import network
from machine import Pin, ADC
from time import sleep
from dht import DHT11
import BlynkLib

# ==============================
# 🔹 WiFi + Blynk Setup
# ==============================
SSID = "Wokwi-GUEST"
PASSWORD = ""
BLYNK_AUTH = "EsnQrr405mSSeflKTfa13MGF4qlQK-4K"  # Your token

print("Connecting to WiFi...")
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect(SSID, PASSWORD)

while not wifi.isconnected():
    print(".", end="")
    sleep(1)
print("\n✅ WiFi Connected! IP:", wifi.ifconfig()[0])

blynk = BlynkLib.Blynk(BLYNK_AUTH)

# ==============================
# 🔹 Sensor + Pin Setup
# ==============================
mq2 = ADC(Pin(34))           # Gas sensor
mq2.atten(ADC.ATTN_11DB)
mq2.width(ADC.WIDTH_10BIT)

pir = Pin(27, Pin.IN)        # Motion sensor
dht_sensor = DHT11(Pin(25))  # DHT11 temperature & humidity

door_led = Pin(12, Pin.OUT)  # Red LED for alert
light_led = Pin(14, Pin.OUT) # Light control from Blynk
buzzer = Pin(26, Pin.OUT)    # Buzzer alert

# Default gas threshold
gas_threshold = 400

# ==============================
# 🔹 Virtual Pin Handlers
# ==============================
@blynk.on("V5")  # Light ON/OFF control from Blynk
def light_control(value):
    if value[0] == '1':
        light_led.on()
        print("💡 Light ON (from Blynk)")
    else:
        light_led.off()
        print("💡 Light OFF (from Blynk)")

@blynk.on("V6")  # Gas threshold control from Blynk
def update_threshold(value):
    global gas_threshold
    gas_threshold = int(value[0])
    print("📏 Gas threshold set to:", gas_threshold)

# ==============================
# 🔹 Main Monitoring Loop
# ==============================
print("\n🚨 Hazardous Zone Monitoring Started 🚀\n")

while True:
    blynk.run()
    try:
        # Read all sensors
        gas_value = mq2.read()
        motion = pir.value()
        dht_sensor.measure()
        temperature = dht_sensor.temperature()
        humidity = dht_sensor.humidity()
    except Exception as e:
        print("⚠️ Sensor read error:", e)
        gas_value, motion, temperature, humidity = 0, 0, 0, 0

    # --- Safety Condition Logic ---
    alert = False
    status = "✅ Safe"

    if gas_value > gas_threshold:
        alert = True
        status = "⚠️ ALERT: Gas Level High!"
    if motion:
        alert = True
        status = "⚠️ ALERT: Motion Detected!"
    if motion and gas_value > gas_threshold:
        status = "🚨 CRITICAL: Gas Leak + Motion!"

    # --- LED, Buzzer, and Blynk Alerts ---
    if alert:
        door_led.on()       # Red LED ON
        buzzer.on()
        blynk.virtual_write(3, 255)  # Motion LED ON
        blynk.virtual_write(4, status)
    else:
        door_led.off()
        buzzer.off()
        blynk.virtual_write(3, 0)    # Motion LED OFF
        blynk.virtual_write(4, "🚪 Door Open - SAFE")

    # --- Send Data to Blynk ---
    blynk.virtual_write(0, gas_value)    # Gas gauge
    blynk.virtual_write(1, temperature)  # Temperature gauge
    blynk.virtual_write(2, humidity)     # Humidity gauge

    # --- Debug Info ---
    print(f"Gas: {gas_value}, Temp: {temperature}°C, Humidity: {humidity}%, Motion: {motion}, Threshold: {gas_threshold}")
    print("Status:", status)
    print("===================================")
    sleep(2)