<?php
/**
* Gallery content filters
*
* 
* @package      Customizr
* @subpackage   classes
* @since        3.0.5
* @author       Nicolas GUILLAUME <nicolas@themesandco.com>
* @copyright    Copyright (c) 2013, Nicolas GUILLAUME
* @link         http://themesandco.com/customizr
* @license      http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*/
if ( ! class_exists( 'TC_gallery' ) ) :
  class TC_gallery {
      static $instance;
      function __construct () {
        self::$instance =& $this;
        //adds a filter allowing lightbox navigation in galleries
        add_filter ( 'post_gallery'                   , array( $this , 'tc_fancybox_gallery_filter' ), 20, 2);
        //adds a filter for link markup (allow lightbox)
        add_filter ( 'wp_get_attachment_link'         , array($this, 'tc_modify_attachment_link') , 20, 6 );
      }


      /**
       * Gallery filter to enable lightbox navigation (based on the WP original gallery function)
       * 
       * @package Customizr
       * @since Customizr 3.0.5
       */
      function tc_fancybox_gallery_filter( $output, $attr) {

          if( ! apply_filters( 'tc_gallery_bool', true ) )
            return $output;
          
          
          //add a filter for link markup 
          //add_filter( 'wp_get_attachment_link', array($this, 'tc_modify_attachment_link') , 20, 6 );

          //COPY OF WP FUNCTION IN media.php
          $post = get_post();

          static $instance = 0;
          $instance++;

          // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
          if ( isset( $attr['orderby'] ) ) {
            $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
            if ( !$attr['orderby'] )
              unset( $attr['orderby'] );
          }

          extract(shortcode_atts(array(
            'order'      => 'ASC',
            'orderby'    => 'menu_order ID',
            'id'         => $post->ID,
            'itemtag'    => 'dl',
            'icontag'    => 'dt',
            'captiontag' => 'dd',
            'columns'    => 3,
            'size'       => 'thumbnail',
            'include'    => '',
            'exclude'    => ''
          ), $attr));

          $id = intval($id);
          if ( 'RAND' == $order )
            $orderby = 'none';

          if ( !empty($include) ) {
            $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

            $attachments = array();
            foreach ( $_attachments as $key => $val ) {
              $attachments[$val->ID] = $_attachments[$key];
            }
          } elseif ( !empty($exclude) ) {
            $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
          } else {
            $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
          }

          if ( empty($attachments) )
            return '';

          if ( is_feed() ) {
            $output = "\n";
            foreach ( $attachments as $att_id => $attachment )
              $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
            return $output;
          }

          $itemtag = tag_escape($itemtag);
          $captiontag = tag_escape($captiontag);
          $icontag = tag_escape($icontag);
          $valid_tags = wp_kses_allowed_html( 'post' );
          if ( ! isset( $valid_tags[ $itemtag ] ) )
            $itemtag = 'dl';
          if ( ! isset( $valid_tags[ $captiontag ] ) )
            $captiontag = 'dd';
          if ( ! isset( $valid_tags[ $icontag ] ) )
            $icontag = 'dt';

          $columns = intval($columns);
          $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
          $float = is_rtl() ? 'right' : 'left';

          $selector = "gallery-{$instance}";

          $gallery_style = $gallery_div = '';
          if ( apply_filters( 'use_default_gallery_style', true ) )
            $gallery_style = "
            <style type='text/css'>
              #{$selector} {
                margin: auto;
              }
              #{$selector} .gallery-item {
                float: {$float};
                margin-top: 10px;
                text-align: center;
                width: {$itemwidth}%;
              }
              #{$selector} img {
                border: 2px solid #cfcfcf;
              }
              #{$selector} .gallery-caption {
                margin-left: 0;
              }
            </style>
            <!-- see gallery_shortcode() in wp-includes/media.php -->";
          $size_class = sanitize_html_class( $size );
          $gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
          $output = apply_filters( 'gallery_style', $gallery_style . "\n\t\t" . $gallery_div );
          $i = 0;
          foreach ( $attachments as $id => $attachment ) {

            $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);

            $output .= "<{$itemtag} class='gallery-item'>";
            $output .= "
              <{$icontag} class='gallery-icon'>
                $link
              </{$icontag}>";
            if ( $captiontag && trim($attachment->post_excerpt) ) {
              $output .= "
                <{$captiontag} class='wp-caption-text gallery-caption'>
                " . wptexturize($attachment->post_excerpt) . "
                </{$captiontag}>";
            }
            $output .= "</{$itemtag}>";
            if ( $columns > 0 && ++$i % $columns == 0 )
              $output .= '<br style="clear: both" />';
          }

          $output .= "
              <br style='clear: both;' />
            </div>\n";

          //remove the filter for link markup 
          //remove_filter( 'wp_get_attachment_link', array($this, 'tc_modify_attachment_link') , 20, 6 );

          return $output;
      }


      /**
       * Add an optional rel="tc-fancybox[]" attribute to all images embedded in a post gallery
       * Based on the original WP function
       * @package Customizr
       * @since Customizr 3.0.5
       *
       */
      function tc_modify_attachment_link( $markup, $id, $size, $permalink, $icon, $text ) {

        if( !apply_filters('tc_gallery_bool', true ) )
            return $markup;

        $tc_fancybox = esc_attr( tc__f( '__get_option' , 'tc_fancybox' ) );

        if ( $tc_fancybox == 1 && $permalink == false ) //add the filter only if link to the attachment file/image
          {
              $id = intval( $id );
              $_post = get_post( $id );

              if ( empty( $_post ) || ( 'attachment' != $_post->post_type ) || ! $url = wp_get_attachment_url( $_post->ID ) )
                return __( 'Missing Attachment' , 'customizr');

              if ( $permalink )
                $url = get_attachment_link( $_post->ID );

              $post_title = esc_attr( $_post->post_title );

              if ( $text )
                $link_text = $text;
              elseif ( $size && 'none' != $size )
                $link_text = wp_get_attachment_image( $id, $size, $icon );
              else
                $link_text = '';

              if ( trim( $link_text ) == '' )
                $link_text = $_post->post_title;
               $markup      = '<a class="grouped_elements" rel="tc-fancybox-group" href="'.$url.'" title="'.$post_title.'">'.$link_text.'</a>';
          }
        

        return $markup;
      }
  }//end of class
endif;