'use client'

import { useEffect, useRef, useState } from 'react'

declare global {
  interface Window {
    dd?: any
  }
}

type DingtalkEntryClientProps = {
  corpId: string
  redirectPath: string
}

function loadDingtalkJsApi() {
  return new Promise<void>((resolve, reject) => {
    if (window.dd?.runtime?.permission) {
      resolve()
      return
    }

    const existing = document.querySelector<HTMLScriptElement>('script[data-dingtalk-jsapi="true"]')
    if (existing) {
      existing.addEventListener('load', () => resolve(), { once: true })
      existing.addEventListener('error', () => reject(new Error('钉钉JSAPI加载失败')), { once: true })
      return
    }

    const script = document.createElement('script')
    script.src = 'https://g.alicdn.com/dingding/dingtalk-jsapi/3.0.39/dingtalk.open.js'
    script.async = true
    script.dataset.dingtalkJsapi = 'true'
    script.onload = () => resolve()
    script.onerror = () => reject(new Error('钉钉JSAPI加载失败'))
    document.head.appendChild(script)
  })
}

function requestDingtalkAuthCode(corpId: string) {
  return new Promise<string>((resolve, reject) => {
    const dd = window.dd
    if (!dd?.ready || !dd?.runtime?.permission?.requestAuthCode) {
      reject(new Error('当前页面未检测到钉钉免登环境'))
      return
    }

    const timer = window.setTimeout(() => {
      reject(new Error('钉钉免登初始化超时'))
    }, 15000)

    if (dd.error) {
      dd.error((error: unknown) => {
        window.clearTimeout(timer)
        reject(error instanceof Error ? error : new Error(formatDingtalkError(error)))
      })
    }

    dd.ready(() => {
      window.clearTimeout(timer)
      dd.runtime.permission.requestAuthCode({
        corpId,
        onSuccess: (result: { code?: string }) => {
          const code = String(result?.code || '').trim()
          if (!code) {
            reject(new Error('钉钉未返回免登授权码'))
            return
          }
          resolve(code)
        },
        onFail: (error: unknown) => {
          reject(error instanceof Error ? error : new Error(formatDingtalkError(error)))
        },
      })
    })
  })
}

function formatDingtalkError(error: unknown) {
  if (!error) return '钉钉免登失败'
  if (typeof error === 'string') return error
  if (error instanceof Error) return error.message

  const record = error as Record<string, unknown>
  const message =
    record.message ||
    record.errorMessage ||
    record.errMsg ||
    record.errmsg ||
    record.submsg

  if (message) return String(message)

  try {
    return JSON.stringify(error)
  } catch {
    return String(error)
  }
}

function navigateDingtalkH5Login(authCode: string, redirectPath: string) {
  const params = new URLSearchParams({
    code: authCode,
    redirect: redirectPath,
    source: 'dingtalk-entry-v2',
  })

  window.location.replace(`/api/dingtalk/h5-login?${params.toString()}`)
}

async function hasActiveSession() {
  try {
    const response = await fetch('/api/auth/session', {
      cache: 'no-store',
      credentials: 'include',
    })
    if (!response.ok) return false
    const data = await response.json().catch(() => null)
    // 品牌中心外部人员也可能已经登录素材库；只有品牌中心成员才可跳过钉钉免登。
    return data?.user?.canAccessBrandCenter === true
  } catch {
    return false
  }
}

export default function DingtalkEntryClient({ corpId, redirectPath }: DingtalkEntryClientProps) {
  const startedRef = useRef(false)
  const [message, setMessage] = useState('正在打开页面...')

  useEffect(() => {
    if (startedRef.current) return
    startedRef.current = true

    const run = async () => {
      if (!corpId) {
        setMessage('请返回钉钉，从最新通知重新打开。')
        return
      }

      if (!/DingTalk/i.test(window.navigator.userAgent || '')) {
        setMessage('请在钉钉客户端内打开通知。')
        return
      }

      try {
        setMessage('正在打开页面...')
        // 绩效通知必须重新走 workNotice 免登，不能因为浏览器里已有素材库会话
        // 就直接打开普通会话。否则外部人员会被素材库会话带回默认素材库页面，
        // 也无法把本次通知对应的 surveyId/targetId 绑定到评分权限。
        const isPerformanceSurveyNotice = redirectPath === '/performance-survey'
          || redirectPath.startsWith('/performance-survey/')
        if (!isPerformanceSurveyNotice && await hasActiveSession()) {
          window.location.replace(redirectPath)
          return
        }

        await loadDingtalkJsApi()

        const authCode = await requestDingtalkAuthCode(corpId)

        navigateDingtalkH5Login(authCode, redirectPath)
      } catch (error) {
        console.error('[Dingtalk Entry] 打开页面失败:', error)
        setMessage('请返回钉钉，从最新通知重新打开。')
      }
    }

    void run()
  }, [corpId, redirectPath])

  return (
    <main className="min-h-[100dvh] overflow-hidden bg-white text-[#111827]">
      <div className="bg-black text-white">
        <div className="mx-auto flex h-16 max-w-[430px] items-center px-5">
          <div className="min-w-0">
            <div className="truncate text-[18px] font-semibold tracking-tight">由壹点「素材库」</div>
          </div>
        </div>
      </div>

      <section className="mx-auto max-w-[430px] px-5 py-8">
        <div className="overflow-hidden rounded-[26px] border border-[#e3eaf3] bg-white p-6 shadow-[0_18px_48px_rgba(15,23,42,0.10)]">
          <div className="text-[14px] font-semibold text-[#1677ff]">由壹点工作台</div>
          <h1 className="mt-3 text-[28px] font-semibold leading-tight tracking-[-0.01em] text-[#101828]">正在打开页面</h1>
          <p className="mt-3 text-[14px] font-medium leading-6 text-[#667085]">{message}</p>

          <div className="mt-6 rounded-[22px] bg-[#f6f8fb] p-4">
            <div className="flex items-center justify-between gap-4">
              <span className="text-[15px] font-semibold text-[#101828]">准备页面内容</span>
              <span className="text-[14px] font-semibold text-[#1677ff]">马上进入</span>
            </div>
            <div className="mt-4 h-1.5 overflow-hidden rounded-full bg-[#e8f1ff]">
              <div className="h-full w-2/3 animate-pulse rounded-full bg-[#1677ff]" />
            </div>
          </div>

          <div className="mt-7 rounded-[18px] border border-[#eef2f7] bg-white p-5">
            <div className="text-[15px] font-semibold text-[#7b8494]">业务工作台</div>
            <div className="mt-6 h-3 rounded-full bg-[#eef3f9]" />
            <div className="mt-3 h-3 w-3/4 rounded-full bg-[#eef3f9]" />
            <div className="mt-8 space-y-5">
              <div className="flex items-center gap-3">
                <span className="h-4 w-4 rounded-full border border-[#e3eaf3]" />
                <span className="h-3 flex-1 rounded-full bg-[#f1f5f9]" />
              </div>
              <div className="flex items-center gap-3">
                <span className="h-4 w-4 rounded-full border border-[#e3eaf3]" />
                <span className="h-3 flex-1 rounded-full bg-[#f1f5f9]" />
              </div>
              <div className="flex items-center gap-3">
                <span className="h-4 w-4 rounded-full border border-[#e3eaf3]" />
                <span className="h-3 w-2/3 rounded-full bg-[#f1f5f9]" />
              </div>
            </div>
          </div>
        </div>
      </section>
    </main>
  )
}