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'

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

export default function QRCodeLogin({ visible, onClose }: QRCodeLoginProps) {
  const navigate = useNavigate()
  const [qrcodeUrl, setQrcodeUrl] = useState('')
  const [sessionId, setSessionId] = useState('')
  const [status, setStatus] = useState<'loading' | 'pending' | 'scanning' | 'success' | 'expired'>('loading')
  const pollTimerRef = useRef<NodeJS.Timeout | null>(null)

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

    return () => {
      if (pollTimerRef.current) {
        clearTimeout(pollTimerRef.current)
      }
    }
  }, [visible])

  const initQrcodeLogin = async () => {
    setStatus('loading')
    try {
      // 生成登录二维码
      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) {
        setQrcodeUrl(result.data.auth_url)
        setSessionId(result.data.session_id)
        setStatus('pending')
        // 开始轮询登录状态
        startPolling(result.data.session_id)
      } else {
        Toast.show(result.message || '生成二维码失败')
        setStatus('expired')
      }
    } catch (error) {
      console.error('生成二维码失败:', error)
      Toast.show('生成二维码失败')
      setStatus('expired')
    }
  }

  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 === 'expired') {
            setStatus('expired')
            Toast.show('二维码已过期，请刷新重试')
          } 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 if (result.message?.includes('过期')) {
          setStatus('expired')
        } 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！'
      case 'expired':
        return '二维码已过期'
      default:
        return ''
    }
  }

  const getStatusColor = () => {
    switch (status) {
      case 'pending':
        return '#1677ff'
      case 'scanning':
        return '#faad14'
      case 'success':
        return '#52c41a'
      case 'expired':
        return '#ff4d4f'
      default:
        return '#999'
    }
  }

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

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

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

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

              {(status === 'expired') && (
                <div className={styles.actions}>
                  <button className={styles.refreshBtn} onClick={handleRefresh}>
                    刷新二维码
                  </button>
                </div>
              )}
            </>
          )}
        </div>
      }
      onClose={onClose}
      closeOnMaskClick={status !== 'scanning' && status !== 'success'}
    />
  )
}