# -*- 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
from ble_interface import ble_interface

import dearpygui.dearpygui as dpg

import myUUIDs
from ble_interface import ble_interface

logger = logging.getLogger(__name__)

loop: asyncio.AbstractEventLoop
device: ble_interface

current_meas = {}
max_current = 0
start_time = None

def clear_plot(sender, app_data):
    logger.info("clear")
    global current_meas
    global start_time
    global max_current
    for d in current_meas:
        current_meas[d] = []
    start_time = None
    max_current = 0
    
def on_connect_handler(device: ble_interface):
    device.subscribe_to(device.CURRENT)
    device.subscribe_to(device.RANGE, normalize_uuid_str(myUUIDs.ELECTRIC_CURRENT_RANGE_CHAR))
    loop.create_task(update_conf_values())

async def update_conf_values():
    refresh_rate = await device.get_refresh_delay()
    dpg.set_value("refresh delay", refresh_rate)

    zero_cali_nsamp = await device.get_zero_cali_nsamp()
    dpg.set_value("zero_nsamp", zero_cali_nsamp)
    
    auto_range = await device.get_auto_range()
    dpg.set_value("auto_range", auto_range)
    
    range = await device.get_range()
    dpg.set_value("range", range)


def current_meas_handler(device: ble_interface, input_handle: int, newval: int):
    value = newval
    handle = input_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))

    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")

    global max_current
    max_current = max(max_current, newval)
    dpg.set_axis_limits("y_axis", 0., 1.1 * max_current)

    txt = ""
    for h in current_meas:
        if(len(current_meas[h]) == 0):
            continue
        txt += f"{h} : {current_meas[h][-1][1]} | "
    dpg.set_value("last_current_values", txt)

def range_changed_handler(device: ble_interface, val: int):
    dpg.set_value("range", val)
    
def update_refresh_rate(sender, app_data):
    logger.info("refresh rate %d", app_data)
    device.update_refresh_delay(app_data)
    
def update_zero_nsamp(sender, app_data):
    logger.info("nsamp %d", app_data)
    device.update_zero_cali_nsamp(app_data)

def set_auto_range(sender, app_data):
    logger.info("auto range %d", app_data)
    device.update_auto_range(app_data)

def set_range(sender, app_data):
    logger.info("set range %d", app_data)
    device.update_range(app_data)

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

    with dpg.window(label="Controls", pos = [0, 0], width = 200, height = dpg.get_viewport_height()):
        dpg.add_button(label="Connect", callback=device.connect)
        dpg.add_input_int(label="Refresh Delay", callback=update_refresh_rate, on_enter=True, tag="refresh delay")
        dpg.add_button(label="Zero", callback=device.zero_cali)
        dpg.add_input_int(label="Zero nb sample", callback=update_zero_nsamp, on_enter=True, tag="zero_nsamp")
        dpg.add_button(label="Reset offsets", callback=device.reset_offsets)
        dpg.add_checkbox(label="Auto-range", callback=set_auto_range, tag="auto_range")
        dpg.add_input_int(label="Range", callback=set_range, on_enter=True, tag="range")
        
    with dpg.window(label="Graphs", pos = [200, 0], width = dpg.get_viewport_width()-200, height = dpg.get_viewport_height()):
        dpg.add_button(label="Clear", callback=clear_plot)
        dpg.add_text(label="Current", tag="last_current_values")
        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()
    
    device = ble_interface("84:F7:03:1B:C6:A2", loop, logger)
    device.add_callback(device.ON_CONNECT, on_connect_handler)
    device.add_callback(device.CURRENT, current_meas_handler)
    device.add_callback(device.RANGE, range_changed_handler)
    
    loop.create_task(init_gui())
    loop.run_forever()