from __future__ import print_function
import datetime
import dateutil.parser
import pickle
import json
import os.path
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request

from server import db
from database.models import Calendar as dbCalendar

# If modifying these scopes, delete the file token.pickle.
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'

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

class Event:
    def __init__(self, name_, start_, end_):
        self.name = name_
        self.eventColorId = None
        self.start = start_
        self.end = end_
        self.colorHex = '#adfff5'

        if self.start == None or self.end == None :
            self.allDay = True
        else:
            self.allDay = False

    def startDateTime(self):
        if self.allDay:
            return None
        return self.jsonFromDT(self.start)

    def stopDateTime(self):
        if self.allDay:
            return None
        return self.jsonFromDT(self.end)

    def jsonFromDT(self, string):
        sdt = dateutil.parser.parse(string)
        data = {
            'date': {
            'year': sdt.year,
            'month': sdt.month,
            'day': sdt.day
            },
            'time': {
            'hour': sdt.hour,
            'minute': sdt.minute,
            'second': sdt.second
            }
        }
        return data

    def print(self):
        if self.allDay:
            print(self.name + "All Day")


def calendarCredentials(token = None):
    creds = None
    # The file token.pickle stores the user's access and refresh tokens, and is
    # created automatically when the authorization flow completes for the first
    # time.

    if token == None:
        if os.path.exists('token.pickle'):
            with open('token.pickle', 'rb') as token:
                token.seek(0)
                creds = pickle.load(token)
    
    else:
        creds = pickle.load(token)

    # If there are no (valid) credentials available, let the user log in.
    if not creds or not creds.valid:
        if creds and creds.expired and creds.refresh_token:
            creds.refresh(Request())
        else:
            flow = InstalledAppFlow.from_client_secrets_file(
                'credentials.json', SCOPES)
            creds = flow.run_local_server(port=1234)
        # Save the credentials for the next run
        with open('token.pickle', 'wb') as token:
            pickle.dump(creds, token)

    service = build('calendar', 'v3', credentials=creds)
    
    return service
    
def updateCalendars(user, calendars, colors):
    
    COLORS_FILE = os.path.join(os.path.dirname(__file__), 'colors.json')
    with open(COLORS_FILE) as f:
        colormap = json.load(f)
    
    # add all new calendars into the database
    # TODO update existing Name and Calendar ( do this in User class at db? )
    # Take care, that you don't overwrite the custom color selection of the user
    for calendar in calendars:
        if not user.hasCalendar(calendar.calendarId):
            color = fromColorIdGetColor(calendar.color, colormap, colors)
            c = dbCalendar(calendar_id=calendar.calendarId, 
                           name = calendar.name,
                           toggle = "False",
                           color = color)
            db.session.add(c)
            user.calendars.append(c)

    db.session.commit()
    
def calendarsFromDb(user):
    pyCalendars = []
    for calendar in user.calendars:
        name = (calendar.name[:16] + '..') if len(calendar.name)> 18 else calendar.name
        calendarId = calendar.calendar_id
        toggle = calendar.toggle
        color = calendar.color

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

    return pyCalendars


def purgeCalendars(calendars, visibleCalendars):
    purged = []
    for calendar in calendars:
        if calendar.calendarId in visibleCalendars:
            purged.append(calendar)
    return purged


def toCalendarColorId(colormap, colorId):
    for remap in colormap['eventRemap']:
        if remap['from'] == colorId:
            return remap['to']

    print(f"failed with {colorId}")
    return colorId

def toNaturalColor(colormap, orgColor):
    for remap in colormap['colors']:
        if remap['api'] == orgColor:
            return remap['natural']

    print(f"failed with {orgColor}")
    return orgColor

def colorizeEvents(events, colors):
    COLORS_FILE = os.path.join(os.path.dirname(__file__), 'colors.json')
    with open(COLORS_FILE) as f:
        colormap = json.load(f)
        
    for event in events:
        print(event.colorHex, flush=True) 
        if event.eventColorId != None:
            event.colorHex = forEventGetColor(event, colormap, colors)

# this function is only used once for calendar generation stuff
def fromColorIdGetColor(color, colormap, colors):
    return toNaturalColor(colormap, colors['calendar'][color]['background'])

def forEventGetColor(event, colormap, colors):
    calColorId = toCalendarColorId(colormap, event.eventColorId)
    bg = colors['calendar'][calColorId]['background']     
    return toNaturalColor(colormap, bg)

def toJson(events):
    data = {}
    data['kind'] = 'calendar#events'
    data['events'] = []

    for event in events:
        if event.allDay:
            continue

        data['events'].append({
            'name': event.name,
            'isAllDay': event.allDay,
            'color': event.colorHex,
            'startDateTime': event.startDateTime(),
            'stopDateTime': event.stopDateTime()
            })

    return data

def printColors(colors):
    for i in range(1, 25):
        col = colors['event'][str(i)]['background']
        print(f"{i}: {col}")

def main():
    generateJsonFromCalendarEntries()


def getTimeStamps():

    # define today and tomorrow
    now = datetime.datetime.now(datetime.timezone.utc).astimezone()
    today = now.replace(hour=0, minute=0, second = 0).isoformat() 
    tomorrow = now.replace(hour=23, minute=59, second=59).isoformat() # + '+01:00'
    twodaysfromnow = datetime.datetime.today() + datetime.timedelta(days=2)
    twodaysfromnow = twodaysfromnow.replace(hour=23, minute=59, second=59).astimezone().isoformat()
    
    return today, twodaysfromnow

def generateJsonFromCalendarEntries(events, colors):
    
    # fix all colors in events that have a different event color
    colorizeEvents(events, colors)
    # if not events:
    #    print('No upcoming events found.')

    return toJson(events)

if __name__ == '__main__':
    main()