<?php

/**
 * Posts (popular, recent etc.)
 * Differences to the "Recent Posts" widget:
 *  + Template system
 *  + Post types
 *  + Other order attributes besides 'recent'
 *  + Category selection
 *  + Show additional content: thumbnails, author, date, comment count etc.
 *  + Limit word count in content
 *  + Retrieve more entries via ajax
 *
 * @since 1.0
 * @todo add 'meta_value' option to the 'order by' field
 */

unregister_widget('WP_Widget_Recent_Posts');
register_widget('atom_widget_posts');
 
class atom_widget_posts extends WP_Widget{

  function atom_widget_posts(){
    $widget_ops = array('classname' => 'posts', 'description' => _a('List posts based on filters you choose'));
    $control_ops = array('width' => 500);
    $this->WP_Widget('atom-posts', _a('Posts'), $widget_ops, $control_ops);

    atom_add('ajax_requests', array(&$this, 'ajax'));

    // register thumbnail size
    atom_add('set_thumb_sizes', array(&$this, 'set_thumb_size'));

    // include in jQuery(document).ready()
    atom_add('jquery_init', array(&$this, 'js'));

    // flush cache when posts are changed
    add_action('save_post', array(&$this, 'flush_cache'));
    add_action('deleted_post', array(&$this, 'flush_cache'));
    add_action('switch_theme', array(&$this, 'flush_cache'));
  }

  function set_thumb_size($sizes){
    // 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}";

      // register thumb size if the widget is active
      if(is_active_widget(false, $id, $this->id_base))
        add_image_size($id, $options['thumb_size'], $options['thumb_size'], true);

    endforeach;
    return $sizes;
  }

  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 (isset($options['more']) && $options['more'] && is_active_widget(false, $id, $this->id_base)): ?>

      $("#<?php echo $block_id; ?> a.more").click(function(event){
        event.preventDefault();

        $.ajax({
          type: "GET",
          url: "<?php echo home_url(); ?>",
          data: { instance: <?php echo $instance; ?>,
                  offset: parseInt($(this).attr('rel')),
                  _ajax_nonce: "<?php atom_nonce('get_posts'); ?>",
                  atom: 'get_posts' },
          dataType: 'json',
          context: this,
          error: function(e, m, d) {alert(d); },
          beforeSend: function() { $(this).addClass("loading"); },
          complete: function() { $(this).removeClass("loading"); },
          success: function(response){
            var link = $(this);

            // append to list & update tab container height (if we're inside a tabbed widget)
            if(response.output != '')
              $(response.output).appendTo("#<?php echo $block_id; ?> ul").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){
                      link.parents('li.block .sections').height((link.parents('#<?php echo $block_id; ?>').height()) + 5);
                    }
                 });
              });

            link.attr('rel', response.offset);

            // no more data?
            if(!response.more) link.hide();
          }
        });
      });

      <?php endif;
    endforeach;
  }

  function ajax(){

    if(atom_ajax_request('get_posts')):
      atom_ajax_header('get_posts', 'application/json');

      $settings = atom_get_options($this->option_name);
      $instance = intval($_GET['instance']);
      $settings = $settings[$instance];

      // ID needed to identify post thumbnail size
      $settings['id'] = "{$this->id_base}-{$instance}";

      $offset = intval($_GET['offset']);

      $output = $this->get_posts($settings, $next, $offset);
      $offset = $offset + $settings['number'];

      echo json_encode(array('output' => $output, 'more' => $next, 'offset' => $offset));
      exit();
    endif;
  }

  function flush_cache(){
    wp_cache_delete('widget_posts', 'widget');
  }

  function template($mode = 'full'){
    switch($mode):
      case 'full':
        return "<a class=\"fadeThis clear-block\" href=\"{URL}\" title=\"{TITLE}\">\n"
              ." {THUMBNAIL}\n"
              ." <span class=\"base\">\n"
              ."   <span class=\"tt\">{TITLE} ({COMMENT_COUNT})</span>\n"
              ."   <span class=\"c1\">{CONTENT}</span>\n"
              ."   <span class=\"c2\">{DATE}</span>\n"
              ." </span>\n"
              ."</a>\n";
        break;
      case 'images':
        return "<a class=\"fadeThis clear-block\" href=\"{URL}\" title=\"{TITLE}\">\n"
              ." {THUMBNAIL}\n"
              ."</a>\n";
        break;
      case 'brief':
        return "<a class=\"fadeThis clear-block\" href=\"{URL}\" title=\"{TITLE}\">\n"
              ." <span class=\"base\">\n"
              ."   <span class=\"tt\">{TITLE} ({COMMENT_COUNT})</span>\n"
              ." </span>\n"
              ."</a>\n";
        break;
      case 'detailed':
        return "<a class=\"fadeThis clear-block\" href=\"{URL}\" title=\"{TITLE}\">\n"
              ." <span class=\"base\">\n"
              ."   <span class=\"tt\">{TITLE} ({COMMENT_COUNT})</span>\n"
              ."   <span class=\"c1\">{CONTENT}</span>\n"
              ."   <span class=\"c2\">{DATE}</span>\n"
              ." </span>\n"
              ."</a>\n";
        break;

    endswitch;
  }

  function get_posts($args, &$more, $offset = 0){
    global $post;

    extract($args);

    // build query, we get the number of posts + 1 just to check if more posts are available
    $query = array('orderby' => $order_by, 'post_type' => $post_type, 'caller_get_posts' => 1, 'posts_per_page' => $number+1, 'offset' => $offset);

    if($category != 0) $query['cat'] = $category;

    // exclude current post if we're on the single page
    if(is_single()) $query['post__not_in'] = array($post->ID);

    if($related && is_single()): // tag-related posts ?
      $tags = wp_get_post_tags($post->ID);
      if(!empty($tags)):
        $tag_ids = array();
        foreach($tags as $tag) $tag_ids[] = $tag->term_id;
        $query['tag__in'] = $tag_ids;
      else:
        return false; // no tags = no related posts
      endif;
    elseif($related):
      return false; // not a single page
    endif;

    $posts = new WP_Query();
	$posts->query($query);

    /*/ site-wide posts -- @todo
    global $wpdb;
    foreach (atom_get_sites(array('limit_results' => $number)) as $blog)
      $selects[] = "(SELECT ID, post_date_gmt, {$blog['blog_id']} AS blog_id FROM ".$wpdb->get_blog_prefix($blog['blog_id'])."posts
        WHERE post_status = 'publish'
          AND post_type = 'post'
         ORDER BY post_date_gmt DESC LIMIT {$number})"; // real number is (number * # of blogs)

    $p = $wpdb->get_results(implode(" UNION ALL ", $selects)." ORDER BY post_date_gmt DESC", ARRAY_A);
    foreach($p as $post):
      $data = get_blog_post($post["blog_id"], $post["ID"]);
      echo $data->post_title,"<br/>";
      echo atom_time_since(abs(strtotime($data->post_date_gmt)));
    endforeach;
    echo $posts->found_posts;
    //*/

    // do we have more results?
    $more = ($posts->post_count > $number) ? true : false;

    $output = '';
    $count = 0;
    if($mode == 'template') $template = $args['template']; else $template = $this->template($mode);

    // output posts, minus the last one
    while($posts->have_posts() && ($posts->current_post < $number-1)):

      $posts->the_post();
      $count++;

      $output .= '<li'.($count == 1 && $offset == 0 ? ' class="first"' : NULL).'>';
      $categories = get_the_category();

      // output template
      $output .= atom_render_template($template, array(
        'TITLE' => atom_get_post_title(),
        'COMMENT_COUNT' => $post->comment_count,
        'THUMBNAIL' => atom_get_post_thumb($post->ID, str_replace('instance-', '', $id)),
        'URL' => atom_get_post_title_url(),
        'CONTENT' => convert_smilies(atom_filter_content(NULL, array(
           'limit' => $word_count,
           'allowed_tags' => explode(',', $allowed_tags),
           'more' => $content_filter_more,
          ))),
        'EXCERPT' => get_the_excerpt(),
        'DATE' => atom_get_post_date(),
        'AUTHOR' => esc_attr(get_the_author()), // not used by default
        'CATEGORY' => isset($categories[0]->name) ? $categories[0]->name : '', // not used by default
        'INDEX' => $posts->current_post+1, // number
        'ID' => $post->ID, // not used by default
       ));

      $output .= '</li>';
    endwhile;
    wp_reset_query();

    return $output;
  }

  function widget($args, $instance){

    $cache = wp_cache_get('widget_posts', 'widget');
    if (!is_array($cache)) $cache = array();
    if (isset($cache[$args['widget_id']])):
      echo $cache[$args['widget_id']];
      return;
    endif;

    $instance = wp_parse_args($instance, $this->defaults());
    $instance['id'] = $this->id;

    extract($args, EXTR_SKIP);

    $posts = $this->get_posts($instance, $next);
    if(!$posts) return atom_add_debug_message("No ".($instance['related'] ? 'related posts' : 'relevant entries')." were found in {$args['widget_id']} ({$args['widget_name']}). Widget marked as inactive");

    $title = apply_filters('widget_title', $instance['title'], $instance, $this->id_base);

    $output = $before_widget;
    if ($title) $output .= $before_title.$title.$after_title;

    $id = "instance-{$this->id}";

    $output .= "<ul class=\"menu clear-block {$instance['mode']}\">{$posts}</ul>";
    if($instance['more'] && $next && atom_get_options('jquery'))
      $output .= "<a href=\"#\" class=\"fadeThis more\" rel=\"{$instance['number']}\">"._a("Show More")."</a>";

    $output .= $after_widget;
    echo $output;

    if($instance['order_by'] != 'rand'): // we can't cache random posts (they wouldn't be random :)
      $cache[$args['widget_id']] = $output;
      wp_cache_set('widget_posts', $cache, 'widget');
    endif;
  }

  function update($new_instance, $old_instance){
    $instance = $old_instance;
    $instance['title'] = esc_attr($new_instance['title']);
    $instance['post_type'] = esc_attr($new_instance['post_type']);
    $instance['mode'] = esc_attr($new_instance['mode']);
    $instance['category'] = intval($new_instance['category']);
    $instance['order_by'] = esc_attr($new_instance['order_by']);
    $instance['number'] = min(max(intval($new_instance['number']), 1), 20);
    $instance['word_count'] = intval($new_instance['word_count']);
    $instance['thumb_size'] = intval($new_instance['thumb_size']);
    $instance['more'] = (bool)$new_instance['more'];
    $instance['related'] = (bool)$new_instance['related'];

    // html template
    if(isset($new_instance['template']) && current_user_can('edit_themes')) $instance['template'] = $new_instance['template'];

    $this->flush_cache();
    return wp_parse_args($instance, $this->defaults());
  }

  function defaults(){
    // default settings
    return apply_filters('atom_widget_posts_defaults', array(
      'title' => _a("Recent Posts"),
      'post_type' => 'post',
      'mode' => 'full',
      'order_by' => 'date',
      'category' => 0,
      'number' => 5,
      'word_count' => 20,
      'thumb_size' => 48,
      'more' => true,
      'related' => false,
      'template' => $this->template('full'),

      // internal settings (not worth adding forms for this)
      'allowed_tags' => 'abbr,acronym,b,cite,code,del,dfn,em,i,ins,q,strong,sub,sup',
      'content_filter_more' => '[&hellip;]',
    ), $this);
  }

  function form($instance){
    $instance = wp_parse_args($instance, $this->defaults());
    ?>
    <div <?php atom_widget_form_class($this); ?>>
    <div class="clear-block">
    <div class="section alignleft">
    <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 $this->get_field_name('title'); ?>" type="text" value="<?php if (isset($instance['title'])) echo esc_attr($instance['title']); ?>" />
    </p>

    <p>
     <label for="<?php echo $this->get_field_id('post_type'); ?>"><?php _ae('Post Type:'); ?></label>
     <select id="<?php echo $this->get_field_id('post_type'); ?>" name="<?php echo $this->get_field_name('post_type'); ?>" class="widefat" followRules>
       <?php
        global $wp_post_types;
        foreach($wp_post_types as $post_type_name => $post_type_data):
         if($post_type_data->public): ?>
         <option value="<?php echo esc_attr($post_type_name); ?>" <?php selected($instance['post_type'], $post_type_name); ?>><?php echo $post_type_data->label; ?></option> <?php
         endif;
        endforeach; ?>
     </select>
    </p>

    <p>
      <label for="<?php echo $this->get_field_id('order_by'); ?>"><?php _ae('Order by:') ?></label>
      <select class="widefat" id="<?php echo $this->get_field_id('order_by'); ?>" name="<?php echo $this->get_field_name('order_by'); ?>">
       <option value="date" <?php selected($instance['order_by'], "date"); ?>><?php _ae("Date (Recent posts)"); ?></option>
       <option value="modified" <?php selected($instance['order_by'], "modified"); ?>><?php _ae("Modified date (Recently modified)"); ?></option>
       <option value="comment_count" <?php selected($instance['order_by'], "comment_count"); ?>><?php _ae("Comment count (Popular posts)"); ?></option>
       <option value="title" <?php selected($instance['order_by'], "title"); ?>><?php _ae("Title, alphabetically"); ?></option>
       <option value="rand" <?php selected($instance['order_by'], "rand"); ?>><?php _ae("Nothing, get random posts"); ?></option>
       <option value="meta" disabled="disabled"><?php _ae("Custom Field Value (Meta)"); ?></option>
      </select>
    </p>

    <?php
      $categories = atom_dropdown_terms(array(
        'name' => $this->get_field_name('category'),
        'id' => $this->get_field_id('category'),
        'selected' => intval($instance['category']),
        'show_option_all' => _a('-- All categories --'),
        'hide_empty' => 0,
        'orderby' => 'name',
        'show_count' => 1,
        'echo' => 0,
        'class' => 'widefat',
        'hierarchical' => 1,
        'extra_attributes' => 'followRules rules="DEPENDS ON '.$this->get_field_name('post_type').' BEING post"',
      ));
    ?>
    <p>
      <label for="<?php echo $this->get_field_id('category'); ?>"><?php _ae('Show only posts from:') ?></label>
      <?php echo $categories; ?>
    </p>

    <div class="high-priority-block">
     <p>
      <label for="<?php echo $this->get_field_id('mode'); ?>"><strong><?php _ae('Display mode:') ?></strong></label>
      <select class="widefat" id="<?php echo $this->get_field_id('mode'); ?>" name="<?php echo $this->get_field_name('mode'); ?>" followRules>
       <option value="images" <?php selected($instance['mode'], "images"); ?>><?php _ae("Thumbnails only"); ?></option>
       <option value="brief" <?php selected($instance['mode'], "brief"); ?>><?php _ae("Post titles only"); ?></option>
       <option value="detailed" <?php selected($instance['mode'], "detailed"); ?>><?php _ae("Detailed Info"); ?></option>
       <option value="full" <?php selected($instance['mode'], "full"); ?>><?php _ae("Detailed Info &amp; Thumbnails"); ?></option>
       <?php if(current_user_can('edit_themes')): ?>
       <option value="template" <?php selected($instance['mode'], "template"); ?>><?php _ae("Advanced, use template below"); ?></option>
       <?php endif; ?>
      </select>
     </p>
    </div>

    </div>

    <div class="section alignright">
    <p>
     <label for="<?php echo $this->get_field_id('number'); ?>"><?php _ae('How many entries to display?'); ?></label><br />
     <input id="<?php echo $this->get_field_id('number'); ?>" name="<?php echo $this->get_field_name('number'); ?>" type="text" value="<?php if (isset($instance['number'])) echo intval($instance['number']); ?>" size="3" />
    </p>

    <p>
     <?php $input = '<br /><input id="'.$this->get_field_id('word_count').'" name="'.$this->get_field_name('word_count').'" type="text" value="'.(isset($instance['word_count']) ? intval($instance['word_count']) : null).'" size="3" />'; ?>
     <label for="<?php echo $this->get_field_id('word_count'); ?>"><?php printf(_a('Content has max %s <em>words</em>'), $input); ?></label>
    </p>

    <p>
      <label for="<?php echo $this->get_field_id('thumb_size'); ?>"><?php _ae('Thumbnail Size:') ?></label><br />
      <input type="text" size="3" id="<?php echo $this->get_field_id('thumb_size'); ?>" name="<?php echo $this->get_field_name('thumb_size'); ?>" value="<?php if (isset($instance['thumb_size'])) echo intval($instance['thumb_size']); ?>" /> <em><?php _ae("pixels"); ?></em>
    </p>

    <p>
     <input <?php if(!atom_get_options('jquery')) echo "disabled=\"disabled\""; ?> type="checkbox" id="<?php echo $this->get_field_id('more'); ?>" name="<?php echo $this->get_field_name('more'); ?>"<?php checked($instance['more']); ?> />
     <label for="<?php echo $this->get_field_id('more'); ?>" <?php if(!atom_get_options('jquery')) echo "class=\"disabled\""; ?>><?php printf(_a('Display %s Link'), '<code>'._a("Show More").'</code>'); ?></label>
    </p>

    <p>
     <input type="checkbox" id="<?php echo $this->get_field_id('related'); ?>" name="<?php echo $this->get_field_name('related'); ?>"<?php checked($instance['related']); ?> followRules rules="DEPENDS ON <?php echo $this->get_field_name('post_type'); ?> BEING post" />
     <label for="<?php echo $this->get_field_id('related'); ?>"><?php _ae('Show only related posts'); ?></label>
    </p>
    </div>
    </div>

    <?php if(current_user_can('edit_themes')): ?>
    <div class="high-priority-block">
      <p>
      <label for="<?php echo $this->get_field_id('template'); ?>"><strong><?php _ae('Entry Template (HTML):'); ?></strong></label>
      <input type="hidden" name="<?php echo $this->get_field_name('template'); ?>" value="<?php if (isset($instance['template'])) echo format_to_edit($instance['template']); ?>" />
      <textarea followRules rules="DEPENDS ON <?php echo $this->get_field_name('mode'); ?> BEING template" class="widefat code" id="<?php echo $this->get_field_id('template'); ?>" name="<?php echo $this->get_field_name('template'); ?>" rows="8" cols="28"><?php if (isset($instance['template'])) echo format_to_edit($instance['template']); ?></textarea>
      </p>
    </div>
    <?php endif; ?>

    <hr />
    <p>
      <em>
        <?php
          printf(_a('<strong>Important:</strong> %1$s sized thumbnails have to be created if you just added this widget, or if you\'re changing the thumbnail size. Read more about thumbnail sizes %2$s'),  intval($instance['thumb_size']).'x'.intval($instance['thumb_size']), '<a href="'.admin_url('admin.php?page='.ATOM.'_advanced').'">'._a("here").'</a>'); ?>
      </em>
    </p>
    </div>
  <?php
  }
}