<template>
  <div style="height: 100%; width: 100%">
    <div class="chart-title">
      <div class="name" :title="title">
        {{ title }}
      </div>
      <div class="operation">
        <!-- <el-button size="mini" plain @click="initChart()">
          <span class="icon iconfont icontjfx"></span>
        </el-button>
        <el-button size="mini" plain @click="initTable()">
          <span class="icon iconfont icontongjibiao"></span>
        </el-button> -->
        <el-radio v-model="showType" label="chart">chart</el-radio>
        <el-radio v-model="showType" label="table">表格</el-radio>
        <div class="operation-btn" @click="downLoadInfo()">
          <img class="icon" :src="require('../../images/download.png')" />
          <label>下载</label>
        </div>
        <!-- <div class="operation-btn">
          <img class="icon" :src="require('../../images/expand.png')" />
          <label>展开</label>
        </div> -->
      </div>
    </div>
    <div class="dataContainer">
      <div class="IndexLineChart" ref="chart" v-if="!isShowTable"></div>
      <el-table id="dataTable" :data="tableData" v-if="isShowTable" style="width: 100%; height: 100%; overflow: auto">
        <el-table-column
          v-for="item of tabelColumn"
          :key="item.value"
          :prop="item.prop"
          :label="item.label"
          show-overflow-tooltip
        ></el-table-column>
      </el-table>
    </div>
  </div>
</template>

<script lang='ts'>
import echarts, { ECharts } from 'echarts'
import html2canvas from 'html2canvas'
import XLSX from 'xlsx'
import FileSaver from 'file-saver'
import { Vue, Component, Prop, Watch } from 'vue-property-decorator'
@Component({ name: 'IndexLineChart', components: {} })
export default class IndexLineChart extends Vue {
  @Prop({ type: Object, default: () => ({}) }) chartData!: any
  @Watch('chartData', { immediate: true })
  onChangeMethod() {
    this.$nextTick(() => {
      this.initialChart()
    })
  }
  @Prop({ type: Boolean, default: false }) isActive!: boolean
  @Watch('isActive', { immediate: true })
  refetchData(active: boolean) {
    if (active) this.onResize()
  }
  get title() {
    return `${this.chartData.siteName}:${this.chartData.indexName}${
      this.chartData.unit ? `(${this.chartData.unit})` : ''
    }`
  }
  myChart = null
  isShowTable = false
  tableData = []
  tabelColumn = [
    {
      prop: 'siteName',
      label: '厂站'
    },
    {
      prop: 'indexName',
      label: '指标'
    },
    {
      prop: 'staType',
      label: '统计内容'
    },
    {
      prop: 'data',
      label: '指标值'
    },
    {
      prop: 'time',
      label: '时间'
    }
  ]
  showType = 'chart'
  @Watch('showType', { immediate: true })
  showTypeChangeMethod(type) {
    this.$nextTick(() => {
      type == 'chart' ? this.initChart() : this.initTable()
    })
  }
  destroyChart() {
    if (this.myChart != null) {
      this.myChart.dispose()
      this.myChart = null
    }
  }
  onResize() {
    if (this.myChart) {
      this.myChart.resize()
    }
  }
  initialChart() {
    this.destroyChart()
    const { xData: xaxis, seriesData, tableData, siteName, indexName } = this.chartData
    //表格数据
    this.tableData = tableData.map((i) => {
      return {
        ...i,
        siteName,
        indexName
      }
    })
    //
    let seriesValue = []
    seriesData.forEach((item) => {
      seriesValue.push({
        name: item.name,
        data: item.data,
        type: 'line',
        smooth: true
        // symbol: 'none'
      })
    })
    let option = {
      grid: {
        bottom: 20,
        top: 50,
        right: 20,
        left: 20,
        containLabel: true
      },
      tooltip: {
        trigger: 'axis'
      },
      xAxis: {
        type: 'category',
        axisLine: { show: false },
        axisTick: { show: false },
        data: xaxis
      },
      yAxis: {
        type: 'value',
        name: '',
        nameTextStyle: {
          padding: [0, 0, 0, -40],
          align: 'left',
          color: '#2D74E7',
          fontWeight: '500',
          fontSize: '14',
          fontFamily: 'Source Han Sans CN'
        },
        nameGap: 30,
        axisLine: { show: false },
        axisTick: { show: false }
      },
      series: seriesValue
    }
    this.creatChart(option, this.$refs.chart)
  }
  creatChart(option, ref) {
    this.myChart = echarts.init(ref) //this.$refs.chart
    this.myChart.resize()
    this.myChart.setOption(option, {
      notMerge: true
    })
    //图表大小自适应
    window.addEventListener('resize', () => {
      this.myChart.resize()
    })
  }
  initTable() {
    this.isShowTable = true
  }
  initChart() {
    this.isShowTable = false
    this.$nextTick(() => {
      this.initialChart()
    })
  }
  //下载
  downLoadInfo() {
    if (this.isShowTable) {
      this.exportTable()
    } else {
      this.exportChart()
    }
  }
  exportTable() {
    let wb = XLSX.utils.table_to_book(document.querySelector('#dataTable'), { raw: true })
    let wbout = XLSX.write(wb, {
      bookType: 'xlsx',
      bookSST: true,
      type: 'array'
    })
    try {
      FileSaver.saveAs(new Blob([wbout], { type: 'application/octet-stream' }), '数据表格.xlsx')
    } catch (e) {
      if (typeof console !== 'undefined') console.log(e, wbout)
    }
    return wbout
  }
  exportChart() {
    // 图表转换成canvas
    //@ts-ignore
    html2canvas(this.$refs.chart).then(function (canvas) {
      var img = canvas.toDataURL('image/png').replace('image/png', 'image/octet-stream')
      // 创建a标签，实现下载
      var creatIMg = document.createElement('a')
      creatIMg.download = `图表.png` // 设置下载的文件名，
      creatIMg.href = img // 下载url
      document.body.appendChild(creatIMg)
      creatIMg.click()
      creatIMg.remove() // 下载之后把创建的元素删除
    })
  }
}
</script>

<style lang="scss" scoped>
.chart-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 16px;
  position: relative;
  margin-top: 10px;
  height: 20px;
  .name {
    font-family: Source Han Sans CN-Medium;
    font-style: normal;
    font-weight: 500;
    font-size: 14px;
    color: #2d74e7;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .operation {
    // position: absolute;
    // right: 0;
    // z-index: 999;
    display: flex;
    align-items: center;
    @mixin font() {
      color: #333333;
      font-family: Source Han Sans CN;
      font-style: normal;
      font-weight: 400;
      font-size: 14px;
    }
    .el-button {
      padding: 2px;
      border: none;
      color: #333333;
    }
    >>> .el-radio {
      .el-radio__label {
        @include font();
        padding-left: 5px;
      }
      .el-radio__inner::after {
        height: 8px;
        width: 8px;
        background-color: #2083e8;
      }
      .el-radio__inner {
        border: 1px solid rgba(128, 175, 214, 1);
        background-color: transparent;
      }
    }
    .operation-btn {
      display: flex;
      align-items: center;
      cursor: pointer;
      margin-right: 30px;
      .icon {
        height: 14px;
        width: 14px;
        margin-right: 5px;
      }
      label {
        @include font();
        cursor: pointer;
        white-space: nowrap;
      }
    }
  }
}
.dataContainer {
  width: 100%;
  height: calc(100% - 30px);
  .IndexLineChart {
    width: 100%;
    height: 100%;
  }
}
</style>