declare global {
  interface Window {
    WxLogin?: (options: Record<string, unknown>) => void
  }
}

const TEAM_API = (import.meta.env.VITE_TEAM_API_URL || 'http://localhost:8000').replace(/\/+$/, '')
const WECHAT_APPID = import.meta.env.VITE_WECHAT_APPID || ''
const WECHAT_ORIGIN = (import.meta.env.VITE_WECHAT_LOGIN_ORIGIN || window.location.origin).replace(/\/+$/, '')
// 微信授权回调地址：默认落在当前域名的登录页；测试环境可用 VITE_WECHAT_CALLBACK_URL
// 指向已登记授权回调域的域名（如 laimiaoai.com）再中转回测试域名。
const WECHAT_CALLBACK_URL = import.meta.env.VITE_WECHAT_CALLBACK_URL || `${WECHAT_ORIGIN}/login/`

// 隐藏微信 iframe 自带的标题栏/状态栏，只保留二维码（与 tripcn.ai-web 登录页一致）
const LOGIN_QR_CSS =
  'data:text/css;base64,I3FyQ29kZUlmcmFtZSBpZnJhbWUgewogIHdpZHRoOiAxMDAlOwogIGhlaWdodDogMTAwJTsKICBvdmVyZmxvdzogaGlkZGVuOwp9Ci5pbXBvd2VyQm94IHsKICBkaXNwbGF5OiBmbGV4OwogIGp1c3RpZnktY29udGVudDogY2VudGVyOwogIGFsaWduLWl0ZW1zOiBjZW50ZXI7CiAgd2lkdGg6IDEwMCU7CiAgaGVpZ2h0OiAxMDAlOwp9Ci5pbXBvd2VyQm94IC5xcmNvZGUgewogIHdpZHRoOiAyMDBweDsKICBoZWlnaHQ6IDIwMHB4OwogIHBhZGRpbmc6IDBweDsKICBtYXJnaW46IGF1dG87CiAgYm9yZGVyOiBub25lOwp9Ci5pbXBvd2VyQm94IC50aXRsZSB7CiAgZGlzcGxheTogbm9uZTsKfQouaW1wb3dlckJveCAuaW5mbyB7CiAgZGlzcGxheTogbm9uZTsKfQouc3RhdHVzX2ljb24gewogIGRpc3BsYXk6IG5vbmU7Cn0KLmltcG93ZXJCb3ggLnN0YXR1cyB7CiAgZGlzcGxheTogbm9uZTsKfQ=='

interface WeixinLoginResponse {
  uid: string
  nickname: string
  avatar: string
  mobile: string
  introduce: string
  access_token: string
  open_token: string
  ret?: number
  msg?: string
}

interface TeamBasicInfo {
  team_id: string | number
  team_name: string
  enable_invite: number
  role: string
  score: number
}

const TEAM_STORAGE_KEY = 'team_id'
const TEAM_SCORE_KEY = 'team_score'

const qrEl = document.getElementById('qr') as HTMLElement

// 接口会返回未加引号的长整型 id，JSON.parse 会精度丢失甚至报错，先补引号
function parseApiJson<T>(text: string): T {
  return JSON.parse(text.replace(/(\[[,:]\s*)(\d{16,})(\s*[\],}])/g, '$1"$2"$3')) as T
}

function showQrMessage(message: string): void {
  if (qrEl) qrEl.textContent = message
}

function renderQrCode(): void {
  if (!WECHAT_APPID) {
    showQrMessage('缺少微信 AppID 配置')
    return
  }
  if (typeof window.WxLogin !== 'function') {
    showQrMessage('二维码加载失败，请刷新重试')
    return
  }
  qrEl.textContent = ''
  window.WxLogin({
    self_redirect: false,
    id: 'qr',
    appid: WECHAT_APPID,
    scope: 'snsapi_login',
    redirect_uri: encodeURIComponent(WECHAT_CALLBACK_URL),
    state: 'laimiao',
    href: LOGIN_QR_CSS,
  })
}

// 只接受站内绝对路径，避免 ?redirect= 被当作开放重定向
function consumePostLoginRedirect(): string {
  try {
    const stored = sessionStorage.getItem('post_login_redirect')
    if (stored && stored.startsWith('/') && !stored.startsWith('//')) {
      sessionStorage.removeItem('post_login_redirect')
      return stored
    }
  } catch (error) {
    console.warn('读取登录后跳转地址失败', error)
  }
  return ''
}

function redirectTarget(): string {
  const redirect = new URLSearchParams(window.location.search).get('redirect')
  if (redirect && redirect.startsWith('/') && !redirect.startsWith('//')) {
    try {
      sessionStorage.removeItem('post_login_redirect')
    } catch (error) {
      console.warn('清理登录后跳转地址失败', error)
    }
    return redirect
  }
  return consumePostLoginRedirect() || '/generate'
}

async function cacheTeam(token: string): Promise<void> {
  try {
    const res = await fetch(`${TEAM_API}/api/team/team_list`, {
      headers: { Authorization: token },
    })
    if (!res.ok) return
    const data = parseApiJson<{ ret?: number; msg?: string; data_list?: TeamBasicInfo[] }>(
      await res.text(),
    )
    if (data.ret !== undefined && data.ret !== 0) return

    const teams = data.data_list || []
    const personal =
      teams.find((team) => team.enable_invite === 0 && team.team_name === '我的') ||
      teams.find((team) => team.enable_invite === 0) ||
      teams[0]
    if (!personal) return

    localStorage.setItem(TEAM_STORAGE_KEY, String(personal.team_id))
    localStorage.setItem(TEAM_SCORE_KEY, String(personal.score ?? 0))
  } catch {
    // 团队信息预热失败不阻断登录
  }
}

async function completeWeixinLogin(code: string): Promise<void> {
  showQrMessage('正在登录…')
  try {
    const res = await fetch(`${TEAM_API}/api/user/weixin/login?code=${encodeURIComponent(code)}`, {
      headers: { 'Content-Type': 'application/json' },
    })
    if (!res.ok) throw new Error(`HTTP ${res.status}`)

    const data = parseApiJson<WeixinLoginResponse>(await res.text())
    if (data.ret !== undefined && data.ret !== 0) throw new Error(data.msg || '登录失败')

    localStorage.setItem('access_token', data.access_token)
    if (data.open_token) localStorage.setItem('open_token', data.open_token)
    localStorage.setItem(
      'user_info',
      JSON.stringify({
        uid: data.uid,
        nickname: data.nickname || '未知用户',
        avatar: data.avatar || '',
        mobile: data.mobile || '',
        introduce: data.introduce || '',
      }),
    )

    await cacheTeam(data.access_token)
    window.location.href = redirectTarget()
  } catch (error) {
    console.error('登录失败:', error)
    showQrMessage('登录失败，请刷新重试')
  }
}

const code = new URLSearchParams(window.location.search).get('code')
if (code) {
  void completeWeixinLogin(code)
} else {
  renderQrCode()
}