import django_filters
from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType
from django.db.models import Q

from dcim.models import DeviceRole, DeviceType, Platform, Region, Site, SiteGroup
from netbox.filtersets import BaseFilterSet, ChangeLoggedModelFilterSet
from tenancy.models import Tenant, TenantGroup
from utilities.filters import ContentTypeFilter, MultiValueCharFilter, MultiValueNumberFilter
from virtualization.models import Cluster, ClusterGroup
from .choices import *
from .models import *


__all__ = (
    'ConfigContextFilterSet',
    'ContentTypeFilterSet',
    'CustomLinkFilterSet',
    'ExportTemplateFilterSet',
    'ImageAttachmentFilterSet',
    'JournalEntryFilterSet',
    'LocalConfigContextFilterSet',
    'ObjectChangeFilterSet',
    'TagFilterSet',
    'WebhookFilterSet',
)

EXACT_FILTER_TYPES = (
    CustomFieldTypeChoices.TYPE_BOOLEAN,
    CustomFieldTypeChoices.TYPE_DATE,
    CustomFieldTypeChoices.TYPE_INTEGER,
    CustomFieldTypeChoices.TYPE_SELECT,
)


class WebhookFilterSet(BaseFilterSet):
    content_types = ContentTypeFilter()
    http_method = django_filters.MultipleChoiceFilter(
        choices=WebhookHttpMethodChoices
    )

    class Meta:
        model = Webhook
        fields = [
            'id', 'content_types', 'name', 'type_create', 'type_update', 'type_delete', 'payload_url', 'enabled',
            'http_method', 'http_content_type', 'secret', 'ssl_verification', 'ca_file_path',
        ]


class CustomFieldFilterSet(django_filters.FilterSet):
    content_types = ContentTypeFilter()

    class Meta:
        model = CustomField
        fields = ['id', 'content_types', 'name', 'required', 'filter_logic', 'weight']


class CustomLinkFilterSet(BaseFilterSet):

    class Meta:
        model = CustomLink
        fields = ['id', 'content_type', 'name', 'link_text', 'link_url', 'weight', 'group_name', 'new_window']


class ExportTemplateFilterSet(BaseFilterSet):

    class Meta:
        model = ExportTemplate
        fields = ['id', 'content_type', 'name']


class ImageAttachmentFilterSet(BaseFilterSet):
    created = django_filters.DateTimeFilter()
    content_type = ContentTypeFilter()

    class Meta:
        model = ImageAttachment
        fields = ['id', 'content_type_id', 'object_id', 'name']


class JournalEntryFilterSet(ChangeLoggedModelFilterSet):
    q = django_filters.CharFilter(
        method='search',
        label='Search',
    )
    created = django_filters.DateTimeFromToRangeFilter()
    assigned_object_type = ContentTypeFilter()
    created_by_id = django_filters.ModelMultipleChoiceFilter(
        queryset=User.objects.all(),
        label='User (ID)',
    )
    created_by = django_filters.ModelMultipleChoiceFilter(
        field_name='created_by__username',
        queryset=User.objects.all(),
        to_field_name='username',
        label='User (name)',
    )
    kind = django_filters.MultipleChoiceFilter(
        choices=JournalEntryKindChoices
    )

    class Meta:
        model = JournalEntry
        fields = ['id', 'assigned_object_type_id', 'assigned_object_id', 'created', 'kind']

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(comments__icontains=value)


class TagFilterSet(ChangeLoggedModelFilterSet):
    q = django_filters.CharFilter(
        method='search',
        label='Search',
    )
    content_type = MultiValueCharFilter(
        method='_content_type'
    )
    content_type_id = MultiValueNumberFilter(
        method='_content_type_id'
    )

    class Meta:
        model = Tag
        fields = ['id', 'name', 'slug', 'color']

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(
            Q(name__icontains=value) |
            Q(slug__icontains=value)
        )

    def _content_type(self, queryset, name, values):
        ct_filter = Q()

        # Compile list of app_label & model pairings
        for value in values:
            try:
                app_label, model = value.lower().split('.')
                ct_filter |= Q(
                    app_label=app_label,
                    model=model
                )
            except ValueError:
                pass

        # Get ContentType instances
        content_types = ContentType.objects.filter(ct_filter)

        return queryset.filter(extras_taggeditem_items__content_type__in=content_types).distinct()

    def _content_type_id(self, queryset, name, values):

        # Get ContentType instances
        content_types = ContentType.objects.filter(pk__in=values)

        return queryset.filter(extras_taggeditem_items__content_type__in=content_types).distinct()


class ConfigContextFilterSet(ChangeLoggedModelFilterSet):
    q = django_filters.CharFilter(
        method='search',
        label='Search',
    )
    region_id = django_filters.ModelMultipleChoiceFilter(
        field_name='regions',
        queryset=Region.objects.all(),
        label='Region',
    )
    region = django_filters.ModelMultipleChoiceFilter(
        field_name='regions__slug',
        queryset=Region.objects.all(),
        to_field_name='slug',
        label='Region (slug)',
    )
    site_group = django_filters.ModelMultipleChoiceFilter(
        field_name='site_groups__slug',
        queryset=SiteGroup.objects.all(),
        to_field_name='slug',
        label='Site group (slug)',
    )
    site_group_id = django_filters.ModelMultipleChoiceFilter(
        field_name='site_groups',
        queryset=SiteGroup.objects.all(),
        label='Site group',
    )
    site_id = django_filters.ModelMultipleChoiceFilter(
        field_name='sites',
        queryset=Site.objects.all(),
        label='Site',
    )
    site = django_filters.ModelMultipleChoiceFilter(
        field_name='sites__slug',
        queryset=Site.objects.all(),
        to_field_name='slug',
        label='Site (slug)',
    )
    device_type_id = django_filters.ModelMultipleChoiceFilter(
        field_name='device_types',
        queryset=DeviceType.objects.all(),
        label='Device type',
    )
    role_id = django_filters.ModelMultipleChoiceFilter(
        field_name='roles',
        queryset=DeviceRole.objects.all(),
        label='Role',
    )
    role = django_filters.ModelMultipleChoiceFilter(
        field_name='roles__slug',
        queryset=DeviceRole.objects.all(),
        to_field_name='slug',
        label='Role (slug)',
    )
    platform_id = django_filters.ModelMultipleChoiceFilter(
        field_name='platforms',
        queryset=Platform.objects.all(),
        label='Platform',
    )
    platform = django_filters.ModelMultipleChoiceFilter(
        field_name='platforms__slug',
        queryset=Platform.objects.all(),
        to_field_name='slug',
        label='Platform (slug)',
    )
    cluster_group_id = django_filters.ModelMultipleChoiceFilter(
        field_name='cluster_groups',
        queryset=ClusterGroup.objects.all(),
        label='Cluster group',
    )
    cluster_group = django_filters.ModelMultipleChoiceFilter(
        field_name='cluster_groups__slug',
        queryset=ClusterGroup.objects.all(),
        to_field_name='slug',
        label='Cluster group (slug)',
    )
    cluster_id = django_filters.ModelMultipleChoiceFilter(
        field_name='clusters',
        queryset=Cluster.objects.all(),
        label='Cluster',
    )
    tenant_group_id = django_filters.ModelMultipleChoiceFilter(
        field_name='tenant_groups',
        queryset=TenantGroup.objects.all(),
        label='Tenant group',
    )
    tenant_group = django_filters.ModelMultipleChoiceFilter(
        field_name='tenant_groups__slug',
        queryset=TenantGroup.objects.all(),
        to_field_name='slug',
        label='Tenant group (slug)',
    )
    tenant_id = django_filters.ModelMultipleChoiceFilter(
        field_name='tenants',
        queryset=Tenant.objects.all(),
        label='Tenant',
    )
    tenant = django_filters.ModelMultipleChoiceFilter(
        field_name='tenants__slug',
        queryset=Tenant.objects.all(),
        to_field_name='slug',
        label='Tenant (slug)',
    )
    tag = django_filters.ModelMultipleChoiceFilter(
        field_name='tags__slug',
        queryset=Tag.objects.all(),
        to_field_name='slug',
        label='Tag (slug)',
    )

    class Meta:
        model = ConfigContext
        fields = ['id', 'name', 'is_active']

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(
            Q(name__icontains=value) |
            Q(description__icontains=value) |
            Q(data__icontains=value)
        )


#
# Filter for Local Config Context Data
#

class LocalConfigContextFilterSet(django_filters.FilterSet):
    local_context_data = django_filters.BooleanFilter(
        method='_local_context_data',
        label='Has local config context data',
    )

    def _local_context_data(self, queryset, name, value):
        return queryset.exclude(local_context_data__isnull=value)


class ObjectChangeFilterSet(BaseFilterSet):
    q = django_filters.CharFilter(
        method='search',
        label='Search',
    )
    time = django_filters.DateTimeFromToRangeFilter()
    changed_object_type = ContentTypeFilter()
    user_id = django_filters.ModelMultipleChoiceFilter(
        queryset=User.objects.all(),
        label='User (ID)',
    )
    user = django_filters.ModelMultipleChoiceFilter(
        field_name='user__username',
        queryset=User.objects.all(),
        to_field_name='username',
        label='User name',
    )

    class Meta:
        model = ObjectChange
        fields = [
            'id', 'user', 'user_name', 'request_id', 'action', 'changed_object_type_id', 'changed_object_id',
            'object_repr',
        ]

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(
            Q(user_name__icontains=value) |
            Q(object_repr__icontains=value)
        )


#
# Job Results
#

class JobResultFilterSet(BaseFilterSet):
    q = django_filters.CharFilter(
        method='search',
        label='Search',
    )
    created = django_filters.DateTimeFilter()
    completed = django_filters.DateTimeFilter()
    status = django_filters.MultipleChoiceFilter(
        choices=JobResultStatusChoices,
        null_value=None
    )

    class Meta:
        model = JobResult
        fields = [
            'id', 'created', 'completed', 'status', 'user', 'obj_type', 'name'
        ]

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(
            Q(user__username__icontains=value)
        )


#
# ContentTypes
#

class ContentTypeFilterSet(django_filters.FilterSet):

    class Meta:
        model = ContentType
        fields = ['id', 'app_label', 'model']