<?php
/*************************************************************
# 076 License

Copyright (c) テクニカル諏訪子

Permission is hereby granted to any person obtaining a copy of the software
Little Beast (the "Software") to use, modify, merge, copy, publish, distribute,
sublicense, and/or sell copies of the Software, subject to the following conditions:

    1. **Origin Attribution**:
       - You must not misrepresent the origin of the Software; you must not claim
         you created the original Software.
       - If the Software is used in a product, you must either:
         a. Provide clear attribution in the product's documentation, user interface,
            or other visible areas, **OR**
         b. Pay the original developers a fee they specify in writing.
    2. **Usage Restriction**:
       - The Software, or any derivative works, dependencies, or libraries
         incorporating it, must not be used for censorship or to suppress freedom of
         speech, expression, or creativity. Prohibited uses include, but are not
         limited to:
         - Censorship of so-called "hate speech", visuals, non-mainstream opinions,
           ideas, or objective reality.
         - Tools or systems designed to restrict access to information or
           artistic works.
    3. **Notice Preservation**:
       - This license and the above copyright notice must remain intact in all copies
         of the source code.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
namespace Site\Controller;

use Site\Controller\BlogPost;
use Site\Controller\Mods;
use Std\Lib\Activitypub;
use Std\Lib\Auth;
use Std\Lib\Markdown;
use Std\Lib\Template;
use Roles;

class Home extends BlogPost {
  use Mods;

  private array $searchKeywords = [];
  private string $domain = 'technicalsuwako.moe';

  //------------------------------------------
  // ページ
  //------------------------------------------

  /**
   * ブログ投稿ページ
   *
   * @param array $params ページ番号等
   * @return void
   */
  public function show(array $params): void {
    try {
      $page = isset($_GET['page']) ? $_GET['page'] : 1;
      $postsPerPage = 20;

      $tmpl = new Template('/');
      $pagetit = 'トップページ';

      $description = 'テクニカル諏訪子ちゃんの個人ブログ';

      // ユーザー
      $auth = new Auth();
      $user = $auth->getLoggedInUser();

      $posts = $this->getPosts('/blog/', $user);
      if (!is_array($posts)) $posts = [];

      // 検索機能が使用されている場合
      if (isset($_GET['q']) && !empty($_GET['q'])) {
        $this->searchKeywords = array_map('trim', explode(',', $_GET['q']));
        $posts = $this->searchPosts($this->searchKeywords, $posts, '/blog/');
        $pagetit = '検索結果: '.htmlspecialchars($_GET['q']);

        // 検索結果にキーワードをハイライト
        $posts = $this->highlightKeywords($posts);
      }

      // ページネーション
      $totalPosts = count($posts);
      $totalPages = ceil($totalPosts / $postsPerPage);
      $page = min($page, $totalPages);
      $currentPosts = array_slice(
        $posts, 
        ($page - 1) * $postsPerPage, 
        $postsPerPage
      );

      $tmpl->assign('user', $user);
      $tmpl->assign('currentPage', $page);
      $tmpl->assign('totalPages', $totalPages);
      $tmpl->assign('posts', $currentPosts);
      $tmpl->assign('pagetit', $pagetit);
      $tmpl->assign('curblog', 'gd');
      $tmpl->assign('section', 'blog');
      $tmpl->assign('curPage', 'blog');
      $tmpl->assign('custCss', false);
      $tmpl->assign('menu', $this->getMenu());
      $tmpl->assign('description', $description);
      $tmpl->assign('searchActive', !empty($this->searchKeywords));

      $tmpl->addCss('news');
      $tmpl->addCss('search');
      $tmpl->addCss('blogtype');
      $tmpl->addCss('pagination');
      $tmpl->render('home');
    } catch (\Exception $e) {
      throw new \Exception($e->getMessage());
    }
  }

  /**
   * ブログ投稿ページ
   *
   * @param array $params マークダウンファイル等
   * @return void
   */
  public function article(array $params): void {
    $page = '';
    if (isset($params['page'])) $page = $params['page'];

    try {
      $tmpl = new Template('/');
      $md = new Markdown($page, '/blog/');

      $meta = $md->getMetadata();
      $pagetit = $meta->title;
      $article = $md->parse();
      $description = 'テクニカル諏訪子ちゃんの個人ブログ';

      // 検索からの遷移の場合、記事内のキーワードをハイライト
      if (isset($_GET['q']) && !empty($_GET['q'])) {
        $keywords = array_map('trim', explode(',', $_GET['q']));
        $article = $this->highlightTextContent($article, $keywords);
        $meta->title = $this->highlightTextContent($meta->title, $keywords);
      }

      // ユーザー
      $auth = new Auth();
      $user = $auth->getLoggedInUser();
      $isMember = $user !== NULL && $user->role !== Roles::BANNED;
      $isPaywall = $user !== NULL && ($user->role & Roles::SUBSCRIBER);
      $isStaff = $user !== NULL && ($user->role & (Roles::ADMIN | Roles::STAFF));
      $tmpl->assign('user', $user);

      $tmpl->assign('pagetit', $pagetit);
      $tmpl->assign('curPage', 'blog');
      $tmpl->assign('custCss', false);
      $tmpl->assign('curblog', 'gd');
      $tmpl->assign('section', 'blog');
      $tmpl->assign('menu', $this->getMenu());
      $tmpl->assign('article', $article);
      $tmpl->assign('meta', $meta);
      $tmpl->assign('description', $description);

      if (isset($meta->css) && !empty($meta->css)) {
        foreach ($meta->css as $v) {
          $tmpl->addCss($v);
        }
      }

      if (!$isMember && in_array('memberonly', $meta->category)) goto denyaccess;
      if ((!$isPaywall && !$isStaff) && in_array('subscriberonly', $meta->category)) goto denyaccess;
      if (!$isStaff && in_array('staffonly', $meta->category)) goto denyaccess;
      if (isset($meta->draft) && !$isStaff) goto denyaccess;

showpage:
      $this->assignComments($tmpl, 'blog', $page, $meta, $user);
      $tmpl->addCss('news-article');
      $tmpl->addCss('search');
      $tmpl->addCss('blogtype');
      $tmpl->addCss('code');
      $tmpl->render('article');
      exit();

denyaccess:
      unset($md, $meta, $pagetit, $article, $description);
      $tmpl->assign('pagetit', 'Not found');
      $tmpl->assign('curPage', '404');
      $tmpl->assign('menu', $this->getMenu());
      $tmpl->assign('description', '');
      $tmpl->render('404');
    } catch (\Exception $e) {
      throw new \Exception($e->getMessage());
    }
  }

  public function robots(array $params): void {
    $txt = "User-Agent: *\nDisallow: /login/\nDisallow: /register/";
    $tmpFile = tempnam(sys_get_temp_dir(), 'tmpl_');
    file_put_contents($tmpFile, $txt);

    include $tmpFile;
    unlink($tmpFile);
  }

  //------------------------------------------
  // 機能性
  //------------------------------------------

  /**
   * キーワードに基づいて投稿を検索する
   * 
   * @param array $keywords 検索キーワードの配列
   * @param array $posts 検索対象の投稿記事の配列
   * @return array 検索条件に一致する投稿記事の配列
   */
  private function searchPosts(array $keywords, array $posts, string $section): array {
    if (empty($keywords) || empty($posts)) {
      return $posts;
    }

    $foundPosts = [];
    $path = ROOT.$section;

    foreach ($posts as $post) {
      $matched = false;
      
      // タイトルで検索
      foreach ($keywords as $keyword) {
        $keyword = trim($keyword);
        if (empty($keyword)) continue;
        
        // タイトル内でキーワードが見つかった場合
        if (mb_stripos($post['title'], $keyword) !== false) {
          $foundPosts[] = $post;
          $matched = true;
          break;
        }
      }
      
      // すでにマッチしていれば次の記事へ
      if ($matched) continue;
      
      // 記事の本文をチェック
      $slug = $post['slug'];
      $filePath = $path.$slug.'.md';
      
      if (file_exists($filePath)) {
        $content = file_get_contents($filePath);
        $parts = explode('----', $content, 2);
        if (count($parts) > 1) {
          // コメントは検索しない（非公開のメモが検索で当たらない様に）
          $articleBody = trim(Markdown::stripComments($parts[1]));
          
          foreach ($keywords as $keyword) {
            $keyword = trim($keyword);
            if (empty($keyword)) continue;
            
            // 本文内でキーワードが見つかった場合
            if (mb_stripos($articleBody, $keyword) !== false) {
              $foundPosts[] = $post;
              break;
            }
          }
        }
      }
    }
    
    return $foundPosts;
  }

  /**
   * 検索結果の投稿内のキーワードをハイライトする
   * 
   * @param array $posts 検索結果の投稿配列
   * @return array ハイライト処理後の投稿配列
   */
  private function highlightKeywords(array $posts): array {
    if (empty($this->searchKeywords) || empty($posts)) {
      return $posts;
    }
    
    foreach ($posts as &$post) {
      // タイトルのハイライト
      if (!empty($post['title'])) {
        $post['title'] =
          $this->highlightTextContent($post['title'], $this->searchKeywords);
      }
      
      // プレビューのハイライト
      if (!empty($post['preview'])) {
        $post['preview'] =
          $this->highlightTextContent($post['preview'], $this->searchKeywords);
      }
    }
    
    return $posts;
  }
  
  /**
   * テキスト内のキーワードをハイライトする
   * 
   * @param string $text ハイライト対象のテキスト
   * @param array $keywords ハイライトするキーワード配列
   * @return string ハイライト処理後のテキスト
   */
  private function highlightTextContent(string $text, array $keywords): string {
    if (empty($keywords) || empty($text)) {
      return $text;
    }
    
    $alts = [];
    
    foreach ($keywords as $keyword) {
      $keyword = trim($keyword);
      $escaped = htmlspecialchars($keyword, ENT_QUOTES, 'UTF-8');
      if ($escaped === '') continue;
      $alts[] = preg_quote($escaped, '/');
    }
    if (empty($alts)) return $text;
    $pattern = '/('.implode('|', $alts).')/iu';

    $parts = preg_split('/(<[^>]*>|&[#\w]+;)/u', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
    if ($parts === false) return $text;

    foreach ($parts as $i => $part) {
      if ($part === '' || $part[0] === '<' || $part[0] === '&') continue;
      $res = preg_replace($pattern, '<span class="search-highlight">$1</span>', $part);
      if ($res !== null) $parts[$i] = $res;
    }
    
    return implode('', $parts);
  }
}