#!/usr/bin/env python3
import serial, time, string
from datetime import datetime

PORT="/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0"
BAUD=9600

PRINTABLE=set(bytes(string.printable, "ascii"))

def classify(line: bytes):
    # strip CR/LF
    raw=line.strip(b"\r\n")
    if not raw:
        return None, None
    printable = sum(b in PRINTABLE for b in raw)
    ratio = printable / max(1, len(raw))
    try:
        txt = raw.decode("ascii", errors="replace")
    except Exception:
        txt = repr(raw)
    return ratio, txt

ser=serial.Serial(PORT, BAUD, timeout=0.2)
buf=b""
cnt=0
try:
    while True:
        buf += ser.read(4096)
        while b"\n" in buf:
            line, buf = buf.split(b"\n", 1)
            ratio, txt = classify(line+b"\n")
            if ratio is None:
                continue
            cnt += 1
            ts=datetime.now().strftime("%H:%M:%S")
            tag="OK" if txt.startswith("Test #") else "GARBAGE"
            print(f"[{ts}] #{cnt:04d} {tag} printable_ratio={ratio:.2f}  {txt}")
        time.sleep(0.01)
except KeyboardInterrupt:
    pass
finally:
    ser.close()