'use client'

import { useEffect, useState } from 'react'
import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from "@/components/ui/card"
import { Progress } from "@/components/ui/progress"
import { Clock, Link, BarChart2, AlertTriangle, ExternalLink } from 'lucide-react'
import { Skeleton } from "@/components/ui/skeleton"

interface UrlData {
  longUrl: string
  expired: boolean
  stats: {
    visits: number
    expiresAt: string | null
  }
}

export default function RedirectPage({ params }: { params: { shortCode: string } }) {
  const [data, setData] = useState<UrlData | null>(null)
  const [error, setError] = useState<string | null>(null)
  const [progress, setProgress] = useState(0)
  const [isLoading, setIsLoading] = useState(true)

  useEffect(() => {
    const fetchData = async () => {
      try {
        const response = await fetch(`/api/url/${params.shortCode}`)
        const json = await response.json()
        
        if (!response.ok) {
          setError(json.error || 'Failed to fetch URL data')
          return
        }
        
        setData(json)
      } catch (err) {
        setError('Failed to load URL data')
        console.error('Error fetching data:', err);
      } finally {
        setIsLoading(false)
      }
    }

    fetchData()
  }, [params.shortCode])

  useEffect(() => {
    if (data?.longUrl) {
      const interval = setInterval(() => {
        setProgress(prev => {
          if (prev >= 100) {
            clearInterval(interval)
            window.location.href = data.longUrl
            return 100
          }
          return prev + 2
        })
      }, 100)

      return () => clearInterval(interval)
    }
  }, [data?.longUrl])

  if (isLoading) {
    return <LoadingSkeleton />
  }

  if (error || !data) {
    return (
      <div className="min-h-screen bg-gradient-to-br from-gray-100 to-gray-200 flex items-center justify-center p-4">
        <Card className="w-full max-w-md">
          <CardHeader>
            <CardTitle className="text-2xl text-center text-red-600">
              {error || 'URL Not Found'}
            </CardTitle>
          </CardHeader>
          <CardContent>
            <p className="text-center text-gray-600 mb-6">
              请求的短链接不存在或已过期。
            </p>
            <div className="text-center">
              <a
                href="/"
                className="inline-block bg-blue-600 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded transition duration-300 transform hover:scale-105"
              >
                来创建一个短链接吧！
              </a>
            </div>
          </CardContent>
        </Card>
      </div>
    )
  }

  return (
    <div className="min-h-screen bg-gradient-to-br from-blue-100 to-indigo-200 flex items-center justify-center p-4">
      <Card className="w-full max-w-2xl">
        <CardHeader>
          <CardTitle className="text-2xl font-bold text-center text-blue-800">
            您即将被传送...
          </CardTitle>
          <CardDescription className="text-center text-gray-600">
            您将在 {Math.ceil((100 - progress) / 20)} 秒后被传送！
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-6">
          <Card className="bg-blue-50 border-blue-200">
            <CardContent className="p-4">
              <Progress value={progress} className="w-full h-2 mb-2" />
              <p className="text-sm text-blue-600 text-center">
                少女祈祷中...
              </p>
            </CardContent>
          </Card>

          <div className="grid grid-cols-2 gap-4">
            <Card>
              <CardContent className="p-4 flex items-center space-x-2">
                <Link className="text-blue-600 w-5 h-5" />
                <div>
                  <p className="text-sm font-semibold text-gray-700">我们的位置</p>
                  <p className="text-xs text-gray-500 break-all">{`${process.env.NEXT_PUBLIC_BASE_URL}/s/${params.shortCode}`}</p>
                </div>
              </CardContent>
            </Card>
            <Card>
              <CardContent className="p-4 flex items-center space-x-2">
                <BarChart2 className="text-green-600 w-5 h-5" />
                <div>
                  <p className="text-sm font-semibold text-gray-700">访问量</p>
                  <p className="text-xs text-gray-500">{data.stats.visits}</p>
                </div>
              </CardContent>
            </Card>
            <Card>
              <CardContent className="p-4 flex items-center space-x-2">
                <ExternalLink className="text-purple-600 w-5 h-5" />
                <div>
                  <p className="text-sm font-semibold text-gray-700">目的地</p>
                  <p className="text-xs text-gray-500 truncate max-w-[180px]">{data.longUrl}</p>
                </div>
              </CardContent>
            </Card>
            <Card>
              <CardContent className="p-4 flex items-center space-x-2">
                <Clock className="text-orange-600 w-5 h-5" />
                <div>
                  <p className="text-sm font-semibold text-gray-700">过期时间</p>
                  <p className="text-xs text-gray-500">
                    {data.stats.expiresAt ? new Date(data.stats.expiresAt).toLocaleString() : 'Never'}
                  </p>
                </div>
              </CardContent>
            </Card>
          </div>

          <Card className="bg-yellow-50 border-yellow-200">
            <CardHeader className="pb-2">
              <div className="flex items-center space-x-2">
                <AlertTriangle className="text-yellow-600 w-5 h-5" />
                <CardTitle className="text-lg font-bold text-yellow-800">警告</CardTitle>
              </div>
            </CardHeader>
            <CardContent>
              <p className="text-sm text-yellow-800">
                本链接将会为您跳转一个外部网站，我们不对这些外部网站的内容负责，请谨慎访问。
              </p>
            </CardContent>
          </Card>

          <Card className="bg-gradient-to-r from-purple-400 to-pink-500 text-white">
            <CardHeader className="pb-2">
              <CardTitle className="text-lg font-bold">推广</CardTitle>
            </CardHeader>
            <CardContent>
              <p className="text-sm">
                雨云，高性价比的云服务商
                <a href="https://www.rainyun.com/cat_" className="underline ml-1 font-semibold">立即购买！</a>
              </p>
            </CardContent>
          </Card>
        </CardContent>
        <CardFooter className="justify-center">
          <p className="text-sm text-gray-500">
            违规举报：{' '}
            <a href="mailto:${process.env.NEXT_PUBLIC_ADMIN_EMAIL}" className="text-blue-500 hover:underline">
              ${process.env.NEXT_PUBLIC_ADMIN_EMAIL}
            </a>
          </p>
        </CardFooter>
      </Card>
    </div>
  )
}

function LoadingSkeleton() {
  return (
    <div className="min-h-screen bg-gradient-to-br from-blue-100 to-indigo-200 flex items-center justify-center p-4">
      <Card className="w-full max-w-2xl">
        <CardHeader>
          <Skeleton className="h-8 w-3/4 mx-auto mb-2" />
          <Skeleton className="h-4 w-1/2 mx-auto" />
        </CardHeader>
        <CardContent className="space-y-6">
          <Card className="bg-blue-50 border-blue-200">
            <CardContent className="p-4">
              <Skeleton className="h-2 w-full mb-2" />
              <Skeleton className="h-4 w-1/2 mx-auto" />
            </CardContent>
          </Card>

          <div className="grid grid-cols-2 gap-4">
            {[...Array(4)].map((_, i) => (
              <Card key={i}>
                <CardContent className="p-4 flex items-center space-x-2">
                  <Skeleton className="h-5 w-5" />
                  <div className="flex-1">
                    <Skeleton className="h-4 w-3/4 mb-1" />
                    <Skeleton className="h-3 w-1/2" />
                  </div>
                </CardContent>
              </Card>
            ))}
          </div>

          <Card className="bg-yellow-50 border-yellow-200">
            <CardHeader className="pb-2">
              <Skeleton className="h-6 w-1/4" />
            </CardHeader>
            <CardContent>
              <Skeleton className="h-4 w-full" />
              <Skeleton className="h-4 w-3/4 mt-2" />
            </CardContent>
          </Card>

          <Card className="bg-gradient-to-r from-purple-400 to-pink-500">
            <CardHeader className="pb-2">
              <Skeleton className="h-6 w-1/4 bg-white/50" />
            </CardHeader>
            <CardContent>
              <Skeleton className="h-4 w-full bg-white/50" />
              <Skeleton className="h-4 w-3/4 mt-2 bg-white/50" />
            </CardContent>
          </Card>
        </CardContent>
      </Card>
    </div>
  )
}