<?php

/**
 * DokuWiki template functions
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Andreas Gohr <andi@splitbrain.org>
 */

use dokuwiki\ActionRouter;
use dokuwiki\Action\Exception\FatalException;
use dokuwiki\Extension\PluginInterface;
use dokuwiki\Ui\Admin;
use dokuwiki\StyleUtils;
use dokuwiki\Menu\Item\AbstractItem;
use dokuwiki\Form\Form;
use dokuwiki\Menu\MobileMenu;
use dokuwiki\Ui\Subscribe;
use dokuwiki\Extension\AdminPlugin;
use dokuwiki\Extension\Event;
use dokuwiki\File\PageResolver;

/**
 * Access a template file
 *
 * Returns the path to the given file inside the current template, uses
 * default template if the custom version doesn't exist.
 *
 * @param string $file
 * @return string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function template($file)
{
    global $conf;

    if (@is_readable(DOKU_INC . 'lib/tpl/' . $conf['template'] . '/' . $file))
        return DOKU_INC . 'lib/tpl/' . $conf['template'] . '/' . $file;

    return DOKU_INC . 'lib/tpl/dokuwiki/' . $file;
}

/**
 * Convenience function to access template dir from local FS
 *
 * This replaces the deprecated DOKU_TPLINC constant
 *
 * @param string $tpl The template to use, default to current one
 * @return string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_incdir($tpl = '')
{
    global $conf;
    if (!$tpl) $tpl = $conf['template'];
    return DOKU_INC . 'lib/tpl/' . $tpl . '/';
}

/**
 * Convenience function to access template dir from web
 *
 * This replaces the deprecated DOKU_TPL constant
 *
 * @param string $tpl The template to use, default to current one
 * @return string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_basedir($tpl = '')
{
    global $conf;
    if (!$tpl) $tpl = $conf['template'];
    return DOKU_BASE . 'lib/tpl/' . $tpl . '/';
}

/**
 * Print the content
 *
 * This function is used for printing all the usual content
 * (defined by the global $ACT var) by calling the appropriate
 * outputfunction(s) from html.php
 *
 * Everything that doesn't use the main template file isn't
 * handled by this function. ACL stuff is not done here either.
 *
 * @param bool $prependTOC should the TOC be displayed here?
 * @return bool true if any output
 *
 * @triggers TPL_ACT_RENDER
 * @triggers TPL_CONTENT_DISPLAY
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_content($prependTOC = true)
{
    global $ACT;
    global $INFO;
    $INFO['prependTOC'] = $prependTOC;

    ob_start();
    Event::createAndTrigger('TPL_ACT_RENDER', $ACT, 'tpl_content_core');
    $html_output = ob_get_clean();
    Event::createAndTrigger('TPL_CONTENT_DISPLAY', $html_output, function ($html_output) {
        echo $html_output;
    });

    return !empty($html_output);
}

/**
 * Default Action of TPL_ACT_RENDER
 *
 * @return bool
 */
function tpl_content_core()
{
    $router = ActionRouter::getInstance();
    try {
        $router->getAction()->tplContent();
    } catch (FatalException $e) {
        // there was no content for the action
        msg(hsc($e->getMessage()), -1);
        return false;
    }
    return true;
}

/**
 * Places the TOC where the function is called
 *
 * If you use this you most probably want to call tpl_content with
 * a false argument
 *
 * @param bool $return Should the TOC be returned instead to be printed?
 * @return string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_toc($return = false)
{
    global $TOC;
    global $ACT;
    global $ID;
    global $REV;
    global $INFO;
    global $conf;
    $toc = [];

    if (is_array($TOC)) {
        // if a TOC was prepared in global scope, always use it
        $toc = $TOC;
    } elseif (($ACT == 'show' || str_starts_with($ACT, 'export')) && !$REV && $INFO['exists']) {
        // get TOC from metadata, render if neccessary
        $meta = p_get_metadata($ID, '', METADATA_RENDER_USING_CACHE);
        $tocok = $meta['internal']['toc'] ?? true;
        $toc = $meta['description']['tableofcontents'] ?? null;
        if (!$tocok || !is_array($toc) || !$conf['tocminheads'] || count($toc) < $conf['tocminheads']) {
            $toc = [];
        }
    } elseif ($ACT == 'admin') {
        // try to load admin plugin TOC
        /** @var AdminPlugin $plugin */
        if ($plugin = plugin_getRequestAdminPlugin()) {
            $toc = $plugin->getTOC();
            $TOC = $toc; // avoid later rebuild
        }
    }

    Event::createAndTrigger('TPL_TOC_RENDER', $toc, null, false);
    $html = html_TOC($toc);
    if ($return) return $html;
    echo $html;
    return '';
}

/**
 * Handle the admin page contents
 *
 * @return bool
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_admin()
{
    global $INFO;
    global $TOC;
    global $INPUT;

    $plugin = null;
    $class = $INPUT->str('page');
    if (!empty($class)) {
        $pluginlist = plugin_list('admin');

        if (in_array($class, $pluginlist)) {
            // attempt to load the plugin
            /** @var AdminPlugin $plugin */
            $plugin = plugin_load('admin', $class);
        }
    }

    if ($plugin instanceof PluginInterface) {
        if (!is_array($TOC)) $TOC = $plugin->getTOC(); //if TOC wasn't requested yet
        if ($INFO['prependTOC']) tpl_toc();
        $plugin->html();
    } else {
        $admin = new Admin();
        $admin->show();
    }
    return true;
}

/**
 * Print the correct HTML meta headers
 *
 * This has to go into the head section of your template.
 *
 * @param bool $alt Should feeds and alternative format links be added?
 * @return bool
 * @throws JsonException
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 * @triggers TPL_METAHEADER_OUTPUT
 */
function tpl_metaheaders($alt = true)
{
    global $ID;
    global $REV;
    global $INFO;
    global $JSINFO;
    global $ACT;
    global $QUERY;
    global $lang;
    global $conf;
    global $updateVersion;
    /** @var Input $INPUT */
    global $INPUT;

    // prepare the head array
    $head = [];

    // prepare seed for js and css
    $tseed = $updateVersion;
    $depends = getConfigFiles('main');
    $depends[] = DOKU_CONF . "tpl/" . $conf['template'] . "/style.ini";
    foreach ($depends as $f) $tseed .= @filemtime($f);
    $tseed = md5($tseed);

    // the usual stuff
    $head['meta'][] = ['name' => 'generator', 'content' => 'DokuWiki'];
    if (actionOK('search')) {
        $head['link'][] = [
            'rel' => 'search',
            'type' => 'application/opensearchdescription+xml',
            'href' => DOKU_BASE . 'lib/exe/opensearch.php',
            'title' => $conf['title']
        ];
    }

    $head['link'][] = ['rel' => 'start', 'href' => DOKU_BASE];
    if (actionOK('index')) {
        $head['link'][] = [
            'rel' => 'contents',
            'href' => wl($ID, 'do=index', false, '&'),
            'title' => $lang['btn_index']
        ];
    }

    if (actionOK('manifest')) {
        $head['link'][] = [
            'rel' => 'manifest',
            'href' => DOKU_BASE . 'lib/exe/manifest.php'
        ];
    }

    $styleUtil = new StyleUtils();
    $styleIni = $styleUtil->cssStyleini();
    $replacements = $styleIni['replacements'];
    if (!empty($replacements['__theme_color__'])) {
        $head['meta'][] = [
            'name' => 'theme-color',
            'content' => $replacements['__theme_color__']
        ];
    }

    if ($alt) {
        if (actionOK('rss')) {
            $head['link'][] = [
                'rel' => 'alternate',
                'type' => 'application/rss+xml',
                'title' => $lang['btn_recent'],
                'href' => DOKU_BASE . 'feed.php'
            ];
            $head['link'][] = [
                'rel' => 'alternate',
                'type' => 'application/rss+xml',
                'title' => $lang['currentns'],
                'href' => DOKU_BASE . 'feed.php?mode=list&ns=' . (isset($INFO) ? $INFO['namespace'] : '')
            ];
        }
        if (($ACT == 'show' || $ACT == 'search') && $INFO['writable']) {
            $head['link'][] = [
                'rel' => 'edit',
                'title' => $lang['btn_edit'],
                'href' => wl($ID, 'do=edit', false, '&')
            ];
        }

        if (actionOK('rss') && $ACT == 'search') {
            $head['link'][] = [
                'rel' => 'alternate',
                'type' => 'application/rss+xml',
                'title' => $lang['searchresult'],
                'href' => DOKU_BASE . 'feed.php?mode=search&q=' . $QUERY
            ];
        }

        if (actionOK('export_xhtml')) {
            $head['link'][] = [
                'rel' => 'alternate',
                'type' => 'text/html',
                'title' => $lang['plainhtml'],
                'href' => exportlink($ID, 'xhtml', '', false, '&')
            ];
        }

        if (actionOK('export_raw')) {
            $head['link'][] = [
                'rel' => 'alternate',
                'type' => 'text/plain',
                'title' => $lang['wikimarkup'],
                'href' => exportlink($ID, 'raw', '', false, '&')
            ];
        }
    }

    // setup robot tags appropriate for different modes
    if (($ACT == 'show' || $ACT == 'export_xhtml') && !$REV) {
        if ($INFO['exists']) {
            //delay indexing:
            if ((time() - $INFO['lastmod']) >= $conf['indexdelay'] && !isHiddenPage($ID)) {
                $head['meta'][] = ['name' => 'robots', 'content' => 'index,follow'];
            } else {
                $head['meta'][] = ['name' => 'robots', 'content' => 'noindex,nofollow'];
            }
            $canonicalUrl = wl($ID, '', true, '&');
            if ($ID == $conf['start']) {
                $canonicalUrl = DOKU_URL;
            }
            $head['link'][] = ['rel' => 'canonical', 'href' => $canonicalUrl];
        } else {
            $head['meta'][] = ['name' => 'robots', 'content' => 'noindex,follow'];
        }
    } elseif (defined('DOKU_MEDIADETAIL')) {
        $head['meta'][] = ['name' => 'robots', 'content' => 'index,follow'];
    } else {
        $head['meta'][] = ['name' => 'robots', 'content' => 'noindex,nofollow'];
    }

    // set metadata
    if ($ACT == 'show' || $ACT == 'export_xhtml') {
        // keywords (explicit or implicit)
        if (!empty($INFO['meta']['subject'])) {
            $head['meta'][] = ['name' => 'keywords', 'content' => implode(',', $INFO['meta']['subject'])];
        } else {
            $head['meta'][] = ['name' => 'keywords', 'content' => str_replace(':', ',', $ID)];
        }
    }

    // load stylesheets
    $head['link'][] = [
        'rel' => 'stylesheet',
        'href' => DOKU_BASE . 'lib/exe/css.php?t=' . rawurlencode($conf['template']) . '&tseed=' . $tseed
    ];

    $script = "var NS='" . (isset($INFO) ? $INFO['namespace'] : '') . "';";
    if ($conf['useacl'] && $INPUT->server->str('REMOTE_USER')) {
        $script .= "var SIG=" . toolbar_signature() . ";";
    }
    jsinfo();
    $script .= 'var JSINFO = ' . json_encode($JSINFO, JSON_THROW_ON_ERROR) . ';';
    $script .= '(function(H){H.className=H.className.replace(/\bno-js\b/,\'js\')})(document.documentElement);';
    $head['script'][] = ['_data' => $script];

    // load jquery
    $jquery = getCdnUrls();
    foreach ($jquery as $src) {
        $head['script'][] = [
                '_data' => '',
                'src' => $src
            ] + ($conf['defer_js'] ? ['defer' => 'defer'] : []);
    }

    // load our javascript dispatcher
    $head['script'][] = [
            '_data' => '',
            'src' => DOKU_BASE . 'lib/exe/js.php' . '?t=' . rawurlencode($conf['template']) . '&tseed=' . $tseed
        ] + ($conf['defer_js'] ? ['defer' => 'defer'] : []);

    // trigger event here
    Event::createAndTrigger('TPL_METAHEADER_OUTPUT', $head, '_tpl_metaheaders_action', true);
    return true;
}

/**
 * prints the array build by tpl_metaheaders
 *
 * $data is an array of different header tags. Each tag can have multiple
 * instances. Attributes are given as key value pairs. Values will be HTML
 * encoded automatically so they should be provided as is in the $data array.
 *
 * For tags having a body attribute specify the body data in the special
 * attribute '_data'. This field will NOT BE ESCAPED automatically.
 *
 * Inline scripts will use any nonce provided in the environment variable 'NONCE'.
 *
 * @param array $data
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function _tpl_metaheaders_action($data)
{
    $nonce = getenv('NONCE');
    foreach ($data as $tag => $inst) {
        foreach ($inst as $attr) {
            if (empty($attr)) {
                continue;
            }
            if ($nonce && $tag == 'script' && !empty($attr['_data'])) {
                $attr['nonce'] = $nonce; // add nonce to inline script tags
            }
            echo '<', $tag, ' ', buildAttributes($attr);
            if (isset($attr['_data']) || $tag == 'script') {
                echo '>', $attr['_data'] ?? '', '</', $tag, '>';
            } else {
                echo '/>';
            }
            echo "\n";
        }
    }
}

/**
 * Output the given script as inline script tag
 *
 * This function will add the nonce attribute if a nonce is available.
 *
 * The script is NOT automatically escaped!
 *
 * @param string $script
 * @param bool $return Return or print directly?
 * @return string|void
 */
function tpl_inlineScript($script, $return = false)
{
    $nonce = getenv('NONCE');
    if ($nonce) {
        $script = '<script nonce="' . $nonce . '">' . $script . '</script>';
    } else {
        $script = '<script>' . $script . '</script>';
    }

    if ($return) return $script;
    echo $script;
}

/**
 * Print a link
 *
 * Just builds a link.
 *
 * @param string $url
 * @param string $name
 * @param string $more
 * @param bool $return if true return the link html, otherwise print
 * @return bool|string html of the link, or true if printed
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_link($url, $name, $more = '', $return = false)
{
    $out = '<a href="' . $url . '" ';
    if ($more) $out .= ' ' . $more;
    $out .= ">$name</a>";
    if ($return) return $out;
    echo $out;
    return true;
}

/**
 * Prints a link to a WikiPage
 *
 * Wrapper around html_wikilink
 *
 * @param string $id page id
 * @param string|null $name the name of the link
 * @param bool $return
 * @return true|string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_pagelink($id, $name = null, $return = false)
{
    $out = '<bdi>' . html_wikilink($id, $name) . '</bdi>';
    if ($return) return $out;
    echo $out;
    return true;
}

/**
 * get the parent page
 *
 * Tries to find out which page is parent.
 * returns false if none is available
 *
 * @param string $id page id
 * @return false|string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_getparent($id)
{
    $resolver = new PageResolver('root');

    $parent = getNS($id) . ':';
    $parent = $resolver->resolveId($parent);
    if ($parent == $id) {
        $pos = strrpos(getNS($id), ':');
        $parent = substr($parent, 0, $pos) . ':';
        $parent = $resolver->resolveId($parent);
        if ($parent == $id) return false;
    }
    return $parent;
}

/**
 * Print one of the buttons
 *
 * @param string $type
 * @param bool $return
 * @return bool|string html, or false if no data, true if printed
 * @see    tpl_get_action
 *
 * @author Adrian Lang <mail@adrianlang.de>
 * @deprecated 2017-09-01 see devel:menus
 */
function tpl_button($type, $return = false)
{
    dbg_deprecated('see devel:menus');
    $data = tpl_get_action($type);
    if ($data === false) {
        return false;
    } elseif (!is_array($data)) {
        $out = sprintf($data, 'button');
    } else {
        /**
         * @var string $accesskey
         * @var string $id
         * @var string $method
         * @var array $params
         */
        extract($data);
        if ($id === '#dokuwiki__top') {
            $out = html_topbtn();
        } else {
            $out = html_btn($type, $id, $accesskey, $params, $method);
        }
    }
    if ($return) return $out;
    echo $out;
    return true;
}

/**
 * Like the action buttons but links
 *
 * @param string $type action command
 * @param string $pre prefix of link
 * @param string $suf suffix of link
 * @param string $inner innerHML of link
 * @param bool $return if true it returns html, otherwise prints
 * @return bool|string html or false if no data, true if printed
 *
 * @see    tpl_get_action
 * @author Adrian Lang <mail@adrianlang.de>
 * @deprecated 2017-09-01 see devel:menus
 */
function tpl_actionlink($type, $pre = '', $suf = '', $inner = '', $return = false)
{
    dbg_deprecated('see devel:menus');
    global $lang;
    $data = tpl_get_action($type);
    if ($data === false) {
        return false;
    } elseif (!is_array($data)) {
        $out = sprintf($data, 'link');
    } else {
        /**
         * @var string $accesskey
         * @var string $id
         * @var string $method
         * @var bool $nofollow
         * @var array $params
         * @var string $replacement
         */
        extract($data);
        if (strpos($id, '#') === 0) {
            $linktarget = $id;
        } else {
            $linktarget = wl($id, $params);
        }
        $caption = $lang['btn_' . $type];
        if (strpos($caption, '%s')) {
            $caption = sprintf($caption, $replacement);
        }
        $akey = '';
        $addTitle = '';
        if ($accesskey) {
            $akey = 'accesskey="' . $accesskey . '" ';
            $addTitle = ' [' . strtoupper($accesskey) . ']';
        }
        $rel = $nofollow ? 'rel="nofollow" ' : '';
        $out = tpl_link(
            $linktarget,
            $pre . ($inner ?: $caption) . $suf,
            'class="action ' . $type . '" ' .
            $akey . $rel .
            'title="' . hsc($caption) . $addTitle . '"',
            true
        );
    }
    if ($return) return $out;
    echo $out;
    return true;
}

/**
 * Check the actions and get data for buttons and links
 *
 * @param string $type
 * @return array|bool|string
 *
 * @author Adrian Lang <mail@adrianlang.de>
 * @author Andreas Gohr <andi@splitbrain.org>
 * @author Matthias Grimm <matthiasgrimm@users.sourceforge.net>
 * @deprecated 2017-09-01 see devel:menus
 */
function tpl_get_action($type)
{
    dbg_deprecated('see devel:menus');
    if ($type == 'history') $type = 'revisions';
    if ($type == 'subscription') $type = 'subscribe';
    if ($type == 'img_backto') $type = 'imgBackto';

    $class = '\\dokuwiki\\Menu\\Item\\' . ucfirst($type);
    if (class_exists($class)) {
        try {
            /** @var AbstractItem $item */
            $item = new $class();
            $data = $item->getLegacyData();
            $unknown = false;
        } catch (RuntimeException $ignored) {
            return false;
        }
    } else {
        global $ID;
        $data = [
            'accesskey' => null,
            'type' => $type,
            'id' => $ID,
            'method' => 'get',
            'params' => ['do' => $type],
            'nofollow' => true,
            'replacement' => ''
        ];
        $unknown = true;
    }

    $evt = new Event('TPL_ACTION_GET', $data);
    if ($evt->advise_before()) {
        //handle unknown types
        if ($unknown) {
            $data = '[unknown %s type]';
        }
    }
    $evt->advise_after();
    unset($evt);

    return $data;
}

/**
 * Wrapper around tpl_button() and tpl_actionlink()
 *
 * @param string $type action command
 * @param bool $link link or form button?
 * @param string|bool $wrapper HTML element wrapper
 * @param bool $return return or print
 * @param string $pre prefix for links
 * @param string $suf suffix for links
 * @param string $inner inner HTML for links
 * @return bool|string
 *
 * @author Anika Henke <anika@selfthinker.org>
 * @deprecated 2017-09-01 see devel:menus
 */
function tpl_action($type, $link = false, $wrapper = false, $return = false, $pre = '', $suf = '', $inner = '')
{
    dbg_deprecated('see devel:menus');
    $out = '';
    if ($link) {
        $out .= tpl_actionlink($type, $pre, $suf, $inner, true);
    } else {
        $out .= tpl_button($type, true);
    }
    if ($out && $wrapper) $out = "<$wrapper>$out</$wrapper>";

    if ($return) return $out;
    echo $out;
    return (bool)$out;
}

/**
 * Print the search form
 *
 * If the first parameter is given a div with the ID 'qsearch_out' will
 * be added which instructs the ajax pagequicksearch to kick in and place
 * its output into this div. The second parameter controls the propritary
 * attribute autocomplete. If set to false this attribute will be set with an
 * value of "off" to instruct the browser to disable it's own built in
 * autocompletion feature (MSIE and Firefox)
 *
 * @param bool $ajax
 * @param bool $autocomplete
 * @return bool
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_searchform($ajax = true, $autocomplete = true)
{
    global $lang;
    global $ACT;
    global $QUERY;
    global $ID;

    // don't print the search form if search action has been disabled
    if (!actionOK('search')) return false;

    $searchForm = new Form([
        'action' => wl(),
        'method' => 'get',
        'role' => 'search',
        'class' => 'search',
        'id' => 'dw__search',
    ], true);
    $searchForm->addTagOpen('div')->addClass('no');
    $searchForm->setHiddenField('do', 'search');
    $searchForm->setHiddenField('id', $ID);
    $searchForm->addTextInput('q')
        ->addClass('edit')
        ->attrs([
            'title' => '[F]',
            'accesskey' => 'f',
            'placeholder' => $lang['btn_search'],
            'autocomplete' => $autocomplete ? 'on' : 'off',
        ])
        ->id('qsearch__in')
        ->val($ACT === 'search' ? $QUERY : '')
        ->useInput(false);
    $searchForm->addButton('', $lang['btn_search'])->attrs([
        'type' => 'submit',
        'title' => $lang['btn_search'],
    ]);
    if ($ajax) {
        $searchForm->addTagOpen('div')->id('qsearch__out')->addClass('ajax_qsearch JSpopup');
        $searchForm->addTagClose('div');
    }
    $searchForm->addTagClose('div');

    echo $searchForm->toHTML('QuickSearch');

    return true;
}

/**
 * Print the breadcrumbs trace
 *
 * @param string $sep Separator between entries
 * @param bool $return return or print
 * @return bool|string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_breadcrumbs($sep = null, $return = false)
{
    global $lang;
    global $conf;

    //check if enabled
    if (!$conf['breadcrumbs']) return false;

    //set default
    if (is_null($sep)) $sep = '•';

    $out = '';

    $crumbs = breadcrumbs(); //setup crumb trace

    $crumbs_sep = ' <span class="bcsep">' . $sep . '</span> ';

    //render crumbs, highlight the last one
    $out .= '<span class="bchead">' . $lang['breadcrumb'] . '</span>';
    $last = count($crumbs);
    $i = 0;
    foreach ($crumbs as $id => $name) {
        $i++;
        $out .= $crumbs_sep;
        if ($i == $last) $out .= '<span class="curid">';
        $out .= '<bdi>' . tpl_link(wl($id), hsc($name), 'class="breadcrumbs" title="' . $id . '"', true) . '</bdi>';
        if ($i == $last) $out .= '</span>';
    }
    if ($return) return $out;
    echo $out;
    return (bool)$out;
}

/**
 * Hierarchical breadcrumbs
 *
 * This code was suggested as replacement for the usual breadcrumbs.
 * It only makes sense with a deep site structure.
 *
 * @param string $sep Separator between entries
 * @param bool $return return or print
 * @return bool|string
 *
 * @todo   May behave strangely in RTL languages
 * @author <fredrik@averpil.com>
 * @author Andreas Gohr <andi@splitbrain.org>
 * @author Nigel McNie <oracle.shinoda@gmail.com>
 * @author Sean Coates <sean@caedmon.net>
 */
function tpl_youarehere($sep = null, $return = false)
{
    global $conf;
    global $ID;
    global $lang;

    // check if enabled
    if (!$conf['youarehere']) return false;

    //set default
    if (is_null($sep)) $sep = ' » ';

    $out = '';

    $parts = explode(':', $ID);
    $count = count($parts);

    $out .= '<span class="bchead">' . $lang['youarehere'] . ' </span>';

    // always print the startpage
    $out .= '<span class="home">' . tpl_pagelink(':' . $conf['start'], null, true) . '</span>';

    // print intermediate namespace links
    $part = '';
    for ($i = 0; $i < $count - 1; $i++) {
        $part .= $parts[$i] . ':';
        $page = $part;
        if ($page == $conf['start']) continue; // Skip startpage

        // output
        $out .= $sep . tpl_pagelink($page, null, true);
    }

    // print current page, skipping start page, skipping for namespace index
    if (isset($page)) {
        $page = (new PageResolver('root'))->resolveId($page);
        if ($page == $part . $parts[$i]) {
            if ($return) return $out;
            echo $out;
            return true;
        }
    }
    $page = $part . $parts[$i];
    if ($page == $conf['start']) {
        if ($return) return $out;
        echo $out;
        return true;
    }
    $out .= $sep;
    $out .= tpl_pagelink($page, null, true);
    if ($return) return $out;
    echo $out;
    return (bool)$out;
}

/**
 * Print info if the user is logged in
 * and show full name in that case
 *
 * Could be enhanced with a profile link in future?
 *
 * @return bool
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_userinfo()
{
    global $lang;
    /** @var Input $INPUT */
    global $INPUT;

    if ($INPUT->server->str('REMOTE_USER')) {
        echo $lang['loggedinas'] . ' ' . userlink();
        return true;
    }
    return false;
}

/**
 * Print some info about the current page
 *
 * @param bool $ret return content instead of printing it
 * @return bool|string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_pageinfo($ret = false)
{
    global $conf;
    global $lang;
    global $INFO;
    global $ID;

    // return if we are not allowed to view the page
    if (!auth_quickaclcheck($ID)) {
        return false;
    }

    // prepare date and path
    $fn = $INFO['filepath'];
    if (!$conf['fullpath']) {
        if ($INFO['rev']) {
            $fn = str_replace($conf['olddir'] . '/', '', $fn);
        } else {
            $fn = str_replace($conf['datadir'] . '/', '', $fn);
        }
    }
    $fn = utf8_decodeFN($fn);
    $dateLocal = dformat($INFO['lastmod']);
    $dateIso = date(DATE_ISO8601, $INFO['lastmod']);

    // print it
    if ($INFO['exists']) {
        $out = '<bdi>' . $fn . '</bdi>';
        $out .= ' · ';
        $out .= $lang['lastmod'];
        $out .= ' ';
        $out .= '<time datetime="' . $dateIso . '">' . $dateLocal . '</time>';
        if ($INFO['editor']) {
            $out .= ' ' . $lang['by'] . ' ';
            $out .= '<bdi>' . editorinfo($INFO['editor']) . '</bdi>';
        } else {
            $out .= ' (' . $lang['external_edit'] . ')';
        }
        if ($INFO['locked']) {
            $out .= ' · ';
            $out .= $lang['lockedby'];
            $out .= ' ';
            $out .= '<bdi>' . editorinfo($INFO['locked']) . '</bdi>';
        }
        if ($ret) {
            return $out;
        } else {
            echo $out;
            return true;
        }
    }
    return false;
}

/**
 * Prints or returns the name of the given page (current one if none given).
 *
 * If useheading is enabled this will use the first headline else
 * the given ID is used.
 *
 * @param string $id page id
 * @param bool $ret return content instead of printing
 * @return bool|string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_pagetitle($id = null, $ret = false)
{
    global $ACT, $conf, $lang;

    if (is_null($id)) {
        global $ID;
        $id = $ID;
    }

    $name = $id;
    if (useHeading('navigation')) {
        $first_heading = p_get_first_heading($id);
        if ($first_heading) $name = $first_heading;
    }

    // default page title is the page name, modify with the current action
    switch ($ACT) {
        // admin functions
        case 'admin':
            $page_title = $lang['btn_admin'];
            // try to get the plugin name
            /** @var AdminPlugin $plugin */
            if ($plugin = plugin_getRequestAdminPlugin()) {
                $plugin_title = $plugin->getMenuText($conf['lang']);
                $page_title = $plugin_title ?: $plugin->getPluginName();
            }
            break;

        // show action as title
        case 'login':
        case 'profile':
        case 'register':
        case 'resendpwd':
        case 'index':
        case 'search':
            $page_title = $lang['btn_' . $ACT];
            break;

        // add pen during editing
        case 'edit':
        case 'preview':
            $page_title = "✎ " . $name;
            break;

        // add action to page name
        case 'revisions':
            $page_title = $name . ' - ' . $lang['btn_revs'];
            break;

        // add action to page name
        case 'backlink':
        case 'recent':
        case 'subscribe':
            $page_title = $name . ' - ' . $lang['btn_' . $ACT];
            break;

        default: // SHOW and anything else not included
            $page_title = $name;
    }

    if ($ret) {
        return hsc($page_title);
    } else {
        echo hsc($page_title);
        return true;
    }
}

/**
 * Returns the requested EXIF/IPTC tag from the current image
 *
 * If $tags is an array all given tags are tried until a
 * value is found. If no value is found $alt is returned.
 *
 * Which texts are known is defined in the functions _exifTagNames
 * and _iptcTagNames() in inc/jpeg.php (You need to prepend IPTC
 * to the names of the latter one)
 *
 * Only allowed in: detail.php
 *
 * @param array|string $tags tag or array of tags to try
 * @param string $alt alternative output if no data was found
 * @param null|string $src the image src, uses global $SRC if not given
 * @return string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_img_getTag($tags, $alt = '', $src = null)
{
    // Init Exif Reader
    global $SRC, $imgMeta;

    if (is_null($src)) $src = $SRC;
    if (is_null($src)) return $alt;

    if (!isset($imgMeta)) {
        $imgMeta = new JpegMeta($src);
    }
    if ($imgMeta === false) return $alt;
    $info = cleanText($imgMeta->getField($tags));
    if (!$info) return $alt;
    return $info;
}


/**
 * Garbage collects up the open JpegMeta object.
 */
function tpl_img_close()
{
    global $imgMeta;
    $imgMeta = null;
}

/**
 * Prints a html description list of the metatags of the current image
 */
function tpl_img_meta()
{
    global $lang;

    $tags = tpl_get_img_meta();

    echo '<dl>';
    foreach ($tags as $tag) {
        $label = $lang[$tag['langkey']];
        if (!$label) $label = $tag['langkey'] . ':';

        echo '<dt>' . $label . '</dt><dd>';
        if ($tag['type'] == 'date') {
            echo dformat($tag['value']);
        } else {
            echo hsc($tag['value']);
        }
        echo '</dd>';
    }
    echo '</dl>';
}

/**
 * Returns metadata as configured in mediameta config file, ready for creating html
 *
 * @return array with arrays containing the entries:
 *   - string langkey  key to lookup in the $lang var, if not found printed as is
 *   - string type     type of value
 *   - string value    tag value (unescaped)
 */
function tpl_get_img_meta()
{

    $config_files = getConfigFiles('mediameta');
    foreach ($config_files as $config_file) {
        if (file_exists($config_file)) {
            include($config_file);
        }
    }
    $tags = [];
    foreach ($fields as $tag) {
        $t = [];
        if (!empty($tag[0])) {
            $t = [$tag[0]];
        }
        if (isset($tag[3]) && is_array($tag[3])) {
            $t = array_merge($t, $tag[3]);
        }
        $value = tpl_img_getTag($t);
        if ($value) {
            $tags[] = ['langkey' => $tag[1], 'type' => $tag[2], 'value' => $value];
        }
    }
    return $tags;
}

/**
 * Prints the image with a link to the full sized version
 *
 * Only allowed in: detail.php
 *
 * @triggers TPL_IMG_DISPLAY
 * @param int $maxwidth - maximal width of the image
 * @param int $maxheight - maximal height of the image
 * @param bool $link - link to the orginal size?
 * @param array $params - additional image attributes
 * @return bool Result of TPL_IMG_DISPLAY
 */
function tpl_img($maxwidth = 0, $maxheight = 0, $link = true, $params = null)
{
    global $IMG;
    /** @var Input $INPUT */
    global $INPUT;
    global $REV;
    $w = (int)tpl_img_getTag('File.Width');
    $h = (int)tpl_img_getTag('File.Height');

    //resize to given max values
    $ratio = 1;
    if ($w >= $h) {
        if ($maxwidth && $w >= $maxwidth) {
            $ratio = $maxwidth / $w;
        } elseif ($maxheight && $h > $maxheight) {
            $ratio = $maxheight / $h;
        }
    } elseif ($maxheight && $h >= $maxheight) {
        $ratio = $maxheight / $h;
    } elseif ($maxwidth && $w > $maxwidth) {
        $ratio = $maxwidth / $w;
    }
    if ($ratio) {
        $w = floor($ratio * $w);
        $h = floor($ratio * $h);
    }

    //prepare URLs
    $url = ml($IMG, ['cache' => $INPUT->str('cache'), 'rev' => $REV], true, '&');
    $src = ml($IMG, ['cache' => $INPUT->str('cache'), 'rev' => $REV, 'w' => $w, 'h' => $h], true, '&');

    //prepare attributes
    $alt = tpl_img_getTag('Simple.Title');
    if (is_null($params)) {
        $p = [];
    } else {
        $p = $params;
    }
    if ($w) $p['width'] = $w;
    if ($h) $p['height'] = $h;
    $p['class'] = 'img_detail';
    if ($alt) {
        $p['alt'] = $alt;
        $p['title'] = $alt;
    } else {
        $p['alt'] = '';
    }
    $p['src'] = $src;

    $data = ['url' => ($link ? $url : null), 'params' => $p];
    return Event::createAndTrigger('TPL_IMG_DISPLAY', $data, '_tpl_img_action', true);
}

/**
 * Default action for TPL_IMG_DISPLAY
 *
 * @param array $data
 * @return bool
 */
function _tpl_img_action($data)
{
    global $lang;
    $p = buildAttributes($data['params']);

    if ($data['url']) echo '<a href="' . hsc($data['url']) . '" title="' . $lang['mediaview'] . '">';
    echo '<img ' . $p . '/>';
    if ($data['url']) echo '</a>';
    return true;
}

/**
 * This function inserts a small gif which in reality is the indexer function.
 *
 * Should be called somewhere at the very end of the main.php template
 *
 * @return bool
 */
function tpl_indexerWebBug()
{
    global $ID;

    $p = [];
    $p['src'] = DOKU_BASE . 'lib/exe/taskrunner.php?id=' . rawurlencode($ID) .
        '&' . time();
    $p['width'] = 2; //no more 1x1 px image because we live in times of ad blockers...
    $p['height'] = 1;
    $p['alt'] = '';
    $att = buildAttributes($p);
    echo "<img $att />";
    return true;
}

/**
 * tpl_getConf($id)
 *
 * use this function to access template configuration variables
 *
 * @param string $id name of the value to access
 * @param mixed $notset what to return if the setting is not available
 * @return mixed
 */
function tpl_getConf($id, $notset = false)
{
    global $conf;
    static $tpl_configloaded = false;

    $tpl = $conf['template'];

    if (!$tpl_configloaded) {
        $tconf = tpl_loadConfig();
        if ($tconf !== false) {
            foreach ($tconf as $key => $value) {
                if (isset($conf['tpl'][$tpl][$key])) continue;
                $conf['tpl'][$tpl][$key] = $value;
            }
            $tpl_configloaded = true;
        }
    }

    return $conf['tpl'][$tpl][$id] ?? $notset;
}

/**
 * tpl_loadConfig()
 *
 * reads all template configuration variables
 * this function is automatically called by tpl_getConf()
 *
 * @return false|array
 */
function tpl_loadConfig()
{

    $file = tpl_incdir() . '/conf/default.php';
    $conf = [];

    if (!file_exists($file)) return false;

    // load default config file
    include($file);

    return $conf;
}

// language methods

/**
 * tpl_getLang($id)
 *
 * use this function to access template language variables
 *
 * @param string $id key of language string
 * @return string
 */
function tpl_getLang($id)
{
    static $lang = [];

    if (count($lang) === 0) {
        global $conf, $config_cascade; // definitely don't invoke "global $lang"

        $path = tpl_incdir() . 'lang/';

        $lang = [];

        // don't include once
        @include($path . 'en/lang.php');
        foreach ($config_cascade['lang']['template'] as $config_file) {
            if (file_exists($config_file . $conf['template'] . '/en/lang.php')) {
                include($config_file . $conf['template'] . '/en/lang.php');
            }
        }

        if ($conf['lang'] != 'en') {
            @include($path . $conf['lang'] . '/lang.php');
            foreach ($config_cascade['lang']['template'] as $config_file) {
                if (file_exists($config_file . $conf['template'] . '/' . $conf['lang'] . '/lang.php')) {
                    include($config_file . $conf['template'] . '/' . $conf['lang'] . '/lang.php');
                }
            }
        }
    }
    return $lang[$id] ?? '';
}

/**
 * Retrieve a language dependent file and pass to xhtml renderer for display
 * template equivalent of p_locale_xhtml()
 *
 * @param string $id id of language dependent wiki page
 * @return  string     parsed contents of the wiki page in xhtml format
 */
function tpl_locale_xhtml($id)
{
    return p_cached_output(tpl_localeFN($id));
}

/**
 * Prepends appropriate path for a language dependent filename
 *
 * @param string $id id of localized text
 * @return string wiki text
 */
function tpl_localeFN($id)
{
    $path = tpl_incdir() . 'lang/';
    global $conf;
    $file = DOKU_CONF . 'template_lang/' . $conf['template'] . '/' . $conf['lang'] . '/' . $id . '.txt';
    if (!file_exists($file)) {
        $file = $path . $conf['lang'] . '/' . $id . '.txt';
        if (!file_exists($file)) {
            //fall back to english
            $file = $path . 'en/' . $id . '.txt';
        }
    }
    return $file;
}

/**
 * prints the "main content" in the mediamanager popup
 *
 * Depending on the user's actions this may be a list of
 * files in a namespace, the meta editing dialog or
 * a message of referencing pages
 *
 * Only allowed in mediamanager.php
 *
 * @triggers MEDIAMANAGER_CONTENT_OUTPUT
 * @param bool $fromajax - set true when calling this function via ajax
 * @param string $sort
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_mediaContent($fromajax = false, $sort = 'natural')
{
    global $IMG;
    global $AUTH;
    global $INUSE;
    global $NS;
    global $JUMPTO;
    /** @var Input $INPUT */
    global $INPUT;

    $do = $INPUT->extract('do')->str('do');
    if (in_array($do, ['save', 'cancel'])) $do = '';

    if (!$do) {
        if ($INPUT->bool('edit')) {
            $do = 'metaform';
        } elseif (is_array($INUSE)) {
            $do = 'filesinuse';
        } else {
            $do = 'filelist';
        }
    }

    // output the content pane, wrapped in an event.
    if (!$fromajax) echo '<div id="media__content">';
    $data = ['do' => $do];
    $evt = new Event('MEDIAMANAGER_CONTENT_OUTPUT', $data);
    if ($evt->advise_before()) {
        $do = $data['do'];
        if ($do == 'filesinuse') {
            media_filesinuse($INUSE, $IMG);
        } elseif ($do == 'filelist') {
            media_filelist($NS, $AUTH, $JUMPTO, false, $sort);
        } elseif ($do == 'searchlist') {
            media_searchlist($INPUT->str('q'), $NS, $AUTH);
        } else {
            msg('Unknown action ' . hsc($do), -1);
        }
    }
    $evt->advise_after();
    unset($evt);
    if (!$fromajax) echo '</div>';
}

/**
 * Prints the central column in full-screen media manager
 * Depending on the opened tab this may be a list of
 * files in a namespace, upload form or search form
 *
 * @author Kate Arzamastseva <pshns@ukr.net>
 */
function tpl_mediaFileList()
{
    global $AUTH;
    global $NS;
    global $JUMPTO;
    global $lang;
    /** @var Input $INPUT */
    global $INPUT;

    $opened_tab = $INPUT->str('tab_files');
    if (!$opened_tab || !in_array($opened_tab, ['files', 'upload', 'search'])) $opened_tab = 'files';
    if ($INPUT->str('mediado') == 'update') $opened_tab = 'upload';

    echo '<h2 class="a11y">' . $lang['mediaselect'] . '</h2>' . NL;

    media_tabs_files($opened_tab);

    echo '<div class="panelHeader">' . NL;
    echo '<h3>';
    $tabTitle = $NS ?: '[' . $lang['mediaroot'] . ']';
    printf($lang['media_' . $opened_tab], '<strong>' . hsc($tabTitle) . '</strong>');
    echo '</h3>' . NL;
    if ($opened_tab === 'search' || $opened_tab === 'files') {
        media_tab_files_options();
    }
    echo '</div>' . NL;

    echo '<div class="panelContent">' . NL;
    if ($opened_tab == 'files') {
        media_tab_files($NS, $AUTH, $JUMPTO);
    } elseif ($opened_tab == 'upload') {
        media_tab_upload($NS, $AUTH, $JUMPTO);
    } elseif ($opened_tab == 'search') {
        media_tab_search($NS, $AUTH);
    }
    echo '</div>' . NL;
}

/**
 * Prints the third column in full-screen media manager
 * Depending on the opened tab this may be details of the
 * selected file, the meta editing dialog or
 * list of file revisions
 *
 * @param string $image
 * @param boolean $rev
 *
 * @author Kate Arzamastseva <pshns@ukr.net>
 */
function tpl_mediaFileDetails($image, $rev)
{
    global $conf, $DEL, $lang;
    /** @var Input $INPUT */
    global $INPUT;

    $removed = (
        !file_exists(mediaFN($image)) &&
        file_exists(mediaMetaFN($image, '.changes')) &&
        $conf['mediarevisions']
    );
    if (!$image || (!file_exists(mediaFN($image)) && !$removed) || $DEL) return;
    if ($rev && !file_exists(mediaFN($image, $rev))) $rev = false;
    $ns = getNS($image);
    $do = $INPUT->str('mediado');

    $opened_tab = $INPUT->str('tab_details');

    $tab_array = ['view'];
    [, $mime] = mimetype($image);
    if ($mime == 'image/jpeg') {
        $tab_array[] = 'edit';
    }
    if ($conf['mediarevisions']) {
        $tab_array[] = 'history';
    }

    if (!$opened_tab || !in_array($opened_tab, $tab_array)) $opened_tab = 'view';
    if ($INPUT->bool('edit')) $opened_tab = 'edit';
    if ($do == 'restore') $opened_tab = 'view';

    media_tabs_details($image, $opened_tab);

    echo '<div class="panelHeader"><h3>';
    [$ext] = mimetype($image, false);
    $class = preg_replace('/[^_\-a-z0-9]+/i', '_', $ext);
    $class = 'select mediafile mf_' . $class;

    $attributes = $rev ? ['rev' => $rev] : [];
    $tabTitle = sprintf(
        '<strong><a href="%s" class="%s" title="%s">%s</a></strong>',
        ml($image, $attributes),
        $class,
        $lang['mediaview'],
        $image
    );
    if ($opened_tab === 'view' && $rev) {
        printf($lang['media_viewold'], $tabTitle, dformat($rev));
    } else {
        printf($lang['media_' . $opened_tab], $tabTitle);
    }

    echo '</h3></div>' . NL;

    echo '<div class="panelContent">' . NL;

    if ($opened_tab == 'view') {
        media_tab_view($image, $ns, null, $rev);
    } elseif ($opened_tab == 'edit' && !$removed) {
        media_tab_edit($image, $ns);
    } elseif ($opened_tab == 'history' && $conf['mediarevisions']) {
        media_tab_history($image, $ns);
    }

    echo '</div>' . NL;
}

/**
 * prints the namespace tree in the mediamanager popup
 *
 * Only allowed in mediamanager.php
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_mediaTree()
{
    global $NS;
    echo '<div id="media__tree">';
    media_nstree($NS);
    echo '</div>';
}

/**
 * Print a dropdown menu with all DokuWiki actions
 *
 * Note: this will not use any pretty URLs
 *
 * @param string $empty empty option label
 * @param string $button submit button label
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 * @deprecated 2017-09-01 see devel:menus
 */
function tpl_actiondropdown($empty = '', $button = '&gt;')
{
    dbg_deprecated('see devel:menus');
    $menu = new MobileMenu();
    echo $menu->getDropdown($empty, $button);
}

/**
 * Print a informational line about the used license
 *
 * @param string $img print image? (|button|badge)
 * @param bool $imgonly skip the textual description?
 * @param bool $return when true don't print, but return HTML
 * @param bool $wrap wrap in div with class="license"?
 * @return string
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_license($img = 'badge', $imgonly = false, $return = false, $wrap = true)
{
    global $license;
    global $conf;
    global $lang;
    if (!$conf['license']) return '';
    if (!is_array($license[$conf['license']])) return '';
    $lic = $license[$conf['license']];
    $target = ($conf['target']['extern']) ? ' target="' . $conf['target']['extern'] . '"' : '';

    $out = '';
    if ($wrap) $out .= '<div class="license">';
    if ($img) {
        $src = license_img($img);
        if ($src) {
            $out .= '<a href="' . $lic['url'] . '" rel="license"' . $target;
            $out .= '><img src="' . DOKU_BASE . $src . '" alt="' . $lic['name'] . '" /></a>';
            if (!$imgonly) $out .= ' ';
        }
    }
    if (!$imgonly) {
        $out .= $lang['license'] . ' ';
        $out .= '<bdi><a href="' . $lic['url'] . '" rel="license" class="urlextern"' . $target;
        $out .= '>' . $lic['name'] . '</a></bdi>';
    }
    if ($wrap) $out .= '</div>';

    if ($return) return $out;
    echo $out;
    return '';
}

/**
 * Includes the rendered HTML of a given page
 *
 * This function is useful to populate sidebars or similar features in a
 * template
 *
 * @param string $pageid The page name you want to include
 * @param bool $print Should the content be printed or returned only
 * @param bool $propagate Search higher namespaces, too?
 * @param bool $useacl Include the page only if the ACLs check out?
 * @return bool|null|string
 */
function tpl_include_page($pageid, $print = true, $propagate = false, $useacl = true)
{
    if ($propagate) {
        $pageid = page_findnearest($pageid, $useacl);
    } elseif ($useacl && auth_quickaclcheck($pageid) == AUTH_NONE) {
        return false;
    }
    if (!$pageid) return false;

    global $TOC;
    $oldtoc = $TOC;
    $html = p_wiki_xhtml($pageid, '', false);
    $TOC = $oldtoc;

    if ($print) echo $html;
    return $html;
}

/**
 * Display the subscribe form
 *
 * @author Adrian Lang <lang@cosmocode.de>
 * @deprecated 2020-07-23
 */
function tpl_subscribe()
{
    dbg_deprecated(Subscribe::class . '::show()');
    (new Subscribe())->show();
}

/**
 * Tries to send already created content right to the browser
 *
 * Wraps around ob_flush() and flush()
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function tpl_flush()
{
    if (ob_get_level() > 0) ob_flush();
    flush();
}

/**
 * Tries to find a ressource file in the given locations.
 *
 * If a given location starts with a colon it is assumed to be a media
 * file, otherwise it is assumed to be relative to the current template
 *
 * @param string[] $search locations to look at
 * @param bool $abs if to use absolute URL
 * @param array    &$imginfo filled with getimagesize()
 * @param bool $fallback use fallback image if target isn't found or return 'false' if potential
 *                                false result is required
 * @return string
 *
 * @author Andreas  Gohr <andi@splitbrain.org>
 */
function tpl_getMediaFile($search, $abs = false, &$imginfo = null, $fallback = true)
{
    $img = '';
    $file = '';
    $ismedia = false;
    // loop through candidates until a match was found:
    foreach ($search as $img) {
        if (str_starts_with($img, ':')) {
            $file = mediaFN($img);
            $ismedia = true;
        } else {
            $file = tpl_incdir() . $img;
            $ismedia = false;
        }

        if (file_exists($file)) break;
    }

    // manage non existing target
    if (!file_exists($file)) {
        // give result for fallback image
        if ($fallback) {
            $file = DOKU_INC . 'lib/images/blank.gif';
            // stop process if false result is required (if $fallback is false)
        } else {
            return false;
        }
    }

    // fetch image data if requested
    if (!is_null($imginfo)) {
        $imginfo = getimagesize($file);
    }

    // build URL
    if ($ismedia) {
        $url = ml($img, '', true, '', $abs);
    } else {
        $url = tpl_basedir() . $img;
        if ($abs) $url = DOKU_URL . substr($url, strlen(DOKU_REL));
    }

    return $url;
}

/**
 * PHP include a file
 *
 * either from the conf directory if it exists, otherwise use
 * file in the template's root directory.
 *
 * The function honours config cascade settings and looks for the given
 * file next to the ´main´ config files, in the order protected, local,
 * default.
 *
 * Note: no escaping or sanity checking is done here. Never pass user input
 * to this function!
 *
 * @param string $file
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 * @author Anika Henke <anika@selfthinker.org>
 */
function tpl_includeFile($file)
{
    global $config_cascade;
    foreach (['protected', 'local', 'default'] as $config_group) {
        if (empty($config_cascade['main'][$config_group])) continue;
        foreach ($config_cascade['main'][$config_group] as $conf_file) {
            $dir = dirname($conf_file);
            if (file_exists("$dir/$file")) {
                include("$dir/$file");
                return;
            }
        }
    }

    // still here? try the template dir
    $file = tpl_incdir() . $file;
    if (file_exists($file)) {
        include($file);
    }
}

/**
 * Returns <link> tag for various icon types (favicon|mobile|generic)
 *
 * @param array $types - list of icon types to display (favicon|mobile|generic)
 * @return string
 *
 * @author Anika Henke <anika@selfthinker.org>
 */
function tpl_favicon($types = ['favicon'])
{

    $return = '';

    foreach ($types as $type) {
        switch ($type) {
            case 'favicon':
                $look = [':wiki:favicon.ico', ':favicon.ico', 'images/favicon.ico'];
                $return .= '<link rel="shortcut icon" href="' . tpl_getMediaFile($look) . '" />' . NL;
                break;
            case 'mobile':
                $look = [':wiki:apple-touch-icon.png', ':apple-touch-icon.png', 'images/apple-touch-icon.png'];
                $return .= '<link rel="apple-touch-icon" href="' . tpl_getMediaFile($look) . '" />' . NL;
                break;
            case 'generic':
                // ideal world solution, which doesn't work in any browser yet
                $look = [':wiki:favicon.svg', ':favicon.svg', 'images/favicon.svg'];
                $return .= '<link rel="icon" href="' . tpl_getMediaFile($look) . '" type="image/svg+xml" />' . NL;
                break;
        }
    }

    return $return;
}

/**
 * Prints full-screen media manager
 *
 * @author Kate Arzamastseva <pshns@ukr.net>
 */
function tpl_media()
{
    global $NS, $IMG, $JUMPTO, $REV, $lang, $fullscreen, $INPUT;
    $fullscreen = true;
    require_once DOKU_INC . 'lib/exe/mediamanager.php';

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

    echo '<div id="mediamanager__page">' . NL;
    echo '<h1>' . $lang['btn_media'] . '</h1>' . NL;
    html_msgarea();

    echo '<div class="panel namespaces">' . NL;
    echo '<h2>' . $lang['namespaces'] . '</h2>' . NL;
    echo '<div class="panelHeader">';
    echo $lang['media_namespaces'];
    echo '</div>' . NL;

    echo '<div class="panelContent" id="media__tree">' . NL;
    media_nstree($NS);
    echo '</div>' . NL;
    echo '</div>' . NL;

    echo '<div class="panel filelist">' . NL;
    tpl_mediaFileList();
    echo '</div>' . NL;

    echo '<div class="panel file">' . NL;
    echo '<h2 class="a11y">' . $lang['media_file'] . '</h2>' . NL;
    tpl_mediaFileDetails($image, $rev);
    echo '</div>' . NL;

    echo '</div>' . NL;
}

/**
 * Return useful layout classes
 *
 * @return string
 *
 * @author Anika Henke <anika@selfthinker.org>
 */
function tpl_classes()
{
    global $ACT, $conf, $ID, $INFO;
    /** @var Input $INPUT */
    global $INPUT;

    $classes = [
        'dokuwiki',
        'mode_' . $ACT,
        'tpl_' . $conf['template'],
        $INPUT->server->bool('REMOTE_USER') ? 'loggedIn' : '',
        (isset($INFO['exists']) && $INFO['exists']) ? '' : 'notFound',
        ($ID == $conf['start']) ? 'home' : ''
    ];
    return implode(' ', $classes);
}

/**
 * Create event for tools menues
 *
 * @param string $toolsname name of menu
 * @param array $items
 * @param string $view e.g. 'main', 'detail', ...
 *
 * @author Anika Henke <anika@selfthinker.org>
 * @deprecated 2017-09-01 see devel:menus
 */
function tpl_toolsevent($toolsname, $items, $view = 'main')
{
    dbg_deprecated('see devel:menus');
    $data = ['view' => $view, 'items' => $items];

    $hook = 'TEMPLATE_' . strtoupper($toolsname) . '_DISPLAY';
    $evt = new Event($hook, $data);
    if ($evt->advise_before()) {
        foreach ($evt->data['items'] as $html) echo $html;
    }
    $evt->advise_after();
}