import time
import dht
from machine import Pin, ADC

# Pin configuration
DHT_PIN = 4
LDR_PIN = 34
PIR_PIN = 27
FAN_LED_PIN = 25
LIGHT_LED_PIN = 26
BUZZER_PIN = 33

# Hardware setup
sensor = dht.DHT22(Pin(DHT_PIN))

ldr = ADC(Pin(LDR_PIN))
ldr.atten(ADC.ATTN_11DB)

pir = Pin(PIR_PIN, Pin.IN)

fan_led = Pin(FAN_LED_PIN, Pin.OUT)
light_led = Pin(LIGHT_LED_PIN, Pin.OUT)
buzzer = Pin(BUZZER_PIN, Pin.OUT)

# Turn outputs OFF initially
fan_led.value(0)
light_led.value(0)
buzzer.value(0)


# -------- Rule Base --------

def evaluate_rules(t, h, light, motion):

    fan = False
    light_on = False
    alarm = False

    # Rule R1: High temperature
    if t > 30:
        fan = True
        print("[R1] Temperature > 30 C -> FAN ON")

    # Rule R2: High humidity + heat
    if h > 80 and t > 28:
        fan = True
        print("[R2] Humidity > 80% AND Temperature > 28 C -> FAN ON")

    # Rule R3: Critical temperature
    if t > 35:
        alarm = True
        print("[R3] Temperature > 35 C -> ALARM ON")

    # Rule R4: Dark + motion
    if light < 1200 and motion:
        light_on = True
        print("[R4] Dark AND Motion -> LIGHT ON")

    return fan, light_on, alarm


print("===================================")
print(" RULE-BASED INTELLIGENT SYSTEM")
print("===================================")
print("System online")


while True:

    try:

        # Read DHT22
        sensor.measure()

        temperature = sensor.temperature()
        humidity = sensor.humidity()

        # Read light sensor
        light = ldr.read()

        # Read PIR
        motion = pir.value()

        # Convert PIR value to True/False
        motion_detected = (motion == 1)

        print()
        print("----------- SENSING -----------")
        print("Temperature :", temperature, "C")
        print("Humidity    :", humidity, "%")
        print("Light       :", light)
        print("Motion      :", motion_detected)

        # Evaluate rules
        fan, light_on, alarm = evaluate_rules(
            temperature,
            humidity,
            light,
            motion_detected
        )

        # Control blue LED (fan)
        if fan:
            fan_led.value(1)
        else:
            fan_led.value(0)

        # Control yellow LED (room light)
        if light_on:
            light_led.value(1)
        else:
            light_led.value(0)

        # Control buzzer
        if alarm:
            buzzer.value(1)
        else:
            buzzer.value(0)

        print("Fan LED     :", "ON" if fan else "OFF")
        print("Light LED   :", "ON" if light_on else "OFF")
        print("Buzzer      :", "ON" if alarm else "OFF")
        print("-------------------------------")

    except Exception as e:
        print("ERROR:", e)

    time.sleep(2)