewer
 */
class Horde_Mime_Viewer_Msexcel extends Horde_Mime_Viewer_Base
{
    /**
     * This driver's display capabilities.
     *
     * @var array
     */
    protected $_capability = array(
        'full' => true,
        'info' => false,
        'inline' => false,
        'raw' => false
    );

    /**
     * Constructor.
     *
     * @param Horde_Mime_Part $mime_part  The object with the data to be
     *                                    rendered.
     * @param array $conf                 Configuration:
     * <pre>
     * 'location' - (string) Location of the gnumeric binary.
     * </pre>
     *
     * @throws InvalidArgumentException
     */
    public function __construct(Horde_Mime_Part $part, array $conf = array())
    {
        $this->_required = array_merge($this->_required, array(
            'location'
        ));

        parent::__construct($part, $conf);
    }

    /**
     * Return the full rendered version of the Horde_Mime_Part object.
     *
     * @return array  See parent::render().
     */
    protected function _render()
    {
        /* Check to make sure the viewer program exists. */
        if (!($location = $this->getConfigParam('location')) ||
            !file_exists($location)) {
            return array();
        }

        $process = proc_open(
            escapeshellcmd($location) . ' --import-type=Gnumeric_Excel:excel --export-type=Gnumeric_html:html40 fd://0 fd://1',
            array(
                0 => array('pipe', 'r'),
                1 => array('pipe', 'w')
            ),
            $pipes
        );

        if (is_resource($process)) {
            fwrite($pipes[0], $this->_mimepart->getContents());
            fclose($pipes[0]);

            $out = stream_get_contents($pipes[1]);
            fclose($pipes[1]);
        } else {
            $out = '';
        }

        return $this->_renderReturn(
            $out,
            'text/html; charset=UTF-8'
        );
    }

}
