import { useEffect, useState } from 'react'
import Taro from '@tarojs/taro'
import { View, Image, Text, Button } from '@tarojs/components'
import { TenantId } from '@/config/app'
import { getWxOpenId } from '@/api/layout'
import { getUserInfo } from '@/api/layout'
import { saveStorageByLoginUser } from '@/utils/server'
import {
  checkAndHandleInviteRelation,
  hasPendingInvite,
  parseInviteParams,
  saveInviteParams,
  trackInviteSource,
} from '@/utils/invite'
import './login.scss'

interface GetPhoneNumberDetail {
  code?: string
  encryptedData?: string
  iv?: string
  errMsg?: string
}

interface GetPhoneNumberEvent {
  detail: GetPhoneNumberDetail
}

/** 同步判断当前是否是微信小程序环境 */
function detectIsWeapp(): boolean {
  try {
    return Taro.getEnv() === Taro.ENV_TYPE.WEAPP
  } catch {
    return process.env.TARO_ENV === 'weapp'
  }
}

const IS_WEAPP = detectIsWeapp()

/** 小程序登录获取 code */
async function getWeappLoginCode(): Promise<string | undefined> {
  try {
    const res = await new Promise<{ code?: string }>((resolve, reject) => {
      Taro.login({ success: (r) => resolve(r), fail: reject })
    })
    return res?.code
  } catch {
    return undefined
  }
}

/** 确保微信 openid 已保存到服务端 */
async function ensureWxOpenIdSaved() {
  try {
    if (Taro.getEnv() !== Taro.ENV_TYPE.WEAPP) return
  } catch {
    if (process.env.TARO_ENV !== 'weapp') return
  }

  const code = await getWeappLoginCode()
  if (!code) return

  try {
    await getWxOpenId({ code })
    const freshUser = await getUserInfo()
    if (freshUser) {
      const token = Taro.getStorageSync('access_token')
      saveStorageByLoginUser(token, freshUser)
    }
  } catch (e) {
    console.error('登录后绑定 openid 失败:', e)
  }
}

/** 获取用户信息 */
async function fetchUserInfo(token: string) {
  try {
    const serverUrl = 'https://server.websoft.top'
    const res: any = await Taro.request({
      url: `${serverUrl}/api/auth/user`,
      method: 'GET',
      header: {
        'Authorization': `Bearer ${token}`,
        'content-type': 'application/json',
        TenantId: String(TenantId),
      },
    })

    if (res.data?.code === 0 && res.data?.data) {
      return res.data.data
    }
    return null
  } catch (e) {
    console.error('获取用户信息失败:', e)
    return null
  }
}

const Login = () => {
  const [isAgree, setIsAgree] = useState(false)
  const [loading, setLoading] = useState(false)
  const [showContent, setShowContent] = useState(false)

  const router = Taro.getCurrentInstance().router
  const isWeapp = IS_WEAPP

  /** 页面加载动画 */
  useEffect(() => {
    setTimeout(() => setShowContent(true), 100)
  }, [])

  /** 解析 redirect 参数 */
  const redirectUrl = (() => {
    const raw = (router?.params as Record<string, string> | undefined)?.redirect
    if (!raw) return ''
    try {
      const decoded = decodeURIComponent(raw)
      return decoded.startsWith('/') ? decoded : `/${decoded}`
    } catch {
      return raw.startsWith('/') ? raw : `/${raw}`
    }
  })()

  /** 处理邀请参数 */
  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('登录页处理邀请参数失败:', e)
    }
  }, [router?.params])

  /** 登录成功后跳转 */
  const navigateAfterLogin = async () => {
    if (!redirectUrl) {
      await Taro.reLaunch({ url: '/pages/index/index' })
      return
    }

    const tabBarUrls = [
      '/pages/index/index',
      '/pages/shop/index',
      '/pages/points/index',
      '/pages/user/user',
    ]
    const pure = redirectUrl.split('?')[0]

    if (tabBarUrls.includes(pure)) {
      await Taro.switchTab({ url: pure })
      return
    }

    await Taro.redirectTo({ url: redirectUrl })
  }

  /** 手机号快捷登录 */
  const handleGetPhoneNumber = async ({ detail }: GetPhoneNumberEvent) => {
    if (!isAgree) {
      Taro.showToast({ title: '请先勾选同意协议', icon: 'none' })
      return
    }
    if (loading) return

    const { code: phoneCode, errMsg } = detail || {}
    if (!phoneCode || (errMsg && errMsg.includes('fail'))) {
      Taro.showToast({ title: '未授权手机号', icon: 'none' })
      return
    }

    try {
      setLoading(true)

      const inviteParams = parseInviteParams({ query: router?.params })
      const refereeId = inviteParams?.inviter ? parseInt(inviteParams.inviter, 10) : 0

      const serverUrl = 'https://server.websoft.top'
      const res: any = await Taro.request({
        url: `${serverUrl}/api/wx-login/loginByMpWxPhone`,
        method: 'POST',
        data: {
          code: phoneCode,
          notVerifyPhone: true,
          refereeId,
          sceneType: 'save_referee',
          tenantId: Number(TenantId),
        },
        header: { 'content-type': 'application/json', TenantId: String(TenantId) },
      })

      if (res.data?.code === 0 && res.data?.data?.access_token) {
        const token = res.data.data.access_token
        let user = res.data.data.user

        // 获取最新的用户信息
        const freshUserInfo = await fetchUserInfo(token)
        if (freshUserInfo) {
          user = freshUserInfo
        }

        saveStorageByLoginUser(token, user)

        // 绑定 openid + 处理邀请关系
        await ensureWxOpenIdSaved()
        if (hasPendingInvite()) {
          try { await checkAndHandleInviteRelation() } catch (e) { console.error(e) }
        }

        Taro.showToast({ title: '登录成功', icon: 'success' })
        setTimeout(() => navigateAfterLogin(), 800)
      } else {
        Taro.showToast({ title: res.data?.message || '登录失败', icon: 'none' })
      }
    } catch (e: any) {
      console.error('微信登录失败:', e)
      Taro.showToast({ title: e?.message || '登录失败', icon: 'none' })
    } finally {
      setLoading(false)
    }
  }

  return (
    <View className={`page-login ${showContent ? 'page-login--show' : ''}`}>
      {/* 渐变背景 */}
      <View className='login-bg'>
        <View className='login-bg__gradient' />
        <View className='login-bg__circle login-bg__circle--1' />
        <View className='login-bg__circle login-bg__circle--2' />
        <View className='login-bg__circle login-bg__circle--3' />
      </View>

      {/* 主要内容区域 */}
      <View className='login-content'>
        {/* Logo 和标题 */}
        <View className='login-header'>
          <Text className='login-title'>欢迎来到鑫龙家电</Text>
          <Text className='login-subtitle'>登录后享受更多精彩功能</Text>
        </View>

        {/* 登录按钮区域 */}
        <View className='login-body'>
          {isWeapp && (
            <View className='login-methods'>

              <Button
                className='login-btn'
                style={{
                  background: 'linear-gradient(135deg, #07c160, #06ad56)',
                  border: 'none',
                  borderRadius: '48px',
                  display: 'flex',
                  alignItems: 'center',
                  justifyContent: 'center',
                  color: '#ffffff',
                  fontWeight: '600',
                  textAlign: 'center',
                  opacity: (!isAgree || loading) ? 0.5 : 1,
                  margin: 0,
                  padding: 0,
                }}
                openType='getPhoneNumber'
                onGetPhoneNumber={handleGetPhoneNumber}
                disabled={!isAgree || loading}
                loading={loading}
              >
                  手机号快捷登录
              </Button>

                <View className='login-methods__tip text-gray-200'>
                    <Text>点击上方按钮，快速登录</Text>
                </View>

              <View className='login-methods__divider'>
                <View className='divider-line' />
                <Text className='divider-text'>安全快捷</Text>
                <View className='divider-line' />
              </View>

              <View className='login-features'>
                <View className='feature-item'>
                  <Text className='feature-icon'>🔒</Text>
                  <Text className='feature-text'>安全可靠</Text>
                </View>
                <View className='feature-item'>
                  <Text className='feature-icon'>⚡</Text>
                  <Text className='feature-text'>一键登录</Text>
                </View>
                <View className='feature-item'>
                  <Text className='feature-icon'>🎁</Text>
                  <Text className='feature-text'>专属福利</Text>
                </View>
              </View>
            </View>
          )}

          {/* 非微信小程序环境提示 */}
          {!isWeapp && (
            <View className='login-non-weapp'>
              <View className='non-weapp-icon'>💻</View>
              <Text className='non-weapp-title'>请在微信小程序中打开</Text>
              <Text className='non-weapp-desc'>当前环境不支持手机号快捷登录，请在微信小程序中使用完整功能</Text>
            </View>
          )}
        </View>

        {/* 协议勾选 - 自定义实现 */}
        <View className='login-footer'>
          <View className='login-agreement' onClick={() => setIsAgree(!isAgree)}>
            <View className={`login-agreement__checkbox ${isAgree ? 'login-agreement__checkbox--checked' : ''}`}>
              {isAgree && <Text className='login-agreement__check'>✓</Text>}
            </View>
            <Text className='login-agreement__text'>
              {'我已阅读并同意'}
              <Text className='link' onClick={(e) => { e.stopPropagation(); Taro.navigateTo({ url: '/passport/agreement?type=terms' }) }}>
                {'《用户协议》'}
              </Text>
              {'和'}
              <Text className='link' onClick={(e) => { e.stopPropagation(); Taro.navigateTo({ url: '/passport/agreement?type=privacy' }) }}>
                {'《隐私政策》'}
              </Text>
            </Text>
          </View>
        </View>
      </View>
    </View>
  )
}

export default Login
