import { useRef, useEffect, useState } from 'react';
import * as echarts from 'echarts';

const chartData = [
  { value: 25, name: '校企益邦' },
  { value: 25, name: '科研管理系统' },
  { value: 25, name: '智慧党建平台' },
  { value: 25, name: '实训管理平台' },
];

const rotationNeeded = [45, -45, -135, -225];

function normalizeAngle(a) {
  return ((a % 360) + 360) % 360;
}

function shortestRotation(from, to) {
  const fromN = normalizeAngle(from);
  const toN = normalizeAngle(to);
  let diff = toN - fromN;
  if (diff > 180) diff -= 360;
  if (diff < -180) diff += 360;
  return from + diff;
}

/** 将 hex 颜色转为带透明度的 rgba */
function hexToRgba(hex, alpha) {
  const r = parseInt(hex.slice(1, 3), 16);
  const g = parseInt(hex.slice(3, 5), 16);
  const b = parseInt(hex.slice(5, 7), 16);
  return `rgba(${r},${g},${b},${alpha})`;
}

export default function RosePieChart({ onSelect, activeIndex, colors }) {
  const containerRef = useRef(null);
  const chartRef = useRef(null);
  const rotationRef = useRef(0);
  const [rotation, setRotation] = useState(0);

  // 默认回退颜色
  const safeColors = colors?.length === 4 ? colors : ['#60ce93', '#0c86cf', '#aa3130', '#8b50ee'];

  useEffect(() => {
    if (!containerRef.current) return;

    chartRef.current = echarts.init(containerRef.current, null, { renderer: 'canvas' });

    chartRef.current.setOption({
      tooltip: {
        trigger: 'item',
        backgroundColor: 'rgba(10,22,40,0.95)',
        borderColor: 'rgba(59,130,246,0.3)',
        borderWidth: 1,
        textStyle: { color: '#e2e8f0', fontSize: 13 },
        formatter: '{b}',
      },
      series: [{
        type: 'pie',
        radius: ['25%', '75%'],
        center: ['50%', '50%'],
        startAngle: 90,
        padAngle: 3,
        itemStyle: { borderRadius: 6, borderWidth: 0 },
        label: {
          show: true,
          position: 'inside',
          color: '#e2e8f0',
          fontSize: 15,
          fontWeight: 'bold',
          rotate: 'tangential',
          formatter: '{b}',
        },
        emphasis: {
          scaleSize: 12,
          itemStyle: {
            shadowBlur: 40,
            shadowColor: 'rgba(59,130,246,0.5)',
            borderColor: 'rgba(59,130,246,0.6)',
            borderWidth: 0,
          },
          label: { fontSize: 14, fontWeight: 'bold', color: '#fff' },
        },
        data: chartData.map((d, i) => ({
          ...d,
          itemStyle: { color: safeColors[i], opacity: 1, borderRadius: 6, borderWidth: 0 },
        })),
        animationType: 'scale',
        animationEasing: 'elasticOut',
        animationDuration: 1200,
      }],
    });

    const handleResize = () => chartRef.current?.resize();
    window.addEventListener('resize', handleResize);

    return () => {
      window.removeEventListener('resize', handleResize);
      chartRef.current?.dispose();
      chartRef.current = null;
    };
  }, []);

  useEffect(() => {
    const chart = chartRef.current;
    if (!chart) return;

    const isActive = activeIndex !== null && activeIndex !== undefined;

    const target = isActive ? rotationNeeded[activeIndex] : 0;
    const newAngle = shortestRotation(rotationRef.current, target);
    rotationRef.current = newAngle;
    setRotation(newAngle);

    chart.setOption({
      series: [{
        data: chartData.map((d, i) => ({
          ...d,
          label: { color: isActive && activeIndex === i ? '#fff' : safeColors[i] },
          itemStyle: {
            color: isActive && activeIndex !== i ? hexToRgba(safeColors[i], 0.2) : safeColors[i],
            opacity: 1,
            borderRadius: 6,
            borderColor: 'rgba(15,23,42,0.8)',
            borderWidth: 0,
          },
        })),
      }],
    });
  }, [activeIndex]);

  useEffect(() => {
    const chart = chartRef.current;
    if (!chart) return;

    const handler = (params) => {
      if (onSelect && params.dataIndex !== undefined) {
        onSelect(params.dataIndex);
      }
    };
    chart.on('click', handler);
    return () => chart.off('click', handler);
  }, [onSelect]);

  return (
    <div
      className="inline-block w-full"
      style={{
        transform: `rotate(${rotation}deg)`,
        transition: 'transform 1s cubic-bezier(0.4, 0, 0.2, 1)',
      }}
    >
      <div ref={containerRef} className="w-full h-[600px] md:h-[720px]" />
    </div>
  );
}