<template>
  <div :class="{'hidden':hidden}" class="pagination-container">
    <el-pagination
      :background="background"
      :current-page.sync="currentPage"
      :page-size.sync="pageSize"
      :layout="layout"
      :page-sizes="pageSizes"
      :pager-count="pagerCount"
      :total="total"
      v-bind="$attrs"
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
    />
  </div>
</template>

<script>
import { scrollTo } from '@/utils/scroll-to'

export default {
  name: 'Pagination',
  props: {
    total: {
      required: true,
      type: Number
    },
    page: {
      type: Number,
      default: 1
    },
    limit: {
      type: Number,
      default: 50
    },
    pageSizes: {
      type: Array,
      default() {
        return [50, 100, 200, 500, 1000]
      }
    },
    // 移动端页码按钮的数量端默认值5
    pagerCount: {
      type: Number,
      default: 7
    },
    layout: {
      type: String,
      default: 'total, sizes, prev, pager, next, jumper'
    },
    background: {
      type: Boolean,
      default: true
    },
    autoScroll: {
      type: Boolean,
      default: true
    },
    hidden: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      isMobile: false
    }
  },
  mounted() {
    this.isMobile = window.innerWidth < 768
    if (this.isMobile && this.layout === 'total, sizes, prev, pager, next, jumper') {
      this.$emit('update:layout', 'prev, pager, next')
    }
    window.addEventListener('resize', this.handleResize)
  },
  beforeDestroy() {
    window.removeEventListener('resize', this.handleResize)
  },
  computed: {
    currentPage: {
      get() {
        return this.page
      },
      set(val) {
        this.$emit('update:page', val)
      }
    },
    pageSize: {
      get() {
        return this.limit
      },
      set(val) {
        this.$emit('update:limit', val)
      }
    }
  },
  methods: {
    handleResize() {
      const wasMobile = this.isMobile
      this.isMobile = window.innerWidth < 768
      if (wasMobile !== this.isMobile) {
        this.$forceUpdate()
      }
    },
    handleSizeChange(val) {
      if (this.currentPage * val > this.total) {
        this.currentPage = 1
      }
      this.$emit('pagination', { page: this.currentPage, limit: val })
      if (this.autoScroll) {
        scrollTo(0, 800)
      }
    },
    handleCurrentChange(val) {
      this.$emit('pagination', { page: val, limit: this.pageSize })
      if (this.autoScroll) {
        scrollTo(0, 800)
      }
    }
  }
}
</script>

<style scoped>
.pagination-container {
  background: #fff;
  
  @media (max-width: 768px) {
    padding: 10px 0;
    
    ::v-deep .el-pagination {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      align-items: center;
      gap: 5px;
      
      .el-pagination__sizes,
      .el-pagination__total,
      .el-pagination__jump {
        display: none;
      }
      
      .btn-prev,
      .btn-next,
      .el-pager li {
        min-width: 36px;
        height: 36px;
        line-height: 36px;
        font-size: 13px;
      }
    }
  }
}
.pagination-container.hidden {
  display: none;
}
</style>
