<?php
/**
 * Add-New-Page Plugin: a simple form for adding new pages.
 *
 * @license  GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author   iDO <ido@idotech.info>
 * @author   Sam Wilson <sam@samwilson.id.au>
 *
 * @noinspection PhpUnused
 * @noinspection PhpMissingParamTypeInspection, PhpMissingReturnTypeInspection
 */

use dokuwiki\Extension\SyntaxPlugin;
use dokuwiki\File\PageResolver;

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

class syntax_plugin_addnewpage extends SyntaxPlugin {

    /** @var array the parsed options */
    protected $options;

    /**
     * Syntax Type
     */
    public function getType() {
        return 'substition';
    }

    /**
     * Paragraph Type
     */
    public function getPType() {
        return 'block';
    }

    /**
     * @return int
     */
    public function getSort() {
        return 199;
    }

    /**
     * @param string $mode
     */
    public function connectTo($mode) {
        $this->Lexer->addSpecialPattern('\{\{NEWPAGE[^\}]*\}\}', $mode, 'plugin_addnewpage');
    }

    /**
     * Handler to prepare matched data for the rendering process.
     *
     * Handled syntax options:
     * - {{NEWPAGE}}
     * - {{NEWPAGE>your:namespace}}
     * - {{NEWPAGE>your:namespace:@INPUT@:start}}
     * - {{NEWPAGE>your:namespace:[date formats]}} {@see strftime()}
     * - {{NEWPAGE?config_overrides}}
     * - {{NEWPAGE?label=custom}}
     * - {{NEWPAGE#newtpl1,newtpl2}}
     * - {{NEWPAGE#newtpl1|Title1,newtpl2|Title1}}
     * - {{NEWPAGE>your:namespace#newtpl1|Title1,newtpl2|Title1}}
     * - {{NEWPAGE>your:namespace#newtpl1|Title1,newtpl2|Title1#@HI@,Howdy}}
     *
     * Refer to {@see https://www.dokuwiki.org/plugin:addnewpage} for details.
     *
     * @param   string $match The text matched by the patterns
     * @param   int $state The lexer state for the match
     * @param   int $pos The character position of the matched text
     * @param   Doku_Handler $handler The Doku_Handler object
     *
     * @return  array Return an array with all data you want to use in render
     * @codingStandardsIgnoreStart
     */
    public function handle($match, $state, $pos, Doku_Handler $handler) {
        /* @codingStandardsIgnoreEnd */
        $match = substr($match, 9, -2); // strip markup

        $data = array(
            'namespace' => '',
            'newpagetemplates' => array(),
            'newpagevars' => '',
            'options' => array(
                'exclude' => $this->getConf('addpage_exclude'),
                'showroot' => $this->getConf('addpage_showroot'),
                'hide' => $this->getConf('addpage_hide'),
                'hideacl' => $this->getConf('addpage_hideACL'),
                'autopage' => $this->getConf('addpage_autopage'),
                'createns' => $this->getConf('addpage_createns'),
                'label' => 'okbutton',
            )
        );

        if(preg_match('/>(.*?)(#|\?|$)/', $match, $m)) {
            $data['namespace'] = trim($m[1]);
        }

        # Extract the newpagetemplate plugin parameters
        # - after the initial #: the template name
        # - after optional 2nd #: custom variable names
        if(preg_match('/#(.*?)(?:#(.*?))?(?:\?|$)/', $match, $m)) {
            $data['newpagetemplates'] = array_map('trim', explode(',', $m[1]));
            $data['newpagevars'] = trim($m[2] ?? '');
        }

        if(preg_match('/\?(.*?)(#|$)/', $match, $m)) {
            $this->_parseOptions($m[1], $data['options']);
        }

        return $data;
    }

    /**
     * Create the new-page form.
     *
     * @param   $format   string        output format being rendered
     * @param   $renderer Doku_Renderer the current renderer object
     * @param   $data     array         data created by handler()
     * @return  boolean                 rendered correctly?
     */
    public function render($format, Doku_Renderer $renderer, $data) {
        global $lang;

        // make options available in class
        $this->options = $data['options'];

        if($format == 'xhtml') {
            $disablecache = false;
            $namespaceinput = $this->_htmlNamespaceInput($data['namespace'], $disablecache);
            if($namespaceinput === false) {
                if($this->options['hideacl']) {
                    $renderer->doc .= '';
                } else {
                    $renderer->doc .= $this->getLang('nooption');
                }
                return true;
            }
            if($disablecache) $renderer->info['cache'] = false;

            $newpagetemplateinput = $this->_htmlTemplateInput($data['newpagetemplates']);

            $input = 'text';
            if($this->options['autopage']) $input = 'hidden';

            // Button label. If given string is not localized, use it as-is
            $label = $this->getLang($this->options['label']);
            if (!$label) {
                $label = $this->options['label'];
            }

            $form = '<div class="addnewpage"><p>'
                . '<form name="addnewpage" method="get" action="' . DOKU_BASE . DOKU_SCRIPT
                    . '" accept-charset="' . $lang['encoding'] . '">'
                . $namespaceinput
                . '<input class="edit" type="' . $input . '" name="title" size="20" maxlength="255" tabindex="2" placeholder="'
                    . $this->getLang('name')
                    // Use a data attribute to pass the createns option's state to JavaScript
                    . '" data-createns="' . $this->options['createns'] 
                    . '"/>'
                . $newpagetemplateinput
                . '<input type="hidden" name="newpagevars" value="' . $data['newpagevars'] . '"/>'
                . '<input type="hidden" name="do" value="edit" />'
                . '<input type="hidden" name="id" />'
                . '<input class="button" type="submit" value="' . $label . '" tabindex="4" />'
                . '</form>'
                . '</p></div>';

            $renderer->doc .= $form;

            return true;
        }
        return false;
    }

    /**
     * Overwrites the $options with the ones parsed from $optstr
     *
     * @param string $optstr
     * @param array $options
     * @author Andreas Gohr <gohr@cosmocode.de>
     */
    protected function _parseOptions($optstr, &$options) {
        $opts = preg_split('/[,&]/', $optstr);

        foreach($opts as $opt) {
            $opt_lower = strtolower(trim($opt));
            $val = true;
            // booleans can be negated with a no prefix
            if(substr($opt_lower, 0, 2) == 'no') {
                $opt_lower = substr($opt, 2);
                $val = false;
            }

            // not a known option? might be a key=value pair
            if(!isset($options[$opt_lower])) {
                $split = array_map('trim', sexplode('=', $opt, 2));
                $opt_lower = strtolower($split[0]);
                $val = $split[1];
            }

            // still unknown? skip it
            if(!isset($options[$opt_lower])) continue;

            // overwrite the current value
            $options[$opt_lower] = $val;
        }
    }

    /**
     * Parse namespace request
     *
     * This creates the final ID to be created (still having an @INPUT@ variable
     * which is filled in via JavaScript)
     *
     * @author Samuele Tognini <samuele@cli.di.unipi.it>
     * @author Michael Braun <michael-dev@fami-braun.de>
     * @author Andreas Gohr <gohr@cosmocode.de>
     * @param string $ns The namespace as given in the syntax
     * @return string
     */
    protected function _parseNS($ns) {
        global $INFO;

        $selfid = $INFO['id'];
        $selfns = getNS($selfid);
        // replace the input variable with something unique that survives cleanID
        $keep = sha1(time());

        // by default append the input to the namespace (except on autopage)
        if(strpos($ns, '@INPUT@') === false && !$this->options['autopage']) $ns .= ":@INPUT@";

        // date replacements
        $ns = dformat(null, $ns);

        // placeholders
        $replacements = array(
            '/\//' => ':', // forward slashes to colons
            '/@PAGE@/' => $selfid,
            '/@NS@/' => $selfns,
            '/^\.(:|\/|$)/' => "$selfns:",
            '/@INPUT@/' => $keep,
        );
        $ns = preg_replace(array_keys($replacements), array_values($replacements), $ns);

        // clean up, then reinsert the input variable
        $ns = cleanID($ns);
        return str_replace($keep, '@INPUT@', $ns);
    }

    /**
     * Create the HTML Select element for namespace selection.
     *
     * @param string|false $dest_ns The destination namespace, or false if none provided.
     * @param bool $disablecache reference indicates if caching need to be disabled
     * @global string $ID The page ID
     * @return string Select element with appropriate NS selected.
     */
    protected function _htmlNamespaceInput($dest_ns, &$disablecache) {
        global $ID;
        $disablecache = false;

        // If a NS has been provided:
        // Whether to hide the NS selection (otherwise, show only subnamespaces).
        $hide = $this->options['hide'];

        $parsed_dest_ns = $this->_parseNS($dest_ns);
        // Whether the user can create pages in the provided NS (or root, if no
        // destination NS has been set.
        $can_create = (auth_quickaclcheck($parsed_dest_ns . ":") >= AUTH_CREATE);

        //namespace given, but hidden
        if($hide && !empty($dest_ns)) {
            if($can_create) {
                return '<input type="hidden" name="np_cat" id="np_cat" value="' . $parsed_dest_ns . '"/>';
            } else {
                return false;
            }
        }

        //show select of given namespace
        $currentns = getNS($ID);

        $ret = '<select class="edit" id="np_cat" name="np_cat" tabindex="1">';

        // Whether the NS select element has any options
        $someopt = false;

        // Show root namespace if requested and allowed
        if($this->options['showroot'] && $can_create) {
            if(empty($dest_ns)) {
                // If no namespace has been provided, add an option for the root NS.
                $ret .= '<option ' . (($currentns == '') ? 'selected ' : '') . ' value="">' . $this->getLang('namespaceRoot') . '</option>';
            } else {
                // If a namespace has been provided, add an option for it.
                $ret .= '<option ' . (($currentns == $dest_ns) ? 'selected ' : '') . ' value="' . formText($dest_ns) . '">' . formText($dest_ns) . '</option>';
            }
            $someopt = true;
        }

        $subnamespaces = $this->_getNamespaceList($dest_ns);

        // The top of this stack will always be the last printed ancestor namespace
        $ancestor_stack = array();
        if (!empty($dest_ns)) {
            $ancestor_stack[] = $dest_ns;
        }

        foreach($subnamespaces as $ns) {

            if(auth_quickaclcheck($ns . ":") < AUTH_CREATE) continue;

            // Pop any elements off the stack that are not ancestors of the current namespace
            while(!empty($ancestor_stack) && strpos($ns, $ancestor_stack[count($ancestor_stack) - 1] . ':') !== 0) {
                array_pop($ancestor_stack);
            }

            $nsparts = explode(':', $ns);
            $first_unprinted_depth = empty($ancestor_stack) ? 1 : (2 + substr_count($ancestor_stack[count($ancestor_stack) - 1], ':'));
            for($i = $first_unprinted_depth, $end = count($nsparts); $i <= $end; $i++) {
                $namespace = implode(':', array_slice($nsparts, 0, $i));
                $ancestor_stack[] = $namespace;
                $selectOptionText = str_repeat('&nbsp;&nbsp;', substr_count($namespace, ':')) . $nsparts[$i - 1];
                $ret .= '<option ' .
                    (($currentns == $namespace) ? 'selected ' : '') .
                    ($i == $end ? ('value="' . $namespace . '">') : 'disabled>') .
                    $selectOptionText .
                    '</option>';
            }
            $someopt = true;
            $disablecache = true;
        }

        $ret .= '</select>';

        if($someopt) {
            return $ret;
        } else {
            return false;
        }
    }

    /**
     * Get a list of namespaces below the given namespace.
     * Recursively fetches subnamespaces.
     *
     * @param string $topns The top namespace
     * @return array Multi-dimensional array of all namespaces below $tns
     */
    protected function _getNamespaceList($topns = '') {
        global $conf;

        $topns = utf8_encodeFN(str_replace(':', '/', $topns));

        $excludes = $this->options['exclude'];
        if($excludes == "") {
            $excludes = array();
        } else {
            $excludes = @explode(';', strtolower($excludes));
        }
        $searchdata = array();
        search($searchdata, $conf['datadir'], 'search_namespaces', array(), $topns);

        $namespaces = array();
        foreach($searchdata as $ns) {
            foreach($excludes as $exclude) {
                if(!empty($exclude) && strpos($ns['id'], $exclude) === 0) {
                    continue 2;
                }
            }
            $namespaces[] = $ns['id'];
        }

        return $namespaces;
    }

    /**
     * Create html for selection of namespace templates
     *
     * @param array $newpagetemplates array of namespace templates
     * @return string html of select or hidden input
     */
    public function _htmlTemplateInput($newpagetemplates) {
        $cnt = count($newpagetemplates);
        if($cnt < 1 || $cnt == 1 && $newpagetemplates[0] == '') {
            $input = '';

        } else {
            if($cnt == 1) {
                list($template,) = $this->_parseNSTemplatePage($newpagetemplates[0]);
                $input = '<input type="hidden" name="newpagetemplate" value="' . formText($template) . '" />';
            } else {
                $first = true;
                $input = '<select name="newpagetemplate" tabindex="3">';
                foreach($newpagetemplates as $template) {
                    $p = ($first ? ' selected="selected"' : '');
                    $first = false;

                    list($template, $name) = $this->_parseNSTemplatePage($template);
                    $p .= ' value="' . formText($template) . '"';
                    $input .= "<option $p>" . formText($name) . "</option>";
                }
                $input .= '</select>';
            }
            $input = DOKU_TAB . DOKU_TAB . $input . DOKU_LF;
        }
        return $input;
    }

    /**
     * Parses and resolves the namespace template page
     *
     * @param $nstemplate
     * @return array
     */
    protected function _parseNSTemplatePage($nstemplate) {
        global $ID;

        @list($template, $name) = explode('|', $nstemplate, 2);
        $template = (new PageResolver($ID))->resolveId($template);
        if (is_null($name)) $name = $template;

        return array($template, $name);
    }

}