"""passbook audit models"""
from django.conf import settings
from django.contrib.auth.models import AnonymousUser
from django.contrib.postgres.fields import JSONField
from django.core.exceptions import ValidationError
from django.db import models
from django.utils.translation import gettext as _
from structlog import get_logger

from passbook.lib.models import UUIDModel
from passbook.lib.utils.http import get_client_ip

LOGGER = get_logger()

class Event(UUIDModel):
    """An individual audit log event"""

    ACTION_LOGIN = 'login'
    ACTION_LOGIN_FAILED = 'login_failed'
    ACTION_LOGOUT = 'logout'
    ACTION_AUTHORIZE_APPLICATION = 'authorize_application'
    ACTION_SUSPICIOUS_REQUEST = 'suspicious_request'
    ACTION_SIGN_UP = 'sign_up'
    ACTION_PASSWORD_RESET = 'password_reset' # noqa # nosec
    ACTION_INVITE_CREATED = 'invitation_created'
    ACTION_INVITE_USED = 'invitation_used'
    ACTIONS = (
        (ACTION_LOGIN, ACTION_LOGIN),
        (ACTION_LOGIN_FAILED, ACTION_LOGIN_FAILED),
        (ACTION_LOGOUT, ACTION_LOGOUT),
        (ACTION_AUTHORIZE_APPLICATION, ACTION_AUTHORIZE_APPLICATION),
        (ACTION_SUSPICIOUS_REQUEST, ACTION_SUSPICIOUS_REQUEST),
        (ACTION_SIGN_UP, ACTION_SIGN_UP),
        (ACTION_PASSWORD_RESET, ACTION_PASSWORD_RESET),
        (ACTION_INVITE_CREATED, ACTION_INVITE_CREATED),
        (ACTION_INVITE_USED, ACTION_INVITE_USED),
    )

    user = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, on_delete=models.SET_NULL)
    action = models.TextField(choices=ACTIONS)
    date = models.DateTimeField(auto_now_add=True)
    app = models.TextField()
    context = JSONField(default=dict, blank=True)
    request_ip = models.GenericIPAddressField()
    created = models.DateTimeField(auto_now_add=True)

    @staticmethod
    def create(action, request, **kwargs):
        """Create Event from arguments"""
        client_ip = get_client_ip(request)
        if not hasattr(request, 'user'):
            user = None
        else:
            user = request.user
        if isinstance(user, AnonymousUser):
            user = kwargs.get('user', None)
        entry = Event.objects.create(
            action=action,
            user=user,
            # User 255.255.255.255 as fallback if IP cannot be determined
            request_ip=client_ip or '255.255.255.255',
            context=kwargs)
        LOGGER.debug("Created Audit entry", action=action,
                     user=user, from_ip=client_ip, context=kwargs)
        return entry

    def save(self, *args, **kwargs):
        if not self._state.adding:
            raise ValidationError("you may not edit an existing %s" % self._meta.model_name)
        super().save(*args, **kwargs)

    class Meta:

        verbose_name = _('Audit Entry')
        verbose_name_plural = _('Audit Entries')