import machine
import network
import time
import os
from dotenv import load_dotenv

load_dotenv()

"""
pico_funcs: Helper functions for things the pico can do.
"""


def read_cpu_temp():
    """
    If you print the value of the temperature value you are going to get an integer number between 0 and 65535.
    So, we have to convert this value either to the Celsius degree scales.

    The temperature sensor works by delivering a voltage to the ADC4 pin that is proportional to the temperature.
    From the datasheet, a temperature of 27 degrees Celsius delivers a voltage of 0.706 V.
    With each additional degree the voltage reduces by 1.721 mV or 0.001721 V.
    The first step in converting the 16-bit temperature is to convert it back to volts, which is done based on the 3.3 V maximum voltage used by the Pico board.
    ref: https://how2electronics.com/read-temperature-sensor-value-from-raspberry-pi-pico/
    """
    cpu_temp_conversion_factor = 3.3 / 65535
    cpu_temp_sensor = machine.ADC(4)
    reading = cpu_temp_sensor.read_u16() * cpu_temp_conversion_factor
    temperature_c = 27 - (reading - 0.706) / 0.001721
    temperature_f = temperature_c * 9 / 5.0 + 32.0
    return temperature_f


def wlan_up(wlan):
    wlan.active(True)
    wlan.connect(os.getenv("HOME_WIFI_SSID"), os.getenv("HOME_WIFI_PWD"))

    # Wait for connect or fail
    max_wait = 10
    while max_wait > 0:
        if wlan.status() < 0 or wlan.status() >= 3:
            break
        max_wait -= 1
        time.sleep(1)

    if max_wait == 0:
        return None

    ifconfig = wlan.ifconfig()
    return ifconfig


def led_error_code(led, error_code: int):
    """Blink LED for a given error code (int). error code == number of times to blink"""

    # Run a quick 'start error code sequence'
    # So we know when LED error sequence starts
    start_sequence_counter = 0
    while start_sequence_counter < 3:
        led.value(True)
        time.sleep(0.1)
        led.value(False)
        time.sleep(0.1)
        start_sequence_counter += 1

    # Run real error code sequence
    blink_counter = 0
    while blink_counter < error_code:
        time.sleep(1)
        led.value(True)
        time.sleep(1)
        led.value(False)
        blink_counter += 1
    # Make sure to turn off LED when this subroutine finished
    led.value(False)