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<?php

class Swift_Performance_Ajax {

/**
       * Init ajax object
       */
      public function __construct(){
            // Ajax handlers
            add_action('wp_ajax_swift_performance_clear_cache', array($this, 'ajax_clear_all_cache'));
            add_action('wp_ajax_swift_performance_clear_assets_cache', array($this, 'ajax_clear_assets_cache'));
            add_action('wp_ajax_swift_performance_update_prebuild_priority', array($this, 'ajax_update_prebuild_priority'));
            add_action('wp_ajax_swift_performance_prebuild_cache', array($this, 'ajax_prebuild_cache'));
            add_action('wp_ajax_swift_performance_stop_prebuild_cache', array($this, 'ajax_stop_prebuild_cache'));
            add_action('wp_ajax_swift_performance_single_prebuild', array($this, 'ajax_single_prebuild'));
            add_action('wp_ajax_swift_performance_single_clear_cache', array($this, 'ajax_single_clear_cache'));
            add_action('wp_ajax_swift_performance_remove_warmup_url', array($this, 'ajax_remove_warmup_url'));
            add_action('wp_ajax_swift_performance_add_warmup_url', array($this, 'ajax_add_warmup_url'));
            add_action('wp_ajax_swift_performance_reset_warmup', array($this, 'ajax_reset_warmup'));
            add_action('wp_ajax_swift_performance_show_rewrites', array($this, 'ajax_show_rewrites'));
            add_action('wp_ajax_swift_performance_change_thread_limit', array($this, 'ajax_change_thread_limit'));
            add_action('wp_ajax_swift_performance_cache_status', array($this, 'ajax_cache_status'));
            add_action('wp_ajax_swift_performance_show_log', array($this, 'ajax_show_log'));
            add_action('wp_ajax_swift_performance_clear_logs', array($this, 'ajax_clear_logs'));
            add_action('wp_ajax_swift_performance_toggle_dev_mode', array($this, 'ajax_toggle_dev_mode'));
            add_action('wp_ajax_swift_performance_bypass_cron', array($this, 'ajax_bypass_cron'));
            add_action('wp_ajax_swift_performance_preview', array($this, 'ajax_preview'));
            add_action('wp_ajax_swift_performance_dismiss_pointer', array($this, 'ajax_dismiss_pointer'));
            add_action('wp_ajax_swift_performance_dismiss_notice', array($this, 'ajax_dismiss_notice'));
      }

/**
	 * Clear all cache ajax callback
	 */
	public function ajax_clear_all_cache(){
		// Check user and nonce
		$this->ajax_auth();

$type = (isset($_REQUEST['type']) ? $_REQUEST['type'] : 'all');

switch ($type) {
                  case 'ajax':
                        Swift_Performance_Cache::clear_transients('ajax');
                        break;
                  case 'dynamic':
                        Swift_Performance_Cache::clear_transients('dynamic');
                        break;
                  case 'all':
                  default:
                        Swift_Performance::log('Ajax action: (clear all cache)', 9);
                        Swift_Performance_Cache::clear_all_cache();
                        break;
            }

wp_send_json(
			array(
				'type' => 'success',
				'text' => __('Cache cleared', 'swift-performance')
			)
		);
	}

/**
	 * Clear assets cache ajax callback
	 */
	public function ajax_clear_assets_cache(){
		// Check user and nonce
		$this->ajax_auth();

Swift_Performance::log('Ajax action: (clear assets cache)', 9);

Swift_Performance_Asset_Manager::clear_assets_cache();
		wp_send_json(
			array(
				'type' => 'success',
				'text' => __('Assets cache cleared', 'swift-performance')
			)
		);
	}

/**
	 * Change prebuild priority ajax callback
	 */
	public function ajax_update_prebuild_priority(){
		// Check user and nonce
		$this->ajax_auth();

$table_name = SWIFT_PERFORMANCE_TABLE_PREFIX . 'warmup';
		parse_str($_REQUEST['data'], $data);

global $wpdb;
		foreach ($data['priorities'] as $key => $value) {
                  Swift_Performance::log('Update prebuild priority: ' . esc_html($key) . '|' . esc_html($value), 9);
			$wpdb->update($table_name, array('priority' => (int)$value), array('id' => esc_sql($key)));
		}

wp_send_json(
			array(
				'type' => 'success'
			)
		);
	}

/**
	 * Single prebuild ajax callback
	 */
	public function ajax_single_prebuild(){
		// Check user and nonce
		$this->ajax_auth();

if (isset($_REQUEST['url'])){
			if (Swift_Performance::check_option('enable-remote-prebuild-cache',1)){
				Swift_Performance::prebuild_cache_remote_hit(array($_REQUEST['url']));
			}
			else {

Swift_Performance::prebuild_cache_hit($_REQUEST['url']);
                        do_action('swift_performance_prebuild_cache_hit', $_REQUEST['url']);
			}
		}

$time = Swift_Performance_Cache::get_cache_time($_REQUEST['url']);

wp_send_json(
			array(
				'type' => 'success',
				'date' => (empty($time) ? '-' : get_date_from_gmt( date( 'Y-m-d H:i:s', $time ), get_option('date_format') . ' ' .get_option('time_format') )),
				'status' => Swift_Performance_Cache::get_cache_type($_REQUEST['url'])
			)
		);
	}

/**
	 * Single clear cache ajax callback
	 */
	public function ajax_single_clear_cache(){
		// Check user and nonce
		$this->ajax_auth();

if (isset($_REQUEST['url'])){
			Swift_Performance_Cache::clear_permalink_cache($_REQUEST['url']);
		}

$time = Swift_Performance_Cache::get_cache_time($_REQUEST['url']);

wp_send_json(
			array(
				'type' => 'success',
				'date' => (empty($time) ? '-' : date_i18n('Y-m-d H:i:s', $time)),
				'status' => Swift_Performance_Cache::get_cache_type($_REQUEST['url'])
			)
		);
	}

/**
	 * Remove warmup URL ajax callback
	 */
	public function ajax_remove_warmup_url(){
		// Check user and nonce
		$this->ajax_auth();

if (isset($_REQUEST['url'])){
                  Swift_Performance::set_option('automated_prebuild_cache', 0);

// Clear from cache
                  Swift_Performance_Cache::clear_permalink_cache($_REQUEST['url']);

// Remove from warmup table
			global $wpdb;
			$table_name = SWIFT_PERFORMANCE_TABLE_PREFIX . 'warmup';
			$wpdb->delete($table_name, array('url' => $_REQUEST['url']));
                  Swift_Performance::log('Remove warmup URL: ' . esc_html($_REQUEST['url']), 9);
		}

$time = Swift_Performance_Cache::get_cache_time($_REQUEST['url']);

/**
	 * Add warmup URL ajax callback
	 */
	public function ajax_add_warmup_url(){
		global $wpdb;

// Check user and nonce
		$this->ajax_auth();

if (!isset($_REQUEST['url']) || empty($_REQUEST['url'])){
			wp_send_json(
				array(
					'type' => 'critical',
					'text' => __('The given URL was empty.', 'swift-performance')
				)
			);
			die;
		}

$url 		= $_REQUEST['url'];
		$priority	= (isset($_REQUEST['priority']) ? (int)$_REQUEST['priority'] : Swift_Performance::get_default_warmup_priority());

$host = parse_url($url, PHP_URL_HOST);
		if (empty($host)){
			$url = home_url($url);
		}

if (parse_url($url, PHP_URL_HOST) !== parse_url(home_url(), PHP_URL_HOST)){
			wp_send_json(
				array(
					'type' => 'critical',
					'text' => __('The given URL was invalid (internal links only).', 'swift-performance')
				)
			);
			die;
		}

$table_name = SWIFT_PERFORMANCE_TABLE_PREFIX . 'warmup';
		$wpdb->query($wpdb->prepare("INSERT IGNORE INTO {$table_name} (id, url, priority, menu_item) VALUES (%s, %s, %d, 0)", Swift_Performance::get_warmup_id($url), $url, $priority ));

Swift_Performance::log('Add warmup URL: ' . esc_html($url), 9);

wp_send_json(
			array(
				'type' => 'success',
			)
		);
	}

/**
	 * Single clear cache ajax callback
	 */
	public function ajax_reset_warmup(){
		// Check user and nonce
		$this->ajax_auth();

global $wpdb;
            // Drop and re-create warmup table
            $wpdb->query('DROP TABLE IF EXISTS ' . SWIFT_PERFORMANCE_TABLE_PREFIX . 'warmup');
            delete_option(SWIFT_PERFORMANCE_TABLE_PREFIX . 'db_version');
            delete_transient('swift_performance_initial_prebuild_links');
            Swift_Performance::db_install();
            Swift_Performance_Cache::clear_all_cache();
            Swift_Performance::get_prebuild_urls();

Swift_Performance::log('Reset warmup table', 9);

wp_send_json(
			array(
				'type' => 'success',
			)
		);
	}

/**
	 * Prebuild cache ajax callback
	 */
	public function ajax_prebuild_cache(){
		// Check user and nonce
		$this->ajax_auth();

Swift_Performance::log('Ajax action: (prebuild cache)', 9);

Swift_Performance::stop_prebuild();
		wp_schedule_single_event(time(), 'swift_performance_prebuild_cache');
		wp_send_json(
			array(
				'type' => 'info',
				'text' => __('Prebuilding cache is in progress', 'swift-performance')
			)
		);
	}

/**
	 * Stop prebuild cache ajax callback
	 */
	public function ajax_stop_prebuild_cache(){
		// Check user and nonce
		$this->ajax_auth();

Swift_Performance::log('Ajax action: (stop prebuild cache)', 9);
		Swift_Performance::stop_prebuild();
		wp_send_json(
			array(
				'type' => 'info',
				'text' => __('Prebuilding cache stopped by user', 'swift-performance')
			)
		);
	}

/**
	 * Show the rewrite rules
	 */
	public function ajax_show_rewrites(){
		// Check user and nonce
		$this->ajax_auth();

switch (Swift_Performance::server_software()){
			case 'apache':
				$htaccess = trailingslashit(str_replace(site_url(), ABSPATH, Swift_Performance::home_url())) . '.htaccess';

if (file_exists($htaccess) && is_writable($htaccess)){
		               	$message = __('It seems that your htaccess is writable, you don\'t need to add rules manually.', 'swift-performance');
		            }
				else {
					$message = __('It seems that your htaccess is NOT writable, you need to add rules manually.', 'swift-performance');
				}
				break;
			case 'nginx':
				$message = __('You need to add rewrite rules manually to your Nginx config file.', 'swift-performance');
				break;
			default:
				$message = __('Caching with rewrites currently available on Apache and Nginx only.', 'swift-performance');

}

wp_send_json(
			array(
				'title'	=> esc_html__('Rewrite Rules', 'swift-performance'),
				'type'	=> 'info',
				'text'	=> $message,
				'rewrites'	=> get_option('swift_performance_rewrites'),
			)
		);
	}

/**
	 * Show the active threads
	 */
	public function ajax_change_thread_limit(){
		// Check user and nonce
		$this->ajax_auth();

$max_threads = Swift_Performance::get_option('max-threads');
		$max_threads += (int)$_POST['limit'];
		Swift_Performance::update_option('max-threads', max(0, $max_threads));

Swift_Performance::log('Change thread limit to ' . $max_threads, 9);
		die;
	}

/**
	 * Show the cache status
	 */
	public function ajax_cache_status(){
		// Check user and nonce
		$this->ajax_auth();

$result = Swift_Performance::cache_status();

// Prebuild status
		$prebuild_status = '';
		$prebuild_hit = get_transient('swift_performance_prebuild_cache_hit');
            $prebuild_pid = get_transient('swift_performance_prebuild_cache_pid');

if (!empty($prebuild_hit)){
			$prebuild_status = sprintf(esc_html__('Prebuild cache in progress: %s'), urldecode($prebuild_hit)) . "\n";
		}
            else if (!empty($prebuild_pid) && $prebuild_pid != 'stop'){
                  $prebuild_status = esc_html__('Prebuild cache is idle') . "\n";
            }

// Threads
		$threads = Swift_Performance::get_thread_array();

wp_send_json(
			array(
				'title'		=> esc_html__('Cache status', 'swift-performance'),
				'type'		=> 'info',
				'prebuild'		=> $prebuild_status,
                        'cache_status'    => array(
                              array('value' => round($result['cached']/max(1,$result['all'])*100), 'label' => esc_html__('Cached', 'swift-performance')),
                              array('value' => round($result['not-cached']/max(1,$result['all'])*100), 'label' => esc_html__('Not Cached', 'swift-performance')),
                              array('value' => round($result['cached-404']/max(1,$result['all'])*100), 'label' => esc_html__('Cached 404', 'swift-performance')),
                              array('value' => round($result['error']/max(1,$result['all'])*100), 'label' => esc_html__('Not Cacheable', 'swift-performance')),
                        ),
				'all_pages'		=> $result['all'],
                        'ajax_objects'	=> $result['ajax_objects'],
                        'ajax_size'	      => sprintf(esc_html__(' %s Mb', 'swift-performance'), number_format($result['ajax_size']/1024/1024,2)),
                        'dynamic_pages'	=> $result['dynamic_pages'],
                        'dynamic_size'	=> sprintf(esc_html__(' %s Mb', 'swift-performance'), number_format($result['dynamic_size']/1024/1024,2)),
				'cached_pages'	=> $result['cached'],
				'size'		=> sprintf(esc_html__(' %s Mb', 'swift-performance'), number_format($result['cache_size']/1024/1024,2)),
				'threads' 		=> count($threads) . '/' . (Swift_Performance::check_option('limit-threads', 1) ? Swift_Performance::get_option('max-threads') : '&#8734;')
			)
		);
	}

/**
	 * Show the latest log
	 */
	public function ajax_show_log(){
		// Check user and nonce
		$this->ajax_auth();

if (file_exists(Swift_Performance::get_option('log-path') . date('Y-m-d') . '.txt')){
			$log = explode("\n", file_get_contents(Swift_Performance::get_option('log-path') . date('Y-m-d') . '.txt'));
			$log = array_reverse($log);
			$log = implode("\n", $log);
		}
		else {
			$log = __('Log is empty', 'swift-performance');
		}

wp_send_json(
			array(
				'title'	=> sprintf(esc_html__('Log - %s', 'swift-performance'), date_i18n(get_option( 'date_format' ))),
				'type'	=> 'info',
				'status'	=> $log
			)
		);
	}

/**
	 * Show the latest log
	 */
	public function ajax_clear_logs(){
		// Check user and nonce
		$this->ajax_auth();

$logpath = Swift_Performance::get_option('log-path');
		if (file_exists($logpath)){
			$files = array_diff(scandir($logpath), array('.','..'));
			foreach ($files as $file) {
				@unlink(trailingslashit($logpath) . $file);
			}
                  Swift_Performance::log('Logs cleared', 9);
		}
		else {
			$log = __('Log is empty', 'swift-performance');
		}

die;
	}

/**
       * Toggle developer mode
       */
      public function ajax_toggle_dev_mode(){
            // Check user and nonce
		$this->ajax_auth();
            if (Swift_Performance::is_developer_mode_active()){
                  delete_option('swift-performance-developer-mode');
                  $message = __('Developer mode deactivated', 'swift-performance');
            }
            else {
                  Swift_Performance_Cache::clear_all_cache();
                  update_option('swift-performance-developer-mode', time() + (3 * 3600));
                  $message = __('Developer mode is active. Caching will bypassed.', 'swift-performance');
            }

wp_send_json(
			array(
				'type' => 'info',
				'text' => $message
			)
		);
      }

/**
      * Check user and nonce
      */
      public function ajax_auth(){
            if (!current_user_can('manage_options') || !isset($_REQUEST['_wpnonce']) || !wp_verify_nonce($_REQUEST['_wpnonce'], 'swift-performance-ajax-nonce')){
                  wp_send_json(
                        array(
                              'type' => 'critical',
                              'text' => __('Your session has expired. Please refresh the page and try again.', 'swift-performance')
                        )
                  );
                  die;
            }
      }

/**
       * Bypass default WP-cron
       */
      public function ajax_bypass_cron(){
            Swift_Performance::set_time_limit(3600, 'ajax_bypass_cron');

//Headers
            header("Content-Type: image/gif");
            header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
            header("Cache-Control: post-check=0, pre-check=0", false);
            header("Pragma: no-cache");

ob_start();
            //1x1 Transparent Gif
            echo base64_decode('R0lGODlhAQABAJAAAP8AAAAAACH5BAUQAAAALAAAAAABAAEAAAICBAEAOw==');
            //Send full content and keep executeing
            header('Connection: close');
            header('Content-Length: '.ob_get_length());
            ob_end_flush();
            ob_flush();
            flush();

$cron_jobs = get_option( 'cron' );
           	foreach ((array)$cron_jobs as $timestamp => $jobs) {
                  if ($timestamp <= time() && !empty($jobs)){
                        foreach ((array)$jobs as $hook => $list){
                              if (preg_match('~swift_performance~', $hook)){
                                    foreach ($list as $item){
                                          if ($item['schedule'] === false){
                                                do_action($hook, $item['args']);
                                                wp_clear_scheduled_hook( $hook, $item['args'] );
                                          }
                                    }
                              }
                        }
                  }
            }

}

/**
       * Show preview
       */
      public function ajax_preview(){
            $this->ajax_auth();

$options = get_option('swift_performance_options');
            foreach ($options as $key => $value) {
                  $value = (isset($_POST['_luv_' . $key]) ? stripslashes_deep($_POST['_luv_' . $key]) : '');
                  $options[$key] = $value;

}
            update_option('swift_performance_preview', $options);
            wp_send_json(
                  array(
                        'url' => add_query_arg('swift-preview','1',home_url())
                  )
            );
      }

/**
       * Dismiss tooltip
       */
      public function ajax_dismiss_pointer(){
            $this->ajax_auth();

$pointers   = (array)get_user_meta(get_current_user_id(), 'swift_pointers', true);
            $pointers[$_POST['id']] = $_POST['id'];
            update_user_meta(get_current_user_id(), 'swift_pointers', $pointers);

}

/**
       * Dismiss notice
       */
      public function ajax_dismiss_notice(){
            $this->ajax_auth();

$messages = (array)apply_filters('swift_performance_admin_notices', get_option('swift_performance_messages', array()));
		unset($messages[$_POST['id']]);
		update_option('swift_performance_messages', $messages);

}

new Swift_Performance_Ajax();