import network       # For Wi-Fi connectivity
import time          # For delays and timing
import urequests     # For making HTTP requests
import dht           # For interfacing with DHT sensors
from machine import Pin  # For controlling GPIO pins

# Wi-Fi credentials
ssid = 'Wokwi-GUEST'     # SSID of the Wi-Fi network
password = ''            # Password (empty for open networks like Wokwi-GUEST)

# url azure
SERVER_URL = 'https://server-temp-g2d3a9g8ewf2cxad.canadacentral-01.azurewebsites.net/api/data' 

# Set up Wi-Fi in station mode
wlan = network.WLAN(network.STA_IF)  # Create a WLAN object in station mode, the device connects to a Wi-Fi network as a client. 
wlan.active(True)                    # Activate the Wi-Fi interface
wlan.connect(ssid, password)         # Connect to the specified Wi-Fi network

# Wait until connected
print("Connecting to Wi-Fi...", end="")
while not wlan.isconnected():
    print(".", end="")               # Print dots while waiting
    time.sleep(0.5)                  # Wait half a second before retrying

# Once connected, print confirmation and IP address
print("\nConnected!")
print("IP address:", wlan.ifconfig()[0])  # Display the assigned IP address

# Initialize the DHT22 sensor on GPIO pin 15
sensor = dht.DHT22(Pin(15))

def send_to_server(temp, hum):
    if temp is None or hum is None:
        print("No data to send.")
        return
    try:
        data = {
            "temperature": temp,
            "humidity": hum
        }
        response = urequests.post(SERVER_URL, json=data)
        print("Server response:", response.text)
        response.close()
    except Exception as e:
        print("Failed to send data:", e)

# Main loop: read sensor and send data every 15 seconds
while True:
    try:
        sensor.measure()                      # Trigger sensor measurement
        temperature = sensor.temperature()    # Read temperature in Celsius
        humidity = sensor.humidity() 
        print("Temperature:", temperature, "°C")  # Display temperature
        print("Humidity:", humidity, "%")
        send_to_server(temperature, humidity)       # Send data to server
    except Exception as e:
        print("Error reading sensor or sending data:", e)  # Handle errors

    time.sleep(15)