"""
Module for using the AP Graduate IoT board in a more userfriendly way.

Hardware:
GPIO  Hardware
2-9   led1-led8
10    button 2
22    button 1
25    led0 (on raspberry pi)

ADC   Hardware
0     temperature sensor (NTC thermistor via spanningsdeler)
28    turn knob
"""

from machine import Pin, ADC
from time import sleep
from math import log

MAXLED = 8  # Max aantal leds

# LEDs

def led(n, use_pin=False):
    if use_pin:
        return Pin(n, Pin.OUT)
    if n == 0:
        return Pin(25, Pin.OUT)
    if 2 <= n <= 9:
        return Pin(n, Pin.OUT)
    raise ValueError(f"Invalid LED number: {n}. Must be 0 or 2-{MAXLED}.")

# Buttons

def button(n):
    if n == 1:
        return Pin(22, Pin.IN, Pin.PULL_UP)
    elif n == 2:
        return Pin(10, Pin.IN, Pin.PULL_UP)
    else:
        raise ValueError(f"Invalid button number: {n}. Must be 1 or 2.")

# Temperatuursensor NTC via spanningsdeler

def read_temperature_ntc():
    """
    Lees temperatuur van een NTC-thermistor aangesloten via spanningsdeler op ADC0.
    Retourneert temperatuur in graden Celsius.
    """
    sensor = ADC(0)
    reading = sensor.read_u16()
    voltage = reading * 3.3 / 65535

    Vcc = 3.3
    R_fixed = 10000  # Ohm, vaste weerstand in spanningsdeler
    B = 3950         # B-waarde NTC (pas aan indien anders)
    R0 = 10000       # Weerstand bij 25°C (Ohm)

    # Bereken NTC weerstand
    try:
        R_ntc = R_fixed * voltage / (Vcc - voltage)
    except ZeroDivisionError:
        R_ntc = 0 

    
    if R_ntc > 0:
        T0 = 25 + 273.15  # referentietemperatuur Kelvin
        inv_T = (1 / T0) + (1 / B) * log(R_ntc / R0)
        T = 1 / inv_T
        temp_c = T - 273.15
    else:
        temp_c = None  # foutwaarde

    print(f"ADC: {reading}, Voltage: {voltage:.3f} V, R_ntc: {R_ntc:.1f} Ω, Temp: {temp_c if temp_c else 'Error'} °C")

    return temp_c

# Turn knob

def read_turn_knob():
    knob = ADC(28)
    return knob.read_u16()

# Test code

if __name__ == '__main__':
    print("Test LEDs:")
    for i in range(2, MAXLED + 1):
        print(f"  LED {i} aan")
        led(i).on()
        sleep(0.5)
        led(i).off()

    print("\nTest NTC temperatuur sensor:")
    temp = read_temperature_ntc()
    if temp is not None:
        print(f"  Temperatuur: {temp:.2f} °C")
    else:
        print("  Fout bij uitlezen temperatuur.")

    print("\nTest draaisensor:")
    knob_value = read_turn_knob()
    print(f"  Draaisensor waarde: {knob_value}")