<?php

require_once('Twig/autoload.php');

use Twig\Loader\LoaderInterface;
use Twig\Source;
use Twig\Extension\AbstractExtension;
use Twig\Environment;
use Twig\TwigFilter;

class Twig_Loader_Dokuwiki implements LoaderInterface
{
    private function build_pagename($name) {
        return 'hostinfo:templates:' . cleanID($name);
    }

    public function getSourceContext(string $name): Source
    {
        $page = $this->build_pagename($name);
        $source = rawWiki($page);

        if (!$source) {
            throw new \Twig\Error\LoaderError(sprintf('Template "%s" does not exist.', $name));
        }

        return new \Twig\Source($source, $name);
    }

    public function getCacheKey(string $name): string
    {
        return $this->build_pagename($name);
    }

    public function isFresh(string $name, int $time): bool
    {
        $page = $this->build_pagename($name);
        $last_change = p_get_metadata($page, 'last_change date');
        return $last_change < $time;
    }

    public function exists(string $name)
    {
        $page = $this->build_pagename($name);
        return page_exists($page);
    }
}

class Hostinfo_Twig_Extension extends AbstractExtension
{
    public function getFilters()
    {
        return array(
            new TwigFilter('contact_info', function($value) {
                if (is_array($value)) {
                    return '[[' . current($value) . '|' . key($value) . ']]';
                }

                return '[[' . $value . '@spline.inf.fu-berlin.de' . '|' . $value . ']]';
            }),

            new TwigFilter('parse_service', function($value) {
                if (is_array($value)) {
                    return array(
                        'port' => current($value),
                        'name' => key($value),
                    );
                }

                return array(
                    'name' => $value,
                    'port' => null,
                );
            }),

            new TwigFilter('group_by', function($value, $key) {
                $array = array();

                foreach ($value as $k => $v) {
                    if (array_key_exists($key, $v)) {
                        if (is_array($v[$key])) {
                            foreach ($v[$key] as $key_part) {
                                $array[$key_part][$k] = $v;
                            }
                        }
                        else {
                            $array[$v[$key]][$k] = $v;
                        }
                    }
                }

                return $array;
            }),

            new TwigFilter('key_not_exists', function($value, $key) {
                if (!is_array($value)) {
                    return array();
                }

                return array_filter($value,
                    function($v) use ($key) {
                        return !array_key_exists($key, $v);
                    });
            }),

            new TwigFilter('count', function($value) {
                return count($value);
            }),

            new TwigFilter('length', function($value) {
                return strlen($value);
            }),
        );
    }

    public function getName()
    {
        return 'hostinfo';
    }
}

class Twig
{
    function __construct()
    {
        $loader = new Twig_Loader_Dokuwiki();
        $this->twig = new Environment($loader, array(
            'cache' => __DIR__ . '/../templates_c/',
            'auto_reload' => true,
        ));
        $this->twig->addExtension(new Hostinfo_Twig_Extension());
    }

    public function render(string $template, $vars=null)
    {
        $tmpl = $this->twig->load($template . '.tpl');
        return $tmpl->render($vars);
    }
}

// vim: set ts=4 sw=4 tw=0 et :