<?php

class NewsVisualizer
{
  var $flickr;
  var $feedUrl;
  var $rss;
  var $maxPhotos = 6;
  var $maxStories = 5;

  // Constructor	
  function NewsVisualizer($feedUrl)
  {
    global $flickrApiKey;
    global $flickrApiSecret;

    $this->flickr = new phpFlickr($flickrApiKey, $flickrApiSecret, false);
    $this->feedUrl = $feedUrl;
    $this->rss = fetch_rss($this->feedUrl);
  }

  function getTitle()
  {
    return $this->rss->channel['title'];
  }

  function getDescription()
  {
    return $this->rss->channel['description'];
  }

  function getLink()
  {
    return $this->rss->channel['link'];
  }

  function getItems()
  {
    $items = array();

    foreach ($this->rss->items as $item)
    {
      $newsItem = new NewsItem($item);
      $photos = $this->findImages($newsItem->getKeywords());

      $photoCount = 0;
      foreach ($photos as $photo)
      {
        $squarePhoto = 'http://static.flickr.com/' . $photo['server'] 
          . '/' . $photo['id'] . '_' .$photo['secret'] . '_s.jpg';
        $photoPage = 'http://www.flickr.com/photos/' . $photo['owner'] 
          . '/' . $photo['id'] . '/';
        $newsItem->addPhoto($squarePhoto, $photoPage);
        if (++$photoCount >= $this->maxPhotos)
        {
          break;
        }
      }

      array_push($items, $newsItem);

      if (count($items) >= $this->maxStories)
      {
        break;
      }
    }
   return $items;
  }

  function findImages($keywords)
 {
   $args = array(
      'tags' => join($keywords, ','),
      'tag_mode' => 'any',
      'sort' => 'relevance', 
      'page' => 1, 
      'per_page' => $this->maxPhotos,
     );

    $photos = $this->flickr->photos_search($args);

    if ($this->flickr->getErrorCode())
    {
      // Display error message and return an empty set of photos
      echo $this->flickr->getErrorMsg() . " whilst searching for photos";
      return array();
    }

    return $photos['photo'];
  }
}
?>