#Authors:   Oulis Evangelos, Oulis Nikolaos, Drosos Katsibras
#===================================================================
#!/usr/bin/env python

import json
import requests


server_ip = "iot-smart-parking.herokuapp.com"
server_port = "443"
API_ENDPOINT = 'https://' + server_ip + ':' + server_port + '/'

try:
        ser = serial.Serial(
            port='/dev/ttyACM0',
            baudrate = 9600,
            parity=serial.PARITY_NONE,
            stopbits=serial.STOPBITS_ONE,
            bytesize=serial.EIGHTBITS,
            timeout=1
        )
        
        c = requests.get(url=API_ENDPOINT, params = {})
        doc = c.json()

        parking = None 
        for park in doc:
                if doc[str(park)] == 1:
                        parking = park
                        break

        print ("Free parking is Number: " + parking)
        ser.write("b'" + parking + "'")
        ser.flush()
except (NameError, TypeError) as e:
        print ("No free parking")
except requests.exceptions.ConnectionError:
        print("No Internet access")