const WORKER_TOKEN_KEY = 'order-site-worker-token'
const WORKER_EXPIRES_AT_KEY = 'order-site-worker-token-expires-at'
const WORKER_ID_KEY = 'order-site-worker-id'
const WORKER_USERNAME_KEY = 'order-site-worker-username'
const WORKER_STATUS_KEY = 'order-site-worker-status'
const WORKER_DEVICE_ID_KEY = 'order-site-worker-device-id'

const WORKER_SESSION_STORAGE_KEYS = new Set([
  WORKER_TOKEN_KEY,
  WORKER_EXPIRES_AT_KEY,
  WORKER_ID_KEY,
  WORKER_USERNAME_KEY,
  WORKER_STATUS_KEY,
])

export function getWorkerToken() {
  return localStorage.getItem(WORKER_TOKEN_KEY) || ''
}

export function getWorkerDeviceId() {
  let deviceId = localStorage.getItem(WORKER_DEVICE_ID_KEY) || ''
  if (!deviceId) {
    deviceId =
      typeof crypto.randomUUID === 'function'
        ? crypto.randomUUID()
        : `${Date.now()}-${Math.random().toString(36).slice(2)}`
    localStorage.setItem(WORKER_DEVICE_ID_KEY, deviceId)
  }
  return deviceId
}

export function getWorkerTokenExpiresAt() {
  return localStorage.getItem(WORKER_EXPIRES_AT_KEY) || ''
}

export function getWorkerId() {
  const value = Number(localStorage.getItem(WORKER_ID_KEY) || 0)
  return Number.isFinite(value) && value > 0 ? value : 0
}

export function getWorkerUsername() {
  return localStorage.getItem(WORKER_USERNAME_KEY) || ''
}

export function getWorkerStatus() {
  return localStorage.getItem(WORKER_STATUS_KEY) || ''
}

export function setWorkerSession(
  token: string,
  expiresAt: string,
  worker?: { workerId: number; username: string; status: string },
) {
  localStorage.setItem(WORKER_TOKEN_KEY, token)
  localStorage.setItem(WORKER_EXPIRES_AT_KEY, expiresAt)

  if (worker?.workerId) {
    localStorage.setItem(WORKER_ID_KEY, String(worker.workerId))
  }
  if (worker?.username) {
    localStorage.setItem(WORKER_USERNAME_KEY, worker.username)
  }
  if (worker?.status) {
    localStorage.setItem(WORKER_STATUS_KEY, worker.status)
  }
}

export function clearWorkerSession() {
  localStorage.removeItem(WORKER_TOKEN_KEY)
  localStorage.removeItem(WORKER_EXPIRES_AT_KEY)
  localStorage.removeItem(WORKER_ID_KEY)
  localStorage.removeItem(WORKER_USERNAME_KEY)
  localStorage.removeItem(WORKER_STATUS_KEY)
}

/** 清理失效会话并通知当前标签页，避免并发请求各自重复跳转。 */
export function expireWorkerSession() {
  const hadSession = Boolean(getWorkerToken() || getWorkerTokenExpiresAt())
  clearWorkerSession()
  if (hadSession && typeof window !== 'undefined') {
    window.dispatchEvent(new Event('worker-session-expired'))
  }
  return hadSession
}

export function isWorkerSessionStorageKey(key: string | null) {
  return Boolean(key && WORKER_SESSION_STORAGE_KEYS.has(key))
}

export function getWorkerSessionExpiryDelay(expiresAt: string, now = Date.now()) {
  if (!expiresAt) return null
  const expiresAtMs = Date.parse(expiresAt)
  if (!Number.isFinite(expiresAtMs)) return null
  return Math.max(0, expiresAtMs - now)
}

export function hasWorkerSession() {
  const token = getWorkerToken()
  const expiresAt = getWorkerTokenExpiresAt()
  if (!token) return false
  if (isExpired(expiresAt)) {
    clearWorkerSession()
    return false
  }
  return true
}

function isExpired(expiresAt: string) {
  const delay = getWorkerSessionExpiryDelay(expiresAt)
  return delay !== null && delay <= 0
}