public function init_session_cookie() {
		$cookie = $this->get_session_cookie();

		if ( $cookie ) {
			$this->_customer_id        = $cookie[0];
			$this->_session_expiration = $cookie[1];
			$this->_session_expiring   = $cookie[2];
			$this->_has_cookie         = true;
			$this->_data               = $this->get_session_data();

			// If the user logs in, update session.
			if ( is_user_logged_in() && strval( get_current_user_id() ) !== $this->_customer_id ) {
				$guest_session_id   = $this->_customer_id;
				$this->_customer_id = strval( get_current_user_id() );
				$this->_dirty       = true;
				$this->save_data( $guest_session_id );
				$this->set_customer_session_cookie( true );
			}

			// Update session if its close to expiring.
			if ( time() > $this->_session_expiring ) {
				$this->set_session_expiration();
				$this->update_session_timestamp( $this->_customer_id, $this->_session_expiration );
			}
		} else {
			$this->set_session_expiration();
			$this->_customer_id = $this->generate_customer_id();
			$this->_data        = $this->get_session_data();
		}
	}