import time
import dht
import network
from machine import Pin

# Hardware configuration
DHT_PIN = 4
LED_PIN = 2

# Initialize DHT22 sensor and LED
sensor = dht.DHT22(Pin(DHT_PIN))
status_led = Pin(LED_PIN, Pin.OUT)

# WiFi configuration
SSID = "Wokwi-GUEST"
PASSWORD = ""


def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)

    if not wlan.isconnected():
        print("[NETWORK LAYER] Connecting to WiFi...")
        wlan.connect(SSID, PASSWORD)

        timeout = 10

        while not wlan.isconnected() and timeout > 0:
            time.sleep(1)
            timeout -= 1

    if wlan.isconnected():
        print("[NETWORK LAYER] Connected. Device IP:",
              wlan.ifconfig()[0])
    else:
        print("[NETWORK LAYER] WiFi unavailable - "
              "continuing in local-only mode.")

    return wlan.isconnected()


# Connect to WiFi
wifi_ok = connect_wifi()

print("=====================================================")
print(" IoT ARCHITECTURE DEMO: Perception -> Network -> Application")
print("=====================================================")


while True:
    try:
        # ---------------- 1) PERCEPTION LAYER ----------------
        sensor.measure()

        t = sensor.temperature()
        h = sensor.humidity()

        print("[PERCEPTION LAYER] Raw sensor data -> "
              "Temp: {} C, Humidity: {} %".format(t, h))

        # ---------------- 2) NETWORK LAYER ----------------
        if wifi_ok:
            print("[NETWORK LAYER] Data packaged and ready "
                  "for transmission to cloud/server.")
        else:
            print("[NETWORK LAYER] No connectivity - data stays "
                  "on the local device only.")

        # ---------------- 3) APPLICATION LAYER ----------------
        if t > 30:
            status_led.value(1)
            print("[APPLICATION LAYER] Decision: Temperature high -> "
                  "Actuator (LED) turned ON")
        else:
            status_led.value(0)
            print("[APPLICATION LAYER] Decision: Temperature normal -> "
                  "Actuator (LED) turned OFF")

        print("-----------------------------------------------------")

        time.sleep(2)

    except OSError as e:
        print("[PERCEPTION LAYER] Sensor read failed:", e)
        time.sleep(3)