#TODO: All Google/iCloud Calendar syncing logic here

import google_auth_oauthlib.flow
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from googleapiclient.errors import HttpError
import os
import json
import datetime



from .database import TodoDatabase

data = TodoDatabase()


from datetime import datetime, time, timedelta
import pytz
from zoneinfo import ZoneInfo
from datetime import timezone

def midnight_UTC(offset):

    # Construct a timezone object
    tz = pytz.timezone('America/Toronto')

    # Work out today/now as a timezone-aware datetime
    today = datetime.now(tz)

    # Adjust by the offset. Note that that adding 1 day might actually move us 23 or 25
    # hours into the future, depending on daylight savings. This works because the {today}
    # variable is timezone aware
    target_day = today + timedelta(days=1) * offset

    # Discard hours, minutes, seconds and microseconds
    midnight_aware = tz.localize(
        datetime.combine(target_day, time(0, 0, 0, 0)), is_dst=None)

    # Convert to UTC
    midnight_UTC = midnight_aware.astimezone(pytz.utc)

    return midnight_UTC



class SyncData():
	def __init__(self):
		self.SCOPES = ['https://www.googleapis.com/auth/calendar.readonly']
		self.creds = None

		self.get_new_creds()
		self.get_calendar_events()


	def get_new_creds(self, code=""):
		"""Returns True if successfully obtains credentials,
		otherwise throws errors according to functions called, unless
		code='' in which case if no saved credentials are found, returns False
		"""
		if os.path.exists('token.json'):
			self.creds = Credentials.from_authorized_user_file('token.json', self.SCOPES)
		# else:
			# flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
			#     'client_secret.json',
			#     scopes=['https://www.googleapis.com/auth/calendar.readonly'],
			#     redirect_uri="postmessage"
			#     # state=state
			# )

			# creds = flow.fetch_token(code=googleCode.code)
			# print(creds)
			# with open("token.json", 'w') as token:
			#     token.write(creds.to_json())

		if not self.creds or not self.creds.valid:
			if self.creds and self.creds.expired and self.creds.refresh_token:
				self.creds.refresh(Request())
			else:
				if code == "":
					return False
				# flow = InstalledAppFlow.from_client_secrets_file(
					# 'credentials.json', SCOPES)
				# creds = flow.run_local_server(port=0)

				flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
					'client_secret.json',
					scopes=self.SCOPES,
					redirect_uri="postmessage"
					# state=state
				)
				flow.fetch_token(code=code)
				self.creds = flow.credentials
				# print(creds)

				# Save the credentials for the next run
				with open('token.json', 'w') as token:
					token.write(self.creds.to_json())
					# json.dump(token, creds)
		return True


	def get_calendar_events(self, day=None):
		self.get_new_creds()

		# now = datetime.now()
		# if day:
		# 	now = datetime.datetime.strptime(day, "%Y-%m-%d")
		# else:
		# 	now = datetime.datetime.now()
		# day_start = now.replace(hour=0, minute=0, second=0, microsecond=0)
		# day_end = day_start + datetime.timedelta(hours=24)
		# day_start = day_start.isoformat() + "Z"
		# day_end = day_end.isoformat() + "Z"

		if day:
			pass
		else:
			# day_start = midnight_UTC(0).isoformat() + "Z"
			# day_end = midnight_UTC(1).isoformat() + "Z"
			day_start = datetime.combine(datetime.now(tz=ZoneInfo("America/Toronto")).date(), time(0, 0), tzinfo=ZoneInfo("America/Toronto"))
			day_end = day_start + timedelta(hours=23,minutes=59)
			# day_start_for = day_start.astimezone(ZoneInfo("UTC")).isoformat() + "Z"
			# day_end_for = day_end.astimezone(ZoneInfo("UTC")).isoformat() + "Z"
			day_start_for = day_start.astimezone(ZoneInfo("UTC")).strftime('%Y-%m-%dT%H:%M:%S.%fZ')
			day_end_for = day_end.astimezone(ZoneInfo("UTC")).strftime('%Y-%m-%dT%H:%M:%S.%fZ')

			# print(day_start.tzname())
			print(day_start)
			print(day_end)
			print(day_start.astimezone(ZoneInfo("UTC")).strftime('%Y-%m-%dT%H:%M:%S.%fZ'))
			print(day_end.astimezone(ZoneInfo("UTC")).strftime('%Y-%m-%dT%H:%M:%S.%fZ'))
			print(datetime.utcnow().isoformat() + 'Z')


		try:
			service = build('calendar', 'v3', credentials=self.creds)

			# Call the Calendar API
			# now = datetime.datetime.utcnow().isoformat() + 'Z'  # 'Z' indicates UTC time
			print('Getting all upcoming events for time range: ' + day_start_for + " to " + day_end_for)
			events_result = service.events().list(calendarId='primary', timeMin=day_start_for, timeMax=day_end_for,
												  singleEvents=True, orderBy='startTime').execute()
			events = events_result.get('items', [])

			if not events:
				print('No upcoming events found.')
				return

			# Prints the start and name of the next 10 events
			# event format: {'kind': 'calendar#event', 'etag': '"3386046190326000"', 'id': '0migcv6t729ph1kirhiauej3eh', 'status': 'confirmed', 'htmlLink': 'https://www.google.com/calendar/event?eid=MG1pZ2N2NnQ3MjlwaDFraXJoaWF1ZWozZWggYmFtLmltLnNhbUBt', 'created': '2023-08-26T04:11:35.000Z', 'updated': '2023-08-26T04:11:35.163Z', 'summary': 'test', 'creator': {'email': 'bam.im.sam@gmail.com', 'self': True}, 'organizer': {'email': 'bam.im.sam@gmail.com', 'self': True}, 'start': {'dateTime': '2023-08-27T14:30:00-04:00', 'timeZone': 'America/Toronto'}, 'end': {'dateTime': '2023-08-27T15:30:00-04:00', 'timeZone': 'America/Toronto'}, 'iCalUID': '0migcv6t729ph1kirhiauej3eh@google.com', 'sequence': 0, 'reminders': {'useDefault': True}, 'eventType': 'default'}
			for event in events:
				print(event)
				start = event['start'].get('dateTime', event['start'].get('date'))
				end = event['end'].get('dateTime', event['end'].get('date'))
				print(start, "->", end, event['summary'])

		except HttpError as error:
			print('An error occurred: %s' % error)



	#TODO: Obtain calendar data and save to local database, parse into printable content