"""
 test new circuit python 6.2.0 from 01.04.2021
 loaded to Raspberry Pi PICO ( USB connect while [bootsel] button pressed )
 download from: https://circuitpython.org/board/raspberry_pi_pico/

 for libraries:
 https://github.com/adafruit/Adafruit_CircuitPython_Bundle/releases/latest
 download like adafruit-circuitpython-bundle-6.x-mpy-20210403.zip
 find:
 adafruit-circuitpython-bundle-6.x-mpy-20210403\lib\adafruit_dht.mpy
 and copy into PICO:
 /media/pi/CIRCUITPY/lib/adafruit_dht.mpy
 now can use:

 import adafruit_dht

"""

import board
import time
import supervisor
import microcontroller

from analogio import AnalogIn

analog_in0 = AnalogIn(board.A0) # GP26 pin 31
analog_in1 = AnalogIn(board.A1) # GP27 pin 32
analog_in2 = AnalogIn(board.A2) # GP28 pin 34

def get_volt(pin):
    return (pin.value * 3.3) / 65536

def get_pct(pin):
    return (pin.value * 100.0) / 65536

#import busio
#i2c = busio.I2C(scl=board.GP9, sda=board.GP8)   # gives a: RuntimeError: No pull up found on SDA or SCL; check your wiring
#print("Hello, i am PICO use I2C / SDA GP8 pin11 / SCL GP9 pin 12")


import adafruit_dht
print("dht-library loaded")
dhtDevice = adafruit_dht.DHT22(board.GP7)   # GP7 pin 10

"""
sleep_timer = 2.0
retries = 3
samples = 3

# a good stand alone function, now unused and rewrite for non blocking...
def sample_and_avg_DHT(sleep_timer, retries, samples): # takes min 6 sec or forever
    valid = 0
    invalid = 0
    temperature_c =0
    humidity = 0
    while valid < samples:
        try:
            temperature_c = temperature_c + dhtDevice.temperature
            humidity = humidity + dhtDevice.humidity
            valid += 1
            print("valid: {}".format(valid) )

        except:
            invalid += 1
            print("invalid: {}".format(invalid) )
            if invalid > retries:
                print("Retries exceeded Aborting")
                print("Last Error{}".format(dhtDevice.exit()))
                return(-1,-1)
        time.sleep(sleep_timer)
    return (round(temperature_c/valid, 1), round(humidity/valid,1))
"""


valid = 0
invalid = 0
noskip = False # we assume we come from a one sec flag but for DHT need a two sec sampling
diagprint = True # as parameter

def get_dht(diagprint):
    global valid
    global invalid
    global dhtT
    global dhtH
    global noskip

    #local filter tuning
    fA = 0.9
    fB = 1.0-fA

    if ( noskip ):
        try:
            newT = dhtDevice.temperature
            newH = dhtDevice.humidity
            valid += 1
            if (diagprint):
                print("valid: {}, newT: {}, newH: {}".format(valid, newT,newH) )
            dhtT = dhtT*fB + newT*fA
            dhtH = dhtH*fB + newH*fA
            noskip = False

        except:
            invalid += 1
            if (diagprint):
                print("invalid: {}".format(invalid) )
    else: # wait one more sec loop
        noskip = True


def inputavail():
    global inval
    if supervisor.runtime.serial_bytes_available:
        inval = input().strip() # as soon you start typing anything, it blocks until [enter] !!
        if ( inval == 'p' or inval == 'v' or inval == 't' or inval == 'w' ):
            print("ok")
        elif ( inval == 'q' ):
            loop = False
            print("END")
        elif ( inval == 'h' or inval == '?' ):
            help()
        else:
            print("what was that?")
            inval = 'p'

def help():
    print("Hello, i am Raspberry Pi PICO")
    print("and use Ain 0,1,2 pin 31,32,34 and print as PCT")
    print("with DHT22 sensor use GP7 pin 10")
    print("operation: type in REPL:")
    print("for Ain as VOLT or PCT, 'v' or 'p'")
    print("or cpu temperature 't'")
    print("or 'w' for DHT sensor")
    print("or 'h' or '?' for this help")
    print("or 'q' / [ctrl][d] for stop")

#_____________________________________________________ globals
loop = True
inval = 'p'
lastsec = 0
inow = 0
measure = False
dhtT =-999.0
dhtH = -999.0

#_____________________________________________________ MAIN
help()
while loop:
    if ( measure ):
        measure = False   # reset until main loop find new second
        if ( inval == 'p' ):
            print("Ain: {0:5.1f}, {1:5.1f}, {2:5.1f}, [PCT]".format(get_pct(analog_in0),get_pct(analog_in1),get_pct(analog_in2)) )
        if ( inval == 'v' ):
            print("Ain: {0:5.1f}, {1:5.1f}, {2:5.1f}, [Volt]".format(get_volt(analog_in0),get_volt(analog_in1),get_volt(analog_in2)) )
        if ( inval == 't' ):
            print("cpu temperature: {0:5.1f} [C]".format(microcontroller.cpu.temperature) )
        if ( inval == 'w' ): # get temp and humidity from DHT22
            get_dht(diagprint) # every 2 secs only and filtered to dhtT and dhtH, with (diagprint)
            print("DHT22: Temperature:{0:5.1f} [C], Humidity:{1:5.1f} [%]".format( dhtT, dhtH ) )
            #print("DHT22: Temperature:{} [C], Humidity:{} [%]".format(*sample_and_avg_DHT(sleep_timer, retries, samples)))

    inputavail()

# replace the time.sleep(1.0) with a 1 sec flag

    inow = time.time()   # sec after 1.1.1970
    if ( inow > lastsec ):
        lastsec = inow
        measure = True  # seconds flag

# end