"""模拟真机 M2S100 场景: 设备 100ms 周期上报 30 帧, 验证帧按帧粒度
到达 GUI 回调(间隔≈100ms, 到达→消费延迟<300ms), 而非攒批后一次涌入。
"""
import os
import sys
import time
import threading

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
from link import SerialLink
import protocol as d

got = []
cfg = d.ProtoConfig()
link = SerialLink(cfg, on_status=lambda s, ts: None)
link.on_frame = lambda fr, ts: got.append((time.time(), ts))

link.open('loop://', 115200)
deadline = time.time() + 5
while time.time() < deadline and not link.is_connected():
    time.sleep(0.05)
assert link.is_connected(), 'loop:// 未连接'

resp = bytes.fromhex('B5 F0 08 6F 6B 54 4C 3A 32 34 36 48')

def feeder():
    for _ in range(30):
        link.ser.write(resp)
        time.sleep(0.1)

t = threading.Thread(target=feeder)
t.start()
t.join()
time.sleep(0.5)                     # 等最后一帧走完读线程

n = len(got)
print('收到帧数:', n, '(期望 30)')
if n >= 2:
    gaps = [b[0] - a[0] for a, b in zip(got, got[1:])]
    lag = [cb - ts for cb, ts in got]
    print('回调间隔 min/max/avg(ms): %d / %d / %d'
          % (min(gaps) * 1000, max(gaps) * 1000, sum(gaps) / len(gaps) * 1000))
    print('到达→消费延迟 max(ms):', round(max(lag) * 1000))
    ok = n == 30 and max(gaps) < 0.5 and max(lag) < 0.3
else:
    ok = False
print('RESULT:', 'PASS' if ok else 'FAIL')
link.close()
sys.exit(0 if ok else 1)