import time
from machine import ADC, Pin, I2C
from lcd_api import LcdApi  
from i2c_lcd import I2cLcd  


i = 0

# TEMP SENSOR SETUP
TEMP_PIN = 26
tempSensor = ADC(TEMP_PIN)

#LCD SCREEN SETUP
I2C_ADDR = 0x27 #39 Decimal
I2C_NUM_ROWS = 2
I2C_NUM_COLS = 16

sda = Pin(0)
slc = Pin(1)

i2c = I2C(0, sda=sda, scl=slc, freq=400000)
lcd = I2cLcd(i2c, I2C_ADDR, I2C_NUM_ROWS, I2C_NUM_COLS)

# FAN SETUP

FAN_ACTIVATE_TEMP = 30 #Temperature at which fan comes on


# MOTION SENSOR
motion_detected    = False
motion_in_progress = False

# Define the PIR sensor input pin
pir_pin  = Pin(16, Pin.IN)
led_pin  = Pin(15,Pin.OUT,value=0)


# Callback function to handle motion detection. This function
# will be called when the motion sensor detects movement
def pir_interrupt(pin):
    global motion_detected
    if pin.value() == 1:  # Rising edge (motion detected)
        motion_detected = True
        led_pin.value(1)  # Turn on the LED
    else:  # Falling edge (motion stopped)
        motion_detected = False
        led_pin.value(0)  # Turn off the LED


#register callback for pir pin IRQ
pir_pin.irq(trigger=(Pin.IRQ_RISING | Pin.IRQ_FALLING), handler=pir_interrupt)

time.sleep(0.1) # Wait for USB to become ready

#function to read temp sensor and convert to celsius
def getTemp():
    adc_value = tempSensor.read_u16()
    volt = (3.3/65535) * adc_value
    degC = (100*volt) - 50
    return round(degC,1)

def isFanActivateTemp(temp):
    return temp >= FAN_ACTIVATE_TEMP

def getLightDisplayMsg(isOn):
    if isOn :
        return "Light: ON"
    else :
        return "Light:OFF"

#get display message for LCD
def getDisplayMsg(degC,lightOn):
    if isFanActivateTemp(degC):
        fansState = "ON" 
    else:
        fansState = "OFF"

    return "Fan  :" + fansState + "  " + str(degC) + "C" + "\n" + getLightDisplayMsg(lightOn)


#Main loop
while True:

    #measure temp/display only when i resets to 0
    if i == 0:
        degC = getTemp()    
    
        #TODO FAN LOGIC

        displayMsg = getDisplayMsg(degC,motion_in_progress)
        lcd.clear()
        lcd.putstr(displayMsg)
        print(degC)
    

    if motion_detected and not motion_in_progress:
        print("Motion detected!")
        motion_in_progress = True  # Set the flag to indicate motion detected
        lcd.clear()
        displayMsg = getDisplayMsg(degC,True)
        lcd.putstr(displayMsg)
    elif not motion_detected and motion_in_progress:
        print("Motion stopped")
        motion_in_progress = False  # Reset the flag
        lcd.clear()
        displayMsg = getDisplayMsg(degC,False)
        lcd.putstr(displayMsg)

    if i == 100:
        i = 0
    else:
        i = i+1

    time.sleep(0.1)
    



# Temp Sensor wiring
# VCC -> 3v3  Power
# GND -> GND  Ground
# OUT -> GP26 Data

# LCD -> PICO wiring
# GND -> GND1  Ground
# VCC -> VBUS  5v power
# SDA -> GP0   Data
# SCL -> GP1   Clock