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

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

import dearpygui.dearpygui as dpg

import myUUIDs

logger = logging.getLogger(__name__)

loop = None

current_meas = {}
start_time = None

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

    global start_time
    global current_meas
    
    if(start_time is None):
        start_time = time.monotonic_ns()

    start_time += 1

    if(not handle in current_meas):
        logger.info("%d %s", handle, current_meas)
        current_meas[handle] = []
        dpg.add_line_series([], [], label=f"{handle}", parent="y_axis", tag=f"serie{handle}")
    
    current_meas[handle].append(((time.monotonic_ns() - start_time) * 1e-9, value * 1e-6))

    dpg.set_value(f"serie{handle}", [ [v[0] for v in current_meas[handle]], [v[1] for v in current_meas[handle]] ])
    dpg.fit_axis_data("x_axis")
    dpg.fit_axis_data("y_axis")


async def connect():
    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)

def start_connection():
    loop.create_task(connect())

async def init_gui():
    dpg.create_context()
    dpg.create_viewport()
    dpg.setup_dearpygui()

    with dpg.window(label="Controls", pos = [0, 0], width = dpg.get_viewport_width(), height = 100):
        dpg.add_button(label="Connect", callback=start_connection)
        
    with dpg.window(label="Graphs", pos = [0, 100]):
        with dpg.plot(label="Current", width = -1, height = -1):
            dpg.add_plot_legend()

            dpg.add_plot_axis(dpg.mvXAxis, label="x", tag="x_axis")
            dpg.add_plot_axis(dpg.mvYAxis, label="y", tag="y_axis")

            dpg.set_axis_limits_auto("x_axis")
            dpg.set_axis_limits_auto("y_axis")

    dpg.show_viewport()
    while dpg.is_dearpygui_running():
        dpg.render_dearpygui_frame()
        await asyncio.sleep(0)
    dpg.destroy_context()

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