import time
import network
import ujson
from machine import Pin
from umqtt.simple import MQTTClient

# ========== CẤU HÌNH ========== #
WIFI_SSID = "Wokwi-GUEST"
WIFI_PASS = ""
THINGSBOARD_HOST = "demo.thingsboard.io"
ACCESS_TOKEN = "HVXzPxbGDfuaqqkoGZbz"

# ========== GPIO ========== #
LDR_DO = Pin(26, Pin.IN)
RELAY = Pin(27, Pin.OUT)
RELAY.value(0)

# ========== WIFI ========== #
def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(WIFI_SSID, WIFI_PASS)
    print("🔌 Kết nối WiFi...")
    while not wlan.isconnected():
        time.sleep(0.5)
    print("✅ Đã kết nối WiFi:", wlan.ifconfig())

# ========== MQTT ========== #
connect_wifi()
client = MQTTClient("pico", THINGSBOARD_HOST, user=ACCESS_TOKEN, password="")
client.connect()
print("✅ MQTT connected")

# ========== BIẾN TOÀN CỤC ========== #
on_count = 0
status = "OFF"
control_mode = "AUTO"
start_time = time.time()

# ========== LOOP ========== #
while True:
    try:
        light_detected = LDR_DO.value()  # 0 = tối, 1 = sáng

        if control_mode == "AUTO":
            if light_detected == 0 and status != "ON":
                RELAY.value(1)
                status = "ON"
                on_count += 1
            elif light_detected == 1 and status != "OFF":
                RELAY.value(0)
                status = "OFF"

        telemetry = {
            "ambient_light": int(not light_detected) * 1023,
            "status": status,
            "mode": control_mode,
            "on_count": on_count,
            "uptime": int(time.time() - start_time),
            "model": "Pico-LDR-v1"
        }

        client.publish("v1/devices/me/telemetry", ujson.dumps(telemetry))
        print("📤 Sent:", telemetry)

    except Exception as e:
        print("❌ Error sending data:", e)

    time.sleep(3)