import { STORAGE_KEYS } from './config'

export interface TokenData {
  accessToken: string
  refreshToken: string
  expireTime: number
}

export function getAccessToken(): string {
  return wx.getStorageSync(STORAGE_KEYS.ACCESS_TOKEN) || ''
}

export function getRefreshToken(): string {
  return wx.getStorageSync(STORAGE_KEYS.REFRESH_TOKEN) || ''
}

export function getExpireTime(): number {
  return wx.getStorageSync(STORAGE_KEYS.EXPIRE_TIME) || 0
}

export function setTokens(data: TokenData): void {
  wx.setStorageSync(STORAGE_KEYS.ACCESS_TOKEN, data.accessToken)
  wx.setStorageSync(STORAGE_KEYS.REFRESH_TOKEN, data.refreshToken)
  wx.setStorageSync(STORAGE_KEYS.EXPIRE_TIME, data.expireTime)
}

export function clearTokens(): void {
  wx.removeStorageSync(STORAGE_KEYS.ACCESS_TOKEN)
  wx.removeStorageSync(STORAGE_KEYS.REFRESH_TOKEN)
  wx.removeStorageSync(STORAGE_KEYS.EXPIRE_TIME)
}

export function isLoggedIn(): boolean {
  return !!getAccessToken()
}

// token 过期提前量（秒）：提前 30s 视为过期，避免请求在途时刚好失效
const EXPIRE_LEAD_SECONDS = 30

/**
 * access token 是否已过期（仅用于请求前预刷新，不参与登录态判定）
 * expire_time 单位兼容秒与毫秒：数值大于 1e12 视为毫秒时间戳。
 */
export function isTokenExpired(): boolean {
  const expireTime = getExpireTime()
  if (!expireTime) return false // 未记录过期时间时不臆测，交给后端判定

  const isMillisecond = expireTime > 1e12
  const expireMs = isMillisecond ? expireTime : expireTime * 1000
  return Date.now() + EXPIRE_LEAD_SECONDS * 1000 >= expireMs
}

export function clearUserInfo(): void {
  wx.removeStorageSync(STORAGE_KEYS.USER_INFO)
}