<template lang="html">
  <div>
    <paginator :pageCount="pageCount" @togglePage="togglePage($event)"></paginator>
  </div>
</template>

<script>
export default {
  data(){
    return{
      //總頁數(shù)
      pageCount: 24
    }
  },
  methods:{
    togglePage(indexPage){
      //打印出當(dāng)前頁數(shù)
      console.log(indexPage);
    },
  }
}
</script>

<template lang="html">
  <div class="pagination">
    <ul>
      <li :class="{disabled: curPage == 1}" @click="prevPage" v-if="pageCount > 1">上一頁</li>
      <li :class="{active: curPage == 1}" @click="page(1)">1</li>
      <li class="ellipsis" v-show="curPage > 5 && pageCount > 10">...</li>
      <li :class="{active: curPage == index+offset}" v-for="(item,index) in middlePages" @click="page(index+offset)">{{index+offset}}</li>
      <li class="ellipsis" v-show="curPage < bigLimit && pageCount > 10">...</li>
      <li :class="{active: curPage == pageCount}" @click="page(pageCount)" v-if="pageCount > 1">{{pageCount}}</li>
      <li :class="{disabled: curPage == pageCount}" @click="nextPage" v-if="pageCount > 1">下一頁</li>
    </ul>
  </div>
</template>

<script>
  export default {
    props:['pageCount'],
    data(){
      return {
        curPage: 1,
      };
    },
    computed:{
      middlePages(){
        if(this.pageCount <= 2){
          return 0;
        }else if(this.pageCount> 2 && this.pageCount <= 10){
          return this.pageCount-2;
        }else{
          return this.curPage > 999 ? 5 : 8;
        }
      },
      bigLimit(){
        return this.middlePages > 5 ? this.pageCount-6 : this.pageCount -3;
      },
      offset(){
        if(this.curPage <= 5){
          return 2;
        }else if(this.curPage >= this.bigLimit){
          return this.bigLimit-2;
        }else{
          return this.middlePages > 5 ? this.curPage-3 : this.curPage-2;
        }
      }
    },
    methods:{
      page(indexPage){
        this.$emit('togglePage',indexPage);
        this.curPage = indexPage;
      },
      prevPage(){
        if(this.curPage != 1){
          this.page(this.curPage-1);
        }
      },
      nextPage(){
        if(this.curPage != this.pageCount){
          this.page(this.curPage+1);
        }
      }
    }
  };
</script>

<style lang="css" scoped>
  @import 'styles/vars.css';
  .pagination{
    width: 660px;
    text-align: center;
    ul{
      margin: 40px 0 60px 0;
      li{
        cursor: pointer;
        display: inline-block;
        padding: 5px 9px;
        border: 1px solid #e1e1eb;
        margin-right: 5px;
        &.active{
          background: #4078c0;
          color: #fff;
        }
        &.ellipsis{
          border: none;
        }
        &.disabled{
          color: #dcdcdc;
        }
      }
    }
  }
</style>