"""Dump whatever raw bytes the CANdapter sends after opening a channel.

Useful when frames aren't parsing as expected - shows the literal serial
stream so we can see if it's real (but differently-shaped) CAN frames,
error/status chatter, or nothing at all.

Usage:
    python raw_dump.py [--bitrate 500000] [--seconds 5]
"""
import argparse
import sys
import time
from pathlib import Path

import serial

sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
from adapters.candapter import BITRATE_CODES  # noqa: E402

DEFAULT_PORT = "/dev/cu.usbserial-DNBJV4F5"


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--port", default=DEFAULT_PORT)
    parser.add_argument("--bitrate", type=int, default=500_000)
    parser.add_argument("--seconds", type=float, default=5.0)
    args = parser.parse_args()

    ser = serial.Serial(args.port, 115200, timeout=0.2)
    with ser:
        ser.write(b"C\r")
        time.sleep(0.1)
        ser.read(ser.in_waiting or 1)

        ser.write(f"S{BITRATE_CODES[args.bitrate]}\r".encode())
        time.sleep(0.1)
        print("S reply:", ser.read(ser.in_waiting or 1))

        ser.write(b"O\r")
        time.sleep(0.1)
        print("O reply:", ser.read(ser.in_waiting or 1))

        print(f"\nRaw stream for {args.seconds}s:")
        deadline = time.monotonic() + args.seconds
        got_any = False
        while time.monotonic() < deadline:
            chunk = ser.read(256)
            if chunk:
                got_any = True
                print(repr(chunk))
        if not got_any:
            print("(nothing received)")

        ser.write(b"C\r")

    return 0


if __name__ == "__main__":
    raise SystemExit(main())