<?php

/**
 * Twitter updates
 *
 * @since 1.0
 * @todo maybe add 'show more' functionality; might be useless because of the 20 tweet limit
 * @todo add a REAL cache system
 */
 
register_widget('atom_widget_twitter');  
 
class atom_widget_twitter extends WP_Widget{

  function atom_widget_twitter(){
    $widget_ops = array('classname' => 'twitter', 'description' => _a("Your latest Twitter updates"));
    $this->WP_Widget('atom-twitter', _a('Twitter'), $widget_ops);

    atom_add('ajax_requests', array(&$this, 'ajax'));

    // include in jQuery(document).ready()
    atom_add('jquery_init', array(&$this, 'js'));
  }

  function ajax(){
    if(atom_ajax_request('get_twitter_data')):
      atom_ajax_header('get_twitter_data');
      $this->display_tweets(esc_attr($_GET['widget_id']), esc_attr(($_GET['twituser'])), intval($_GET['twitcount']), false, $_GET['showinfo']);
      exit();
    endif;
  }

  function js(){
    // we need to process all instances because this function gets to run only once
    $widget_settings = atom_get_options($this->option_name);

    foreach((array)$widget_settings as $instance => $options):

      // identify instance
      $id = "{$this->id_base}-{$instance}";
      $block_id = "instance-{$id}";

      if (false === ($data = get_transient($block_id)) && is_active_widget(false, $id, $this->id_base)): ?>

        $.ajax({
          type: "GET",
          url: "<?php echo home_url(); ?>",
          data: { widget_id: '<?php echo $block_id; ?>',
                  twituser: '<?php echo $options['user']; ?>',
                  twitcount: <?php echo $options['count']; ?>,
                  showinfo: <?php echo $options['info']; ?>,
                  _ajax_nonce: "<?php echo wp_create_nonce('atom_get_twitter_data'); ?>",
                  atom: 'get_twitter_data'
                },
          beforeSend: function() { },
          complete: function() { },
          success: function(response){
            var block = $('#<?php echo $block_id; ?>');
            $('.latest-tweets', block).html(response);

            // animate list
            $('.latest-tweets li', block).hide().each(function(i){
               $(this).delay(333*i).animate(
                  {
                    "opacity": "show",
                    "height": "show",
                    "marginTop": "show",
                    "marginBottom": "show",
                    "paddingTop": "show",
                    "paddingBottom": "show"
                  },
                  { duration: 333,
                    step: function(now, fx){
                    $('.latest-tweets', block).parents('li.block .sections').height((block.height()) + 5);
                  }
               });
            });

          }
        });

      <?php endif;
    endforeach;
  }

  function display_tweets($id, $user, $count, $data = false, $showinfo = true, $cache = 90){
    $error = false;
    if(!$data):
      if (false === ($data = get_transient($id))):
        if($showinfo):
          $response = wp_remote_retrieve_body(wp_remote_request("http://twitter.com/users/show/".$user.".json"));
          if(!is_array($userdata = json_decode($response, true))) $error = true;
        endif;
        $response = wp_remote_retrieve_body(wp_remote_request("http://twitter.com/statuses/user_timeline/".$user.".json"));
        if(!is_array($tweets = json_decode($response, true))) $error = true;

        if(!$error):
          if(isset($tweets['error'])):
            $error = esc_attr($tweets['error']);
          else:
            $data = array();
            if($showinfo):
              $data['user']['profile_image_url'] = esc_url($userdata['profile_image_url']);
              $data['user']['name'] = esc_attr($userdata['name']);
              $data['user']['screen_name'] = esc_attr($userdata['screen_name']);
              $data['user']['followers_count'] = intval($userdata['followers_count']);
              $data['user']['statuses_count'] = intval($userdata['statuses_count']);
              $data['user']['description'] = esc_attr($userdata['description']);
            endif;

            $i = 0;
            foreach($tweets as $tweet):
              $data['tweets'][$i]['text'] = esc_attr($tweet['text']);
              $data['tweets'][$i]['created_at'] = esc_attr($tweet['created_at']);
              $data['tweets'][$i]['id'] = esc_attr($tweet['id']);
              $i++;
            endforeach;
            set_transient($id, $data, intval($cache)); // keep the data cached

          endif;
        endif;
      endif;
    endif;

    if(!$error && is_array($data['tweets'])): ?>
     <?php if($showinfo): ?>
     <div class="info box clear-block">
       <div class="avatar"><img width="48" height="48" src="<?php echo $data['user']['profile_image_url']; ?>" alt="<?php echo $data['user']['name']; ?>" /></div>
       <div class="details">
         <a href="http://www.twitter.com/<?php echo $user; ?>/" title="<?php echo $data['user']['description']; ?>"><?php echo $data['user']['name']; ?> </a>
         <span class="followers"> <?php printf(_a("%s followers"),$data['user']['followers_count']); ?></span>
         <span class="count"> <?php printf(_a("%s tweets"),$data['user']['statuses_count']); ?></span>
       </div>
     </div>
     <?php endif; ?>
     <ul class="tweets box">
      <?php
        $i = 0;
        foreach($data['tweets'] as $tweet):
          $i++;
          $pattern = '/\@(\w+)/';
          $replace = '<a rel="nofollow" href="http://twitter.com/$1">@$1</a>';
          $tweet['text'] = preg_replace($pattern, $replace, $tweet['text']);
          $tweet['text'] = convert_smilies(make_clickable($tweet['text']));

          // remove +XXXX
          $tweettime = substr_replace($tweet['created_at'], '', strpos($tweet['created_at'],"+"), 5);

          $link = "http://twitter.com/".$user."/statuses/".$tweet['id'];
          echo '<li class="entry '.($i == 1 ? 'first' : null).'">'.$tweet['text'].'<a class="date" href="'.$link.'" rel="nofollow">'.atom_time_since(abs(strtotime("{$tweettime} GMT"))).'</a></li>';
          if ($i == $count) break;
        endforeach;
      ?>
     </ul>

    <?php else:
      if(current_user_can('edit_theme_options')):
        echo '<div class="box error">';
        if(is_string($error)) printf(_a("Twitter returned error: %s"), $error);
        else _ae("Could not retrieve tweets.");
        echo '</div>';

        if(!is_string($error)):
          echo '<p>'._a("Possible reasons:").'</p>';
          echo '<ul>';
          echo '<li>'._a("Your host doesn't allow outgoing connections").'</li>';
          echo '<li>'._a("Your server has made too many requests and is being limited (try increasing the cache value)").'</li>';
          echo '<li>'._a("The user has protected his/her tweets").'</li>';
          echo '<li>'._a("Twitter may be down").'</li>';
          echo '</ul';
        endif;
      else:
        echo '<div class="box"><em>'._a("Unavailable for the moment").'</em></div>';
      endif;
    endif;
  }

  function widget($args, $instance){
    extract($args);
    $instance = wp_parse_args($instance, $this->defaults());

    $title = apply_filters('widget_title', $instance['title'], $instance, $this->id_base);
    $user = esc_attr($instance['user']);
    $count = intval($instance['count']);

    $id = "instance-{$this->id}";

    echo $before_widget;
    if ($title) echo $before_title.$title.$after_title;

    echo '<div class="latest-tweets">';

    if(atom_get_options('jquery')):
      if (false === ($data = get_transient($id))):
        echo '<div class="box loading">'._a("Loading tweets...").'</div>';
      else:
        $this->display_tweets($id, $user, $count, $data, $instance['info'], intval($instance['cache']));
      endif;
    else:
      echo '<div class="box error">'._a("jQuery is required by this widget").'</div>';
   endif;

    echo '</div>';
    echo $after_widget;
  }

  function update($new_instance, $old_instance){
    $instance = $old_instance;
    $instance['title'] = esc_attr($new_instance['title']);
    $instance['user'] = esc_attr($new_instance['user']);
    $instance['count'] = min(max(intval($new_instance['count']), 1), 20);

    $instance['info'] = (bool)$new_instance['info'];
    $instance['cache'] = intval($new_instance['cache']);

    delete_transient("instance-".$this->id);
    return wp_parse_args($instance, $this->defaults());
  }

  function defaults(){
    // default settings
    return apply_filters('atom_widget_twitter_defaults', array(
      'title' => _a('My latest tweets'),
      'user' => 'tweetnorris',
      'count' => 4,
      'info' => true,
      'cache' => 90,
    ), $this);
  }

  function form($instance){
    $instance = wp_parse_args($instance, $this->defaults());
    ?>
    <div <?php atom_widget_form_class($this); ?>>
    <p>
     <label for="<?php echo $this->get_field_id('title'); ?>"> <?php _ae('Title:'); ?></label>
     <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr($instance['title']); ?>" />
    </p>

    <p>
     <label for="<?php echo $this->get_field_id('user'); ?>"><?php  printf(_a('%s user name:'), 'Twitter'); ?></label>
     <input class="widefat" id="<?php echo $this->get_field_id('user'); ?>" name="<?php echo $this->get_field_name('user'); ?>" type="text" value="<?php echo esc_attr($instance['user']); ?>" />
    </p>

    <p>
     <label for="<?php echo $this->get_field_id('count'); ?>"><?php _ae('How many entries to display?'); ?></label>
     <input size="3" id="<?php echo $this->get_field_id('count'); ?>" name="<?php echo $this->get_field_name('count'); ?>" type="text" value="<?php echo esc_attr($instance['count']); ?>" />
    </p>

    <p>
     <label for="<?php echo $this->get_field_id('info'); ?>">
     <input type="checkbox" id="<?php echo $this->get_field_id('info'); ?>" name="<?php echo $this->get_field_name('info'); ?>"<?php checked($instance['info']); ?> />
 	   <?php _ae('Show profile info'); ?></label>
    </p>

    <p>
      <label for="<?php echo $this->get_field_id('cache'); ?>"><?php _ae('Keep data cached for:') ?></label>
      <select id="<?php echo $this->get_field_id('cache'); ?>" name="<?php echo $this->get_field_name('cache'); ?>">
       <option value="60" <?php selected($instance['cache'], "60"); ?>><?php _ae("60 seconds"); ?></option>
       <option value="90" <?php selected($instance['cache'], "90"); ?>><?php _ae("90 seconds"); ?></option>
       <option value="120" <?php selected($instance['cache'], "120"); ?>><?php _ae("2 minutes"); ?></option>
       <option value="300" <?php selected($instance['cache'], "300"); ?>><?php _ae("5 minutes"); ?></option>
      </select>
    </p>
    </div>
    <?php
  }
}