import { View, Swiper, SwiperItem, Text } from '@tarojs/components'
import { useState, useEffect, useRef } from 'react'
import { cn } from '@/utils/cn'
import { Image } from './image'
import Taro from '@tarojs/taro'

export interface CarouselItem {
  /** 图片地址 */
  src: string
  /** 图片标题 */
  title?: string
  /** 图片描述 */
  description?: string
  /** 点击跳转链接 */
  link?: string
  /** 自定义样式 */
  className?: string
}

export interface CarouselProps {
  /** 轮播图数据 */
  items: CarouselItem[]
  /** 是否自动播放 */
  autoplay?: boolean
  /** 自动播放间隔时间（毫秒） */
  interval?: number
  /** 是否显示指示器 */
  showIndicators?: boolean
  /** 指示器位置 */
  indicatorPosition?: 'bottom' | 'top' | 'left' | 'right'
  /** 是否循环播放 */
  circular?: boolean
  /** 图片填充模式 */
  imageMode?: 'scaleToFill' | 'aspectFit' | 'aspectFill' | 'widthFix' | 'top' | 'bottom' | 'center' | 'left' | 'right'
  /** 图片高度 */
  height?: number | string
  /** 圆角大小 */
  rounded?: 'none' | 'sm' | 'md' | 'lg' | 'xl' | 'full'
  /** 点击轮播图回调 */
  onItemClick?: (item: CarouselItem, index: number) => void
  /** 轮播切换回调 */
  onChange?: (current: number) => void
  /** 自定义样式类 */
  className?: string
}

const roundedMap = {
  none: '',
  sm: 'rounded-sm',
  md: 'rounded-md',
  lg: 'rounded-lg',
  xl: 'rounded-xl',
  full: 'rounded-full'
}

const indicatorPositionMap = {
  bottom: 'bottom-4 left-1/2 -translate-x-1/2',
  top: 'top-4 left-1/2 -translate-x-1/2',
  left: 'left-4 top-1/2 -translate-y-1/2 flex-col',
  right: 'right-4 top-1/2 -translate-y-1/2 flex-col'
}

export function Carousel({
  items,
  autoplay = true,
  interval = 3000,
  showIndicators = true,
  indicatorPosition = 'bottom',
  circular = true,
  imageMode = 'aspectFill',
  height = 200,
  rounded = 'md',
  onItemClick,
  onChange,
  className
}: CarouselProps) {
  const [currentIndex, setCurrentIndex] = useState(0)
  const swiperRef = useRef<any>(null)
  const autoplayTimerRef = useRef<NodeJS.Timeout | null>(null)

  // 处理轮播切换
  const handleChange = (e: any) => {
    const index = e.detail.current
    setCurrentIndex(index)
    onChange?.(index)
  }

  // 处理图片点击
  const handleItemClick = (item: CarouselItem, index: number) => {
    onItemClick?.(item, index)
  }

  // 处理指示器点击
  const handleIndicatorClick = (index: number) => {
    setCurrentIndex(index)
    swiperRef.current?.swiperTo?.(index)
  }

  // 自动播放
  useEffect(() => {
    if (autoplay && items.length > 1) {
      autoplayTimerRef.current = setInterval(() => {
        const nextIndex = (currentIndex + 1) % items.length
        setCurrentIndex(nextIndex)
        swiperRef.current?.swiperTo?.(nextIndex)
      }, interval)
    }

    return () => {
      if (autoplayTimerRef.current) {
        clearInterval(autoplayTimerRef.current)
      }
    }
  }, [autoplay, currentIndex, interval, items.length])

  // 页面隐藏时清除定时器
  useEffect(() => {
    const handleHide = () => {
      if (autoplayTimerRef.current) {
        clearInterval(autoplayTimerRef.current)
      }
    }

    const handleShow = () => {
      if (autoplay && items.length > 1) {
        autoplayTimerRef.current = setInterval(() => {
          const nextIndex = (currentIndex + 1) % items.length
          setCurrentIndex(nextIndex)
          swiperRef.current?.swiperTo?.(nextIndex)
        }, interval)
      }
    }

    // Taro 事件监听
    if (typeof Taro !== 'undefined') {
      Taro.eventCenter.on('onHide', handleHide)
      Taro.eventCenter.on('onShow', handleShow)
    }

    return () => {
      if (typeof Taro !== 'undefined') {
        Taro.eventCenter.off('onHide', handleHide)
        Taro.eventCenter.off('onShow', handleShow)
      }
    }
  }, [autoplay, currentIndex, interval, items.length])

  if (!items || items.length === 0) {
    return (
      <View className={cn('w-full bg-gray-100 flex items-center justify-center', roundedMap[rounded], className)}>
        <View className="text-center">
          <View className="i-heroicons-photo-20-solid w-12 h-12 text-gray-400 mb-2" />
          <Text className="text-gray-500 text-sm">暂无图片</Text>
        </View>
      </View>
    )
  }

  return (
    <View className={cn('relative w-full overflow-hidden', roundedMap[rounded], className)}>
      <Swiper
        ref={swiperRef}
        className="w-full"
        current={currentIndex}
        autoplay={false}
        circular={circular}
        onChange={handleChange}
        style={{ height: typeof height === 'number' ? `${height}rpx` : height }}
      >
        {items.map((item, index) => (
          <SwiperItem key={index} className="w-full h-full">
            <View
              className="w-full h-full relative"
              onClick={() => handleItemClick(item, index)}
            >
              <Image
                src={item.src}
                mode={imageMode}
                className="w-full h-full"
                lazyLoad
                showLoading
                showError
              />
              {item.title && (
                <View className="absolute bottom-0 left-0 right-0 bg-gradient-to-t from-black/60 to-transparent p-4">
                  {item.title && (
                    <Text className="text-white text-lg font-semibold">{item.title}</Text>
                  )}
                  {item.description && (
                    <Text className="text-white/80 text-sm mt-1">{item.description}</Text>
                  )}
                </View>
              )}
            </View>
          </SwiperItem>
        ))}
      </Swiper>

      {/* 指示器 */}
      {showIndicators && items.length > 1 && (
        <View className={cn(
          'absolute flex items-center gap-2 z-10',
          indicatorPositionMap[indicatorPosition]
        )}>
          {items.map((_, index) => (
            <View
              key={index}
              className={cn(
                'w-2 h-2 rounded-full transition-all duration-300',
                index === currentIndex
                  ? 'bg-white scale-125'
                  : 'bg-white/50'
              )}
              onClick={() => handleIndicatorClick(index)}
            />
          ))}
        </View>
      )}

      {/* 左右箭头 - 可选 */}
      {items.length > 1 && (
        <>
          <View 
            className={cn(
              'absolute left-2 top-1/2 -translate-y-1/2 z-10',
              'w-8 h-8 bg-black/30 rounded-full flex items-center justify-center',
              'opacity-0 group-hover:opacity-100 transition-opacity'
            )}
            onClick={() => {
              const prevIndex = currentIndex === 0 ? items.length - 1 : currentIndex - 1
              setCurrentIndex(prevIndex)
              swiperRef.current?.swiperTo?.(prevIndex)
            }}
          >
            <View className="i-heroicons-chevron-left-20-solid text-white w-4 h-4" />
          </View>
          <View 
            className={cn(
              'absolute right-2 top-1/2 -translate-y-1/2 z-10',
              'w-8 h-8 bg-black/30 rounded-full flex items-center justify-center',
              'opacity-0 group-hover:opacity-100 transition-opacity'
            )}
            onClick={() => {
              const nextIndex = (currentIndex + 1) % items.length
              setCurrentIndex(nextIndex)
              swiperRef.current?.swiperTo?.(nextIndex)
            }}
          >
            <View className="i-heroicons-chevron-right-20-solid text-white w-4 h-4" />
          </View>
        </>
      )}
    </View>
  )
}