eiru_pos/src/store/modules/cart.js

import { PUSH_TO_CART, SET_CART_TOTAL } from '@/constants/mutationTypes'
import { ADD_TO_CART, CHANGE_CART_TOTAL } from '@/constants/actionTypes'

const initialState = {
    cartItems: [],
    cartTotal: 0
}

const state = {
    cartItems: initialState.cartItems,
    cartTotal: initialState.cartTotal
}

const getters = {
    /**
     * 
     * @param {*} state 
     */
    cartItems(state) {
        return state.cartItems
    },
    /**
     * 
     * @param {*} state 
     */
    cartTotal(state) {
        return state.cartTotal
    }
}

const mutations = {
    /**
     * 
     * @param {*} state 
     * @param {*} payload 
     */
    [PUSH_TO_CART] (state, payload) {
        let productFound = state.cartItems.find(item => item.id === payload.id)

        console.log(payload)

        if (productFound) {
            productFound.quantity = productFound.quantity + 1
            return
        }

        state.cartItems = [payload, ...state.cartItems]
    },
    /**
     * 
     * @param {*} state 
     * @param {*} payload 
     */
    [SET_CART_TOTAL] (state, payload) {
        state.cartTotal = payload
    }
}

const actions = {
    /**
     * 
     * @param {*} param0 
     * @param {*} payload 
     */
    [ADD_TO_CART] ({ commit }, payload) {
        commit(PUSH_TO_CART, payload)
    },
    /**
     * 
     * @param {*} param0 
     * @param {*} payload 
     */
    [CHANGE_CART_TOTAL] ({ commit }, payload) {
        commit(SET_CART_TOTAL, payload)   
    }
}

export default {
    state,
    getters,
    mutations,
    actions
}