package org.hso.ecommerce.components;

import org.hso.ecommerce.entities.shop.ShoppingCart;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ShoppingCartInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(
            HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        HttpSession session = request.getSession();
        Object shoppingCart = session.getAttribute("shoppingCart");

        if (shoppingCart == null) {
            shoppingCart = new ShoppingCart();
        }

        request.setAttribute("shoppingCart", shoppingCart);

        return true;
    }

    @Override
    public void postHandle(
            HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {

        HttpSession session = request.getSession();
        Object shoppingCart = request.getAttribute("shoppingCart");
        session.setAttribute("shoppingCart", shoppingCart);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
                                Object handler, Exception exception) throws Exception {
    }
}