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from __future__ import print_function
import httplib2
import os

from apiclient import discovery
from oauth2client import client
from oauth2client import tools
from oauth2client.file import Storage
from apiclient import errors
try:
    import argparse
    flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
except ImportError:
    flags = None

import re

# If modifying these scopes, delete your previously saved credentials
# at CLIENT_SECRET_FILE and the CLIENT_SECRET_FILE will be regenerated
SCOPES = 'https://mail.google.com/'
CLIENT_SECRET_FILE = '/Users/Dave/.credentials/client_secret.json'

# I HAVE ADDED THE PROJECTOR PROJECT UNDER THE GMAIL API
# https://console.developers.google.com/apis/dashboard
APPLICATION_NAME = 'Projector'


def get_credentials(filename):
    """Gets valid user credentials from storage.

    If nothing has been stored, or if the stored credentials are invalid,
    the OAuth2 flow is completed to obtain the new credentials.

    **Key Arguments:**
        - ``filename`` -- differentiate between home and work emails.

    **Returns:**
        Credentials, the obtained credential.
    """

    home_dir = os.path.expanduser('~')
    credential_dir = os.path.join(home_dir, '.credentials')
    if not os.path.exists(credential_dir):
        os.makedirs(credential_dir)
    credential_path = os.path.join(credential_dir,
                                   filename)

    store = Storage(credential_path)
    credentials = store.get()
    if not credentials or credentials.invalid:
        flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
        flow.user_agent = APPLICATION_NAME
        if flags:
            credentials = tools.run_flow(flow, store, flags)
        else:  # Needed only for compatibility with Python 2.6
            credentials = tools.run(flow, store)
        print('Storing credentials to ' + credential_path)
    return credentials


def UpdateLabel(service, user_id, label_id, updated_label_object):
    """Update an existing Label.

    Args:
      service: Authorized Gmail API service instance.
      user_id: User's email address. The special value "me"
      can be used to indicate the authenticated user.
      label_id: ID of the Label to update.
      updated_label_object: Updated Label.

    Returns:
      Updated Label.
    """
    try:
        updated_label_object['id'] = label_id
        updated_label = (service.users().labels()
                         .update(userId=user_id, id=label_id,
                                 body=updated_label_object).execute())
        try:
            print('label id: %s - label name: %s' % (updated_label['id'],
                                                     updated_label['name'].encode("utf-8")))
        except:
            pass
        return updated_label
    except errors.HttpError, error:
        print('An error occurred: %s' % error)


def main():
    """Shows basic usage of the Gmail API.

    Creates a Gmail API service object and outputs a list of label names
    of the user's Gmail account.
    """

    for filename in ["home-gmail.json", "work-gmail.json"]:

        credentials = get_credentials(filename)
        http = credentials.authorize(httplib2.Http())
        service = discovery.build('gmail', 'v1', http=http)

        results = service.users().labels().list(
            userId='me').execute()
        labels = results.get('labels', [])

        if not labels:
            print('No labels found.')
        else:
            print('Labels:')
            for label in labels:
                name = label['name']

                skip = False
                for i in ["CATEGORY_", "["]:
                    if i in name:
                        skip = True
                if skip:
                    continue
                skip = False
                for i in ["TRASH", "DRAFT", "SPAM", "STARRED", "UNREAD", "INBOX", "SENT", "IMPORTANT", "CHAT"]:
                    if i == name:
                        skip = True
                if skip:
                    continue

                r = re.findall('([A-Z])', name)

                if len(r) or "-" in name or " " in name or ":" in name or "," in name:
                    name = name.encode("utf-8")
                    print("Renaming %(name)s" % locals())

                    label['name'] = label['name'].lower().replace(
                        "-", "_").replace(" ", "_").replace(":", "_").replace("__", "_").replace("__", "_").replace(",", "")
                    UpdateLabel(service, user_id="me", label_id=label[
                                'id'], updated_label_object=label)

        if labels:
            for label in labels:
                name = label['name']

                skip = False
                for i in ["@", "CATEGORY_"]:
                    if i in name:
                        skip = True
                if skip:
                    continue
                skip = False
                for i in ["TRASH", "DRAFT", "SPAM", "STARRED", "UNREAD", "INBOX", "SENT", "IMPORTANT", "CHAT"]:
                    if i == name:
                        skip = True
                if skip:
                    continue

                if "labelListVisibility" not in label or label["labelListVisibility"] != "labelShowIfUnread":
                    label["labelListVisibility"] = "labelShowIfUnread"
                    UpdateLabel(service, user_id="me", label_id=label[
                                'id'], updated_label_object=label)


if __name__ == '__main__':
    main()