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

import time
import serial
import requests
import json

with open('data.json') as json_file:
    server_par = json.load(json_file)
    
    server_ip = server_par['ip']
    server_port = server_par['port']
    
    if server_ip != None and server_port != None:
        API_ENDPOINT = 'http://' + server_ip + ':' + server_port + '/parkingStatus'
        parkingCode = "1"
        ser = serial.Serial(
            port='/dev/ttyACM0',
            baudrate = 9600,
            parity=serial.PARITY_NONE,
            stopbits=serial.STOPBITS_ONE,
            bytesize=serial.EIGHTBITS,
            timeout=1
        )
        counter=0

        prev_status = ser.readline()
        while 1:
            park_status = ser.readline()
            try:
                if park_status != prev_status:
                    if b'1' in park_status:
                        data = """{"no":""" + parkingCode + ""","status":1}"""
                        r = requests.post(url = API_ENDPOINT, data = data)
                        print("parking reserved. RESPONSE :", r.status_code, "\n")
                    elif b'0' in park_status:
                        data = """{"no":""" + parkingCode + ""","status":0}"""
                        r = requests.post(url = API_ENDPOINT, data = data)
                        print("parking not reserved. RESPONSE : ", r.status_code, "\n")
            except NameError:
                print("**Not already prev variable.\n")
            prev_status = park_status
    else:
        print("Create a *.json configuration like: {'ip' : 'xxx.xxx.xxx.xxx', 'port': 'xxxx'}")