<?php

defined( 'ABSPATH' ) || die( 'Cheatin&#8217; uh?' );

if( class_exists('WP_Background_Process') ) {

    class SWCFPC_Preloader_Process extends WP_Background_Process
    {

        protected $action = 'swcfpc_cache_preloader_background_process';
        private $main_instance = null;

        function __construct( $main_instance )
        {

            $this->main_instance = $main_instance;

            parent::__construct();

        }

        protected function task($item)
        {

            $objects = $this->main_instance->get_objects();

            if( !isset($item['url']) ) {
                $objects['logs']->add_log( 'preloader::task', 'Unable to find a valid URL to preload. Exit.' );
                return false;
            }

            $objects['logs']->add_log( 'preloader::task', 'Preloading URL '.esc_url_raw( $item['url'] ) );

            $args = array(
                'timeout'    => defined('SWCFPC_CURL_TIMEOUT') ? SWCFPC_CURL_TIMEOUT : 10,
                'blocking'   => true,
                'user-agent' => 'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0',
                'sslverify'  => false,
                'headers' => array(
                    'Accept' => 'text/html'
                )
            );

            $response = wp_remote_get( esc_url_raw( $item['url'] ), $args );

            //$objects['logs']->add_log( 'preloader::task', 'Response headers for URL '.esc_url_raw( $item['url'] ).': '.print_r( wp_remote_retrieve_headers($response), true) );

            // Sleep 2 seconds before to remove the item from queue and preload next url
            sleep(2);

            // Return false to remove item from the queue. If not, the process enter in loop
            return false;

        }

        protected function complete()
        {

            $objects = $this->main_instance->get_objects();

            // Unlock preloader
            $objects['cache_controller']->unlock_preloader();

            // Log preloading complete
            $objects['logs']->add_log( 'preloader::task', 'Preloading complete' );

            parent::complete();

        }

        public function is_process_running()
        {
            return parent::is_process_running();
        }

    }


}