import { createRoot, Root } from 'react-dom/client'
import { motion } from 'framer-motion'
import React from 'react'

export type FlyToPosition = 'center' | 'top-left' | 'top-right' | 'bottom-left' | 'bottom-right'

export interface FlyToAnimationOptions {
  /** 起始元素的 ref */
  fromRef: React.RefObject<HTMLElement | null>
  /** 目标元素的 ref */
  toRef: React.RefObject<HTMLElement | null>
  /** 目标位置（相对于目标元素） */
  targetPosition?: FlyToPosition
  /** 动画持续时间（毫秒） */
  duration?: number
  /** 动画缓动函数 */
  ease?: string | number[]
  /** 动画完成回调 */
  onComplete?: () => void
  /** 自定义样式 */
  className?: string
  /** 缩放比例（从起始到目标） */
  scale?: { from: number; to: number }
  /** 透明度（从起始到目标） */
  opacity?: number[]
}

interface AnimationInstance extends FlyToAnimationOptions {
  id: string
  startPos: { x: number; y: number }
  targetPos: { x: number; y: number }
  elementHtml: string
}

class FlyToAnimationManagerClass {
  private animations: Map<string, AnimationInstance> = new Map()
  private containerRoot: Root | null = null

  // 初始化容器
  private initContainer() {
    if (typeof window === 'undefined') return
    if (this.containerRoot) return

    const container = document.createElement('div')
    container.id = 'fly-to-animation-container'
    document.body.appendChild(container)

    this.containerRoot = createRoot(container)
    this.render()
  }

  // 渲染动画容器
  private render() {
    if (!this.containerRoot) return

    const animations = Array.from(this.animations.values())

    this.containerRoot.render(
      <>
        {animations.map((animation) => (
          <FlyToAnimationItem key={animation.id} animation={animation} />
        ))}
      </>
    )
  }

  // 通知更新
  private notify() {
    this.render()
  }

  // 创建动画
  flyTo(options: FlyToAnimationOptions) {
    const { fromRef, toRef } = options

    if (!fromRef?.current || !toRef?.current) {
      console.warn('FlyToAnimation: fromRef 或 toRef 未设置')
      return
    }

    this.initContainer()

    // 使用 requestAnimationFrame 确保在下一帧获取准确的位置
    requestAnimationFrame(() => {
      const fromRect = fromRef.current!.getBoundingClientRect()
      const toRect = toRef.current!.getBoundingClientRect()

      // 计算起始位置（起始元素的中心）
      const startX = fromRect.left + fromRect.width / 2
      const startY = fromRect.top + fromRect.height / 2

      // 计算目标位置
      const targetPosition = options.targetPosition || 'center'
      let targetX = 0
      let targetY = 0

      switch (targetPosition) {
        case 'center':
          targetX = toRect.left + toRect.width / 2
          targetY = toRect.top + toRect.height / 2
          break
        case 'top-left':
          targetX = toRect.left
          targetY = toRect.top
          break
        case 'top-right':
          targetX = toRect.right
          targetY = toRect.top
          break
        case 'bottom-left':
          targetX = toRect.left
          targetY = toRect.bottom
          break
        case 'bottom-right':
          targetX = toRect.right
          targetY = toRect.bottom
          break
      }

      // 克隆起始元素的 HTML 内容和样式
      // 使用 cloneNode 深度克隆，包括所有子元素
      const clonedElement = fromRef.current!.cloneNode(true) as HTMLElement

      // 复制计算后的样式到克隆元素，确保尺寸正确
      const computedStyle = window.getComputedStyle(fromRef.current!)

      // 复制所有样式属性
      const allStyles = Array.from(computedStyle)
      allStyles.forEach((prop) => {
        const value = computedStyle.getPropertyValue(prop)
        if (value) {
          clonedElement.style.setProperty(prop, value)
        }
      })

      // 确保克隆元素的尺寸与原始元素一致
      clonedElement.style.width = `${fromRect.width}px`
      clonedElement.style.height = `${fromRect.height}px`
      clonedElement.style.position = 'absolute'
      clonedElement.style.left = '0'
      clonedElement.style.top = '0'
      clonedElement.style.margin = '0'
      clonedElement.style.padding = '0'

      // 获取克隆后的 HTML（只获取内部内容，不包含外层元素）
      const elementHtml = clonedElement.innerHTML

      // 创建动画实例
      const id = `fly-to-${Date.now()}-${Math.random().toString(36).slice(2, 11)}`
      const instance: AnimationInstance = {
        id,
        ...options,
        startPos: { x: startX, y: startY },
        targetPos: { x: targetX, y: targetY },
        elementHtml,
      }

      this.animations.set(id, instance)
      this.notify()

      // 动画完成后自动清理
      const duration = options.duration || 1200
      setTimeout(() => {
        this.remove(id)
        options.onComplete?.()
      }, duration)
    })
  }

  // 移除动画
  remove(id: string) {
    this.animations.delete(id)
    this.notify()
  }
}

// 创建全局单例
export const flyToAnimationManager = new FlyToAnimationManagerClass()

// 单个动画项组件
const FlyToAnimationItem = ({ animation }: { animation: AnimationInstance }) => {
  const {
    startPos,
    targetPos,
    elementHtml,
    duration = 1200,
    ease = 'easeInOut',
    className = '',
    scale = { from: 1, to: 0.3 },
    opacity = [1, 0.8, 0],
  } = animation

  // 计算 opacity 的 times 数组
  const opacityTimes = opacity.length > 1 ? opacity.map((_, i) => i / (opacity.length - 1)) : [0, 1]

  // 如果 opacity 是数组，使用整个数组；否则使用单个值
  const animateOpacity = opacity.length > 1 ? opacity : (opacity[opacity.length - 1] ?? 0)

  return (
    <motion.div
      initial={{
        x: startPos.x,
        y: startPos.y,
        scale: scale.from,
        opacity: opacity[0] ?? 1,
      }}
      animate={{
        x: targetPos.x,
        y: targetPos.y,
        scale: scale.to,
        opacity: animateOpacity,
      }}
      transition={{
        duration: duration / 1000,
        ease: ease as any,
        opacity:
          opacity.length > 1
            ? {
                times: opacityTimes,
                duration: duration / 1000,
              }
            : {
                duration: duration / 1000,
              },
      }}
      className={`fixed pointer-events-none z-[99999] ${className}`}
      style={{
        left: 0,
        top: 0,
      }}
      transformTemplate={({ x, y, scale }) =>
        `translate(-50%, -50%) translateX(${x}) translateY(${y}) scale(${scale})`
      }
    >
      <div dangerouslySetInnerHTML={{ __html: elementHtml }} style={{ pointerEvents: 'none' }} />
    </motion.div>
  )
}