#You can simulate this code using Wokwi
# WOKWI Simulation link
#https://wokwi.com/projects/380204068912496641

from ultra import DistanceSensor    
from time import sleep

#to read distance from sensor using imported ultra.py
dsa = DistanceSensor(echo=2, trigger=3)
dsb = DistanceSensor(echo=4, trigger=5)
dsc = DistanceSensor(echo=13, trigger=14)
dsd = DistanceSensor(echo=17, trigger=16)

#converting distance in terms of CM
while True:
    distance_a = dsa.distance * 100
    distance_b = dsb.distance * 100
    distance_c = dsc.distance * 100
    distance_d = dsd.distance * 100
    a = float(distance_a)
    b = float(distance_b)
    c = float(distance_c)
    d = float(distance_d) 
 # Convert to a floating-point number

    print(a)
    print(b)
    print(c)
    print(d)
    A="A"
    B="B"
    C="C"
    D="D"
    no=0
    
    #checking weather the slot is free of not
    def parking(distance, n,slot):
        if distance < 30:
        # Code to execute if the distance is less than 30
            print("Space is not free:"+slot)
            if(n==0):
                n=0
            else:
                n=n-1
        else:
        # Code to execute if the distance is not less than 30
            print("Space is free: "+slot)
            if(n==4):
                n=4
            else:
                n=n+1
        return n
        
    #Printing and finding no of space Available
    no=parking(a,no,A)
    no=parking(b,no,B)
    no=parking(c,no,C)
    no=parking(d,no,D)
    no=no
    print("No of space available:",no)
    

   
    sleep(0.1)