<template>
    <div>
        <h1>當前求和為：{{sum}}</h1>
        <h3>當前求和放大10倍為：{{bigSum}}</h3>
        <h3>我在{{school}}，學習{{subject}}</h3>
        <h3 style="color:red">Person元件的總人數是：{{personList.length}}</h3>
        <select v-model.number="n">
            <option value="
 
1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
        </select>
        <button @click="increment(n)">+</button>
        <button @click="decrement(n)">-</button>
        <button @click="incrementOdd(n)
 
">當前求和為奇數再加</button>
        <button @click="incrementWait(n)">等一等再加</button>
    </div>
</template>

<script>
    import {mapState,mapGetters,mapMutations,mapActions} from 'vuex'
    export default {
        name:'Count',
        data() {
            return {
                n:
 
1, //使用者選擇的數字
            }
        },
        computed:{
            //藉助mapState生成計算屬性，從state中讀取資料。（陣列寫法）
            ...mapState(['sum','school','subject','personList']),
            //藉助mapGetters生成計算屬性，從getters中讀取資料。（陣列寫法）
            ...mapGetters(['bigSum'])
        },
        methods: {
            //藉助mapMutations生成對應的方法，方法中會呼叫commit去聯絡mutations(物件寫法)
            ...mapMutations({increment:'JIA',decrement:'JIAN'}),
            //藉助mapActions生成對應的方法，方法中會呼叫dispatch去聯絡actions(物件寫法)
            ...mapActions({incrementOdd:'jiaOdd',incrementWait:'jiaWait'})
        },
        mounted() {
            // const x = mapState({he:'sum',xuexiao:'school',xueke:'subject'})
            // console.log(x)
        },
    }
</script>

<style lang="css">
    button{
        margin-left: 5px;
    }
</style>

<template>
    <div>
        <h1>人員列表</h1>
        <h3 style="color:red">Count元件求和為：{{sum}}</h3>
        <input type="text" placeholder="請輸入名字" v-model="name">
        <button @click="add">新增</button>
        <ul>
            <li v-for="p in personList" :key="p.id">{{p.name}}</li>
        </ul>
    </div>
</template>

<script>
    import {nanoid} from 'nanoid'
    export default {
        name:'Person',
        data() {
            return {
                name:''
            }
        },
        computed:{
            personList(){
                return this.$store.state.personList
            },
            sum(){
                return this.$store.state.sum
            }
        },
        methods: {
            add(){
                const personObj = {id:nanoid(),name:this.name}
                this.$store.commit('ADD_PERSON',personObj)
                this.name = ''
            }
        },
    }
</script>

//該檔案用於建立Vuex中最為核心的store
import Vue from 'vue'
//引入Vuex
import Vuex from 'vuex'
//應用Vuex外掛
Vue.use(Vuex)

//準備actions——用於響應元件中的動作
const actions = {
    /* jia(context,value){
        console.log('actions中的jia被呼叫了')
        context.commit('JIA',value)
    },
    jian(context,value){
        console.log('actions中的jian被呼叫了')
        context.commit('JIAN',value)
    }, */
    jiaOdd(context,value){
        console.log('actions中的jiaOdd被呼叫了')
        if(context.state.sum % 2){
            context.commit('JIA',value)
        }
    },
    jiaWait(context,value){
        console.log('actions中的jiaWait被呼叫了')
        setTimeout(()=>{
            context.commit('JIA',value)
        },500)
    }
}
//準備mutations——用於操作資料（state）
const mutations = {
    JIA(state,value){
        console.log('mutations中的JIA被呼叫了')
        state.sum += value
    },
    JIAN(state,value){
        console.log('mutations中的JIAN被呼叫了')
        state.sum -= value
    },
    ADD_PERSON(state,value){
        console.log('mutations中的ADD_PERSON被呼叫了')
        state.personList.unshift(value)
    }
}
//準備state——用於儲存資料
const state = {
    sum:0, //當前的和
    school:'尚矽谷',
    subject:'前端',
    personList:[
        {id:'001',name:'張三'}
    ]
}
//準備getters——用於將state中的資料進行加工
const getters = {
    bigSum(state){
        return state.sum*10
    }
}

//建立並暴露store
export default new Vuex.Store({
    actions,
    mutations,
    state,
    getters
})