<?php
/**
 * DokuWiki Plugin linkpagechild (Syntax Component)
 *
 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
 * @author  Brendan Kidwell <snarf@glump.net>
 */

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

class syntax_plugin_linkpagechild extends DokuWiki_Syntax_Plugin
{
    /**
     * @return string Syntax mode type
     */
    public function getType()
    {
        return 'substition';
    }

    /**
     * @return string Paragraph type
     */
    public function getPType()
    {
        return 'normal';
    }

    /**
     * @return int Sort order - Low numbers go before high numbers
     */
    public function getSort()
    {
        return 299;
    }

    /**
     * Connect lookup pattern to lexer.
     *
     * @param string $mode Parser mode
     */
    public function connectTo($mode)
    {
        // match internal links and media links with paths starting with "::"
        $this->Lexer->addSpecialPattern('\[\[ ?::[^\]]+\]\]', $mode, 'plugin_linkpagechild');
        $this->Lexer->addSpecialPattern('\{\{ ?::[^\}]+\}\}', $mode, 'plugin_linkpagechild');
    }

    /**
     * Handle matches of the linkpagechild syntax
     *
     * @param string       $match   The match of the syntax
     * @param int          $state   The state of the handler
     * @param int          $pos     The position in the document
     * @param Doku_Handler $handler The handler
     *
     * @return array Data for the renderer
     */
    public function handle($match, $state, $pos, Doku_Handler $handler)
    {
        // Rewrite "::" at start of target path to be the namespace given by the current page ID.
        $id = pageinfo()['id'];
        preg_match('/(\[\[|\{\{)( ?)::(.*)/', $match, $out);
        $rewritten = $out[1] . $out[2] . ":$id:" . $out[3];
        //var_dump($id);print("<br />\n");var_dump($rewritten);exit(0);
        if($out[1] == '[[') {
            // Call core internal link handler.
            $handler->internallink($rewritten, $state, $pos);
        } else {
            // Call core media link handler.
            $handler->media($rewritten, $state, $pos);
        }
        return [];
    }

    /**
     * Render xhtml output or metadata
     *
     * @param string        $mode     Renderer mode (supported modes: xhtml)
     * @param Doku_Renderer $renderer The renderer
     * @param array         $data     The data from the handler() function
     *
     * @return bool If rendering was successful.
     */
    public function render($mode, Doku_Renderer $renderer, $data)
    {
        // The core should be rendering our output, so we do nothing here.
        return false;
    }
}