import datetime
from googleapiclient.discovery import build

from oauth2client import client
from oauth2client import tools
from oauth2client.file import Storage


import httplib2
import os

import argparse

import gapi

flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()

HOUR = datetime.timedelta(seconds=60 ** 2)


class API:
    def __init__(
        self,
        service,
        scopes,
        app_name,
        client_secret_file=os.path.join(gapi.state_dir, "client_secret.json"),
        credentials_dir=gapi.state_dir,
        version="v3",
    ):
        self.service_name = service
        self.app_name = app_name
        self.client_secret_file = client_secret_file
        self.credentials_dir = credentials_dir
        self.scopes = scopes
        self._service = None
        self._service_settime = None
        self.version = version

    def get_credentials(self):

        credential_path = os.path.join(self.credentials_dir, "token.json")

        store = Storage(credential_path)
        credentials = store.get()
        if not credentials or credentials.invalid:
            flow = client.flow_from_clientsecrets(self.client_secret_file, self.scopes)
            flow.user_agent = self.app_name
            if flags:
                credentials = tools.run_flow(flow, store, flags)
            else:
                credentials = tools.run(flow, store)
            print("Storing credentials to " + credential_path)
        return credentials

    def build_service(self):
        credentials = self.get_credentials()

        http = credentials.authorize(httplib2.Http())

        service = build(
            self.service_name, self.version, http=http, cache_discovery=False
        )
        return service

    def _needs_renewal(self):
        now = datetime.datetime.today()
        if self._service_settime:
            return (now - self._service_settime) > HOUR
        else:
            return True

    @property
    def service(self):
        if self._needs_renewal():
            service = self.build_service()
            self._service = service
            self._service_settime = datetime.datetime.today()
            return service
        else:
            return self._service