import logging
import urllib3
import json

from django_mailbox.transports.imap import ImapTransport
from django.conf import settings


logger = logging.getLogger(__name__)


class Office365Transport(ImapTransport):
    def connect(self, username, password):
        # Try to use oauth2 first.  It's much safer
        try:
            self._connect_oauth(username)
        except (TypeError, ValueError) as e:
            logger.warning("Couldn't do oauth2 because %s" % e)
            self.server = self.transport(self.hostname, self.port)
            typ, msg = self.server.login(username, password)
            self.server.select()

    def _connect_oauth(self, username):
        # username should be an email address that has already been authorized
        # for office365 access

        access_token = None
        while access_token is None:
            try:
                access_token = self.get_office365_access_token()
            except Exception as e:
                raise ValueError(
                    f"Could not acquire the access token for {username} exception details={e}"
                )

        auth_string = 'user={}\1auth=Bearer {}\1\1'.format(
            username,
            access_token
        )

        logger.info(f'[_connect_oauth] port = {self.port}')
        self.server = self.transport(self.hostname, self.port)
        logger.info(f'[_connect_oauth] hostname = {self.hostname}')
        logger.info(f'[_connect_oauth] auth string is: {auth_string}')
        typ, dat = self.server.authenticate("XOAUTH2", lambda x: auth_string)
        logger.info(f'[_connect_oauth] auth string is: {auth_string} and typ={typ} dat={dat}')
        self.server.select()

    def get_office365_access_token(self):
        url = f"https://login.microsoftonline.com/{settings.MICROSOFT_O365_TENENT_ID}/oauth2/v2.0/token"
        oauth_params = {
            "client_id": settings.MICROSOFT_O365_CLIENT_ID,
            "client_secret": settings.MICROSOFT_O365_CLIENT_SECRET,
            "grant_type": "client_credentials",
            "scope": "https://graph.microsoft.com/.default",
        }
        http = urllib3.PoolManager()
        response = http.request("POST", url, oauth_params)
        if response.status == 200:
            token = json.loads(response.data).get("access_token")
            logger.info(f"[get_office365_access_token] token aquired")
            return token
        else:
            raise Exception(
                f"[get_office365_access_token] Failed to authenticate with O365 {response.data}"
            )

# import logging
# import os

# from django.conf import settings

# from .base import EmailTransport, MessageParseError

# logger = logging.getLogger(__name__)


# class Office365Transport(EmailTransport):
#     def __init__(
#         self, hostname, username, archive='', folder=None
#     ):
#         self.integration_testing_subject = getattr(
#             settings,
#             'DJANGO_MAILBOX_INTEGRATION_TESTING_SUBJECT',
#             None
#         )
#         self.hostname = hostname
#         self.username = username
#         self.archive = archive
#         self.folder = folder

#     def connect(self):
#         try:
#             import O365
#         except ImportError:
#             raise ValueError(
#                 "Install o365 to use oauth2 auth for office365"
#             )

#         credentials = (settings.MICROSOFT_O365_CLIENT_ID, settings.MICROSOFT_O365_CLIENT_SECRET)

#         if not os.path.isdir(settings.O365_TOKEN_PATH):
#             os.mkdir(settings.O365_TOKEN_PATH)

#         token_path=os.path.join(settings.O365_TOKEN_PATH, 'token.txt')
#         self.account = O365.Account(credentials, auth_flow_type='credentials', tenant_id=settings.MICROSOFT_O365_TENENT_ID, token_path=token_path)
#         self.account.authenticate()

#         self.mailbox = self.account.mailbox(resource=self.username)
#         self.mailbox_folder = self.mailbox.inbox_folder()
#         if self.folder:
#             self.mailbox_folder = self.mailbox.get_folder(folder_name=self.folder)

#     def get_message(self, condition=None):
#         archive_folder = None
#         if self.archive:
#             archive_folder = self.mailbox.get_folder(folder_name=self.archive)
#             if not archive_folder:
#                 archive_folder = self.mailbox.create_child_folder(self.archive)

#         for o365message in self.mailbox_folder.get_messages(order_by='receivedDateTime'):
#             try:
#                 mime_content = o365message.get_mime_content()
#                 message = self.get_email_from_bytes(mime_content)

#                 if condition and not condition(message):
#                     continue

#                 yield message
#             except MessageParseError:
#                 continue

#             if self.archive and archive_folder:
#                 o365message.copy(archive_folder)

#             o365message.delete()
#         return