import { API_BASE_URL, GOOGLE_CLIENT_ID, toast } from '../main'
import { setToken, loadCurrentUser } from './auth'
import { registerPush } from './push'
import { WEBSITE_BASE_URL } from '../constants'

export async function googleGetIdToken() {
  return new Promise((resolve, reject) => {
    if (!window.google || !GOOGLE_CLIENT_ID) {
      toast.error('Google 登录不可用, 请检查网络设置与VPN')
      reject()
      return
    }
    window.google.accounts.id.initialize({
      client_id: GOOGLE_CLIENT_ID,
      callback: ({ credential }) => resolve(credential),
      use_fedcm: true 
    })
    window.google.accounts.id.prompt()
  })
}

export function googleAuthorize() {
  if (!GOOGLE_CLIENT_ID) {
    toast.error('Google 登录不可用, 请检查网络设置与VPN')
    return
  }
  const redirectUri = `${WEBSITE_BASE_URL}/google-callback`
  const nonce = Math.random().toString(36).substring(2)
  const url = `https://accounts.google.com/o/oauth2/v2/auth?client_id=${GOOGLE_CLIENT_ID}&redirect_uri=${encodeURIComponent(redirectUri)}&response_type=id_token&scope=openid%20email%20profile&nonce=${nonce}`
  window.location.href = url
}

export async function googleAuthWithToken(idToken, redirect_success, redirect_not_approved) {
  try {
    const res = await fetch(`${API_BASE_URL}/api/auth/google`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ idToken })
    })
    const data = await res.json()
    if (res.ok && data.token) {
      setToken(data.token)
      await loadCurrentUser()
      toast.success('登录成功')
      registerPush()
      if (redirect_success) redirect_success()
    } else if (data.reason_code === 'NOT_APPROVED') {
      toast.info('当前为注册审核模式，请填写注册理由')
      if (redirect_not_approved) redirect_not_approved(data.token)
    } else if (data.reason_code === 'IS_APPROVING') {
      toast.info('您的注册理由正在审批中')
      if (redirect_success) redirect_success()
    }
  } catch (e) {
    toast.error('登录失败')
  }
}

export async function googleSignIn(redirect_success, redirect_not_approved) {
  try {
    const token = await googleGetIdToken()
    await googleAuthWithToken(token, redirect_success, redirect_not_approved)
  } catch {
    /* ignore */
  }
}

import router from '../router'

export function loginWithGoogle() {
  googleSignIn(
    () => {
      router.push('/')
    },
    token => {
      router.push('/signup-reason?token=' + token)
    }
  )
}