import {
  PropType,
  defineComponent,
  nextTick,
  onMounted,
  ref,
  toRefs,
  watch
} from 'vue';
import styles from '../index.module.less';
import icons from '../icons.json';
import { Badge, Image, Skeleton, SkeletonImage, SkeletonParagraph } from 'vant';
import * as echarts from 'echarts';
import { IGradeDistribution } from '../type';
import icon_1 from '../image/icon_1.png';

type EChartsOption = echarts.EChartsOption;

const colors = [
  ['#94C2FD', '#5B8FF9'],
  ['#FBE031', '#F6BD16'],
  ['#93EED2', '#5AD8A6'],
  ['#F5A181', '#E8684A'],
  ['#96A9C4', '#5D7092'],
  ['#A6E6F7', '#6DC8EC'],
  ['#FFCA7D', '#FF9530'],
  ['#DBC6FF', '#B87BDD'],
  ['#D2FFC4', '#92DE97'],

  ['#94C2FD', '#5B8FF9'],
  ['#FBE031', '#F6BD16'],
  ['#93EED2', '#5AD8A6'],
  ['#F5A181', '#E8684A'],
  ['#96A9C4', '#5D7092'],
  ['#A6E6F7', '#6DC8EC'],
  ['#FFCA7D', '#FF9530'],
  ['#DBC6FF', '#B87BDD'],
  ['#D2FFC4', '#92DE97'],

  ['#94C2FD', '#5B8FF9'],
  ['#FBE031', '#F6BD16'],
  ['#93EED2', '#5AD8A6'],
  ['#F5A181', '#E8684A'],
  ['#96A9C4', '#5D7092'],
  ['#A6E6F7', '#6DC8EC'],
  ['#FFCA7D', '#FF9530'],
  ['#DBC6FF', '#B87BDD'],
  ['#D2FFC4', '#92DE97']
];

export default defineComponent({
  name: 'CurrentStudent',
  props: {
    list: {
      type: Array as PropType<IGradeDistribution[]>,
      default: () => []
    }
  },
  setup(props) {
    const firstInit = ref(false);
    const echratsRef = ref();
    const { list } = toRefs(props);
    watch(
      () => list.value,
      () => {
        firstInit.value = true;
        nextTick(() => {
          handleInit();
        });
      }
    );
    let myChart: echarts.ECharts;
    const handleInit = () => {
      if (!list.value.length) return;
      if (myChart) {
        myChart.dispose();
      }
      myChart = echarts.init(echratsRef.value);
      const option: EChartsOption = {
        title: {
          text: list.value
            .reduce((total, item: IGradeDistribution) => {
              total += item.studentNum;
              return total;
            }, 0)
            .toString(),
          subtext: '在读人数',
          textAlign: 'center',
          left: '48%',
          top: '36%',
          textStyle: {
            fontSize: '22px',
            fontWeight: 'bold',
            color: '#333',
            fontFamily: 'DINAlternate-Bold, DINAlternate'
          },
          subtextStyle: {
            fontSize: '12px',
            color: '#777'
          }
        },
        tooltip: {
          trigger: 'item',
          confine: true,
          borderWidth: 0
        },
        series: [
          {
            type: 'pie',
            radius: ['40%', '62%'],
            itemStyle: {
              borderRadius: 2,
              borderColor: '#fff',
              borderWidth: 1
            },
            label: {
              show: false
            },
            labelLine: {
              show: false
            },
            avoidLabelOverlap: false,
            data: list.value.map((item: IGradeDistribution, index: number) => {
              return {
                value: item.studentNum,
                name: item.grade,
                itemStyle: {
                  color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                    { offset: 0, color: colors[index][0] },
                    { offset: 1, color: colors[index][1] }
                  ])
                }
              };
            })
          }
        ]
      };

      option && myChart.setOption(option);
    };

    return () => (
      <div class={styles.item}>
        <div class={styles.top}>
          <Image class={styles.iconRight} src={icons.right} />
          <span>在读学员</span>
          <Image class={styles.iconLeft} src={icons.left} />
        </div>
        <div class={styles.itemTop}>
          <Image class={styles.icon} src={icons[1]} />
          <div class={styles.title}>年级分布</div>
          <div class={styles.des}>(单位：人)</div>
        </div>

        {!firstInit.value && (
          <Skeleton class={[styles.gradeContainer, styles.itemEmtry]}>
            {{
              template: () => (
                <>
                  <div
                    class={styles.gradeEcharts}
                    style={{
                      display: 'flex',
                      justifyContent: 'center',
                      alignItems: 'center'
                    }}>
                    <SkeletonImage style={{ width: '80%', height: '80%' }} />
                  </div>
                  <div style={{ flex: 1, marginLeft: '16px' }}>
                    <SkeletonParagraph />
                    <SkeletonParagraph />
                    <SkeletonParagraph />
                    <SkeletonParagraph />
                    <SkeletonParagraph />
                  </div>
                </>
              )
            }}
          </Skeleton>
        )}

        <div
          style={{ display: list.value.length ? '' : 'none' }}
          class={styles.gradeContainer}>
          <div class={styles.gradeEcharts} ref={echratsRef}></div>
          <div class={styles.tags}>
            {list.value.map((item: IGradeDistribution, i: number) => (
              <div class={styles.tag}>
                <Badge dot color={`linear-gradient(180deg, ${colors[i][0]} 0%, ${colors[i][1]} 100%)`} />
                <div class={styles.tagTitle}>{item.grade}</div>
                <span class={styles.tagNum}>{item.studentNum}</span>
              </div>
            ))}
          </div>
        </div>

        {firstInit.value && !list.value.length && (
          <div class={[styles.gradeContainer, styles.itemEmtry]}>
            <Image src={icon_1} />
          </div>
        )}
      </div>
    );
  }
});