import traceback
from logging import getLogger

from django.core.exceptions import PermissionDenied, ObjectDoesNotExist as DJObjectDoesNotExist
from django.db.models.deletion import ProtectedError
from django.http import Http404
from django.utils.translation import gettext
from django.conf import settings
from rest_framework import exceptions
from rest_framework.response import Response
from rest_framework.views import set_rollback

from common.exceptions import JMSObjectDoesNotExist, ReferencedByOthers

logger = getLogger('drf_exception')
unexpected_exception_logger = getLogger('unexpected_exception')


def extract_object_name(exc, index=0):
    """
    `index` 是从 0 开始数的， 比如：
    `No User matches the given query.`
    提取 `User`，`index=1`
    """
    if exc.args:
        (msg, *others) = exc.args
    else:
        return gettext('Object')
    return gettext(msg.split(sep=' ', maxsplit=index + 1)[index])


def common_exception_handler(exc, context):
    if settings.DEBUG_DEV:
        logger.exception('Print traceback exception for Debug')
        traceback.print_exc()

    if isinstance(exc, Http404):
        exc = JMSObjectDoesNotExist(object_name=extract_object_name(exc, 1))
    elif isinstance(exc, PermissionDenied):
        exc = exceptions.PermissionDenied()
    elif isinstance(exc, DJObjectDoesNotExist):
        exc = JMSObjectDoesNotExist(object_name=extract_object_name(exc, 0))
    elif isinstance(exc, ProtectedError):
        exc = ReferencedByOthers()

    if isinstance(exc, exceptions.APIException):
        headers = {}
        if getattr(exc, 'auth_header', None):
            headers['WWW-Authenticate'] = exc.auth_header
        if getattr(exc, 'wait', None):
            headers['Retry-After'] = '%d' % exc.wait

        if isinstance(exc.detail, str) and isinstance(exc.get_codes(), str):
            data = {'detail': exc.detail, 'code': exc.get_codes()}
        else:
            data = exc.detail

        set_rollback()
        return Response(data, status=exc.status_code, headers=headers)
    else:
        unexpected_exception_logger.exception('')

    return None