<?php
/**
 * Plugin Name: WordPress LMS Plugin by LearnDash®
 * Plugin URI: https://www.learndash.com/
 *
 * Compatibility Description: Ensures compatibility with LearnDash®.
 *
 */

namespace wpCloud\StatelessMedia {

  if( !class_exists( 'wpCloud\StatelessMedia\LearnDash' ) ) {

    class LearnDash extends ICompatibility {
      protected $id = 'sfwd-lms';
      protected $title = 'LearnDash LMS';
      protected $constant = 'WP_STATELESS_COMPATIBILITY_LEARNDASH_LMS';
      protected $description = 'Ensures compatibility with LearnDash.';
      protected $plugin_file = [ 'sfwd-lms/sfwd_lms.php' ];

      /**
       * @param $sm
       */
      public function module_init( $sm ) {
        // exclude randomize_filename from LearnDash page
        add_filter( 'stateless_skip_cache_busting', array( $this, 'skip_cache_busting' ), 10, 2 );
      }

      /**
       * Whether skip cache busting or not.
       *
       * @param $return
       * @param $filename
       * @return mixed
       */
      public function skip_cache_busting( $return, $filename ) {
        if( strpos( $filename, 'sfwd-' ) === 0 || $this->hook_from_learndash() ) {
          return $filename;
        }
        return $return;
      }

      /**
       * Determine where we hook from
       * We need to do this only for something specific in LearnDash plugin
       *
       * @return bool
       */
      private function hook_from_learndash() {
        $call_stack = debug_backtrace();
        if(
          !empty($call_stack[6]['function']) &&
          $call_stack[6]['function'] == 'sanitize_file_name' &&
          (
            strpos( $call_stack[6]['file'], 'class-ld-semper-fi-module.php' ) ||
            strpos( $call_stack[6]['file'], 'class-ld-cpt-instance.php' )
          )
        ) {
          return true;
        }

        return false;
      }

    }

  }

}