import * as echarts from 'echarts'
import 'echarts-gl'

interface Pie3DData {
  name: string
  value: number
  itemStyle?: {
    color?: string
    opacity?: number
  }
  startRatio?: number
  endRatio?: number
}

interface Pie3DOptions {
  data: Pie3DData[]
  height?: number
  hoverHeightScale?: number
  selectOffset?: number
  distance?: number
  boxHeight?: number
  radius?: number
}

interface ParametricEquation {
  u: { min: number; max: number; step: number }
  v: { min: number; max: number; step: number }
  x: (u: number, v: number) => number
  y: (u: number, v: number) => number
  z: (u: number, v: number) => number
}

interface SeriesItem {
  name: string
  type: string
  parametric: boolean
  wireframe: { show: boolean }
  pieData?: Pie3DData
  pieStatus?: { selected: boolean; hovered: boolean; k: number }
  itemStyle?: any
  parametricEquation?: ParametricEquation
}

/**
 * 渲染3D饼图，支持点击选中（外移）、鼠标悬停高亮（升高）、高亮修正，无label/legend。
 * @param dom - 容器DOM
 * @param options - 配置项
 *   options.data: [{name, value, itemStyle}]
 *   options.height: 饼图厚度
 *   options.hoverHeightScale: 高亮时高度放大倍数
 *   options.selectOffset: 选中时外移距离（默认0.1）
 *   options.distance: 视角距离
 *   options.boxHeight: grid3D.boxHeight
 *   options.radius: 半径缩放
 * @returns echartsInstance
 */
export function renderPie3DChart(dom: HTMLElement, options: Pie3DOptions): echarts.ECharts | undefined {
  if (!dom) return
  const myChart = echarts.init(dom)
  const hoverHeightScale = options.hoverHeightScale || 1.2
  const selectOffset = options.selectOffset || 0.1
  const distance = options.distance || 120
  const gridBoxHeight = options.boxHeight || 10
  const R = options.radius || 0.8
  const fixedH = 100

  // 生成扇形的曲面参数方程
  function getParametricEquation(startRatio: number, endRatio: number, isSelected: boolean, isHovered: boolean, k: number, h: number): ParametricEquation {
    const midRatio = (startRatio + endRatio) / 2
    const startRadian = startRatio * Math.PI * 2
    const endRadian = endRatio * Math.PI * 2
    const midRadian = midRatio * Math.PI * 2
    if (startRatio === 0 && endRatio === 1) isSelected = false
    k = typeof k !== 'undefined' ? k : 1
    const offsetX = isSelected ? Math.cos(midRadian) * selectOffset : 0
    const offsetY = isSelected ? Math.sin(midRadian) * selectOffset : 0
    const hoverRate = isHovered ? 1.05 : 1
    return {
      u: { min: -Math.PI, max: Math.PI * 3, step: Math.PI / 32 },
      v: { min: 0, max: Math.PI * 2, step: Math.PI / 20 },
      x: function(u: number, v: number) {
        if (u < startRadian) return offsetX + R * Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
        if (u > endRadian) return offsetX + R * Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
        return offsetX + R * Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate
      },
      y: function(u: number, v: number) {
        if (u < startRadian) return offsetY + R * Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
        if (u > endRadian) return offsetY + R * Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
        return offsetY + R * Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate
      },
      z: function(u: number, v: number) {
        if (u < -Math.PI * 0.5) return Math.sin(u)
        if (u > Math.PI * 2.5) return Math.sin(u) * h * .1
        return Math.sin(v) > 0 ? 1 * h * .1 : -1
      }
    }
  }

  // 生成series
  function getPie3D(pieData: Pie3DData[]): SeriesItem[] {
    const series: SeriesItem[] = []
    let sumValue = 0
    let startValue = 0
    let endValue = 0
    const k = 1 // 实心饼图
    for (let i = 0; i < pieData.length; i++) {
      sumValue += pieData[i].value
      const seriesItem: SeriesItem = {
        name: typeof pieData[i].name === 'undefined' ? `series${i}` : pieData[i].name,
        type: 'surface',
        parametric: true,
        wireframe: { show: false },
        pieData: pieData[i],
        pieStatus: { selected: false, hovered: false, k: k }
      }
      if (pieData[i].itemStyle) {
        const itemStyle: any = {}
        const itemStyleObj: any = pieData[i].itemStyle
        if (itemStyleObj.color) itemStyle.color = itemStyleObj.color
        if (itemStyleObj.opacity !== undefined) itemStyle.opacity = itemStyleObj.opacity
        seriesItem.itemStyle = itemStyle
      }
      series.push(seriesItem)
    }
    for (let i = 0; i < series.length; i++) {
      endValue = startValue + series[i].pieData!.value
      series[i].pieData!.startRatio = startValue / sumValue
      series[i].pieData!.endRatio = endValue / sumValue
      series[i].parametricEquation = getParametricEquation(
        series[i].pieData!.startRatio!,
        series[i].pieData!.endRatio!,
        false,
        false,
        k,
        fixedH   // 所有块厚度一样
      )
      startValue = endValue
    }
    // 透明圆环用于高亮修正
    series.push({
      name: 'mouseoutSeries',
      type: 'surface',
      parametric: true,
      wireframe: { show: false },
      itemStyle: { opacity: 0 },
      parametricEquation: {
        u: { min: 0, max: Math.PI * 2, step: Math.PI / 20 },
        v: { min: 0, max: Math.PI, step: Math.PI / 20 },
        x: function(u: number, v: number) { return Math.sin(v) * Math.sin(u) + Math.sin(u) },
        y: function(u: number, v: number) { return Math.sin(v) * Math.cos(u) + Math.cos(u) },
        z: function(u: number, v: number) { return Math.cos(v) > 0 ? 0.1 : -0.1 }
      }
    })
    return series
  }

  const series = getPie3D(options.data)
  // 不加pie2d，不加legend，不加label
  const option = {
    backgroundColor: 'rgba(0,0,0,0)',
    legend: undefined,
    tooltip: undefined,
    xAxis3D: { min: -1, max: 1 },
    yAxis3D: { min: -1, max: 1 },
    zAxis3D: { min: -1, max: 1 },
    grid3D: {
      show: false,
      boxHeight: gridBoxHeight,
      viewControl: {
        alpha: 35,
        distance: distance,
        rotateSensitivity: 0,
        zoomSensitivity: 0,
        panSensitivity: 0,
        autoRotate: false
      }
    },
    series: series
  }
  myChart.setOption(option, true)

  // 选中/高亮交互
  let hoveredIndex = ''

  // // 点击选中（外移）
  // myChart.on('click', function(params) {
  //   if (!series[params.seriesIndex] || series[params.seriesIndex].type !== 'surface') return;
  //   let isSelected = !series[params.seriesIndex].pieStatus.selected;
  //   let isHovered = series[params.seriesIndex].pieStatus.hovered;
  //   let k = series[params.seriesIndex].pieStatus.k;
  //   let startRatio = series[params.seriesIndex].pieData.startRatio;
  //   let endRatio = series[params.seriesIndex].pieData.endRatio;
  //   // 取消之前选中
  //   if (selectedIndex !== '' && selectedIndex !== params.seriesIndex) {
  //     let prev = series[selectedIndex];
  //     prev.parametricEquation = getParametricEquation(
  //       prev.pieData.startRatio, prev.pieData.endRatio, false, prev.pieStatus.hovered, k, prev.pieData.value
  //     );
  //     prev.pieStatus.selected = false;
  //   }
  //   // 当前选中/取消
  //   series[params.seriesIndex].parametricEquation = getParametricEquation(
  //     startRatio, endRatio, isSelected, isHovered, k, series[params.seriesIndex].pieData.value
  //   );
  //   series[params.seriesIndex].pieStatus.selected = isSelected;
  //   isSelected ? selectedIndex = params.seriesIndex : selectedIndex = '';
  //   myChart.setOption({ series });
  // });

  // 悬停高亮（升高）
  myChart.on('mouseover', function(params: any) {
    if (!series[params.seriesIndex] || !series[params.seriesIndex].pieData) return
    if (hoveredIndex === params.seriesIndex) return
    // 取消之前高亮
    if (hoveredIndex !== '') {
      const prev = series[parseInt(hoveredIndex)]
      if (!prev || !prev.pieData) return
      prev.parametricEquation = getParametricEquation(
        prev.pieData.startRatio!,
        prev.pieData.endRatio!,
        prev.pieStatus!.selected,
        false,
        prev.pieStatus!.k,
        fixedH
      )
      prev.pieStatus!.hovered = false
      hoveredIndex = ''
    }
    // 当前高亮
    const cur = series[params.seriesIndex]
    cur.parametricEquation = getParametricEquation(
      cur.pieData!.startRatio!,
      cur.pieData!.endRatio!,
      cur.pieStatus!.selected,
      true,
      cur.pieStatus!.k,
      fixedH * hoverHeightScale
    )
    cur.pieStatus!.hovered = true
    hoveredIndex = params.seriesIndex.toString()
    myChart.setOption({ series })
  })

  // 全局移出，修正高亮残留
  myChart.on('globalout', function() {
    if (hoveredIndex !== '') {
      const prev = series[parseInt(hoveredIndex)]
      if (!prev || !prev.pieData) return
      prev.parametricEquation = getParametricEquation(
        prev.pieData.startRatio!,
        prev.pieData.endRatio!,
        prev.pieStatus!.selected,
        false,
        prev.pieStatus!.k,
        fixedH
      )
      prev.pieStatus!.hovered = false
      hoveredIndex = ''
      myChart.setOption({ series })
    }
  })

  return myChart
}