/** 上游员工状态码。5 已离职，2 试用、3 正式均视为在职。 */
const STATUS_CODE_RESIGNED = 5
const STATUS_CODE_ACTIVE = [2, 3]
const RESIGNED_STATUS_KEYWORDS = ['离职', '停用', '退休']

export const EMPLOYMENT_STATE = {
  ACTIVE: 'ACTIVE',
  RESIGNED: 'RESIGNED',
  UNKNOWN: 'UNKNOWN',
} as const

function clean(value: unknown): string | null {
  if (value === null || value === undefined) return null
  const normalized = String(value).trim()
  return normalized === '' ? null : normalized
}

/**
 * 将各上游来源的明确信号归一成系统使用的在职状态。
 *
 * 花名册里有一批离职人员没有钉钉 userid：其 employmentStatus 已明确为「离职」，
 * 但旧逻辑只在 userid 存在时查询离职表/注册表，最终把这些人保守落成 UNKNOWN。
 * 明确的离职信号必须优先于在职状态码；其余模糊中文和空值仍保持 UNKNOWN。
 */
export function resolveEmploymentState(signals: {
  hasResignationRecord: boolean
  rawEmploymentStatus?: unknown
  registeredStatusCode?: number | null
}): string {
  const rawStatus = clean(signals.rawEmploymentStatus)
  const rawStatusCode = rawStatus ? Number(rawStatus) : Number.NaN
  const rawExplicitlyResigned = Boolean(
    rawStatus &&
      (rawStatusCode === STATUS_CODE_RESIGNED ||
        RESIGNED_STATUS_KEYWORDS.some((keyword) => rawStatus.includes(keyword))),
  )

  if (
    signals.hasResignationRecord ||
    rawExplicitlyResigned ||
    signals.registeredStatusCode === STATUS_CODE_RESIGNED
  ) {
    return EMPLOYMENT_STATE.RESIGNED
  }
  if (
    signals.registeredStatusCode !== null &&
    signals.registeredStatusCode !== undefined &&
    STATUS_CODE_ACTIVE.includes(signals.registeredStatusCode)
  ) {
    return EMPLOYMENT_STATE.ACTIVE
  }
  return EMPLOYMENT_STATE.UNKNOWN
}