[스프링부트] Ajax

package com.shop.controller;

import com.shop.dto.CartItemDto;
import com.shop.service.CartService;
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import jakarta.validation.Valid;

import java.security.Principal;
import java.util.List;

import com.shop.dto.CartDetailDto;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PatchMapping;
import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.DeleteMapping;

import com.shop.dto.CartOrderDto;

@Controller
@RequiredArgsConstructor
public class CartController {

    private final CartService cartService;

    /**
     *
     * @param cartItemDto 장바구니에 담을 상품 정보를 받음
     * @param bindingResult
     * @param principal
     * @return
     */
    @PostMapping(value = "/cart")
    public @ResponseBody ResponseEntity order(@RequestBody @Valid CartItemDto cartItemDto, BindingResult bindingResult, Principal principal) {

        // cartItemDto 객체에 데이터 바인딩 시 에러가 있는지 검사
        if (bindingResult.hasErrors()) {
            StringBuilder sb = new StringBuilder();
            List<FieldError> fieldErrors = bindingResult.getFieldErrors();

            for (FieldError fieldError : fieldErrors) {
                sb.append(fieldError.getDefaultMessage());
            }

            return new ResponseEntity<String>(sb.toString(), HttpStatus.BAD_REQUEST);
        }

        String email = principal.getName(); // 현재 로그인한 회원의 이메일 정보
        Long cartItemId;

        try {
            cartItemId = cartService.addCart(cartItemDto, email);
        } catch (Exception e) {
            return new ResponseEntity<String>(e.getMessage(), HttpStatus.BAD_REQUEST);
        }

        return new ResponseEntity<Long>(cartItemId, HttpStatus.OK);
    }

    @GetMapping(value = "/cart")
    public String orderHist(Principal principal, Model model) {
        List<CartDetailDto> cartDetailList = cartService.getCartList(principal.getName());
        model.addAttribute("cartItems", cartDetailList);
        return "cart/cartList";
    }

    @PatchMapping(value = "/cartItem/{cartItemId}") // 자원의 일부 update 시 사용하는 HTTP 메서드 <- 장바구니 상품 수량만 update하고자 함
    public @ResponseBody ResponseEntity updateCartItem(@PathVariable("cartItemId") Long cartItemId, int count, Principal principal) {

        if (count <= 0) {
            return new ResponseEntity<String>("최소 1개 이상 담아주세요", HttpStatus.BAD_REQUEST);
        } else if (!cartService.validateCartItem(cartItemId, principal.getName())) { // 수정 권한 체크
            return new ResponseEntity<String>("수정 권한이 없습니다.", HttpStatus.FORBIDDEN);
        }

        cartService.updateCartItemCount(cartItemId, count); // 장바구니 상품의 개수 업데이트
        return new ResponseEntity<Long>(cartItemId, HttpStatus.OK);
    }

    @DeleteMapping(value = "/cartItem/{cartItemId}") // 요청된 자원 삭제 시 사용하는 HTTP 메서드 <- 장바구니 상품 삭제
    public @ResponseBody ResponseEntity deleteCartItem(@PathVariable("cartItemId") Long cartItemId, Principal principal) {

        if (!cartService.validateCartItem(cartItemId, principal.getName())) {
            return new ResponseEntity<String>("수정 권한이 없습니다.", HttpStatus.FORBIDDEN);
        }

        cartService.deleteCartItem(cartItemId);

        return new ResponseEntity<Long>(cartItemId, HttpStatus.OK);
    }

    @PostMapping(value = "/cart/orders")
    public @ResponseBody ResponseEntity orderCartItem(@RequestBody CartOrderDto cartOrderDto, Principal principal) {

        List<CartOrderDto> cartOrderDtoList = cartOrderDto.getCartOrderDtoList();

        if (cartOrderDtoList == null || cartOrderDtoList.size() == 0) {
            return new ResponseEntity<String>("주문할 상품을 선택해주세요", HttpStatus.FORBIDDEN);
        }

        for (CartOrderDto cartOrder : cartOrderDtoList) {
            if (!cartService.validateCartItem(cartOrder.getCartItemId(), principal.getName())) {
                return new ResponseEntity<String>("주문 권한이 없습니다.", HttpStatus.FORBIDDEN);
            }
        }

        Long orderId = cartService.orderCartItem(cartOrderDtoList, principal.getName()); // 주문 로직 호출 결과 = 처리 결과 생성된 주문 번호
        return new ResponseEntity<Long>(orderId, HttpStatus.OK);
    }

}

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