#!/usr/bin/env python3
"""Print micrOBU LOG frames without participating in the station-link session."""
from __future__ import annotations

import argparse
import time

import serial

from microbu_link.serial_transport import FrameDecoder, FrameType


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--port', required=True)
    parser.add_argument('--duration', type=float, default=15.0)
    parser.add_argument('--reset', action='store_true', help='pulse EN through USB Serial/JTAG before monitoring')
    args = parser.parse_args()
    port = serial.Serial(args.port, 115200, timeout=0.05, write_timeout=1)
    port.dtr = False
    port.rts = False
    if args.reset:
        port.rts = True
        time.sleep(0.1)
        port.rts = False
    decoder = FrameDecoder()
    deadline = time.monotonic() + args.duration
    try:
        while time.monotonic() < deadline:
            for frame_type, payload in decoder.feed(port.read(4096)):
                if frame_type == FrameType.LOG:
                    print(payload.decode('utf-8', 'replace'), flush=True)
    finally:
        port.close()


if __name__ == '__main__':
    main()