import time
import network
import urequests
from machine import Pin, time_pulse_us

DOOR_OPEN_THRESHOLD = 50 # in cm

echoPin = Pin(0, Pin.IN)
trigPin = Pin(1, Pin.OUT)

led = Pin("LED", Pin.OUT)

prevDoorStatus = 67

def getDistanceCM():
    trigPin.value(0)
    time.sleep_us(2)
    trigPin.value(1)
    time.sleep_us(10)
    trigPin.value(0)

    pulse_time = time_pulse_us(echoPin, 1, 30000)
    
    if pulse_time < 0:
        return -1 
        
    distance = pulse_time / 58
    return distance

def sendDoorStatus(status):
    print("door status: " + str(status))
    #requestURL = "http://10.69.70.1/status"
    #r = urequests.post(requestURL, data={"status", status})

def checkDoorDistance():
    global prevDoorStatus # Tell Python to use the global variable
    
    dist = -1
    timeoutTime = 10
    while timeoutTime > 0 and dist == -1:
        dist = getDistanceCM()
        timeoutTime -= 1
        time.sleep(1)

    status = 0;
    if dist < DOOR_OPEN_THRESHOLD:
        status = 1 # door open
        led.on()
    elif dist == -1:
        status = -1 # unknown
    else:
        status = 0 # door closed
        led.off()

    if status != prevDoorStatus:
        sendDoorStatus(status)
        prevDoorStatus = status

def flashLED():
    flashes = 10
    while flashes > 0:
        led.toggle()
        time.sleep_ms(500)
        flashes -= 1

def connectToNet():
    ssid = "ITRnet"
    password = "pink4bubble"

    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(ssid, password)

    MAX_WIFI_CONNECT_WAIT = 30
    while MAX_WIFI_CONNECT_WAIT > 0:
        if wlan.status() < 0 or wlan.status() >= 3:
            break
        MAX_WIFI_CONNECT_WAIT -= 1
        print('waiting to connect...')
        time.sleep(1)

    if wlan.status() != 3:
        raise RuntimeError('network connection failed')
    else:
        flashLED()
        print('connected!')
        status = wlan.ifconfig()
        print('ip = ' + status[0])

# program
 
connectToNet()
while True:
    time.sleep(5)
    checkDoorDistance()