#!/usr/bin/python
# -*- coding:utf-8 -*-
import RPi.GPIO as GPIO
import serial
import time
from datetime import datetime
import os
import signal
from influxdb_client import InfluxDBClient, Point
from influxdb_client.client.write_api import SYNCHRONOUS
import logging

# Set up logging
logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')

# GPIO configuration
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

try:
    ser = serial.Serial('/dev/ttyUSB3', 115200)
    ser.flushInput()
except serial.SerialException as e:
    logging.error(f"Failed to open serial port: {e}")
    exit(1)

myhost = os.uname()[1]

# InfluxDB settings
INFLUXDB_URL = "http://100.64.0.24:8086"
INFLUXDB_TOKEN = "IPtqPXbaXuuMHvx_tUOt1cmIZfLHucd-9DcepXTVpQc-fNKBhp6pkhyTsq_XnoGXdxwILy5AFFgZ_QUZCE5Jhg=="
INFLUXDB_ORG = "juandiego"  # Replace with your organization name
INFLUXDB_BUCKET = "gpsdata"

# Initialize InfluxDB client
try:
    client = InfluxDBClient(url=INFLUXDB_URL, token=INFLUXDB_TOKEN, org=INFLUXDB_ORG)
    write_api = client.write_api(write_options=SYNCHRONOUS)
    logging.info("Successfully connected to InfluxDB")
except Exception as e:
    logging.error(f"Failed to connect to InfluxDB: {e}")
    exit(1)

def parse_gps_data(gps_string):
    parts = gps_string.split(',')
    if len(parts) < 4:
        logging.warning(f"Incomplete GPS data: {gps_string}")
        return None
    
    try:
        lat = float(parts[0][:2]) + float(parts[0][2:]) / 60
        if parts[1] == 'S':
            lat = -lat
        
        lon = float(parts[2][:3]) + float(parts[2][3:]) / 60
        if parts[3] == 'W':
            lon = -lon
        
        return lat, lon
    except Exception as e:
        logging.error(f"Error parsing GPS data: {e}")
        return None

def write_to_influxdb(lat, lon):
    timestamp = int(time.time() * 1000000000)  # nanosecond precision
    
    try:
        gps_point = Point("gps_location") \
            .tag("host", myhost) \
            .field("latitude", lat) \
            .field("longitude", lon) \
            .field("geolocation", f"{lat},{lon}") \
            .time(timestamp)
        
        write_api.write(bucket=INFLUXDB_BUCKET, record=gps_point)
        logging.info(f"Data written to InfluxDB: Lat: {lat}, Lon: {lon}")
    except Exception as e:
        logging.error(f"Failed to write to InfluxDB: {e}")

def send_at(command, back, timeout):
    try:
        ser.write((command + '\r\n').encode())
        time.sleep(timeout)
        if ser.inWaiting():
            time.sleep(0.01)
            rec_buff = ser.read(ser.inWaiting()).decode()
            if back in rec_buff:
                gps_data = rec_buff.split('+CGPSINFO: ')[1].split('\r\n')[0]
                logging.debug(f"Raw GPS data: {gps_data}")
                parsed_data = parse_gps_data(gps_data)
                if parsed_data:
                    lat, lon = parsed_data
                    logging.info(f"GPS: Lat: {lat:.6f}, Lon: {lon:.6f}")
                    write_to_influxdb(lat, lon)
                    return 1
            else:
                logging.warning(f"Expected response not found. Received: {rec_buff}")
        else:
            logging.warning("No data received from GPS module")
    except Exception as e:
        logging.error(f"Error communicating with GPS module: {e}")
    return 0

def get_gps_position():
    return send_at('AT+CGPSINFO', '+CGPSINFO:', 1)

def initialize_gps():
    logging.info('Starting GPS')
    if send_at('AT+CGPS=1', 'OK', 1):
        logging.info("GPS module initialized successfully")
    else:
        logging.error("Failed to initialize GPS module")
    time.sleep(2)

# Main execution
initialize_gps()
logging.info("Getting GPS position...")
if not get_gps_position():
    logging.warning("Failed to get GPS position")

# Clean up
ser.close()
GPIO.cleanup()
client.close()
logging.info("GPS tracking completed. Goodbye!")