<template>
  <div style="background: #ececec; padding: 15px">
    <a-card title="按批次对比分析" :loading="loading" :bordered="false">
      <template #extra>
        <!-- <a-select v-model:value="college" style="width: 300px" :options="collegeOptions"></a-select> -->
        <a-cascader v-model:value="collegeMajor" :options="collegeMajorOptions" change-on-select />
        <a-button style="margin-left: 10px;" type="primary" @click="query">查询</a-button>
      </template>
      <div>
        <a-row :gutter="24">
          <a-col :xl="24" :style="{ marginBottom: '24px' }">
            <div class="container">
              <div id="map1" style="width: 100%; height: 400px;"></div>
            </div>
          </a-col>
        </a-row>
      </div>
    </a-card>
  </div>
</template>

<script>
import { defHttp } from '/@/utils/http/axios';
import * as echarts from 'echarts';

export default {
  name: "Analysis",
  data() {
    return {
      Url: {
        getBatch: '/cet/getBatch',
        getCollege: '/cet/getCollege',
        getRate: '/cet/getRateByAllBatch',
        getCollegeMajor: '/cet/getCollegeMajor'
      },
      loading: false,
      collegeOptions: [],
      collegeMajorOptions: [],
      batchOptions: [],
      levelOptions: [
        { value: 'cet4', label: '英语四级' },
        { value: 'cet6', label: '英语六级' }
      ],
      level: null,
      college: null,
      batch: null,
      collegeMajor: null
    };
  },
  methods: {
    dataChart(data) {
      let xData = [];
      let yData = [];
      for (let key in data) {
        xData.push(key);
        // 将数据转换为百分比（加上%）
        yData.push((data[key]).toFixed(1));
      }
      let myChart = echarts.init(document.getElementById("map1"));
      // 指定图表的配置项和数据
      let option = {
        title: {
          text: "学院 / 专业通过率变化",
        },
        xAxis: {
          type: 'category',
          data: xData,
          axisLabel: {
            interval: 0,//代表显示所有x轴标签显示
            rotate: -10,//代表倾斜30度显示
          }
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'shadow'
          },
          formatter: function (params) {
            return params[0].name + '<br/>' +
              '<table>' +
              '<tr><td>' + params[0].marker    + '</td><td style="font-weight: bold;">' + '&nbsp;&nbsp;&nbsp;&nbsp;' + params[0].value + '%' + '</td></tr>' +
              '<tr>'
              + '</table>';
          }
        },
        yAxis: {
          type: 'value',
          name: '通过率',
          axisLabel: {
              formatter: '{value} %'
            }
        },
        series: [
          {
            data: yData,
            type: 'line',
            itemStyle: {
              normal: {
                label: {
                  show: true, //开启显示
                  position: 'top', //在上方显示
                  textStyle: { //数值样式
                    color: 'black',
                    fontSize: 12
                  },
                  formatter: '{c}%',
                }
              }
            }
          }
        ]
      };
      // 使用刚指定的配置项和数据显示图表。
      myChart.setOption(option);
    },
    // 获取批次数据
    async getBatch() {
      const getBatch = await defHttp.get({ url: this.Url.getBatch });
      // const getCollege = await defHttp.get({ url: this.Url.getCollege });

      // this.collegeOptions = getCollege.colleges;
      // this.college = this.collegeOptions[0].value;

      this.level = this.levelOptions[0].value;

      // this.query();
    },
    //获取学院专业级联数据
    async getCollegeMajorData() {
      const res = await defHttp.get({ url: this.Url.getCollegeMajor });
      //通过map方法将数据转换为级联选择器需要的数据格式
      this.collegeMajorOptions = res.collegeMajor.map(item => {
        return {
          value: item.college,
          label: item.college,
          children: item.major.map(major => {
            return {
              value: major,
              label: major
            }
          })
        }
      });
      this.collegeMajor = this.collegeMajorOptions[0].value;
      console.log(this.collegeMajorOptions);
    },
    // 查询数据
    async query() {
      let data = null;
      try {
        console.log("sb", this.collegeMajor);
        //如果this.collegeMajor为null则先赋个值
        if (!this.collegeMajor) {
          this.collegeMajor = ['东语学院'];
        }
        //如果this.collegeMajor[1]不存在则设为null
        let major = this.collegeMajor.length > 1 ? this.collegeMajor[1] : "";
        this.loading = true;
        let params = {
          college: this.collegeMajor[0],
          major: major,
          level: 'cet4',
        }
        data = await defHttp.get({ url: this.Url.getRate, params });
      } finally {
        this.loading = false;
        this.$nextTick(() => {
          this.dataChart(data);
        })
      }
    }
  },
  mounted() {
    this.getCollegeMajorData();
    this.getBatch();
    this.query();
  }

}
</script>

<style lang="less" scoped>
.container {
  display: flex;
  background-color: #fff;
  padding: 15px;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.09);
}

.title {
  font-size: 34px;
  color: rgb(8, 8, 8);
  font-weight: bold;
}
</style>
