shoptime/com.twin.app.shoptime/src/reducers/cartReducer.js

import { types } from '../actions/actionTypes';

/**
 * Cart Reducer 초기 상태
 */
const initialState = {
  // 장바구니 조회 데이터
  getMyinfoCartSearch: {
    cartList: [],
    totalCount: 0,
  },
  selectCart : {
    cartList: [],
    checkedItems: [],  // ✅ 체크된 상품 정보 저장
    totalCount: 0,
  },
  // 추가/수정/삭제 결과
  lastAction: null,
  error: null,
};

/**
 * Cart Reducer
 * 장바구니 관련 상태를 관리합니다.
 */
export const cartReducer = (state = initialState, action) => {
  switch (action.type) {
    // 장바구니 조회 - API에서 가져온 전체 목록
    case types.GET_MY_INFO_CART_SEARCH:
      return {
        ...state,
        getMyinfoCartSearch: action.payload || {
          cartList: [],
          totalCount: 0,
        },
        error: null,
      };

    // 장바구니에 상품 추가
    case types.INSERT_MY_INFO_CART:
      return {
        ...state,
        selectCart: {
          ...state.selectCart,
          cartList: [...state.selectCart.cartList, action.payload],
          totalCount: (state.getMyinfoCartSearch.totalCount || 0) + 1,
        },
      };

    //체크박스 토글시 상품 처리
    case types.TOGGLE_CHECK_CART: {
      const checkedItem = action.payload.item;
      const isChecked = action.payload.isChecked;

      let updatedCheckedList = state.selectCart?.checkedItems || [];

      if (isChecked) {
        const itemExists = updatedCheckedList.some(
          item => item.prodSno === checkedItem.prodSno
        );
        if (!itemExists) {
          updatedCheckedList = [...updatedCheckedList, checkedItem];
        }
      } else {
        updatedCheckedList = updatedCheckedList.filter(
          item => item.prodSno !== checkedItem.prodSno
        );
      }

      return {
        ...state,
        selectCart: {
          ...state.selectCart,
          checkedItems: updatedCheckedList,
          totalCount: updatedCheckedList.length,
        },
      };
    }

    // 장바구니에서 상품 삭제
    case types.DELETE_MY_INFO_CART:
      return {
        ...state,
        getMyinfoCartSearch: {
          ...state.getMyinfoCartSearch,
          cartList: (state.getMyinfoCartSearch.cartList || []).filter(
            item => item.prodSno !== action.payload.prodSno
          ),
          totalCount: Math.max(0, (state.getMyinfoCartSearch.totalCount || 0) - 1),
        },
      };

    case types.UPDATE_MY_INFO_CART:
      return {
        ...state,
        getMyinfoCartSearch: {
          ...state.getMyinfoCartSearch,
          cartList: (state.getMyinfoCartSearch.cartList || []).map(item =>
            item.prodSno === action.payload.prodSno
              ? { ...item, ...action.payload }
              : item
          ),
        },
      };

    // 장바구니에 상품 추가 (addToCart - 로컬 상태용)
    case types.ADD_TO_CART:
      return {
        ...state,
        lastAction: {
          type: "add",
          data: action.payload,
          timestamp: Date.now(),
        },
        error: null,
      };

    // 장바구니에서 상품 제거 (removeFromCart)
    case types.REMOVE_FROM_CART:
      return {
        ...state,
        lastAction: {
          type: "remove",
          data: action.payload,
          timestamp: Date.now(),
        },
        error: null,
      };

    // 장바구니 상품 수량 업데이트 (updateCartItem)
    case types.UPDATE_CART_ITEM:
      return {
        ...state,
        lastAction: {
          type: "updateQty",
          data: action.payload,
          timestamp: Date.now(),
        },
        error: null,
      };

    // 장바구니 전체 비우기 (clearCart - 로컬 상태 전용)
    case types.CLEAR_CART:
      return {
        ...state,
        getMyinfoCartSearch: {
          cartList: [],
          totalCount: 0,
        },
        lastAction: {
          type: "clear",
          timestamp: Date.now(),
        },
        error: null,
      };

    default:
      return state;
  }
};