<?php

namespace dokuwiki;

use dokuwiki\Ui;
use dokuwiki\Utf8\Sort;

/**
 * Manage all builtin AJAX calls
 *
 * @todo The calls should be refactored out to their own proper classes
 * @package dokuwiki
 */
class Ajax {

    /**
     * Execute the given call
     *
     * @param string $call name of the ajax call
     */
    public function __construct($call) {
        $callfn = 'call' . ucfirst($call);
        if(method_exists($this, $callfn)) {
            $this->$callfn();
        } else {
            $evt = new Extension\Event('AJAX_CALL_UNKNOWN', $call);
            if($evt->advise_before()) {
                print "AJAX call '" . hsc($call) . "' unknown!\n";
            } else {
                $evt->advise_after();
                unset($evt);
            }
        }
    }

    /**
     * Searches for matching pagenames
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function callQsearch() {
        global $lang;
        global $INPUT;

        $maxnumbersuggestions = 50;

        $query = $INPUT->post->str('q');
        if(empty($query)) $query = $INPUT->get->str('q');
        if(empty($query)) return;

        $query = urldecode($query);

        $data = ft_pageLookup($query, true, useHeading('navigation'));

        if(!count($data)) return;

        print '<strong>' . $lang['quickhits'] . '</strong>';
        print '<ul>';
        $counter = 0;
        foreach($data as $id => $title) {
            if(useHeading('navigation')) {
                $name = $title;
            } else {
                $ns = getNS($id);
                if($ns) {
                    $name = noNS($id) . ' (' . $ns . ')';
                } else {
                    $name = $id;
                }
            }
            echo '<li>' . html_wikilink(':' . $id, $name) . '</li>';

            $counter++;
            if($counter > $maxnumbersuggestions) {
                echo '<li>...</li>';
                break;
            }
        }
        print '</ul>';
    }

    /**
     * Support OpenSearch suggestions
     *
     * @link   http://www.opensearch.org/Specifications/OpenSearch/Extensions/Suggestions/1.0
     * @author Mike Frysinger <vapier@gentoo.org>
     */
    protected function callSuggestions() {
        global $INPUT;

        $query = cleanID($INPUT->post->str('q'));
        if(empty($query)) $query = cleanID($INPUT->get->str('q'));
        if(empty($query)) return;

        $data = ft_pageLookup($query);
        if(!count($data)) return;
        $data = array_keys($data);

        // limit results to 15 hits
        $data = array_slice($data, 0, 15);
        $data = array_map('trim', $data);
        $data = array_map('noNS', $data);
        $data = array_unique($data);
        Sort::sort($data);

        /* now construct a json */
        $suggestions = array(
            $query,  // the original query
            $data,   // some suggestions
            array(), // no description
            array()  // no urls
        );

        header('Content-Type: application/x-suggestions+json');
        print json_encode($suggestions);
    }

    /**
     * Refresh a page lock and save draft
     *
     * Andreas Gohr <andi@splitbrain.org>
     */
    protected function callLock() {
        global $ID;
        global $INFO;
        global $INPUT;

        $ID = cleanID($INPUT->post->str('id'));
        if(empty($ID)) return;

        $INFO = pageinfo();

        $response = [
            'errors' => [],
            'lock' => '0',
            'draft' => '',
        ];
        if(!$INFO['writable']) {
            $response['errors'][] = 'Permission to write this page has been denied.';
            echo json_encode($response);
            return;
        }

        if(!checklock($ID)) {
            lock($ID);
            $response['lock'] = '1';
        }

        $draft = new Draft($ID, $INFO['client']);
        if ($draft->saveDraft()) {
            $response['draft'] = $draft->getDraftMessage();
        } else {
            $response['errors'] = array_merge($response['errors'], $draft->getErrors());
        }
        echo json_encode($response);
    }

    /**
     * Delete a draft
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function callDraftdel() {
        global $INPUT;
        $id = cleanID($INPUT->str('id'));
        if(empty($id)) return;

        $client = $_SERVER['REMOTE_USER'];
        if(!$client) $client = clientIP(true);

        $draft = new Draft($id, $client);
        if ($draft->isDraftAvailable() && checkSecurityToken()) {
            $draft->deleteDraft();
        }
    }

    /**
     * Return subnamespaces for the Mediamanager
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function callMedians() {
        global $conf;
        global $INPUT;

        // wanted namespace
        $ns = cleanID($INPUT->post->str('ns'));
        $dir = utf8_encodeFN(str_replace(':', '/', $ns));

        $lvl = count(explode(':', $ns));

        $data = array();
        search($data, $conf['mediadir'], 'search_index', array('nofiles' => true), $dir);
        foreach(array_keys($data) as $item) {
            $data[$item]['level'] = $lvl + 1;
        }
        echo html_buildlist($data, 'idx', 'media_nstree_item', 'media_nstree_li');
    }

    /**
     * Return list of files for the Mediamanager
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function callMedialist() {
        global $NS;
        global $INPUT;

        $NS = cleanID($INPUT->post->str('ns'));
        $sort = $INPUT->post->bool('recent') ? 'date' : 'natural';
        if($INPUT->post->str('do') == 'media') {
            tpl_mediaFileList();
        } else {
            tpl_mediaContent(true, $sort);
        }
    }

    /**
     * Return the content of the right column
     * (image details) for the Mediamanager
     *
     * @author Kate Arzamastseva <pshns@ukr.net>
     */
    protected function callMediadetails() {
        global $IMG, $JUMPTO, $REV, $fullscreen, $INPUT;
        $fullscreen = true;
        require_once(DOKU_INC . 'lib/exe/mediamanager.php');

        $image = '';
        if($INPUT->has('image')) $image = cleanID($INPUT->str('image'));
        if(isset($IMG)) $image = $IMG;
        if(isset($JUMPTO)) $image = $JUMPTO;
        $rev = false;
        if(isset($REV) && !$JUMPTO) $rev = $REV;

        html_msgarea();
        tpl_mediaFileDetails($image, $rev);
    }

    /**
     * Returns image diff representation for mediamanager
     *
     * @author Kate Arzamastseva <pshns@ukr.net>
     */
    protected function callMediadiff() {
        global $INPUT;

        $image = '';
        if($INPUT->has('image')) $image = cleanID($INPUT->str('image'));
        (new Ui\MediaDiff($image))->preference('fromAjax', true)->show();
    }

    /**
     * Manages file uploads
     *
     * @author Kate Arzamastseva <pshns@ukr.net>
     */
    protected function callMediaupload() {
        global $NS, $MSG, $INPUT;

        $id = '';
        if(isset($_FILES['qqfile']['tmp_name'])) {
            $id = $INPUT->post->str('mediaid', $_FILES['qqfile']['name']);
        } elseif($INPUT->get->has('qqfile')) {
            $id = $INPUT->get->str('qqfile');
        }

        $id = cleanID($id);

        $NS = $INPUT->str('ns');
        $ns = $NS . ':' . getNS($id);

        $AUTH = auth_quickaclcheck("$ns:*");
        if($AUTH >= AUTH_UPLOAD) {
            io_createNamespace("$ns:xxx", 'media');
        }

        if(isset($_FILES['qqfile']['error']) && $_FILES['qqfile']['error']) unset($_FILES['qqfile']);

        $res = false;
        if(isset($_FILES['qqfile']['tmp_name'])) $res = media_upload($NS, $AUTH, $_FILES['qqfile']);
        if($INPUT->get->has('qqfile')) $res = media_upload_xhr($NS, $AUTH);

        if($res) {
            $result = array(
                'success' => true,
                'link' => media_managerURL(array('ns' => $ns, 'image' => $NS . ':' . $id), '&'),
                'id' => $NS . ':' . $id,
                'ns' => $NS
            );
        } else {
            $error = '';
            if(isset($MSG)) {
                foreach($MSG as $msg) {
                    $error .= $msg['msg'];
                }
            }
            $result = array(
                'error' => $error,
                'ns' => $NS
            );
        }

        header('Content-Type: application/json');
        echo json_encode($result);
    }

    /**
     * Return sub index for index view
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function callIndex() {
        global $conf;
        global $INPUT;

        // wanted namespace
        $ns = cleanID($INPUT->post->str('idx'));
        $dir = utf8_encodeFN(str_replace(':', '/', $ns));

        $lvl = count(explode(':', $ns));

        $data = array();
        search($data, $conf['datadir'], 'search_index', array('ns' => $ns), $dir);
        foreach (array_keys($data) as $item) {
            $data[$item]['level'] = $lvl + 1;
        }
        $idx = new Ui\Index;
        echo html_buildlist($data, 'idx', [$idx,'formatListItem'], [$idx,'tagListItem']);
    }

    /**
     * List matching namespaces and pages for the link wizard
     *
     * @author Andreas Gohr <gohr@cosmocode.de>
     */
    protected function callLinkwiz() {
        global $conf;
        global $lang;
        global $INPUT;

        $q = ltrim(trim($INPUT->post->str('q')), ':');
        $id = noNS($q);
        $ns = getNS($q);

        $ns = cleanID($ns);
        $id = cleanID($id);

        $nsd = utf8_encodeFN(str_replace(':', '/', $ns));

        $data = array();
        if($q !== '' && $ns === '') {

            // use index to lookup matching pages
            $pages = ft_pageLookup($id, true);

            // If 'useheading' option is 'always' or 'content',
            // search page titles with original query as well.
            if ($conf['useheading'] == '1' || $conf['useheading'] == 'content') { 
                $pages = array_merge($pages, ft_pageLookup($q, true, true));
                asort($pages, SORT_STRING);
            }
        
            // result contains matches in pages and namespaces
            // we now extract the matching namespaces to show
            // them seperately
            $dirs = array();

            foreach($pages as $pid => $title) {
                if(strpos(getNS($pid), $id) !== false) {
                    // match was in the namespace
                    $dirs[getNS($pid)] = 1; // assoc array avoids dupes
                } else {
                    // it is a matching page, add it to the result
                    $data[] = array(
                        'id' => $pid,
                        'title' => $title,
                        'type' => 'f',
                    );
                }
                unset($pages[$pid]);
            }
            foreach($dirs as $dir => $junk) {
                $data[] = array(
                    'id' => $dir,
                    'type' => 'd',
                );
            }

        } else {

            $opts = array(
                'depth' => 1,
                'listfiles' => true,
                'listdirs' => true,
                'pagesonly' => true,
                'firsthead' => true,
                'sneakyacl' => $conf['sneaky_index'],
            );
            if($id) $opts['filematch'] = '^.*\/' . $id;
            if($id) $opts['dirmatch'] = '^.*\/' . $id;
            search($data, $conf['datadir'], 'search_universal', $opts, $nsd);

            // add back to upper
            if($ns) {
                array_unshift(
                    $data, array(
                             'id' => getNS($ns),
                             'type' => 'u',
                         )
                );
            }
        }

        // fixme sort results in a useful way ?

        if(!count($data)) {
            echo $lang['nothingfound'];
            exit;
        }

        // output the found data
        $even = 1;
        foreach($data as $item) {
            $even *= -1; //zebra

            if(($item['type'] == 'd' || $item['type'] == 'u') && $item['id'] !== '') $item['id'] .= ':';
            $link = wl($item['id']);

            echo '<div class="' . (($even > 0) ? 'even' : 'odd') . ' type_' . $item['type'] . '">';

            if($item['type'] == 'u') {
                $name = $lang['upperns'];
            } else {
                $name = hsc($item['id']);
            }

            echo '<a href="' . $link . '" title="' . hsc($item['id']) . '" class="wikilink1">' . $name . '</a>';

            if(!blank($item['title'])) {
                echo '<span>' . hsc($item['title']) . '</span>';
            }
            echo '</div>';
        }

    }

}