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<?php

add_filter ( 'woogc/ps/synchronize_product/child_product', '_woogc_synchronize_product_data', 10, 3 );
    /**
    * Ensure the synchronyzed image files can be found on local shop
    * 
    * @param mixed $child_product
    * @param mixed $main_product_data
    * @param mixed $origin_product_blog_ID
    */
    function _woogc_synchronize_product_data( $child_product, $main_product_data, $origin_product_blog_ID )
        {
            
            $rtwpvg_images  =   $child_product->get_meta( 'rtwpvg_images' );
            
            if ( empty ( $rtwpvg_images )   ||  ! is_array ( $rtwpvg_images )   ||  count ( $rtwpvg_images )    <   1  )
                return $child_product;
                
            $gallery    =   array();
            
            foreach ( $rtwpvg_images    as  $origin_image_id )
                {
                    $image_id   =   _woogc_synchronize_image( $origin_image_id, $origin_product_blog_ID );
                    if ( $image_id  >   0   )
                        $gallery[]  =   $image_id;
                }
                
            if ( count ( $gallery ) >   0   )
                {
                    $child_product->update_meta_data( 'rtwpvg_images', $gallery ); 
                }
                
            return $child_product;   
        }
        
        
    
    /**
    * Synchronize image to child product
    * 
    * @param mixed $prop_value
    * @param mixed $origin_product_blog_ID
    * @param mixed $synchronized_product_ID
    */
    function _woogc_synchronize_image( $prop_value, $origin_product_blog_ID )
        {
            //Check if the current image ID has been previously synchronized tothe  current shop
            global $wpdb;
            
            $mysql_query        =   $wpdb->prepare( "SELECT meta_value FROM ". $wpdb->postmeta . " WHERE meta_key = '_woogc_image_sync_%d_%d'", $origin_product_blog_ID, $prop_value );
            $local_image_id     =   $wpdb->get_var( $mysql_query );
        
            if ( ! empty ( $local_image_id ) )
                {                            
                    //check if the image still exists
                    $image_data =   get_post( $local_image_id );
                    
                    if ( is_object ( $image_data ) &&   $image_data->post_type  ==  'attachment' )
                        return $local_image_id;
                }
            
            switch_to_blog( $origin_product_blog_ID );
            
            $image_data =   wp_get_attachment_image_src( $prop_value, 'full' );
            
            restore_current_blog();
                
            $local_image_id =   media_sideload_image ( $image_data[0], 0, null, 'id' );
            
            if ( is_int ( $local_image_id )  &&  $local_image_id > 0 )
                {
                    update_post_meta( $local_image_id, '_woogc_image_sync_' . $origin_product_blog_ID . '_' . $prop_value,  $local_image_id );
                    
                    return $local_image_id;    
                }
            
            return FALSE;
        
        }