import google.oauth2.credentials
import google_auth_oauthlib.flow
import googleapiclient.discovery

import backend.caltojson as caltojson
from oauthlib.oauth2 import WebApplicationClient
import flask

# Python standard libraries
import json
import os
import sqlite3

# Third-party libraries
import flask
from flask import Flask, redirect, request, url_for
from flask_login import (
    LoginManager,
    current_user,
    login_required,
    login_user,
    logout_user,
)
import requests

from server.models import Calendar as dbCalendar

# Configuration
CLIENT_SECRETS_FILE = "certificate/client_secret.json"

# This OAuth 2.0 access scope allows for full read/write access to the
# authenticated user's account and requires requests to use an SSL connection.
SCOPES = ["https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile", "https://www.googleapis.com/auth/calendar.readonly", "openid"]
API_SERVICE_NAME = 'calendar'
API_VERSION = 'v3'

GOOGLE_CLIENT_ID ="377787187748-shuvi4iq5bi4gdet6q3ioataimobs4lh.apps.googleusercontent.com"
GOOGLE_CLIENT_SECRET = "Hu_YWmKsVKUcLwyeINYzdKfZ"
GOOGLE_DISCOVERY_URL = (
    "https://accounts.google.com/.well-known/openid-configuration"
)

# OAuth 2 client setup
client = WebApplicationClient(GOOGLE_CLIENT_ID)



def login():
    # Create flow instance to manage the OAuth 2.0 Authorization Grant Flow steps.
    flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
        CLIENT_SECRETS_FILE, scopes=SCOPES)
    # The URI created here must exactly match one of the authorized redirect URIs
    # for the OAuth 2.0 client, which you configured in the API Console. If this
    # value doesn't match an authorized URI, you will get a 'redirect_uri_mismatch'
    # error.
    flow.redirect_uri = request.base_url + "/callback"
    authorization_url, state = flow.authorization_url(
        # Enable offline access so that you can refresh an access token without
        # re-prompting the user for permission. Recommended for web server apps.
        access_type='offline',
        # Enable incremental authorization. Recommended as a best practice.
        include_granted_scopes='true')

    # Store the state so the callback can verify the auth server response.
    flask.session['state'] = state
    # Flask-Login helper to retrieve a user from our db
    return authorization_url

def verifyResponse():
    # Specify the state when creating the flow in the callback so that it can
    # verified in the authorization server response.
    state = flask.session['state']

    flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
        CLIENT_SECRETS_FILE, scopes=SCOPES, state=state)
    flow.redirect_uri = request.base_url

    # Use the authorization server's response to fetch the OAuth 2.0 tokens.
    authorization_response = flask.request.url
    flow.fetch_token(authorization_response=authorization_response)

    # Store credentials in the session.
    # ACTION ITEM: In a production app, you likely want to save these
    #              credentials in a persistent database instead.
    credentials = flow.credentials
    flask.session['credentials'] = credentials_to_dict(credentials)

    session = flow.authorized_session()
    return session 


def get_google_provider_cfg():
    return requests.get(GOOGLE_DISCOVERY_URL).json()

class Calendar:
    def __init__(self, name, toggle='False', color="#000000"):
        self.name = name
        self.color = color
        self.toggle=toggle

def calendarsFromDb():
    calendars = dbCalendar.getCalendars(dbCalendar, current_user.id)
    pyCalendars = []
    for calendar in calendars:
        name = calendar.name
        calId = calendar.calendar_id
        toggle = calendar.toggle
        color = calendar.color

        pyCalendars.append(Calendar(name, toggle, color))

    return pyCalendars


def getCalendarJson():
    if 'credentials' not in flask.session:
        return flask.redirect('login/google')

    # Load credentials from the session.
    credentials = google.oauth2.credentials.Credentials(
      **flask.session['credentials'])
    todaysCal = caltojson.generateJsonFromCalendarEntries(credentials)

    with open('./userinfo/' + current_user.id + '/calendarevents.json', 'w') as outfile:
        json.dump(todaysCal, outfile)

    return todaysCal


def updateCalendars():
    if 'credentials' not in flask.session:
        return flask.redirect('login/google')

  # Load credentials from the session.
    credentials = google.oauth2.credentials.Credentials(
        **flask.session['credentials'])

  
    calendars = caltojson.getCalendarList(credentials)

    for calendar in calendars:

        if dbCalendar.getCalendar(dbCalendar, current_user.id, calendar.calendarId) == None:
            dbCalendar.create(dbCalendar, current_user.id, calendar.calendarId, calendar.summary, calendar.color)

    print("updated Calendars")

    # Save credentials back to session in case access token was refreshed.
    # ACTION ITEM: In a production app, you likely want to save these
    #              credentials in a persistent database instead.
    flask.session['credentials'] = credentials_to_dict(credentials)


def credentials_to_dict(credentials):
  return {'token': credentials.token,
          'refresh_token': credentials.refresh_token,
          'token_uri': credentials.token_uri,
          'client_id': credentials.client_id,
          'client_secret': credentials.client_secret,
          'scopes': credentials.scopes}