<?PHP
  Uses('user', 'templates');
  
  
  class Pages {
    var $pages = array();
    
    
    function GetTitle($page) {
      if(!$this->Exists($page))
        return $page;
      
      $pagedata = $this->GetPageData($page);
      
      $data = $pagedata['data'];
      $data['_page'] = $page;
      
      return $GLOBALS['templates'][$pagedata['template']]->GetTitle($data);
    }
    
    function GetPage($page) {
      if(!$this->Exists($page))
        return array('title' => $page,
                     'content' => '<span class="error">{{The page \'' . $page . '\' does not exist.}}</span>');
      
      if(!$this->HasReadAccess($page))
        return array('title' => $page,
                     'content' => '<span class="error">{{The page \'' . $page . '\' is protected.}}</span>');
      
      $pagedata = $this->GetPageData($page);
      
      $data = $pagedata['data'];
      $data['_page'] = $page;
      
      $ret = $GLOBALS['templates'][$pagedata['template']]->GetPage($data);
      
      return array('title' => $ret['title'], 'content' => $ret['content']);
    }
    
    function GetEditor($page, $backlink) {
      if(!$this->Exists($page))
        return array('title' => $page,
                     'content' => '<span class="error">{{The page \'' . $page . '\' does not exist.}}</span>');
      
      if(!$this->HasWriteAccess($page))
        return array('title' => $page,
                     'content' => '<span class="error">{{The page \'' . $page . '\' is protected.}}</span>');
      
      $pagedata = $this->GetPageData($page);
      
      $data = $pagedata['data'];
      $data['_page'] = $page;
      $data['_backlink'] = $backlink;
      
      $ret = $GLOBALS['templates'][$pagedata['template']]->GetEditor($data);
      
      return array('title' => $ret['title'], 'content' => $ret['content']);
    }
    
    function Exists($page) {
      if(array_key_exists($page, $GLOBALS['modules']->pages))
        return true;
      
      $res = $GLOBALS['db']->Execute('SELECT id FROM pages WHERE name = ?', $page);
      
      return ($res->RecordCount() > 0);
    }
    
    function HasReadAccess($page) {
      if(!$this->Exists($page)) return false;
      if($GLOBALS['user']->IsAdmin()) return true;
      
      $gid = $GLOBALS['user']->gid;
      
      $access = $this->GetAccess($page);
      
      return ((hexdec($access[0][$gid/4]) & (1 << ($gid%4))) != 0);
    }
    
    function HasWriteAccess($page) {
      if(!$this->Exists($page)) return false;
      if($GLOBALS['user']->IsAdmin()) return true;
      
      $gid = $GLOBALS['user']->gid;
      
      $access = $this->GetAccess($page);
      
      return ((hexdec($access[1][$gid/4]) & (1 << ($gid%4))) != 0);
    }
    
    function GetPageData($page) {
      if(!$this->Exists($page)) return null;
      
      if(!array_key_exists($page, $this->pages)) {
        $res = $GLOBALS['db']->Execute('SELECT template, data FROM pages WHERE name = ?', $page);
      
        if($res->RecordCount()) {
          parse_str($res->fields[1], $data);
          $data = array_map('Unquote', $data);
          
          $this->pages[$page] = array('name' => $page, 'template' => $res->fields[0],
                                                    'access' => '', 'data' => $data);
        }
        else {
          $xmldata = $GLOBALS['xmlparser']->ParseFile($GLOBALS['modules']->GetPagePath($page));
          if(!$xmldata) return null;
          
          $info = $GLOBALS['xmlparser']->FindTag($xmldata, 'info');
          if(!$info) return null;
          
          $template = $GLOBALS['xmlparser']->FindTag($info, 'template');
          if(!$template) return null;
          if(count($template['children']) != 1) return;
          if(!is_string($template['children'][0])) return;
          $template = $template['children'][0];
          
          $access = $GLOBALS['xmlparser']->FindTag($info, 'access');
          if(!$access) return null;
          if(count($access['children']) != 1) return;
          if(!is_string($access['children'][0])) return;
          $access = explode(':', $access['children'][0]);
          
          $rawdata = $GLOBALS['xmlparser']->FindTag($xmldata, 'data');
          
          $data = array();
          
          foreach($rawdata['children'] as $field) {
            if(!is_array($field)) continue;
            if(count($field['children']) != 1) continue;
            
            $data[$field['tag']] = $field['children'][0];
          }
          
          $this->pages[$page] = array('name' => $page, 'template' => $template,
                                                    'access' => $access, 'data' => $data);
        }
        
        $res = $GLOBALS['db']->Execute('SELECT readaccess, writeaccess FROM privs WHERE name = ?', $page);
      
        if($res->RecordCount())
          $this->pages[$page]['access'] = array($res->fields[0], $res->fields[1]);
      }
      
      return $this->pages[$page];
    }
    
    function Add($name, $template) {
      if($this->Exists($name)) return false;
      
      $GLOBALS['db']->Execute('INSERT INTO pages (name, template, data) VALUES (?, ?, "")',
                              array($name, $template));
      
      return ($GLOBALS['db']->Affected_Rows() > 0);
    }
    
    function Edit($page, $data) {
      $string = '';
      
      foreach($data as $key => $val)
        $string .= urlencode($key) . '=' . urlencode($val) . '&';
      
      $res = $GLOBALS['db']->Execute('SELECT id FROM pages WHERE name = ?', $page);
      
      if($res->RecordCount()) {
        $GLOBALS['db']->Execute('UPDATE pages SET data = ? WHERE name = ?',
                              array(substr($string, 0, -1), $page));
      
        return true;
      }
      
      $pagedata = $this->GetPageData($page);
      
      $GLOBALS['db']->Execute('INSERT INTO privs (name, readaccess, writeaccess) VALUES (?, ?, ?)',
                              array($page, $pagedata['access'][0], $pagedata['access'][1]));
      $GLOBALS['db']->Execute('INSERT INTO pages (name, template, data) VALUES (?, ?, ?)',
                              array($page, $pagedata['template'], $string));
      
      return ($GLOBALS['db']->Affected_Rows() > 0);
    }
    
    function Rename($page, $new_name) {
      if($this->Exists($new_name)) return false;
      if(!$this->Exists($page)) return false;
      
      $GLOBALS['db']->Execute('UPDATE privs SET name = ? WHERE name = ?', array($new_name, $page));
      $GLOBALS['db']->Execute('UPDATE pages SET name = ? WHERE name = ?', array($new_name, $page));
      
      return ($GLOBALS['db']->Affected_Rows() > 0);
    }
    
    function Copy($page, $new_name) {
      if($this->Exists($new_name)) return false;
      if(!$this->Exists($page)) return false;
      
      $pagedata = $this->GetPageData($page);
      
      $string = '';
      
      foreach($pagedata['data'] as $key => $val)
        $string .= urlencode($key) . '=' . urlencode($val) . '&';
      
      $GLOBALS['db']->Execute('INSERT INTO pages (name, template, data) VALUES (?, ?, ?)',
                              array($new_name, $pagedata['template'], $string));
      
      return ($GLOBALS['db']->Affected_Rows() > 0);
    }
    
    function Delete($page) {
      $GLOBALS['db']->Execute('DELETE FROM privs WHERE name = ?', $page);
      $GLOBALS['db']->Execute('DELETE FROM pages WHERE name = ?', $page);
      
      return ($GLOBALS['db']->Affected_Rows() > 0);
    }
    
    function GetList() {
      $res = $GLOBALS['db']->Execute('SELECT name FROM pages');
      
      $pages = array();
      
      while($row = $res->FetchRow())
        $pages[$row[0]] = null;
      
      $pages = array_keys(array_merge($pages, $this->pages, $GLOBALS['modules']->pages));
      
      sort($pages);
      
      return $pages;
    }
    
    function GetAccess($page) {
      $res = $GLOBALS['db']->Execute('SELECT readaccess, writeaccess FROM privs WHERE name = ?', $page);
      
      if($res->RecordCount())
        return array($res->fields[0], $res->fields[1]);
      
      $pagedata = $this->GetPageData($page);
      
      return $pagedata['access'];
    }
    
    function SetAccess($page, $access) {
      $res = $GLOBALS['db']->Execute('SELECT id FROM privs WHERE name = ?', $page);
      
      if($res->RecordCount()) {
        $GLOBALS['db']->Execute('UPDATE privs SET readaccess = ?, writeaccess = ? WHERE name = ?', array($access[0], $access[1], $page));
      
        return ($GLOBALS['db']->Affected_Rows() > 0);
      }
      
      $GLOBALS['db']->Execute('INSERT INTO privs (name, readaccess, writeaccess) VALUES (?, ?, ?)', array($page, $access[0], $access[1]));
      
      return ($GLOBALS['db']->Affected_Rows() > 0);
    }
  }
  
  $GLOBALS['pages'] = new Pages;
?>