import time
from machine import I2C, Pin, ADC
from lcd_api import LcdApi
from pico_i2c_lcd import I2cLcd

lightPin = Pin(12, Pin.OUT)
fanPin = Pin(13, Pin.OUT)
fanButton = Pin(14, Pin.IN)
lightButton = Pin(15, Pin.IN)
buzzPin = Pin(16, Pin.OUT)
potPin = ADC(Pin(26))
ldrPin = ADC(Pin(28))

#to use push buttons as toggle switches
fanOldstate = 1
fanNewstate = 0
lightOldstate = 1
lightNewstate = 0
fanStatus = False
lightStatus = False
fanOverride = False
lightOverride = False

#limits for auto features
ldrThreshold = 80
potThreshold = 30
buzzThreshold = 60

I2C_ADDR = 39  #[39] is the register address for this lcd.
i2c = I2C(0, sda=machine.Pin(0), scl=machine.Pin(1), freq=400000)
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)

#function for beeping the buzzer
def beepBuzzer(iterations):
    for i in range(iterations):
        buzzPin.on()
        time.sleep_ms(100)
        buzzPin.off()
        time.sleep_ms(100)

while True:
    potReading = potPin.read_u16() * (100/65535)
    ldrReading = ldrPin.read_u16() * (100/65535)

    #Manual control of the Fan.
    fanNewstate = fanButton.value()
    if fanOldstate == 0 and fanNewstate == 1:
        fanOverride = not fanOverride
        if fanOverride:
            fanStatus = not fanStatus
            fanPin.value(fanStatus)
    fanOldstate = fanNewstate
    time.sleep(0.05)

    #Manual control of the Light.
    lightNewstate = lightButton.value()
    if lightOldstate == 0 and lightNewstate == 1:
        lightOverride = not lightOverride
        if lightOverride:
            lightStatus = not lightStatus
            lightPin.value(lightStatus)
    lightOldstate = lightNewstate
    time.sleep(0.05)
    
    #Auto control of the light using LDR
    if not lightOverride:
        if ldrReading >= ldrThreshold:
            lightStatus = True
        else:
            lightStatus = False
        lightPin.value(lightStatus)

    #Auto control of fan based on pot readings
    if not fanOverride:
        if potReading >= potThreshold:
            fanStatus = True
        else:
            fanStatus = False
        fanPin.value(fanStatus)

    #Feedback buzzer thingy
    oldPotReading = potReading
    newPotReading = potPin.read_u16() * (100/65535)
    if oldPotReading < buzzThreshold and newPotReading >= buzzThreshold:
        beepBuzzer(3)
    newPotReading = oldPotReading
    time.sleep(0.05)

    formatted_temperature = "{:.1f}".format(potReading)
    string_temperature = str("T=" + formatted_temperature + "C")

    formatted_light = "{:.1f}".format(ldrReading)
    string_light = str("L=" + formatted_light)    
    

    #lcd display programming
    if fanStatus == True:
        fan = "Fan=ON"
        lcd.move_to(15,1)
        lcd.putstr(" ")
    else:
        fan = "Fan=OFF"

    if lightStatus == True:
        light = "Lite=ON"
        lcd.move_to(7,1)
        lcd.putstr(" ")
    else:
        light = "Lite=OFF"

    lcd.move_to(0,0)
    lcd.putstr(string_temperature)
    lcd.move_to(10,0)
    lcd.putstr(string_light)
    lcd.move_to(0,1)
    lcd.putstr(fan)
    lcd.move_to(8,1)
    lcd.putstr(light)
    time.sleep(0.1)