#!/usr/bin/python
# -*- coding:utf-8 -*-
import RPi.GPIO as GPIO
import paho.mqtt.client as mqtt
import serial
import time, os

# MQTT Broker settings

mqttBroker ="65.108.199.212"
myhost = os.uname()[1]
client = mqtt.Client(myhost)
client.connect(mqttBroker, 1883)

ser = serial.Serial('/dev/ttyS0',115200)
ser.flushInput()

rec_buff = ''
rec_buff2 = ''
time_count = 0

def send_at(command,back,timeout):
    rec_buff = ''
    ser.write((command+'\r\n').encode())
    time.sleep(timeout)
    if ser.inWaiting():
        time.sleep(0.01 )
        rec_buff = ser.read(ser.inWaiting())
    if rec_buff != '':
        if back not in rec_buff.decode():
            print(command + ' ERROR')
            print(command + ' back:\t' + rec_buff.decode())
            return 0
        else:
            print(rec_buff.decode())
            return 1
    else:
        print('GPS no está listo')
        return 0

def get_gps_position():
	rec_null = True
	answer = 0
	print('Iniciando GPS')
	rec_buff = ''
	send_at('AT+CGPS=1,1','OK',1)
	time.sleep(2)
	while rec_null:
		answer = send_at('AT+CGPSINFO','+CGPSINFO: ',1)
		if 1 == answer:
			answer = 0
			if ',,,,,,' in rec_buff:
				print('GPS no está listo')
				rec_null = False
				time.sleep(1)
			else:
			# Parse GPS data
                            gps_data = rec_buff.decode().split('+CGPSINFO: ')[1].strip()
                            lat, lon = parse_gps_data(gps_data)
                            if lat and lon:
                                # Send GPS coordinates to MQTT broker
                                mqtt_payload = f"{lat},{lon}"
                                client.publish("iiot/"+ myhost +"/gps", mqtt_payload)
		else:
			print('error %d'%answer)
			rec_buff = ''
			send_at('AT+CGPS=0','OK',1)
			return False
		time.sleep(1.5)

def parse_gps_data(gps_data):
    parts = gps_data.split(',')
    if len(parts) >= 4:
        lat = convert_to_degrees(parts[0])
        lon = convert_to_degrees(parts[2])
        return lat, lon
    return None, None

def convert_to_degrees(raw_value):
    if raw_value:
        degree = float(raw_value[:2])
        minute = float(raw_value[2:])
        return degree + (minute / 60.0)
    return None

def power_on(power_key):
	print('SIM7600X is starting:')
	GPIO.setmode(GPIO.BCM)
	GPIO.setwarnings(False)
	GPIO.setup(power_key,GPIO.OUT)
	time.sleep(0.1)
	GPIO.output(power_key,GPIO.HIGH)
	time.sleep(2)
	GPIO.output(power_key,GPIO.LOW)
	time.sleep(20)
	ser.flushInput()
	print('SIM7600X is ready')

def power_down(power_key):
	print('SIM7600X is loging off:')
	GPIO.output(power_key,GPIO.HIGH)
	time.sleep(3)
	GPIO.output(power_key,GPIO.LOW)
	time.sleep(18)
	print('Good bye')

try:
	#power_on(power_key)
	get_gps_position()
	#power_down(power_key)
except:
	if ser != None:
		ser.close()
	#power_down(power_key)
	GPIO.cleanup()
if ser != None:
		ser.close()
		GPIO.cleanup()