#!/usr/bin/python3


"""Executable to read the Key Events from the Barcode Scanner (root Priviledges necessary)"""


import evdev
import os

import iot_barcode_scanner.config as config


def main():

    try:
        # read config
        cfg = config.get_config()
        fifo_path = cfg["scanner"]["fifo_path"]
        event_device_path = cfg["scanner"]["evdev_path"]

        # prepare fifo
        os.makedirs(os.path.dirname(fifo_path), exist_ok=True)
        os.mkfifo(fifo_path)

        barcode_scanner = evdev.InputDevice(event_device_path)
        with barcode_scanner.grab_context():
            for event in barcode_scanner.read_loop():
                if event.type == evdev.ecodes.EV_KEY:
                    eventdata = evdev.categorize(event)
                    if eventdata.keystate:
                        with open(fifo_path, "a") as fifo:
                            fifo.append(eventdata.keycode)

    except KeyboardInterrupt:
        pass

    finally:
        os.remove(fifo_path)


if __name__ == "__main__":
    main()