import network
import urequests
from machine import Pin, ADC
import dht
import time

# ========== CONFIGURACIÓN ==========
# WiFi (Wokwi)
WIFI_SSID = "Wokwi-GUEST"
WIFI_PASSWORD = ""

# ThingSpeak - CAMBIAR POR TU API KEY
THINGSPEAK_API_KEY = "X6DKOCOC81SABLPO"
THINGSPEAK_URL = "http://api.thingspeak.com/update"

# Pines
dht_sensor = dht.DHT22(Pin(15))
sensor_gas = ADC(Pin(34))
sensor_gas.atten(ADC.ATTN_11DB)
sensor_gas.width(ADC.WIDTH_12BIT)
led = Pin(2, Pin.OUT)

# ========== FUNCIONES ==========
def conectar_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(WIFI_SSID, WIFI_PASSWORD)
    
    print("🌐 Conectando WiFi...")
    timeout = 10
    while not wlan.isconnected() and timeout > 0:
        print(f"⏳ {timeout}...")
        time.sleep(1)
        timeout -= 1
    
    if wlan.isconnected():
        print(f"✅ WiFi OK - IP: {wlan.ifconfig()[0]}")
        return True
    else:
        print("❌ WiFi Error")
        return False

def enviar_datos(temp, hum, gas):
    try:
        # Crear URL con parámetros GET (más compatible con Wokwi)
        gas_volt = gas * (3.3/4095)
        url = f"{THINGSPEAK_URL}?api_key={THINGSPEAK_API_KEY}&field1={temp}&field2={hum}&field3={gas}&field4={gas_volt:.2f}"
        
        print("📤 Enviando a ThingSpeak...")
        response = urequests.get(url)
        
        if response.status_code == 200 and response.text.strip() != "0":
            print(f"✅ Enviado - ID: {response.text.strip()}")
            response.close()
            return True
        else:
            print("❌ Error en envío")
            response.close()
            return False
            
    except Exception as e:
        print(f"❌ Error: {e}")
        return False

# ========== PROGRAMA PRINCIPAL ==========
print("🚀 ESP32 IoT Monitor - WiFi + ThingSpeak")

# Conectar WiFi
conectar_wifi()

# Precalentar MQ-2
print("🔥 Calentando MQ-2... (5s)")
time.sleep(5)

print("✅ Sistema listo!\n")

ultimo_envio = 0

while True:
    try:
        # Leer sensores
        dht_sensor.measure()
        temp = dht_sensor.temperature()
        hum = dht_sensor.humidity()
        gas = sensor_gas.read()
        
        # Control LED
        if gas > 2000:
            led.on()
            estado = "🚨 ALARMA"
        else:
            led.off()
            estado = "✅ Normal"
        
        # Mostrar datos
        print(f"🌡️ {temp:.1f}°C | 💧 {hum:.1f}% | 🔥 {gas} ADC {estado}")
        
        # Enviar cada 15 segundos
        if time.time() - ultimo_envio >= 15:
            if THINGSPEAK_API_KEY != "TU_API_KEY_AQUI":
                if enviar_datos(temp, hum, gas):
                    ultimo_envio = time.time()
            else:
                print("⚠️ Configurar API KEY de ThingSpeak")
                ultimo_envio = time.time()
        
        time.sleep(2)
        
    except Exception as e:
        print(f"Error: {e}")
        time.sleep(2)