<?php
namespace dokuwiki\plugin\struct\types;
use dokuwiki\plugin\struct\meta\QueryBuilder;

/**
 * Class Page
 *
 * Represents a single page in the wiki. Will be linked in output.
 *
 * @package dokuwiki\plugin\struct\types
 */
class Page extends AbstractMultiBaseType {

    protected $config = array(
        'usetitles' => false,
        'autocomplete' => array(
            'mininput' => 2,
            'maxresult' => 5,
            'namespace' => '',
            'postfix' => '',
        ),
    );

    /**
     * Output the stored data
     *
     * @param string $value the value stored in the database - JSON when titles are used
     * @param \Doku_Renderer $R the renderer currently used to render the data
     * @param string $mode The mode the output is rendered in (eg. XHTML)
     * @return bool true if $mode could be satisfied
     */
    public function renderValue($value, \Doku_Renderer $R, $mode) {
        if($this->config['usetitles']) {
            list($id, $title) = json_decode($value);
        } else {
            $id = $value;
            $title = null;
        }

        if(!$id) return true;

        $R->internallink(":$id", $title);
        return true;
    }

    /**
     * Cleans the link
     *
     * @param string $value
     * @return string
     */
    public function validate($value) {
        return cleanID($value);
    }

    /**
     * Autocompletion support for pages
     *
     * @return array
     */
    public function handleAjax() {
        global $INPUT;

        // check minimum length
        $lookup = trim($INPUT->str('search'));
        if(utf8_strlen($lookup) < $this->config['autocomplete']['mininput']) return array();

        // results wanted?
        $max = $this->config['autocomplete']['maxresult'];
        if($max <= 0) return array();

        // lookup with namespace and postfix applied
        $namespace = $this->config['autocomplete']['namespace'];
        if($namespace) {
            // namespace may be relative, resolve in current context
            $namespace .= ':foo'; // resolve expects pageID
            resolve_pageid($INPUT->str('ns'), $namespace, $exists);
            $namespace = getNS($namespace);
        }
        $postfix = $this->config['postfix'];
        if($namespace) $lookup .= ' @' . $namespace;

        $data = ft_pageLookup($lookup, true, $this->config['usetitles']);
        if(!count($data)) return array();

        // this basically duplicates what we do in ajax_qsearch()
        $result = array();
        $counter = 0;
        foreach($data as $id => $title) {
            if($this->config['usetitles']) {
                $name = $title;
            } else {
                $ns = getNS($id);
                if($ns) {
                    $name = noNS($id) . ' (' . $ns . ')';
                } else {
                    $name = $id;
                }
            }

            // check suffix
            if($postfix && !substr($id, -1 * strlen($postfix)) == $postfix) {
                continue; // page does not end in postfix, don't suggest it
            }

            $result[] = array(
                'label' => $name,
                'value' => $id
            );

            $counter++;
            if($counter > $max) break;
        }

        return $result;
    }

    /**
     * When using titles, we need ot join the titles table
     *
     * @param QueryBuilder $QB
     * @param string $tablealias
     * @param string $colname
     * @param string $alias
     */
    public function select(QueryBuilder $QB, $tablealias, $colname, $alias) {
        if(!$this->config['usetitles']) {
            parent::select($QB, $tablealias, $colname, $alias);
            return;
        }
        $rightalias = $QB->generateTableAlias();
        $QB->addLeftJoin($tablealias, 'titles', $rightalias, "$tablealias.$colname = $rightalias.pid");
        $QB->addSelectStatement("JSON($tablealias.$colname, $rightalias.title)", $alias);
    }

    /**
     * Return the pageid only
     *
     * @param string $value
     * @return string
     */
    public function rawValue($value) {
        if($this->config['usetitles']) {
            list($value) = json_decode($value);
        }
        return $value;
    }

    /**
     * When using titles, we need to compare against the title table, too
     *
     * @param QueryBuilder $QB
     * @param string $tablealias
     * @param string $colname
     * @param string $comp
     * @param string $value
     * @param string $op
     */
    public function filter(QueryBuilder $QB, $tablealias, $colname, $comp, $value, $op) {
        if(!$this->config['usetitles']) {
            parent::filter($QB, $tablealias, $colname, $comp, $value, $op);
            return;
        }

        $rightalias = $QB->generateTableAlias();
        $QB->addLeftJoin($tablealias, 'titles', $rightalias, "$tablealias.$colname = $rightalias.pid");

        // compare against page and title
        $sub = $QB->filters()->where($op);
        $pl = $QB->addValue($value);
        $sub->whereOr("$tablealias.$colname $comp $pl");
        $pl = $QB->addValue($value);
        $sub->whereOr("$rightalias.title $comp $pl");
    }

}