<?php
	/**
	 * @package     Freemius
	 * @copyright   Copyright (c) 2015, Freemius, Inc.
	 * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
	 * @since       1.0.3
	 */

	if ( ! defined( 'ABSPATH' ) ) {
		exit;
	}

	define( 'WP_FS__SECURITY_PARAMS_PREFIX', 's_' );

	/**
	 * Class FS_Security
	 */
	class FS_Security {
		/**
		 * @var FS_Security
		 * @since 1.0.3
		 */
		private static $_instance;
		/**
		 * @var FS_Logger
		 * @since 1.0.3
		 */
		private static $_logger;

		/**
		 * @return \FS_Security
		 */
		public static function instance() {
			if ( ! isset( self::$_instance ) ) {
				self::$_instance = new FS_Security();
				self::$_logger   = FS_Logger::get_logger(
					WP_FS__SLUG,
					WP_FS__DEBUG_SDK,
					WP_FS__ECHO_DEBUG_SDK
				);
			}

			return self::$_instance;
		}

		private function __construct() {
		}

		/**
		 * @param \FS_Scope_Entity $entity
		 * @param int              $timestamp
		 * @param string           $action
		 *
		 * @return string
		 */
		function get_secure_token( FS_Scope_Entity $entity, $timestamp, $action = '' ) {
			return md5(
				$timestamp .
				$entity->id .
				$entity->secret_key .
				$entity->public_key .
				$action
			);
		}

		/**
		 * @param \FS_Scope_Entity $entity
		 * @param int|bool         $timestamp
		 * @param string           $action
		 *
		 * @return array
		 */
		function get_context_params( FS_Scope_Entity $entity, $timestamp = false, $action = '' ) {
			if ( false === $timestamp ) {
				$timestamp = time();
			}

			return array(
				's_ctx_type'   => $entity->get_type(),
				's_ctx_id'     => $entity->id,
				's_ctx_ts'     => $timestamp,
				's_ctx_secure' => $this->get_secure_token( $entity, $timestamp, $action ),
			);
		}
	}
