# Copyright (c) 2015 Ansible, Inc.
# All Rights Reserved.


# Django
from django.conf import settings
from django.db import models
from django.contrib.auth.models import User
from django.contrib.sessions.models import Session
from django.utils.timezone import now as tz_now
from django.utils.translation import gettext_lazy as _


# AWX
from awx.api.versioning import reverse
from awx.main.fields import AutoOneToOneField, ImplicitRoleField, OrderedManyToManyField
from awx.main.models.base import BaseModel, CommonModel, CommonModelNameNotUnique, CreatedModifiedModel, NotificationFieldsModel
from awx.main.models.rbac import (
    ROLE_SINGLETON_SYSTEM_ADMINISTRATOR,
    ROLE_SINGLETON_SYSTEM_AUDITOR,
)
from awx.main.models.unified_jobs import UnifiedJob
from awx.main.models.mixins import ResourceMixin, CustomVirtualEnvMixin, RelatedJobsMixin

__all__ = ['Organization', 'Team', 'Profile', 'UserSessionMembership']


class Organization(CommonModel, NotificationFieldsModel, ResourceMixin, CustomVirtualEnvMixin, RelatedJobsMixin):
    """
    An organization is the basic unit of multi-tenancy divisions
    """

    class Meta:
        app_label = 'main'
        ordering = ('name',)

    instance_groups = OrderedManyToManyField('InstanceGroup', blank=True, through='OrganizationInstanceGroupMembership')
    galaxy_credentials = OrderedManyToManyField(
        'Credential', blank=True, through='OrganizationGalaxyCredentialMembership', related_name='%(class)s_galaxy_credentials'
    )
    max_hosts = models.PositiveIntegerField(
        blank=True,
        default=0,
        help_text=_('Maximum number of hosts allowed to be managed by this organization.'),
    )
    notification_templates_approvals = models.ManyToManyField("NotificationTemplate", blank=True, related_name='%(class)s_notification_templates_for_approvals')
    default_environment = models.ForeignKey(
        'ExecutionEnvironment',
        null=True,
        blank=True,
        default=None,
        on_delete=models.SET_NULL,
        related_name='+',
        help_text=_('The default execution environment for jobs run by this organization.'),
    )

    admin_role = ImplicitRoleField(
        parent_role='singleton:' + ROLE_SINGLETON_SYSTEM_ADMINISTRATOR,
    )
    execute_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    project_admin_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    inventory_admin_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    credential_admin_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    workflow_admin_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    notification_admin_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    job_template_admin_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    execution_environment_admin_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    auditor_role = ImplicitRoleField(
        parent_role='singleton:' + ROLE_SINGLETON_SYSTEM_AUDITOR,
    )
    member_role = ImplicitRoleField(parent_role=['admin_role'])
    read_role = ImplicitRoleField(
        parent_role=[
            'member_role',
            'auditor_role',
            'execute_role',
            'project_admin_role',
            'inventory_admin_role',
            'workflow_admin_role',
            'notification_admin_role',
            'credential_admin_role',
            'job_template_admin_role',
            'approval_role',
            'execution_environment_admin_role',
        ],
    )
    approval_role = ImplicitRoleField(
        parent_role='admin_role',
    )

    def get_absolute_url(self, request=None):
        return reverse('api:organization_detail', kwargs={'pk': self.pk}, request=request)

    '''
    RelatedJobsMixin
    '''

    def _get_related_jobs(self):
        return UnifiedJob.objects.non_polymorphic().filter(organization=self)


class OrganizationGalaxyCredentialMembership(models.Model):
    organization = models.ForeignKey('Organization', on_delete=models.CASCADE)
    credential = models.ForeignKey('Credential', on_delete=models.CASCADE)
    position = models.PositiveIntegerField(
        null=True,
        default=None,
        db_index=True,
    )


class Team(CommonModelNameNotUnique, ResourceMixin):
    """
    A team is a group of users that work on common projects.
    """

    class Meta:
        app_label = 'main'
        unique_together = [('organization', 'name')]
        ordering = ('organization__name', 'name')

    organization = models.ForeignKey(
        'Organization',
        blank=False,
        null=False,
        on_delete=models.CASCADE,
        related_name='teams',
    )
    admin_role = ImplicitRoleField(
        parent_role='organization.admin_role',
    )
    member_role = ImplicitRoleField(
        parent_role='admin_role',
    )
    read_role = ImplicitRoleField(
        parent_role=['organization.auditor_role', 'member_role'],
    )

    def get_absolute_url(self, request=None):
        return reverse('api:team_detail', kwargs={'pk': self.pk}, request=request)


class Profile(CreatedModifiedModel):
    """
    Profile model related to User object. Currently stores LDAP DN for users
    loaded from LDAP.
    """

    class Meta:
        app_label = 'main'

    user = AutoOneToOneField('auth.User', related_name='profile', editable=False, on_delete=models.CASCADE)
    ldap_dn = models.CharField(
        max_length=1024,
        default='',
    )


class UserSessionMembership(BaseModel):
    """
    A lookup table for API session membership given user. Note, there is a
    different session created by channels for websockets using the same
    underlying model.
    """

    class Meta:
        app_label = 'main'

    user = models.ForeignKey('auth.User', related_name='+', blank=False, null=False, on_delete=models.CASCADE)
    session = models.OneToOneField(Session, related_name='+', blank=False, null=False, on_delete=models.CASCADE)
    created = models.DateTimeField(default=None, editable=False)

    @staticmethod
    def get_memberships_over_limit(user_id, now=None):
        if settings.SESSIONS_PER_USER == -1:
            return []
        if now is None:
            now = tz_now()
        query_set = UserSessionMembership.objects.select_related('session').filter(user_id=user_id).order_by('-created')
        non_expire_memberships = [x for x in query_set if x.session.expire_date > now]
        return non_expire_memberships[settings.SESSIONS_PER_USER :]


# Add get_absolute_url method to User model if not present.
if not hasattr(User, 'get_absolute_url'):

    def user_get_absolute_url(user, request=None):
        return reverse('api:user_detail', kwargs={'pk': user.pk}, request=request)

    User.add_to_class('get_absolute_url', user_get_absolute_url)