vetcopilot-app/src/components/PullToRefresh.tsx

import React, { useState, useRef, useCallback, useEffect } from 'react'
import { useTranslation } from '../i18n'

interface PullToRefreshProps {
  onRefresh: () => Promise<void>
  children: React.ReactNode
  className?: string
}

export default function PullToRefresh({ onRefresh, children, className = '' }: PullToRefreshProps) {
  const { t } = useTranslation()
  const [refreshing, setRefreshing] = useState(false)
  const [pullDistance, setPullDistance] = useState(0)
  const containerRef = useRef<HTMLDivElement>(null)
  const startY = useRef(0)
  const pulling = useRef(false)
  const refreshThreshold = 60

  const handleTouchStart = useCallback((e: React.TouchEvent) => {
    if (containerRef.current && containerRef.current.scrollTop <= 0) {
      startY.current = e.touches[0].clientY
      pulling.current = true
    }
  }, [])

  const handleTouchMove = useCallback((e: React.TouchEvent) => {
    if (!pulling.current || refreshing) return
    const delta = e.touches[0].clientY - startY.current
    if (delta > 0) {
      setPullDistance(Math.min(delta * 0.4, 100))
    }
  }, [refreshing])

  const handleTouchEnd = useCallback(async () => {
    if (!pulling.current) return
    pulling.current = false
    if (pullDistance >= refreshThreshold && !refreshing) {
      setRefreshing(true)
      try {
        await onRefresh()
      } finally {
        setRefreshing(false)
        setPullDistance(0)
      }
    } else {
      setPullDistance(0)
    }
  }, [pullDistance, refreshing, onRefresh])

  useEffect(() => {
    if (!refreshing && pullDistance === 0) return
    if (!refreshing && pullDistance < refreshThreshold) {
      const timer = setTimeout(() => setPullDistance(0), 300)
      return () => clearTimeout(timer)
    }
  }, [refreshing, pullDistance])

  return (
    <div
      ref={containerRef}
      className={`relative overflow-y-auto ${className}`}
      onTouchStart={handleTouchStart}
      onTouchMove={handleTouchMove}
      onTouchEnd={handleTouchEnd}
    >
      <div
        className="flex items-center justify-center overflow-hidden transition-all duration-300"
        style={{ height: pullDistance }}
      >
        <div className={`flex items-center gap-2 text-xs text-gray-400 transition-all ${refreshing ? 'opacity-100' : ''}`}>
          {refreshing ? (
            <>
              <svg className="w-4 h-4 animate-spin" fill="none" viewBox="0 0 24 24">
                <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
                <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
              </svg>
              {t('components.pullToRefresh.refreshing')}
            </>
          ) : pullDistance >= refreshThreshold ? (
            <>
              <svg className="w-4 h-4 rotate-180" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
                <path strokeLinecap="round" strokeLinejoin="round" d="M19 14l-7 7m0 0l-7-7m7 7V3" />
              </svg>
              {t('components.pullToRefresh.release')}
            </>
          ) : (
            <>
              <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
                <path strokeLinecap="round" strokeLinejoin="round" d="M19 14l-7 7m0 0l-7-7m7 7V3" />
              </svg>
              {t('components.pullToRefresh.pullDown')}
            </>
          )}
        </div>
      </div>
      {children}
    </div>
  )
}