<?php
/**
 * Seesion cahce handler
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

if ( ! class_exists( 'Jet_Data_Importer_Session_Cache' ) ) {

	/**
	 * Define Jet_Data_Importer_Session_Cache class
	 */
	class Jet_Data_Importer_Session_Cache extends Jet_Data_Importer_Cache_Handler {

		/**
		 * Base caching group name
		 *
		 * @var string
		 */
		private $base_group = null;

		/**
		 * Constructor for the class
		 */
		public function __construct( $base_group ) {
			$this->base_group = $base_group;
		}

		/**
		 * Store passed value in cache with passed key.
		 *
		 * @param  string $key   Caching key.
		 * @param  mixed  $value Value to save.
		 * @param  string $group Caching group.
		 * @return bool
		 */
		public function update( $key = null, $value = null, $group = 'global' ) {

			$this->setup_cahe_group( $group );

			$_SESSION[ $this->base_group ][ $group ][ $key ] = $value;
		}

		/**
		 * Returns all stored cache
		 *
		 * @return array
		 */
		public function get_all() {
			if ( ! isset( $_SESSION[ $this->base_group ] ) ) {
				return array();
			}
		}

		/**
		 * Returns whole stored group
		 *
		 * @return array
		 */
		public function get_group( $group = 'global' ) {
			if ( ! isset( $_SESSION[ $this->base_group ][ $group ] ) ) {
				return array();
			}
			return $_SESSION[ $this->base_group ][ $group ];
		}

		/**
		 * Returns current value by key
		 *
		 * @return array
		 */
		public function get( $key = null, $group = 'global' ) {

			if ( ! isset( $_SESSION[ $this->base_group ][ $group ] ) ) {
				return false;
			}

			if ( ! isset( $_SESSION[ $this->base_group ][ $group ][ $key ] ) ) {
				return false;
			}

			return $_SESSION[ $this->base_group ][ $group ][ $key ];
		}

		/**
		 * Create base caching group if not exist.
		 */
		public function setup_cahe() {

			if ( ! isset( $_SESSION[ $this->base_group ] ) ) {
				$_SESSION[ $this->base_group ] = array();
			}

		}

		/**
		 * Create new group in base caching group if not exists
		 */
		public function setup_cahe_group( $group = 'global' ) {

			$this->setup_cahe();

			if ( ! isset( $_SESSION[ $this->base_group ][ $group ] ) ) {
				$_SESSION[ $this->base_group ][ $group ] = array();
			}

		}

		/**
		 * Returns whole stored group
		 *
		 * @return void
		 */
		public function clear_cache( $group = null ) {

			if ( isset( $_SESSION[ $this->base_group ]['mapping'] ) ) {
				update_option( 'cache', $_SESSION[ $this->base_group ]['mapping'] );
			}

			if ( null !== $group ) {
				$_SESSION[ $this->base_group ][ $group ] = array();
			} else {
				$_SESSION[ $this->base_group ] = array();
			}


		}


	}

}