/** 本地登录会话（无网络依赖，供 request / auth 共用，避免循环引用） */

const TOKEN_KEY = 'zkxw_mobile_token'
const REFRESH_TOKEN_KEY = 'zkxw_mobile_refresh_token'
const USER_KEY = 'zkxw_mobile_user'
const RETURN_URL_KEY = 'zkxw_mobile_return_url'

export function setReturnUrl(url) {
  try {
    uni.setStorageSync(RETURN_URL_KEY, url || '')
  } catch (e) {
    /* ignore */
  }
}

export function takeReturnUrl() {
  try {
    const u = uni.getStorageSync(RETURN_URL_KEY) || ''
    uni.removeStorageSync(RETURN_URL_KEY)
    return typeof u === 'string' ? u : ''
  } catch (e) {
    return ''
  }
}

export function getToken() {
  try {
    return uni.getStorageSync(TOKEN_KEY) || ''
  } catch (e) {
    return ''
  }
}

export function getRefreshToken() {
  try {
    return uni.getStorageSync(REFRESH_TOKEN_KEY) || ''
  } catch (e) {
    return ''
  }
}

export function isLoggedIn() {
  return !!getToken()
}

export function getUser() {
  try {
    const raw = uni.getStorageSync(USER_KEY)
    return raw ? JSON.parse(raw) : null
  } catch (e) {
    return null
  }
}

export function clearSession() {
  try {
    uni.removeStorageSync(TOKEN_KEY)
    uni.removeStorageSync(REFRESH_TOKEN_KEY)
    uni.removeStorageSync(USER_KEY)
  } catch (e) {
    /* ignore */
  }
}

export function saveSession({ token, refreshToken, userInfo }) {
  uni.setStorageSync(TOKEN_KEY, token || '')
  uni.setStorageSync(REFRESH_TOKEN_KEY, refreshToken || '')
  uni.setStorageSync(USER_KEY, JSON.stringify(userInfo || null))
}

/** 更新本地缓存的用户信息（保留 token）。 */
export function updateStoredUser(userInfo) {
  try {
    uni.setStorageSync(USER_KEY, JSON.stringify(userInfo || null))
  } catch (e) {
    /* ignore */
  }
}

let _reloginPending = false

function isOnLoginPage() {
  try {
    const pages = getCurrentPages()
    const cur = pages && pages[pages.length - 1]
    const route = (cur && cur.route) || ''
    return String(route).indexOf('pages/login') !== -1
  } catch (e) {
    return false
  }
}

/**
 * Token 失效：清本地会话并回到登录页（防抖，避免并发 401 连跳）。
 * @param {string} [message]
 * @param {string} [returnUrl] 登录成功后回跳路径（写入本地，登录页 takeReturnUrl）
 */
export function forceRelogin(message, returnUrl) {
  if (_reloginPending) return
  if (typeof returnUrl === 'string' && returnUrl.trim()) {
    setReturnUrl(returnUrl.trim())
  }
  clearSession()
  if (isOnLoginPage()) return
  _reloginPending = true
  const title =
    (typeof message === 'string' && message.trim()) ||
    '登录已失效，请重新登录'
  uni.showToast({ title, icon: 'none', duration: 2000 })
  setTimeout(() => {
    uni.reLaunch({
      url: '/pages/login/index',
      complete() {
        _reloginPending = false
      },
      fail() {
        _reloginPending = false
      }
    })
  }, 400)
}