<?php
namespace EnableMediaReplace;

class emrCache
{
    protected $has_supercache  = false; // supercache seems to replace quite fine, without our help. @todo Test if this is needed
    protected $has_w3tc = false;
    protected $has_wpengine = false;
    protected $has_fastestcache = false;
    protected $has_siteground = false;

    public function __construct()
    {

    }

    /** Checks which cache plugins are active on the moment a flush is needed */
    public function checkCaches()
    {
      if ( function_exists( 'w3tc_pgcache_flush' ) )
        $this->has_w3tc = true;

      if ( function_exists('wp_cache_clean_cache') )
        $this->has_supercache = true;

      if ( class_exists( 'WpeCommon' ) )
          $this->has_wpengine = true;

      global $wp_fastest_cache;
      if ( method_exists( 'WpFastestCache', 'deleteCache' ) && !empty( $wp_fastest_cache ) )
          $this->has_fastestcache = true;

      // SG SuperCacher
      if (function_exists('sg_cachepress_purge_cache')) {
	        $this->has_siteground = true;
      }

      // @todo WpRocket?
      // @todo BlueHost Caching?
    }

    /* Tries to flush cache there were we have issues
    *
    * @param Array $args Argument Array to provide data.
    */
    public function flushCache($args)
    {
        $defaults = array(
            'flush_mode' => 'post',
            'post_id' => 0,
        );

        $args = wp_parse_args($args, $defaults);
        $post_id = $args['post_id']; // can be zero!

        // important - first check the available cache plugins
        $this->checkCaches();

        // general WP
        if ($post_id > 0)
          clean_post_cache($post_id);
        else
          wp_cache_flush();

        /*  Verified working without.
          if ($this->has_supercache)
            $this->removeSuperCache();
        */
        if ($this->has_w3tc)
            $this->removeW3tcCache();

        if ($this->has_wpengine)
            $this->removeWpeCache();

        if ($this->has_siteground)
            $this->removeSiteGround();

        if ($this->has_fastestcache)
            $this->removeFastestCache();

    }

    protected function removeSuperCache()
    {
       global $file_prefix, $supercachedir;
	     if ( empty( $supercachedir ) && function_exists( 'get_supercache_dir' ) ) {
	          $supercachedir = get_supercache_dir();
	     }
	     wp_cache_clean_cache( $file_prefix );
    }

    protected function removeW3tcCache()
    {
      w3tc_pgcache_flush();
    }

    protected function removeWpeCache()
    {
      if ( method_exists( 'WpeCommon', 'purge_memcached' ) ) {
          \WpeCommon::purge_memcached();
      }
      if ( method_exists( 'WpeCommon', 'clear_maxcdn_cache' ) ) {
          \WpeCommon::clear_maxcdn_cache();
      }
      if ( method_exists( 'WpeCommon', 'purge_varnish_cache' ) ) {
          \WpeCommon::purge_varnish_cache();
      }
    }

    protected function removeFastestCache()
    {
      global $wp_fastest_cache;
      $wp_fastest_cache->deleteCache();
    }

    protected function removeSiteGround()
    {
    		sg_cachepress_purge_cache();
    }

}
