source: src/main/java/tech/techharbor/Web/ShoppingCartController.java

package tech.techharbor.Web;

import jakarta.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import tech.techharbor.Model.OrderTableModel;
import tech.techharbor.Model.ProductModel;
import tech.techharbor.Model.UserTableModel;
import tech.techharbor.Service.DeliveryService;
import tech.techharbor.Service.OrderTableContainsProductService;
import tech.techharbor.Service.OrderTableService;
import tech.techharbor.Service.ProductService;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;


@Controller
public class ShoppingCartController {

    private final ProductService productService;
    private final OrderTableService orderTableService;
    private final OrderTableContainsProductService orderTableContainsProductService;

    private final DeliveryService deliveryService;

    public ShoppingCartController(ProductService productService, OrderTableService orderTableService, OrderTableContainsProductService orderTableContainsProductService, DeliveryService deliveryService) {
        this.productService = productService;
        this.orderTableService = orderTableService;
        this.orderTableContainsProductService = orderTableContainsProductService;
        this.deliveryService = deliveryService;
    }

    List<ProductModel> shoppingCartList = new ArrayList<>();

    @GetMapping("/shoppingCart")
    public String getShoppingCart(HttpSession session, Model model) {
        UserTableModel user = (UserTableModel) session.getAttribute("user");
        Integer totalPrice = 0;

        for (ProductModel product : shoppingCartList) {
            totalPrice += product.getProductPrice();
        }


        model.addAttribute("user", user);
        model.addAttribute("grandTotal", totalPrice);
        model.addAttribute("cartItems", shoppingCartList);

        return "shoppingCart";
    }

    @GetMapping("/removeFromShoppingCart/{id}")
    public String removeFromShoppingCart(@PathVariable Integer id,
                                         HttpSession session,
                                         Model model) {
        ProductModel productModel = shoppingCartList.stream().filter(product -> product.getProductId().equals(id)).findFirst().orElse(null);
        shoppingCartList.remove(productModel);

        UserTableModel user = (UserTableModel) session.getAttribute("user");
        Integer totalPrice = 0;

        for (ProductModel product : shoppingCartList) {
            totalPrice += product.getProductPrice();
        }


        model.addAttribute("user", user);
        model.addAttribute("grandTotal", totalPrice);
        model.addAttribute("cartItems", shoppingCartList);

        return "shoppingCart";
    }

    @GetMapping("/shoppingCart/{id}")
    public String getProduct(@PathVariable Integer id) {
        ProductModel product = productService.findById(id);
        shoppingCartList.add(product);

        return "redirect:/";
    }

    @GetMapping("/checkout")
    public String checkoutPage(Model model, HttpSession session) {

        UserTableModel user = (UserTableModel) session.getAttribute("user");

        Integer grandTotal = 0;

        for (ProductModel product : shoppingCartList) {
            grandTotal += product.getProductPrice();
        }

        model.addAttribute("user", user);
        model.addAttribute("grandTotal", grandTotal);
        model.addAttribute("cartItems", shoppingCartList);
        return "Checkout";
    }

    @GetMapping("/finalizeOrder")
    public String getOrders(HttpSession session,
                            @RequestParam String address) {

        UserTableModel user = (UserTableModel) session.getAttribute("user");

        java.util.Date utilDate = new Date();
        OrderTableModel order = orderTableService.create("Created", new java.sql.Date(utilDate.getTime()), user.getUserId());
        shoppingCartList.forEach(product -> orderTableContainsProductService.create(order.getOrderId(), product.getProductId(), 1));
        deliveryService.create("Pending", address, 37, order.getOrderId());
        shoppingCartList = new ArrayList<>();
        return "redirect:/orders/" + user.getUserId();

    }
}