from datetime import timedelta

from django.conf import settings
from django.test.signals import setting_changed
from django.utils.translation import gettext_lazy as _
from rest_framework.settings import APISettings as _APISettings

from .utils import format_lazy

USER_SETTINGS = getattr(settings, 'SIMPLE_JWT', None)

DEFAULTS = {
    'ACCESS_TOKEN_LIFETIME': timedelta(minutes=5),
    'REFRESH_TOKEN_LIFETIME': timedelta(days=1),
    'ROTATE_REFRESH_TOKENS': False,
    'BLACKLIST_AFTER_ROTATION': False,
    'UPDATE_LAST_LOGIN': False,

    'ALGORITHM': 'HS256',
    'SIGNING_KEY': settings.SECRET_KEY,
    'VERIFYING_KEY': None,
    'AUDIENCE': None,
    'ISSUER': None,
    'JWK_URL': None,
    'LEEWAY': 0,

    'AUTH_HEADER_TYPES': ('Bearer',),
    'AUTH_HEADER_NAME': 'HTTP_AUTHORIZATION',
    'USER_ID_FIELD': 'id',
    'USER_ID_CLAIM': 'user_id',
    'USER_AUTHENTICATION_RULE': 'rest_framework_simplejwt.authentication.default_user_authentication_rule',

    'AUTH_TOKEN_CLASSES': ('rest_framework_simplejwt.tokens.AccessToken',),
    'TOKEN_TYPE_CLAIM': 'token_type',

    'JTI_CLAIM': 'jti',
    'TOKEN_USER_CLASS': 'rest_framework_simplejwt.models.TokenUser',

    'SLIDING_TOKEN_REFRESH_EXP_CLAIM': 'refresh_exp',
    'SLIDING_TOKEN_LIFETIME': timedelta(minutes=5),
    'SLIDING_TOKEN_REFRESH_LIFETIME': timedelta(days=1),
}

IMPORT_STRINGS = (
    'AUTH_TOKEN_CLASSES',
    'TOKEN_USER_CLASS',
    'USER_AUTHENTICATION_RULE',
)

REMOVED_SETTINGS = (
    'AUTH_HEADER_TYPE',
    'AUTH_TOKEN_CLASS',
    'SECRET_KEY',
    'TOKEN_BACKEND_CLASS',
)


class APISettings(_APISettings):  # pragma: no cover
    def __check_user_settings(self, user_settings):
        SETTINGS_DOC = 'https://django-rest-framework-simplejwt.readthedocs.io/en/latest/settings.html'

        for setting in REMOVED_SETTINGS:
            if setting in user_settings:
                raise RuntimeError(format_lazy(
                    _("The '{}' setting has been removed. Please refer to '{}' for available settings."),
                    setting, SETTINGS_DOC,
                ))

        return user_settings


api_settings = APISettings(USER_SETTINGS, DEFAULTS, IMPORT_STRINGS)


def reload_api_settings(*args, **kwargs):  # pragma: no cover
    global api_settings

    setting, value = kwargs['setting'], kwargs['value']

    if setting == 'SIMPLE_JWT':
        api_settings = APISettings(value, DEFAULTS, IMPORT_STRINGS)


setting_changed.connect(reload_api_settings)