main.py

# imports
import sys
import requests
import os
import user_detection
import hue_integration
import blynk_integration
import time_checks
from datetime import time
from time import sleep
from huesdk import Hue
from datetime import datetime, timedelta
from sense_hat import SenseHat
from dotenv import load_dotenv
import os

# loading contents of .env
load_dotenv('.env')

# retrieving api key from .env
apiKey = os.getenv('apiKey')

#declarations for use with api call and user checking functionality
origin = 'W23H6N1'
destination = 'X91PD32'
userPresent = True

# sensehat variables
sense = SenseHat()
sense.clear()
green = (0, 255, 0)
red = (255,0,0)
yellow = (255, 255, 0)
blue = (0,0,200)

# api call
apiUrl = f'https://maps.googleapis.com/maps/api/distancematrix/json?origins={origin}&destinations={destination}&key={apiKey}&departure_time=now'

'''
individual function for each journey status. Each function changes the sense display, hue light and blynk messages. Status blue also writes to json/db and ends the programme
in each of these functions, ETA is converted back to a full datetime object, averageOffset from time_checks is converted to a timedelta object and is then added to ETA in the new
adjustedETA variable. The sensehat then displays this variable thus giving the user the impression that they need to leave earlier if they have an offset.
'''
def statusGreen(ETA):
    hue_integration.hueGreen()
    ETA = datetime.combine(datetime.today(), ETA)
    averageOffset = timedelta(seconds=time_checks.averageOffset)
    adjustedETA = ETA + averageOffset
    sense.show_message(f'ETA: {adjustedETA.hour}:{adjustedETA.minute:02}', text_colour=green)        
    blynk_integration.blynk.virtual_write(1, f'ETA: {adjustedETA.hour}:{adjustedETA.minute:02}')
    blynk_integration.blynk.virtual_write(2, 0)
    print(f'Actual ETA: {ETA.hour}:{ETA.minute:02}')

def statusYellow(ETA):
    hue_integration.hueYellow()
    ETA = datetime.combine(datetime.today(), ETA)
    averageOffset = timedelta(seconds=time_checks.averageOffset)
    adjustedETA = ETA + averageOffset
    sense.show_message(f'ETA: {adjustedETA.hour}:{adjustedETA.minute:02}', text_colour=yellow)
    blynk_integration.blynk.virtual_write(1, f'ETA: {adjustedETA.hour}:{adjustedETA.minute:02}')
    blynk_integration.blynk.virtual_write(2, 1)
    print(f'Actual ETA: {ETA.hour}:{ETA.minute:02}')

def statusRed(ETA):
    hue_integration.hueRed()
    ETA = datetime.combine(datetime.today(), ETA)
    averageOffset = timedelta(seconds=time_checks.averageOffset)
    adjustedETA = ETA + averageOffset
    sense.show_message(f'ETA: {adjustedETA.hour}:{adjustedETA.minute:02}', text_colour=red)
    blynk_integration.blynk.virtual_write(1, f'ETA: {adjustedETA.hour}:{adjustedETA.minute:02}')
    blynk_integration.blynk.virtual_write(2, 2)
    print(f'Actual ETA: {ETA.hour}:{ETA.minute:02}')

def statusBlue(ETA):
    hue_integration.hueBlue()
    sense.show_message('ON THEIR WAY', text_colour=blue)
    blynk_integration.blynk.virtual_write(2, 3)
    hue_integration.hueDefault()
    hue_integration.hue.off()
    time_checks.offsetCalculation(ETA)

# while loop which executes upon successful detection of user on local network via mac address check
while userPresent:
    try:
        # variables declarations re current time and then conversion to minutes and hours
        currentDate = datetime.now()
        timeInSeconds = (currentDate.hour * 3600) + (currentDate.minute * 60) + currentDate.second

        # initialising the response and data variables 
        response = requests.get(apiUrl)
        data = response.json()
        
        # core conditional of application 
        if data['status'] == 'OK':
            blynk_integration.blynk.run()
            blynk_integration.blynk.virtual_write(2, 4)
            hue_integration.hue.on()
            # variables are created and seconds converted to minutes and hours from api
            durationInTraffic = data['rows'][0]['elements'][0]['duration_in_traffic']['value']
            estimatedArrivalTimeInSeconds = timeInSeconds + durationInTraffic
            estimatedArrivalDate = datetime.utcfromtimestamp(estimatedArrivalTimeInSeconds)
            hoursUTC = estimatedArrivalDate.hour
            minutesUTC = estimatedArrivalDate.minute
            ETA = time(hour=hoursUTC, minute=minutesUTC)
            if user_detection.find_devices():
                userPresent = True
                print("Successful connection to phone. User is yet to leave")
                sleep(.5)
                # conditional effecting the colour of lights and sensedisplay
                if ETA <= time_checks.optimalArrival:
                    statusGreen(ETA)
                elif ETA > time_checks.optimalArrival and ETA <= time_checks.cuttingItClose:
                    statusYellow(ETA)
                else:
                    statusRed(ETA)
            # if user is not on network, departure is inferred and sensehat displays message in addition to lamp powering down
            else:
                print("No connection. User is on their way to work!")
                userPresent = False
                statusBlue(ETA)
                break
        else:
            print('Unable to retrieve distance matrix. Check your origin, destination, and API key.')
    except Exception as error:
        print('Error:', str(error))