import os.path

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

# If modifying these scopes, delete the file token.json.
SCOPES = ["https://www.googleapis.com/auth/gmail.readonly"]

TOKEN_PATH = os.path.expanduser("~/.memgpt/gmail_token.json")
CREDENTIALS_PATH = os.path.expanduser("~/.memgpt/google_api_credentials.json")


def main():
    """Shows basic usage of the Gmail API.
    Lists the user's Gmail labels.
    """
    creds = None
    # The file token.json stores the user's access and refresh tokens, and is
    # created automatically when the authorization flow completes for the first
    # time.
    if os.path.exists(TOKEN_PATH):
        creds = Credentials.from_authorized_user_file(TOKEN_PATH, SCOPES)
    # 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_PATH, SCOPES)
            creds = flow.run_local_server(port=0)
        # Save the credentials for the next run
        with open(TOKEN_PATH, "w") as token:
            token.write(creds.to_json())

    try:
        # Call the Gmail API
        service = build("gmail", "v1", credentials=creds)
        results = service.users().labels().list(userId="me").execute()
        labels = results.get("labels", [])

        if not labels:
            print("No labels found.")
            return
        print("Labels:")
        for label in labels:
            print(label["name"])

    except HttpError as error:
        # TODO(developer) - Handle errors from gmail API.
        print(f"An error occurred: {error}")


if __name__ == "__main__":
    main()