// 引入 ECharts 核心模块，核心模块提供了 ECharts 使用必须要的接口。
import * as ECharts from 'echarts/core'
// 引入柱状图图表，图表后缀都为 Chart
import { BarChart, LineChart, TreeChart, PieChart } from 'echarts/charts'
// 引入标题，提示框，直角坐标系，数据集，内置数据转换器组件，组件后缀都为 Component
import {
  TitleComponent,
  TooltipComponent,
  GridComponent,
  DatasetComponent,
  TransformComponent,
  LegendComponent
} from 'echarts/components'
// 标签自动布局、全局过渡动画等特性
import { LabelLayout, UniversalTransition } from 'echarts/features'
// 引入 Canvas 渲染器，注意引入 CanvasRenderer 或者 SVGRenderer 是必须的一步
import { CanvasRenderer } from 'echarts/renderers'

class EChartsComponent {
  constructor (el) {
    // 注册必须的组件
    ECharts.use(
      [
        TitleComponent,
        TooltipComponent,
        GridComponent,
        DatasetComponent,
        TransformComponent,
        BarChart,
        LineChart,
        TreeChart,
        PieChart,
        LabelLayout,
        UniversalTransition,
        LegendComponent,
        CanvasRenderer
      ]
    )
    // 默认颜色数组
    const defaultColors = [
      '#1f77b4', '#ff7f0e', '#2ca02c', '#d62728', '#9467bd',
      '#8c564b', '#e377c2', '#7f7f7f', '#bcbd22', '#17becf',
      '#aec7e8', '#ffbb78', '#98df8a', '#ff9896', '#c5b0d5',
      '#c49c94', '#f7b6d2', '#c7c7c7', '#dbdb8d', '#9edae5',
      '#393b79', '#637939', '#8c6d31', '#843c39', '#7b4173',
      '#5254a3', '#6baed6', '#9e9ac8', '#807dba', '#6a51a3'
    ]

    const echartsInstance = ECharts.init(el)
    const handler = {
      get: function (target, prop) {
        if (prop === 'setOption') {
          return function (option, ...args) {
            // 合并颜色配置
            const mergedOption = {
              color: defaultColors,
              ...option
            }
            // 调用原始的 setOption 方法
            return target[prop](mergedOption, ...args)
          }
        }
        return target[prop]
      }
    }
    this.el = new Proxy(echartsInstance, handler)
  }

  getEl () {
    return this.el
  }

  // 更新默认颜色
  setDefaultColors (colors) {
    this.defaultColors = colors
  }
}

export default EChartsComponent