import { useState, useEffect, useRef } from 'react'
import { Dialog, Toast } from 'antd-mobile'
import { QRCodeSVG } from 'qrcode.react'
import { useNavigate } from 'react-router-dom'
import styles from './QRCodeLogin.module.css'

// 声明飞书 QR SDK 类型
declare global {
  interface Window {
    QR?: (config: {
      id: string
      goto: string
      width?: string
      height?: string
    }) => {
      matchOrigin: (origin: string) => boolean
      matchData: (data: any) => boolean
    }
  }
}

interface QRCodeLoginProps {
  visible: boolean
  onClose: () => void
}

// 动态加载飞书 QR SDK
const loadFeishuQRSDK = (): Promise<boolean> => {
  return new Promise((resolve) => {
    // 检查是否已经加载
    if (window.QR) {
      console.log('✅ Feishu QR SDK already loaded')
      resolve(true)
      return
    }

    console.log('📦 Loading Feishu QR SDK...')

    const script = document.createElement('script')
    script.id = 'feishu-qr-sdk'
    script.src = 'https://lf-package-cn.feishucdn.com/obj/feishu-static/lark/passport/qrcode/LarkSSOSDKWebQRCode-1.0.3.js'
    script.async = true
    script.timeout = 5000 // 5秒超时

    const timeoutId = setTimeout(() => {
      console.warn('⚠️ Feishu QR SDK load timeout, using fallback')
      resolve(false)
    }, 5000)

    script.onload = () => {
      clearTimeout(timeoutId)
      setTimeout(() => {
        if (window.QR) {
          console.log('✅ Feishu QR SDK loaded successfully')
          resolve(true)
        } else {
          console.warn('⚠️ QR SDK loaded but window.QR not found, using fallback')
          resolve(false)
        }
      }, 100)
    }

    script.onerror = () => {
      clearTimeout(timeoutId)
      console.warn('⚠️ Failed to load Feishu QR SDK, using fallback')
      resolve(false) // 不 reject，而是返回 false 使用降级方案
    }

    document.head.appendChild(script)
  })
}

export default function QRCodeLogin({ visible, onClose }: QRCodeLoginProps) {
  const navigate = useNavigate()
  const [status, setStatus] = useState<'loading' | 'pending' | 'scanning' | 'success'>('loading')
  const [useFallback, setUseFallback] = useState(false)
  const [qrcodeUrl, setQrcodeUrl] = useState('')
  const qrContainerRef = useRef<HTMLDivElement>(null)
  const qrObjRef = useRef<any>(null)
  const pollTimerRef = useRef<NodeJS.Timeout | null>(null)
  const sessionIdRef = useRef<string>('')

  useEffect(() => {
    if (visible) {
      initQRCode()
    }

    return () => {
      // 清理
      if (qrContainerRef.current) {
        qrContainerRef.current.innerHTML = ''
      }
      if (pollTimerRef.current) {
        clearTimeout(pollTimerRef.current)
      }
      // 重置状态
      setUseFallback(false)
      setQrcodeUrl('')
    }
  }, [visible])

  const initQRCode = async () => {
    setStatus('loading')
    setUseFallback(false)
    setQrcodeUrl('')

    try {
      // 尝试加载飞书 QR SDK
      const sdkLoaded = await loadFeishuQRSDK()

      // 生成登录会话
      const response = await fetch('/api/v1/auth/qrcode-login', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          tenant_key: '14e7bc0fe5985740',
        }),
      })

      const result = await response.json()

      if (result.code === 0) {
        const authUrl = result.data.auth_url
        sessionIdRef.current = result.data.session_id

        if (sdkLoaded && window.QR) {
          // 使用飞书官方 QR SDK
          if (qrContainerRef.current) {
            qrContainerRef.current.innerHTML = ''
          }

          qrObjRef.current = window.QR({
            id: 'feishu-qrcode-container',
            goto: authUrl,
            width: '200',
            height: '200',
          })

          setStatus('pending')
          startPolling(result.data.session_id)
        } else {
          // SDK 加载失败，使用普通二维码
          console.log('📱 Using fallback QR code')
          setQrcodeUrl(authUrl)
          setUseFallback(true)
          setStatus('pending')
          startPolling(result.data.session_id)
        }
      } else {
        Toast.show(result.message || '生成二维码失败')
      }
    } catch (error) {
      console.error('生成二维码失败:', error)
      Toast.show('生成二维码失败')
    }
  }

  const startPolling = (id: string) => {
    const poll = async () => {
      try {
        const response = await fetch(`/api/v1/auth/qrcode-login/status?session_id=${id}`)
        const result = await response.json()

        if (result.code === 0) {
          if (result.data.status === 'success') {
            setStatus('success')
            // 登录成功，保存 token
            const { token, user } = result.data
            localStorage.setItem('token', token)
            localStorage.setItem('i18nextLng', 'zh')
            // 触发登录成功事件，让 store 更新
            window.dispatchEvent(new CustomEvent('feishu-login-success', { detail: { user, token } }))

            Toast.show('登录成功')
            setTimeout(() => {
              onClose()
              navigate('/dashboard')
            }, 500)
          } else if (result.data.status === 'scanning') {
            setStatus('scanning')
            // 继续轮询
            pollTimerRef.current = setTimeout(poll, 2000)
          } else {
            // pending，继续轮询
            pollTimerRef.current = setTimeout(poll, 2000)
          }
        } else {
          // 继续轮询
          pollTimerRef.current = setTimeout(poll, 2000)
        }
      } catch (error) {
        console.error('轮询登录状态失败:', error)
        // 继续轮询
        pollTimerRef.current = setTimeout(poll, 2000)
      }
    }

    pollTimerRef.current = setTimeout(poll, 2000)
  }

  const getStatusText = () => {
    switch (status) {
      case 'loading':
        return '正在生成二维码...'
      case 'pending':
        return '请使用飞书扫码登录'
      case 'scanning':
        return '已扫码，请在手机上确认'
      case 'success':
        return '登录成功！'
      default:
        return ''
    }
  }

  const getStatusColor = () => {
    switch (status) {
      case 'pending':
        return '#1677ff'
      case 'scanning':
        return '#faad14'
      case 'success':
        return '#52c41a'
      default:
        return '#999'
    }
  }

  const handleRefresh = () => {
    if (pollTimerRef.current) {
      clearTimeout(pollTimerRef.current)
    }
    initQRCode()
  }

  return (
    <Dialog
      visible={visible}
      content={
        <div className={styles.qrcodeContainer}>
          {status === 'loading' && <div className={styles.loading}>正在生成二维码...</div>}

          {useFallback && qrcodeUrl && (
            <>
              <div className={styles.qrcode}>
                <QRCodeSVG
                  value={qrcodeUrl}
                  size={200}
                  level="M"
                  includeMargin={false}
                />
              </div>

              <div className={styles.status} style={{ color: getStatusColor() }}>
                {getStatusText()}
              </div>

              <p className={styles.tip} style={{ fontSize: '12px', color: '#999' }}>
                💡 使用飞书扫码登录
              </p>
            </>
          )}

          {!useFallback && status !== 'loading' && (
            <>
              <div id="feishu-qrcode-container" ref={qrContainerRef} className={styles.qrcode}></div>

              <div className={styles.status} style={{ color: getStatusColor() }}>
                {getStatusText()}
              </div>

              <p className={styles.tip}>
                💡 打开飞书 APP，扫一扫登录
              </p>
            </>
          )}
        </div>
      }
      onClose={onClose}
      closeOnMaskClick={status !== 'scanning' && status !== 'success'}
    />
  )
}