"""
This file contains celery tasks for email marketing signal handler.
"""
import logging
import time

from celery import task
from django.contrib.auth.models import User

from email_marketing.models import EmailMarketingConfiguration

from sailthru.sailthru_client import SailthruClient
from sailthru.sailthru_error import SailthruClientError

log = logging.getLogger(__name__)


# pylint: disable=not-callable
@task(bind=True, default_retry_delay=3600, max_retries=24)
def update_user(self, username, new_user=False, activation=False):
    """
    Adds/updates Sailthru profile information for a user.
     Args:
        username(str): A string representation of user identifier
    Returns:
        None
    """
    email_config = EmailMarketingConfiguration.current()
    if not email_config.enabled:
        return

    # get user
    user = User.objects.select_related('profile').get(username=username)
    if not user:
        log.error("User not found during Sailthru update %s", username)
        return

    # get profile
    profile = user.profile
    if not profile:
        log.error("User profile not found during Sailthru update %s", username)
        return

    sailthru_client = SailthruClient(email_config.sailthru_key, email_config.sailthru_secret)
    try:
        sailthru_response = sailthru_client.api_post("user",
                                                     _create_sailthru_user_parm(user, profile, new_user, email_config))
    except SailthruClientError as exc:
        log.error("Exception attempting to add/update user %s in Sailthru - %s", username, unicode(exc))
        raise self.retry(exc=exc,
                         countdown=email_config.sailthru_retry_interval,
                         max_retries=email_config.sailthru_max_retries)

    if not sailthru_response.is_ok():
        error = sailthru_response.get_error()
        # put out error and schedule retry
        log.error("Error attempting to add/update user in Sailthru: %s", error.get_message())
        raise self.retry(countdown=email_config.sailthru_retry_interval,
                         max_retries=email_config.sailthru_max_retries)

    # if activating user, send welcome email
    if activation and email_config.sailthru_activation_template:
        try:
            sailthru_response = sailthru_client.api_post("send",
                                                         {"email": user.email,
                                                          "template": email_config.sailthru_activation_template})
        except SailthruClientError as exc:
            log.error("Exception attempting to send welcome email to user %s in Sailthru - %s", username, unicode(exc))
            raise self.retry(exc=exc,
                             countdown=email_config.sailthru_retry_interval,
                             max_retries=email_config.sailthru_max_retries)

        if not sailthru_response.is_ok():
            error = sailthru_response.get_error()
            # probably an invalid template name, just put out error
            log.error("Error attempting to send welcome email to user in Sailthru: %s", error.get_message())


# pylint: disable=not-callable
@task(bind=True, default_retry_delay=3600, max_retries=24)
def update_user_email(self, username, old_email):
    """
    Adds/updates Sailthru when a user email address is changed
     Args:
        username(str): A string representation of user identifier
        old_email(str): Original email address
    Returns:
        None
    """
    email_config = EmailMarketingConfiguration.current()
    if not email_config.enabled:
        return

    # get user
    user = User.objects.get(username=username)
    if not user:
        log.error("User not found duing Sailthru update %s", username)
        return

    # ignore if email not changed
    if user.email == old_email:
        return

    sailthru_parms = {"id": old_email, "key": "email", "keysconflict": "merge", "keys": {"email": user.email}}

    try:
        sailthru_client = SailthruClient(email_config.sailthru_key, email_config.sailthru_secret)
        sailthru_response = sailthru_client.api_post("user", sailthru_parms)
    except SailthruClientError as exc:
        log.error("Exception attempting to update email for %s in Sailthru - %s", username, unicode(exc))
        raise self.retry(exc=exc,
                         countdown=email_config.sailthru_retry_interval,
                         max_retries=email_config.sailthru_max_retries)

    if not sailthru_response.is_ok():
        error = sailthru_response.get_error()
        log.error("Error attempting to update user email address in Sailthru: %s", error.get_message())
        raise self.retry(countdown=email_config.sailthru_retry_interval,
                         max_retries=email_config.sailthru_max_retries)


def _create_sailthru_user_parm(user, profile, new_user, email_config):
    """
    Create sailthru user create/update parms from user + profile.
    """
    sailthru_user = {'id': user.email, 'key': 'email'}
    sailthru_vars = {'username': user.username,
                     'activated': int(user.is_active),
                     'joined_date': user.date_joined.strftime("%Y-%m-%d")}
    sailthru_user['vars'] = sailthru_vars
    sailthru_vars['last_changed_time'] = int(time.time())

    if profile:
        sailthru_vars['fullname'] = profile.name
        sailthru_vars['gender'] = profile.gender
        sailthru_vars['education'] = profile.level_of_education
        # age is not useful since it is not automatically updated
        #sailthru_vars['age'] = profile.age or -1
        if profile.year_of_birth:
            sailthru_vars['year_of_birth'] = profile.year_of_birth
        sailthru_vars['country'] = unicode(profile.country.code)

    # if new user add to list
    if new_user and email_config.sailthru_new_user_list:
        sailthru_user['lists'] = {email_config.sailthru_new_user_list: 1}

    return sailthru_user