# 离线只读验证：不访问网络、不操作设备，只读取同目录合成输入。
import json, math, struct, statistics
from pathlib import Path
def check(d):
 out=[]
 for p in d['samples']:
  t=p.get('sampled_at')
  if t is None: out.append('时效未知')
  elif t>d['now']: out.append('时钟异常')
  elif d['now']-t>d['max_age']: out.append('过期')
  else: out.append('接受')
 return out

if __name__=='__main__':
 fixture=json.loads(Path(__file__).with_name('fixture.json').read_text(encoding='utf-8'))
 actual=check(fixture['input'])
 assert actual==fixture['expected'], {'实际':actual,'预期':fixture['expected']}
 print(json.dumps({'状态':'通过','实际':actual,'边界':'仅离线合成样例，现场未测'},ensure_ascii=False))