import React, { PureComponent } from 'react';
import { Chart } from '@antv/g2';
import DataSet from '@antv/data-set';
import Debounce from 'lodash-decorators/debounce';
import Bind from 'lodash-decorators/bind';
import equal from '../equal';

class ColumnarStack extends PureComponent {
  componentDidMount() {
    this.renderChart(this.props.data);
    window.addEventListener('resize', this.resize);
  }

  componentWillReceiveProps(nextProps) {
    if (!equal(this.props, nextProps)) {
      this.renderChart(nextProps.data);
    }
  }

  componentWillUnmount() {
    window.removeEventListener('resize', this.resize);
    if (this.chart) {
      this.chart.destroy();
    }
    this.resize.cancel();
  }

  @Bind()
  @Debounce(200)
  resize() {
    if (!this.node) {
      return;
    }
    this.renderChart([]);
  }

  handleRef = (n) => {
    this.node = n;
  };

  renderChart(data) {
    const { xUnit = '', yUnit = '', height } = this.props;
    if (!data || (data && data.length < 1)) return;
    // clean
    if (this.chart) {
      this.chart.destroy();
    }
    this.node.innerHTML = '';
    const chart = new Chart({
      container: this.node,
      autoFit: true, /* 图标自适应 */
      height,
      padding: 'auto',
    });
    // 计算每个柱子的占比
    const ds = new DataSet();
    const dv = ds.createView().source(data).transform({
      type: 'percent',
      field: 'y', // 统计销量
      dimension: 'type', // 每年的占比
      groupBy: ['x'], // 以不同产品类别为分组
      as: 'percent',
    });
    chart.data(dv.rows, {
      percent: {
        min: 0,
        formatter: (val) => {
          return `${(val * 100).toFixed(2)}${yUnit}`;
        },
      },
    });
    chart.axis('x', {
      label: {
        formatter: (val) => {
          return `${val}${xUnit}`;
        },
      },
    });
    chart.interval().adjust('stack').position('x*percent').color('type')
      .tooltip('x*y*type', (name, value, type) => {
        return {
          title: `${name}${xUnit}`,
          name: type,
          value: `${value}`,
        };
      });
    chart.render();
    this.chart = chart;
  }

  render() {
    return (
      <div ref={this.handleRef} />
    );
  }
}

export default ColumnarStack;