import {useEffect, useState} from "react";
import Taro from '@tarojs/taro'
import { View } from '@tarojs/components'
import {Input, Button} from '@nutui/nutui-react-taro'
import {loginBySms, sendSmsCaptcha} from "@/api/passport/login";
import {LoginParam} from "@/api/passport/login/model";
import {checkAndHandleInviteRelation, hasPendingInvite, parseInviteParams, saveInviteParams, trackInviteSource} from "@/utils/invite";

const SmsLogin = () => {
  const [loading, setLoading] = useState<boolean>(false)
  const [sendingCode, setSendingCode] = useState<boolean>(false)
  const [countdown, setCountdown] = useState<number>(0)
  const [formData, setFormData] = useState<LoginParam>({
    phone: '',
    code: ''
  })

  const router = Taro.getCurrentInstance().router
  const redirectParam = (router?.params as any)?.redirect as string | undefined

  const safeDecodeMaybeEncoded = (input?: string) => {
    if (!input) return ''
    try {
      return decodeURIComponent(input)
    } catch (_e) {
      return input
    }
  }

  const redirectUrl = (() => {
    const decoded = safeDecodeMaybeEncoded(redirectParam)
    if (!decoded) return ''
    return decoded.startsWith('/') ? decoded : `/${decoded}`
  })()

  const isTabBarUrl = (url: string) => {
    const pure = url.split('?')[0]
    return (
      pure === '/pages/index/index' ||
      pure === '/pages/cart/cart' ||
      pure === '/pages/user/user' ||
      pure === '/pages/category/index'
    )
  }

  const navigateAfterLogin = async () => {
    if (!redirectUrl) {
      await Taro.reLaunch({ url: '/pages/index/index' })
      return
    }
    if (isTabBarUrl(redirectUrl)) {
      await Taro.switchTab({ url: redirectUrl.split('?')[0] })
      return
    }
    await Taro.redirectTo({ url: redirectUrl })
  }

  const reload = () => {
    // sms-login 页面不是 tabBar 页面，无需调用 hideTabBar
  }

  useEffect(() => {
    reload()
  }, [])

  // 如果从分享/二维码链接进入短信登录页，先暂存邀请信息
  useEffect(() => {
    try {
      const inviteParams = parseInviteParams({ query: router?.params })
      if (inviteParams?.inviter) {
        saveInviteParams(inviteParams)
        trackInviteSource(inviteParams.source || 'share', parseInt(inviteParams.inviter, 10))
      }
    } catch (e) {
      console.error('短信登录页处理邀请参数失败:', e)
    }
  }, [router?.params])

  // 倒计时效果
  useEffect(() => {
    let timer: NodeJS.Timeout
    if (countdown > 0) {
      timer = setTimeout(() => {
        setCountdown(countdown - 1)
      }, 1000)
    }
    return () => {
      if (timer) clearTimeout(timer)
    }
  }, [countdown])

  // 验证手机号格式
  const validatePhone = (phone: string): boolean => {
    const phoneRegex = /^1[3-9]\d{9}$/
    return phoneRegex.test(phone)
  }

  // 发送短信验证码
  const handleSendCode = async () => {
    if (!formData.phone) {
      Taro.showToast({
        title: '请输入手机号码',
        icon: 'none'
      })
      return
    }

    if (!validatePhone(formData.phone)) {
      Taro.showToast({
        title: '请输入正确的手机号码',
        icon: 'none'
      })
      return
    }

    if (sendingCode || countdown > 0) {
      return
    }

    try {
      setSendingCode(true)
      await sendSmsCaptcha({ phone: formData.phone })

      Taro.showToast({
        title: '验证码已发送',
        icon: 'success'
      })

      // 开始60秒倒计时
      setCountdown(60)
    } catch (error: any) {
      Taro.showToast({
        title: error.message || '发送失败',
        icon: 'error'
      })
    } finally {
      setSendingCode(false)
    }
  }

  // 处理登录
  const handleLogin = async () => {
    // 防止重复提交
    if (loading) {
      return
    }

    // 表单验证
    if (!formData.phone) {
      Taro.showToast({
        title: '请输入手机号码',
        icon: 'none'
      })
      return
    }

    if (!validatePhone(formData.phone)) {
      Taro.showToast({
        title: '请输入正确的手机号码',
        icon: 'none'
      })
      return
    }

    if (!formData.code) {
      Taro.showToast({
        title: '请输入验证码',
        icon: 'none'
      })
      return
    }

    if (formData.code.length !== 6) {
      Taro.showToast({
        title: '请输入6位验证码',
        icon: 'none'
      })
      return
    }

    try {
      setLoading(true)

      await loginBySms({
        phone: formData.phone,
        code: formData.code
      })

      // 登录成功后（可能是新注册用户），检查是否存在待处理的邀请关系并尝试绑定
      if (hasPendingInvite()) {
        try {
          await checkAndHandleInviteRelation()
        } catch (e) {
          console.error('短信登录后处理邀请关系失败:', e)
        }
      }

      Taro.showToast({
        title: '登录成功',
        icon: 'success'
      })

      // 延迟跳转到首页
      setTimeout(() => {
        navigateAfterLogin().catch((e) => {
          console.error('短信登录后跳转失败:', e)
          Taro.reLaunch({ url: '/pages/index/index' })
        })
      }, 1500)

    } catch (error: any) {
      Taro.showToast({
        title: error.message || '登录失败',
        icon: 'error'
      })
    } finally {
      setLoading(false)
    }
  }

  return (
    <>
      <View className='flex flex-col justify-center px-5 pt-3'>
        <View className='flex flex-col justify-between items-center my-2'>
          <Input
            type='number'
            placeholder='请输入手机号码'
            maxLength={11}
            value={formData.phone}
            onChange={(value) => setFormData({...formData, phone: value})}
            style={{backgroundColor: '#ffffff', borderRadius: '8px'}}
          />
        </View>
        <View className='flex justify-between items-center bg-white rounded-lg my-2 pr-2'>
          <Input
            type='number'
            placeholder='请输入6位验证码'
            maxLength={6}
            value={formData.code}
            onChange={(value) => setFormData({...formData, code: value})}
            style={{ backgroundColor: '#ffffff', borderRadius: '8px'}}
          />
          <Button
            size='small'
            type={countdown > 0 ? "default" : "primary"}
            loading={sendingCode}
            disabled={sendingCode || countdown > 0}
            onClick={handleSendCode}
          >
            {countdown > 0 ? `${countdown}s` : sendingCode ? '发送中...' : '获取验证码'}
          </Button>
        </View>
        <View className='flex justify-center my-5'>
          <Button
            type='info'
            size='large'
            className='w-full rounded-lg p-2'
            loading={loading}
            disabled={loading}
            onClick={handleLogin}
          >
            {loading ? '登录中...' : '登录'}
          </Button>
        </View>
      </View>
    </>
  )
}
export default SmsLogin