<?php

class MainHandler extends request_handler {

    public function GET_index() {
        global $config;

        $posts_lang = PostLanguage::English;
        $posts = posts::getList(0, 3,
            include_hidden: isAdmin(),
            filter_by_lang: $posts_lang);

        $this->skin->addMeta([
            'og:type' => 'website',
            '@url' => 'https://'.$config['domain'].'/',
            '@title' => lang('meta_index_title'),
            '@description' => lang('meta_index_description'),
            '@image' => 'https://'.$config['domain'].'/img/4in1-preview.jpg'
        ]);
        $this->skin->setTitle('$site_title');
        $this->skin->set([
            'posts' => $posts,
            'posts_lang' => $posts_lang,
            'versions' => $config['book_versions']
        ]);
        $this->skin->setRenderOptions(['is_index' => true]);
        $this->skin->renderPage('index.twig');
    }

    public function GET_about() { self::redirect('/info/'); }
    public function GET_contacts() { self::redirect('/info/'); }

    public function GET_page() {
        global $config;
        list($name) = $this->input('name');

        $page = pages::getByName($name);
        if (!$page) {
            if (isAdmin()) {
                $this->skin->setTitle($name);
                $this->skin->renderPage('admin_page_new.twig', [
                    'short_name' => $name
                ]);
            }
            self::notFound();
        }

        if (!isAdmin() && !$page->visible)
            self::notFound();

        $bc = null;
        $render_opts = [];
        if ($page) {
            $this->skin->addMeta([
                '@url' => 'https://'.$config['domain'].$page->getUrl(),
                '@title' => $page->title,
            ]);

            if ($page->parentId) {
                $bc = [];
                $parent = $page;
                while ($parent?->parentId) {
                    $parent = pages::getById($parent->parentId);
                    if ($parent)
                        $bc[] = ['url' => $parent->getUrl(), 'text' => $parent->title];
                }
                if (empty($bc))
                    $bc = null;
            }

            if ($page->shortName == 'info')
                $render_opts = ['head_section' => 'about'];
            else if ($page->shortName == $config['wiki_root'])
                $render_opts = ['head_section' => $page->shortName];
        }

        $this->skin->setRenderOptions($render_opts);
        $this->skin->setTitle($page ? $page->title : '???');
        $this->skin->renderPage('page.twig', [
            'page' => $page,
            'html' => $page->getHtml(isRetina(), themes::getUserTheme()),
            'bc' => $bc,
            'delete_token' => self::getCSRF('delpage'.$page->shortName)
        ]);
    }

    public function GET_post() {
        global $config;
        list($name, $input_lang) = $this->input('name, lang');

        $lang = null;
        try {
            if ($input_lang)
                $lang = PostLanguage::from($input_lang);
        } catch (ValueError $e) {
            self::notFound($e->getMessage());
        }

        if (!$lang)
            $lang = PostLanguage::getDefault();

        $post = posts::getByName($name);
        if (!$post || (!$post->visible && !isAdmin()))
            self::notFound();

        if ($lang == PostLanguage::getDefault() && $input_lang == $lang->value)
            self::redirect($post->getUrl());
        if (!$post->hasLang($lang))
            self::notFound('no text for language '.$lang->name);
        if (!$post->visible && !isAdmin())
            self::notFound();

        $pt = $post->getText($lang);

        $other_langs = [];
        foreach (PostLanguage::cases() as $pl) {
            if ($pl == $lang)
                continue;
            if ($post->hasLang($pl))
                $other_langs[] = $pl->value;
        }

        $meta = [
            '@title' => $pt->title,
            '@url' => $config['domain'].$post->getUrl(),
            '@description' => $pt->getDescriptionPreview(155)
        ];
        if ($pt->keywords)
            $meta['@keywords'] = $pt->keywords;
        $this->skin->addMeta($meta);
        if (($img = $pt->getFirstImage()) !== null)
            $this->skin->addMeta(['@image' => $img->getDirectUrl()]);

        $this->skin->setTitle($pt->title);
        $this->skin->setRenderOptions(['articles_lang' => $lang->value, 'wide' => $pt->hasTableOfContents()]);
        $this->skin->renderPage('post.twig', [
            'post' => $post,
            'pt' => $pt,
            'html' => $pt->getHtml(isRetina(), themes::getUserTheme()),
            'selected_lang' => $lang->value,
            'other_langs' => $other_langs,
            'delete_token' => self::getCSRF('delpost'.$post->id)
        ]);
    }

    public function GET_rss() {
        global $config;

        $lang = PostLanguage::getDefault();
        $items = array_map(function(Post $post) use ($lang) {
            $pt = $post->getText($lang);
            return [
                'title' => $pt->title,
                'link' => $post->getUrl(),
                'pub_date' => date(DATE_RSS, $post->getTimestamp()),
                'description' => $pt->getDescriptionPreview(500)
            ];
        }, posts::getList(0, 20, filter_by_lang: $lang));

        $body = $this->skin->render('rss.twig', [
            'title' => lang('site_title'),
            'link' => 'https://'.$config['domain'],
            'rss_link' => 'https://'.$config['domain'].'/feed.rss',
            'items' => $items
        ]);

        header('Content-Type: application/rss+xml; charset=utf-8');
        echo $body;
        exit;
    }

    public function GET_articles() {
        list($lang) = $this->input('lang');
        if ($lang) {
            $lang = PostLanguage::tryFrom($lang);
            if (!$lang || $lang == PostLanguage::getDefault())
                self::redirect('/articles/');
        } else {
            $lang = PostLanguage::getDefault();
        }

        $posts = posts::getList(
            include_hidden: isAdmin(),
            filter_by_lang: $lang);

        $this->skin->setTitle('$articles');
        $this->skin->addMeta([
            '@description' => lang('blog_expl_'.$lang->value)
        ]);
        $this->skin->setRenderOptions(['head_section' => 'articles']);
        $this->skin->renderPage('articles.twig', [
            'posts' => $posts,
            'selected_lang' => $lang->value
        ]);
    }

}