# -*- coding: utf-8 -*-
import argparse
import asyncio
import logging
import struct

from bleak import BleakClient, BleakScanner
from bleak.backends.characteristic import BleakGATTCharacteristic
from bleak.uuids import normalize_uuid_str

import myUUIDs

logger = logging.getLogger(__name__)

def current_meas_handler(characteristic: BleakGATTCharacteristic, data: bytearray):
    value = struct.unpack("<I", data)[0]
    logger.info("%s: %f", characteristic.description, value * 1.0e-6)


async def main():
    logger.info("starting scan...")

    device = await BleakScanner.find_device_by_address("84:F7:03:1B:C6:A2", cb=dict(use_bdaddr=False))
    if device is None:
        logger.error("could not find device with address")
        return

    logger.info("connecting to device...")

    async with BleakClient(device) as client:
        logger.info("Connected")

        current_svc_handle = 0
        services = client.services.services
        metrology_svcs = [services[i] for i in services if services[i].uuid == normalize_uuid_str(myUUIDs.METROLOGY_SERVICE)]

        current_meas_svc = next(s for s in metrology_svcs if s.get_characteristic(myUUIDs.ELECTRIC_CURRENT_CHAR))

        for c in current_meas_svc.characteristics:
            await client.start_notify(c, current_meas_handler)
        
        await asyncio.Event().wait()
        # await client.stop_notify(args.characteristic)


if __name__ == "__main__":
    logging.basicConfig(
        level="INFO",
        format="%(asctime)-15s %(name)-8s %(levelname)s: %(message)s",
    )
    
    loop = asyncio.get_event_loop()
    loop.create_task(main())
    loop.run_forever()