<?php
/**
 * dw2Pdf Plugin: Conversion from dokuwiki content to pdf.
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Luigi Micco <l.micco@tiscali.it>
 * @author     Andreas Gohr <andi@splitbrain.org>
 */

// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();

/**
 * Class action_plugin_dw2pdf
 *
 * Export hmtl content to pdf, for different url parameter configurations
 * DokuPDF which extends mPDF is used for generating the pdf from html.
 */
class action_plugin_dw2pdf extends DokuWiki_Action_Plugin {

    private $tpl;

    /**
     * Constructor. Sets the correct template
     */
    public function __construct() {
        $tpl = false;
        if(isset($_REQUEST['tpl'])) {
            $tpl = trim(preg_replace('/[^A-Za-z0-9_\-]+/', '', $_REQUEST['tpl']));
        }
        if(!$tpl) $tpl = $this->getConf('template');
        if(!$tpl) $tpl = 'default';
        if(!is_dir(DOKU_PLUGIN . 'dw2pdf/tpl/' . $tpl)) $tpl = 'default';

        $this->tpl = $tpl;
    }

    /**
     * Register the events
     */
    public function register(Doku_Event_Handler $controller) {
        $controller->register_hook('ACTION_ACT_PREPROCESS', 'BEFORE', $this, 'convert', array());
        $controller->register_hook('TEMPLATE_PAGETOOLS_DISPLAY', 'BEFORE', $this, 'addbutton', array());
    }

    /**
     * Do the HTML to PDF conversion work
     *
     * @param Doku_Event $event
     * @param array      $param
     * @return bool
     */
    public function convert(&$event, $param) {
        global $ACT;
        global $REV;
        global $ID;
        global $INPUT, $conf;

        // our event?
        if(($ACT != 'export_pdfbook') && ($ACT != 'export_pdf') && ($ACT != 'export_pdfns')) return false;

        // check user's rights
        if(auth_quickaclcheck($ID) < AUTH_READ) return false;

        // one or multiple pages?
        $list = array();

        if($ACT == 'export_pdf') {
            $list[0] = $ID;
            $title = p_get_first_heading($ID);

        } elseif($ACT == 'export_pdfns') {
            //check input for title and ns
            if(!$title = $INPUT->str('pdfns_title')) {
                $this->showPageWithErrorMsg($event, 'needtitle');
                return false;
            }
            $pdfnamespace = cleanID($INPUT->str('pdfns_ns'));
            if(!@is_dir(dirname(wikiFN($pdfnamespace . ':dummy')))) {
                $this->showPageWithErrorMsg($event, 'needns');
                return false;
            }

            //sort order
            $order = $INPUT->str('pdfns_order', 'natural', true);
            $sortoptions = array('pagename', 'date', 'natural');
            if(!in_array($order, $sortoptions)) {
                $order = 'natural';
            }

            //search depth
            $depth = $INPUT->int('pdfns_depth', 0);
            if($depth < 0) {
                $depth = 0;
            }

            //page search
            $result = array();
            $opts = array('depth' => $depth); //recursive all levels
            $dir = utf8_encodeFN(str_replace(':', '/', $pdfnamespace));
            search($result, $conf['datadir'], 'search_allpages', $opts, $dir);

            //sorting
            if(count($result) > 0) {
                if($order == 'date') {
                    usort($result, array($this, '_datesort'));
                } elseif($order == 'pagename') {
                    usort($result, array($this, '_pagenamesort'));
                }
            }

            foreach($result as $item) {
                $list[] = $item['id'];
            }

        } elseif(isset($_COOKIE['list-pagelist']) && !empty($_COOKIE['list-pagelist'])) {
            //is in Bookmanager of bookcreator plugin a title given?
            if(!$title = $INPUT->str('pdfbook_title')) { //TODO when title is changed, the cached file contains the old title
                $this->showPageWithErrorMsg($event, 'needtitle');
                return false;
            } else {
                $list = explode("|", $_COOKIE['list-pagelist']);
            }

        } else {
            //show empty bookcreator message
            $this->showPageWithErrorMsg($event, 'empty');
            return false;
        }

        // it's ours, no one else's
        $event->preventDefault();

        // decide on the paper setup from param or config
        $pagesize    = $INPUT->str('pagesize', $this->getConf('pagesize'), true);
        $orientation = $INPUT->str('orientation', $this->getConf('orientation'), true);

        // prepare cache
        $cache = new cache(join(',', $list) . $REV . $this->tpl . $pagesize . $orientation, '.dw2.pdf');
        $depends['files']   = array_map('wikiFN', $list);
        $depends['files'][] = __FILE__;
        $depends['files'][] = dirname(__FILE__) . '/renderer.php';
        $depends['files'][] = dirname(__FILE__) . '/mpdf/mpdf.php';
        $depends['files']   = array_merge($depends['files'], getConfigFiles('main'));

        // hard work only when no cache available
        if(!$this->getConf('usecache') || !$cache->useCache($depends)) {
            // initialize PDF library
            require_once(dirname(__FILE__) . "/DokuPDF.class.php");

            $mpdf = new DokuPDF($pagesize, $orientation);

            // let mpdf fix local links
            $self = parse_url(DOKU_URL);
            $url = $self['scheme'] . '://' . $self['host'];
            if($self['port']) $url .= ':' . $self['port'];
            $mpdf->setBasePath($url);

            // Set the title
            $mpdf->SetTitle($title);

            // some default settings
            $mpdf->mirrorMargins = 1;
            $mpdf->useOddEven    = 1;
            $mpdf->setAutoTopMargin = 'stretch';
            $mpdf->setAutoBottomMargin = 'stretch';

            // load the template
            $template = $this->load_template($title);

            // prepare HTML header styles
            $html  = '<html><head>';
            $html .= '<style type="text/css">';
            $html .= $this->load_css();
            $html .= '@page { size:auto; ' . $template['page'] . '}';
            $html .= '@page :first {' . $template['first'] . '}';
            $html .= '</style>';
            $html .= '</head><body>';
            $html .= $template['html'];
            $html .= '<div class="dokuwiki">';

            // insert the cover page
            $html .= $template['cover'];

            // loop over all pages
            $cnt = count($list);
            for($n = 0; $n < $cnt; $n++) {
                $page = $list[$n];

                $html .= p_cached_output(wikiFN($page, $REV), 'dw2pdf', $page);
                $html .= $this->page_depend_replacements($template['cite'], cleanID($page));
                if($n < ($cnt - 1)) {
                    $html .= '<pagebreak />';
                }
            }

            // insert the back page
            $html .= $template['back'];

            $html .= '</div>';
            $html .= '</body>';
            $html .= '</html>';

            //Return html for debugging
            if($conf['allowdebug'] && $_GET['debughtml'] == 'html') {
                echo $html;
                exit();
            };

            $mpdf->WriteHTML($html);

            // write to cache file
            $mpdf->Output($cache->cache, 'F');
        }

        // deliver the file
        header('Content-Type: application/pdf');
        header('Cache-Control: must-revalidate, no-transform, post-check=0, pre-check=0');
        header('Pragma: public');
        http_conditionalRequest(filemtime($cache->cache));

        $filename = rawurlencode(cleanID(strtr($title, ':/;"', '    ')));
        if($this->getConf('output') == 'file') {
            header('Content-Disposition: attachment; filename="' . $filename . '.pdf";');
        } else {
            header('Content-Disposition: inline; filename="' . $filename . '.pdf";');
        }

        //try to send file, and exit if done
        http_sendfile($cache->cache);

        $fp = @fopen($cache->cache, "rb");
        if($fp) {
            http_rangeRequest($fp, filesize($cache->cache), 'application/pdf');
        } else {
            header("HTTP/1.0 500 Internal Server Error");
            print "Could not read file - bad permissions?";
        }
        exit();
    }

    /**
     * Add 'export pdf'-button to pagetools
     *
     * @param Doku_Event $event
     * @param mixed      $param not defined
     */
    public function addbutton(&$event, $param) {
        global $ID, $REV;

        if($this->getConf('showexportbutton') && $event->data['view'] == 'main') {
            $params = array('do' => 'export_pdf');
            if($REV) $params['rev'] = $REV;

            // insert button at position before last (up to top)
            $event->data['items'] = array_slice($event->data['items'], 0, -1, true) +
                                    array('export_pdf' =>
                                          '<li>'
                                          . '<a href=' . wl($ID, $params) . '  class="action export_pdf" rel="nofollow" title="' . $this->getLang('export_pdf_button') . '">'
                                          . '<span>' . $this->getLang('export_pdf_button') . '</span>'
                                          . '</a>'
                                          . '</li>'
                                    ) +
                                    array_slice($event->data['items'], -1, 1, true);
        }
    }

    /**
     * Load the various template files and prepare the HTML/CSS for insertion
     */
    protected function load_template($title) {
        global $ID;
        global $conf;
        $tpl = $this->tpl;

        // this is what we'll return
        $output = array(
            'cover' => '',
            'html'  => '',
            'page'  => '',
            'first' => '',
            'cite'  => '',
        );

        // prepare header/footer elements
        $html = '';
        foreach(array('header', 'footer') as $section) {
            foreach(array('', '_odd', '_even', '_first') as $order) {
                $file = DOKU_PLUGIN . 'dw2pdf/tpl/' . $tpl . '/' . $section . $order . '.html';
                if(file_exists($file)) {
                    $html .= '<htmlpage' . $section . ' name="' . $section . $order . '">' . DOKU_LF;
                    $html .= file_get_contents($file) . DOKU_LF;
                    $html .= '</htmlpage' . $section . '>' . DOKU_LF;

                    // register the needed pseudo CSS
                    if($order == '_first') {
                        $output['first'] .= $section . ': html_' . $section . $order . ';' . DOKU_LF;
                    } elseif($order == '_even') {
                        $output['page'] .= 'even-' . $section . '-name: html_' . $section . $order . ';' . DOKU_LF;
                    } elseif($order == '_odd') {
                        $output['page'] .= 'odd-' . $section . '-name: html_' . $section . $order . ';' . DOKU_LF;
                    } else {
                        $output['page'] .= $section . ': html_' . $section . $order . ';' . DOKU_LF;
                    }
                }
            }
        }

        // prepare replacements
        $replace = array(
            '@PAGE@'    => '{PAGENO}',
            '@PAGES@'   => '{nb}',
            '@TITLE@'   => hsc($title),
            '@WIKI@'    => $conf['title'],
            '@WIKIURL@' => DOKU_URL,
            '@DATE@'    => dformat(time()),
            '@BASE@'    => DOKU_BASE,
            '@TPLBASE@' => DOKU_BASE . 'lib/plugins/dw2pdf/tpl/' . $tpl . '/'
        );

        // set HTML element
        $html = str_replace(array_keys($replace), array_values($replace), $html);
        //TODO For bookcreator $ID (= bookmanager page) makes no sense
        $output['html'] = $this->page_depend_replacements($html, $ID);

        // cover page
        $coverfile = DOKU_PLUGIN . 'dw2pdf/tpl/' . $tpl . '/cover.html';
        if(file_exists($coverfile)) {
            $output['cover'] = file_get_contents($coverfile);
            $output['cover'] = str_replace(array_keys($replace), array_values($replace), $output['cover']);
            $output['cover'] .= '<pagebreak />';
        }

        // cover page
        $backfile = DOKU_PLUGIN . 'dw2pdf/tpl/' . $tpl . '/back.html';
        if(file_exists($backfile)) {
            $output['back'] = '<pagebreak />';
            $output['back'] .= file_get_contents($backfile);
            $output['back'] = str_replace(array_keys($replace), array_values($replace), $output['back']);
        }

        // citation box
        $citationfile = DOKU_PLUGIN . 'dw2pdf/tpl/' . $tpl . '/citation.html';
        if(file_exists($citationfile)) {
            $output['cite'] = file_get_contents($citationfile);
            $output['cite'] = str_replace(array_keys($replace), array_values($replace), $output['cite']);
        }

        return $output;
    }

    /**
     * @param string $raw code with placeholders
     * @param string $id  pageid
     * @return string
     */
    protected function page_depend_replacements($raw, $id) {
        global $REV;

        // generate qr code for this page using google infographics api
        $qr_code = '';
        if($this->getConf('qrcodesize')) {
            $url = urlencode(wl($id, '', '&', true));
            $qr_code = '<img src="https://chart.googleapis.com/chart?chs=' .
                $this->getConf('qrcodesize') . '&cht=qr&chl=' . $url . '" />';
        }
        // prepare replacements
        $replace['@ID@']      = $id;
        $replace['@UPDATE@']  = dformat(filemtime(wikiFN($id, $REV)));
        $replace['@PAGEURL@'] = wl($id, ($REV) ? array('rev' => $REV) : false, true, "&");
        $replace['@QRCODE@']  = $qr_code;

        return str_replace(array_keys($replace), array_values($replace), $raw);
    }

    /**
     * Load all the style sheets and apply the needed replacements
     */
    protected function load_css() {
        global $conf;
        //reusue the CSS dispatcher functions without triggering the main function
        define('SIMPLE_TEST', 1);
        require_once(DOKU_INC . 'lib/exe/css.php');

        // prepare CSS files
        $files = array_merge(
            array(
                DOKU_INC . 'lib/styles/screen.css'
                    => DOKU_BASE . 'lib/styles/',
                DOKU_INC . 'lib/styles/print.css'
                    => DOKU_BASE . 'lib/styles/',
            ),
            css_pluginstyles('all'),
            $this->css_pluginPDFstyles(),
            array(
                DOKU_PLUGIN . 'dw2pdf/conf/style.css'
                    => DOKU_BASE . 'lib/plugins/dw2pdf/conf/',
                DOKU_PLUGIN . 'dw2pdf/tpl/' . $this->tpl . '/style.css'
                    => DOKU_BASE . 'lib/plugins/dw2pdf/tpl/' . $this->tpl . '/',
                DOKU_PLUGIN . 'dw2pdf/conf/style.local.css'
                    => DOKU_BASE . 'lib/plugins/dw2pdf/conf/',
            )
        );
        $css = '';
        foreach($files as $file => $location) {
            $display = str_replace(fullpath(DOKU_INC), '', fullpath($file));
            $css .= "\n/* XXXXXXXXX $display XXXXXXXXX */\n";
            $css .= css_loadfile($file, $location);
        }

        if(function_exists('css_parseless')) {
            // apply pattern replacements
            $styleini = css_styleini($conf['template']);
            $css = css_applystyle($css, $styleini['replacements']);

            // parse less
            $css = css_parseless($css);
        } else {
            // @deprecated 2013-12-19: fix backward compatibility
            $css = css_applystyle($css, DOKU_INC . 'lib/tpl/' . $conf['template'] . '/');
        }

        return $css;
    }

    /**
     * Returns a list of possible Plugin PDF Styles
     *
     * Checks for a pdf.css, falls back to print.css
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function css_pluginPDFstyles() {
        $list = array();
        $plugins = plugin_list();

        $usestyle = explode(',', $this->getConf('usestyles'));
        foreach($plugins as $p) {
            if(in_array($p, $usestyle)) {
                $list[DOKU_PLUGIN . "$p/screen.css"] = DOKU_BASE . "lib/plugins/$p/";
                $list[DOKU_PLUGIN . "$p/style.css"] = DOKU_BASE . "lib/plugins/$p/";
            }

            if(file_exists(DOKU_PLUGIN . "$p/pdf.css")) {
                $list[DOKU_PLUGIN . "$p/pdf.css"] = DOKU_BASE . "lib/plugins/$p/";
            } else {
                $list[DOKU_PLUGIN . "$p/print.css"] = DOKU_BASE . "lib/plugins/$p/";
            }
        }
        return $list;
    }

    /**
     * usort callback to sort by file lastmodified time
     */
    public function _datesort($a, $b) {
        if($b['rev'] < $a['rev']) return -1;
        if($b['rev'] > $a['rev']) return 1;
        return strcmp($b['id'], $a['id']);
    }

    /**
     * usort callback to sort by page id
     */
    public function _pagenamesort($a, $b) {
        if($a['id'] <= $b['id']) return -1;
        if($a['id'] > $b['id']) return 1;
        return 0;
    }

    /**
     * Set error notification and reload page again
     *
     * @param Doku_Event $event
     * @param string     $msglangkey key of translation key
     */
    private function showPageWithErrorMsg(&$event, $msglangkey) {
        msg($this->getLang($msglangkey), -1);

        $event->data = 'show';
        $_SERVER['REQUEST_METHOD'] = 'POST'; //clears url
    }
}