import { useState, useRef, useCallback, useEffect } from "react"
import type { MediaAsset } from "@/api/template-editor"

interface UseAssetPreviewReturn {
  previewAsset: MediaAsset | null
  previewPos: { x: number; y: number }
  handleMouseEnter: (asset: MediaAsset, e: React.MouseEvent) => void
  handleMouseLeave: () => void
}

/**
 * 悬浮预览 Hook —— 延迟 400ms 显示预览浮层
 */
const useAssetPreview = (): UseAssetPreviewReturn => {
  const [previewAsset, setPreviewAsset] = useState<MediaAsset | null>(null)
  const [previewPos, setPreviewPos] = useState({ x: 0, y: 0 })
  const previewTimer = useRef<ReturnType<typeof setTimeout> | null>(null)

  const handleMouseEnter = useCallback((asset: MediaAsset, e: React.MouseEvent) => {
    if (previewTimer.current) clearTimeout(previewTimer.current)
    previewTimer.current = setTimeout(() => {
      const rect = (e.currentTarget as HTMLElement).getBoundingClientRect()
      setPreviewAsset(asset)
      setPreviewPos({
        x: rect.right + 12,
        y: Math.max(8, rect.top - 20),
      })
    }, 400)
  }, [])

  const handleMouseLeave = useCallback(() => {
    if (previewTimer.current) {
      clearTimeout(previewTimer.current)
      previewTimer.current = null
    }
    setPreviewAsset(null)
  }, [])

  // 清理定时器
  useEffect(() => {
    return () => {
      if (previewTimer.current) clearTimeout(previewTimer.current)
    }
  }, [])

  return {
    previewAsset,
    previewPos,
    handleMouseEnter,
    handleMouseLeave,
  }
}

export default useAssetPreview