import django_filters
import netaddr
from django.db.models import Q
from django.utils.translation import gettext as _
from netaddr.core import AddrFormatError

from dcim.base_filtersets import ScopedFilterSet
from dcim.filtersets import CommonInterfaceFilterSet
from dcim.models import Device, DeviceRole, MACAddress, Platform, Region, Site, SiteGroup
from extras.filtersets import LocalConfigContextFilterSet
from extras.models import ConfigTemplate
from ipam.filtersets import PrimaryIPFilterSet
from netbox.filtersets import NetBoxModelFilterSet, OrganizationalModelFilterSet, PrimaryModelFilterSet
from tenancy.filtersets import ContactModelFilterSet, TenancyFilterSet
from users.filterset_mixins import OwnerFilterMixin
from utilities.filters import MultiValueCharFilter, MultiValueMACAddressFilter, TreeNodeMultipleChoiceFilter
from utilities.filtersets import register_filterset

from .choices import *
from .models import *

__all__ = (
    'ClusterFilterSet',
    'ClusterGroupFilterSet',
    'ClusterTypeFilterSet',
    'VMInterfaceFilterSet',
    'VirtualDiskFilterSet',
    'VirtualMachineFilterSet',
    'VirtualMachineTypeFilterSet',
)


@register_filterset
class ClusterTypeFilterSet(OrganizationalModelFilterSet):

    class Meta:
        model = ClusterType
        fields = ('id', 'name', 'slug', 'description')


@register_filterset
class ClusterGroupFilterSet(OrganizationalModelFilterSet, ContactModelFilterSet):

    class Meta:
        model = ClusterGroup
        fields = ('id', 'name', 'slug', 'description')


@register_filterset
class ClusterFilterSet(PrimaryModelFilterSet, TenancyFilterSet, ScopedFilterSet, ContactModelFilterSet):
    group_id = django_filters.ModelMultipleChoiceFilter(
        queryset=ClusterGroup.objects.all(),
        distinct=False,
        label=_('Parent group (ID)'),
    )
    group = django_filters.ModelMultipleChoiceFilter(
        field_name='group__slug',
        queryset=ClusterGroup.objects.all(),
        distinct=False,
        to_field_name='slug',
        label=_('Parent group (slug)'),
    )
    type_id = django_filters.ModelMultipleChoiceFilter(
        queryset=ClusterType.objects.all(),
        distinct=False,
        label=_('Cluster type (ID)'),
    )
    type = django_filters.ModelMultipleChoiceFilter(
        field_name='type__slug',
        queryset=ClusterType.objects.all(),
        distinct=False,
        to_field_name='slug',
        label=_('Cluster type (slug)'),
    )
    status = django_filters.MultipleChoiceFilter(
        choices=ClusterStatusChoices,
        distinct=False,
        null_value=None
    )

    class Meta:
        model = Cluster
        fields = ('id', 'name', 'description', 'scope_id')

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


@register_filterset
class VirtualMachineTypeFilterSet(PrimaryModelFilterSet):
    default_platform_id = TreeNodeMultipleChoiceFilter(
        queryset=Platform.objects.all(),
        field_name='default_platform',
        lookup_expr='in',
        label=_('Default platform (ID)'),
    )
    default_platform = TreeNodeMultipleChoiceFilter(
        queryset=Platform.objects.all(),
        field_name='default_platform',
        to_field_name='slug',
        lookup_expr='in',
        label=_('Default platform (slug)'),
    )

    class Meta:
        model = VirtualMachineType
        fields = (
            'id',
            'name',
            'slug',
            'default_vcpus',
            'default_memory',
            'description',
            'virtual_machine_count',
        )

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

        return queryset.filter(
            Q(name__icontains=value) |
            Q(description__icontains=value) |
            Q(comments__icontains=value)
        )


@register_filterset
class VirtualMachineFilterSet(
    PrimaryModelFilterSet,
    TenancyFilterSet,
    ContactModelFilterSet,
    LocalConfigContextFilterSet,
    PrimaryIPFilterSet,
):
    virtual_machine_type_id = django_filters.ModelMultipleChoiceFilter(
        queryset=VirtualMachineType.objects.all(),
        distinct=False,
        label=_('Virtual machine type (ID)'),
    )
    virtual_machine_type = django_filters.ModelMultipleChoiceFilter(
        field_name='virtual_machine_type__slug',
        queryset=VirtualMachineType.objects.all(),
        distinct=False,
        to_field_name='slug',
        label=_('Virtual machine type (slug)'),
    )
    status = django_filters.MultipleChoiceFilter(
        choices=VirtualMachineStatusChoices,
        distinct=False,
        null_value=None
    )
    start_on_boot = django_filters.MultipleChoiceFilter(
        choices=VirtualMachineStartOnBootChoices,
        distinct=False,
        null_value=None
    )
    cluster_group_id = django_filters.ModelMultipleChoiceFilter(
        field_name='cluster__group',
        queryset=ClusterGroup.objects.all(),
        distinct=False,
        label=_('Cluster group (ID)'),
    )
    cluster_group = django_filters.ModelMultipleChoiceFilter(
        field_name='cluster__group__slug',
        queryset=ClusterGroup.objects.all(),
        distinct=False,
        to_field_name='slug',
        label=_('Cluster group (slug)'),
    )
    cluster_type_id = django_filters.ModelMultipleChoiceFilter(
        field_name='cluster__type',
        queryset=ClusterType.objects.all(),
        distinct=False,
        label=_('Cluster type (ID)'),
    )
    cluster_type = django_filters.ModelMultipleChoiceFilter(
        field_name='cluster__type__slug',
        queryset=ClusterType.objects.all(),
        distinct=False,
        to_field_name='slug',
        label=_('Cluster type (slug)'),
    )
    cluster_id = django_filters.ModelMultipleChoiceFilter(
        queryset=Cluster.objects.all(),
        distinct=False,
        label=_('Cluster (ID)'),
    )
    cluster = django_filters.ModelMultipleChoiceFilter(
        field_name='cluster__name',
        queryset=Cluster.objects.all(),
        distinct=False,
        to_field_name='name',
        label=_('Cluster'),
    )
    device_id = django_filters.ModelMultipleChoiceFilter(
        queryset=Device.objects.all(),
        distinct=False,
        label=_('Device (ID)'),
    )
    device = django_filters.ModelMultipleChoiceFilter(
        field_name='device__name',
        queryset=Device.objects.all(),
        distinct=False,
        to_field_name='name',
        label=_('Device'),
    )
    region_id = TreeNodeMultipleChoiceFilter(
        queryset=Region.objects.all(),
        field_name='site__region',
        lookup_expr='in',
        label=_('Region (ID)'),
    )
    region = TreeNodeMultipleChoiceFilter(
        queryset=Region.objects.all(),
        field_name='site__region',
        lookup_expr='in',
        to_field_name='slug',
        label=_('Region (slug)'),
    )
    site_group_id = TreeNodeMultipleChoiceFilter(
        queryset=SiteGroup.objects.all(),
        field_name='site__group',
        lookup_expr='in',
        label=_('Site group (ID)'),
    )
    site_group = TreeNodeMultipleChoiceFilter(
        queryset=SiteGroup.objects.all(),
        field_name='site__group',
        lookup_expr='in',
        to_field_name='slug',
        label=_('Site group (slug)'),
    )
    site_id = django_filters.ModelMultipleChoiceFilter(
        queryset=Site.objects.all(),
        distinct=False,
        label=_('Site (ID)'),
    )
    site = django_filters.ModelMultipleChoiceFilter(
        field_name='site__slug',
        queryset=Site.objects.all(),
        distinct=False,
        to_field_name='slug',
        label=_('Site (slug)'),
    )
    name = MultiValueCharFilter(
        lookup_expr='iexact'
    )
    role_id = TreeNodeMultipleChoiceFilter(
        queryset=DeviceRole.objects.all(),
        lookup_expr='in',
        label=_('Role (ID)'),
    )
    role = TreeNodeMultipleChoiceFilter(
        field_name='role',
        queryset=DeviceRole.objects.all(),
        lookup_expr='in',
        to_field_name='slug',
        label=_('Role (slug)'),
    )
    platform_id = TreeNodeMultipleChoiceFilter(
        queryset=Platform.objects.all(),
        field_name='platform',
        lookup_expr='in',
        label=_('Platform (ID)'),
    )
    platform = TreeNodeMultipleChoiceFilter(
        queryset=Platform.objects.all(),
        field_name='platform',
        lookup_expr='in',
        to_field_name='slug',
        label=_('Platform (slug)'),
    )
    mac_address = MultiValueMACAddressFilter(
        field_name='interfaces__mac_addresses__mac_address',
        label=_('MAC address'),
    )
    has_primary_ip = django_filters.BooleanFilter(
        method='_has_primary_ip',
        label=_('Has a primary IP'),
    )
    config_template_id = django_filters.ModelMultipleChoiceFilter(
        queryset=ConfigTemplate.objects.all(),
        distinct=False,
        label=_('Config template (ID)'),
    )

    class Meta:
        model = VirtualMachine
        fields = (
            'id', 'cluster', 'vcpus', 'memory', 'disk', 'description', 'interface_count', 'virtual_disk_count',
            'serial'
        )

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = Q(
            Q(name__icontains=value) |
            Q(description__icontains=value) |
            Q(comments__icontains=value) |
            Q(serial__icontains=value)
        )
        # If the given value looks like an IP address, look for primary IPv4/IPv6 assignments
        try:
            ipaddress = netaddr.IPNetwork(value)
            if ipaddress.version == 4:
                qs_filter |= Q(primary_ip4__address__host__inet=ipaddress.ip)
            elif ipaddress.version == 6:
                qs_filter |= Q(primary_ip6__address__host__inet=ipaddress.ip)
        except (AddrFormatError, ValueError):
            pass
        return queryset.filter(qs_filter)

    def _has_primary_ip(self, queryset, name, value):
        params = Q(primary_ip4__isnull=False) | Q(primary_ip6__isnull=False)
        if value:
            return queryset.filter(params)
        return queryset.exclude(params)


@register_filterset
class VMInterfaceFilterSet(CommonInterfaceFilterSet, OwnerFilterMixin, NetBoxModelFilterSet):
    cluster_id = django_filters.ModelMultipleChoiceFilter(
        field_name='virtual_machine__cluster',
        queryset=Cluster.objects.all(),
        distinct=False,
        label=_('Cluster (ID)'),
    )
    cluster = django_filters.ModelMultipleChoiceFilter(
        field_name='virtual_machine__cluster__name',
        queryset=Cluster.objects.all(),
        distinct=False,
        to_field_name='name',
        label=_('Cluster'),
    )
    virtual_machine_id = django_filters.ModelMultipleChoiceFilter(
        field_name='virtual_machine',
        queryset=VirtualMachine.objects.all(),
        distinct=False,
        label=_('Virtual machine (ID)'),
    )
    virtual_machine = django_filters.ModelMultipleChoiceFilter(
        field_name='virtual_machine__name',
        queryset=VirtualMachine.objects.all(),
        distinct=False,
        to_field_name='name',
        label=_('Virtual machine'),
    )
    parent_id = django_filters.ModelMultipleChoiceFilter(
        field_name='parent',
        queryset=VMInterface.objects.all(),
        distinct=False,
        label=_('Parent interface (ID)'),
    )
    bridge_id = django_filters.ModelMultipleChoiceFilter(
        field_name='bridge',
        queryset=VMInterface.objects.all(),
        distinct=False,
        label=_('Bridged interface (ID)'),
    )
    mac_address = MultiValueMACAddressFilter(
        field_name='mac_addresses__mac_address',
        label=_('MAC address'),
    )
    primary_mac_address_id = django_filters.ModelMultipleChoiceFilter(
        field_name='primary_mac_address',
        queryset=MACAddress.objects.all(),
        distinct=False,
        label=_('Primary MAC address (ID)'),
    )
    primary_mac_address = django_filters.ModelMultipleChoiceFilter(
        field_name='primary_mac_address__mac_address',
        queryset=MACAddress.objects.all(),
        distinct=False,
        to_field_name='mac_address',
        label=_('Primary MAC address'),
    )

    class Meta:
        model = VMInterface
        fields = ('id', 'name', 'enabled', 'mtu', 'mode', 'description')

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


@register_filterset
class VirtualDiskFilterSet(OwnerFilterMixin, NetBoxModelFilterSet):
    virtual_machine_id = django_filters.ModelMultipleChoiceFilter(
        field_name='virtual_machine',
        queryset=VirtualMachine.objects.all(),
        distinct=False,
        label=_('Virtual machine (ID)'),
    )
    virtual_machine = django_filters.ModelMultipleChoiceFilter(
        field_name='virtual_machine__name',
        queryset=VirtualMachine.objects.all(),
        distinct=False,
        to_field_name='name',
        label=_('Virtual machine'),
    )

    class Meta:
        model = VirtualDisk
        fields = ('id', 'name', 'size', 'description')

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