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

/**
 * Cart Reducer 초기 상태
 */
const initialState = {
  // 장바구니 조회 데이터
  getMyinfoCartSearch: {
    cartList: [],
    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,        
        getMyinfoCartSearch: {
          ...state.getMyinfoCartSearch,
          cartList: [...state.getMyinfoCartSearch.cartList, action.payload],
          totalCount: (state.getMyinfoCartSearch.totalCount || 0) + 1,
        },
        lastAction: {
          type: "insert",
          data: action.payload,
          timestamp: Date.now(),
        },
        error: null,
      };

    // 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),
        },
        lastAction: {
          type: "delete",
          data: action.payload,
          timestamp: Date.now(),
        },
        error: null,
      };

    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
          ),
        },
        error: null,
      };

    // 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;
  }
};