from django.contrib.contenttypes.models import ContentType
from rest_framework import serializers

from circuits.choices import CircuitPriorityChoices, CircuitStatusChoices, VirtualCircuitTerminationRoleChoices
from circuits.constants import CIRCUIT_GROUP_ASSIGNMENT_MEMBER_MODELS, CIRCUIT_TERMINATION_TERMINATION_TYPES
from circuits.models import (
    Circuit, CircuitGroup, CircuitGroupAssignment, CircuitTermination, CircuitType, VirtualCircuit,
    VirtualCircuitTermination, VirtualCircuitType,
)
from dcim.api.serializers_.device_components import InterfaceSerializer
from dcim.api.serializers_.cables import CabledObjectSerializer
from netbox.api.fields import ChoiceField, ContentTypeField, RelatedObjectCountField
from netbox.api.gfk_fields import GFKSerializerField
from netbox.api.serializers import (
    NetBoxModelSerializer, OrganizationalModelSerializer, PrimaryModelSerializer, WritableNestedSerializer,
)
from netbox.choices import DistanceUnitChoices
from tenancy.api.serializers_.tenants import TenantSerializer
from .providers import ProviderAccountSerializer, ProviderNetworkSerializer, ProviderSerializer

__all__ = (
    'CircuitSerializer',
    'CircuitGroupAssignmentSerializer',
    'CircuitGroupSerializer',
    'CircuitTerminationSerializer',
    'CircuitTypeSerializer',
    'VirtualCircuitSerializer',
    'VirtualCircuitTerminationSerializer',
    'VirtualCircuitTypeSerializer',
)


class CircuitTypeSerializer(OrganizationalModelSerializer):

    # Related object counts
    circuit_count = RelatedObjectCountField('circuits')

    class Meta:
        model = CircuitType
        fields = [
            'id', 'url', 'display_url', 'display', 'name', 'slug', 'color', 'description', 'owner', 'comments', 'tags',
            'custom_fields', 'created', 'last_updated', 'circuit_count',
        ]
        brief_fields = ('id', 'url', 'display', 'name', 'slug', 'description', 'circuit_count')


class CircuitCircuitTerminationSerializer(WritableNestedSerializer):
    termination_type = ContentTypeField(
        queryset=ContentType.objects.filter(
            model__in=CIRCUIT_TERMINATION_TERMINATION_TYPES
        ),
        allow_null=True,
        required=False,
        default=None
    )
    termination_id = serializers.IntegerField(allow_null=True, required=False, default=None)
    termination = GFKSerializerField(read_only=True)

    class Meta:
        model = CircuitTermination
        fields = [
            'id', 'url', 'display_url', 'display', 'termination_type', 'termination_id', 'termination', 'port_speed',
            'upstream_speed', 'xconnect_id', 'description',
        ]


class CircuitGroupSerializer(OrganizationalModelSerializer):
    tenant = TenantSerializer(nested=True, required=False, allow_null=True)
    circuit_count = RelatedObjectCountField('assignments')

    class Meta:
        model = CircuitGroup
        fields = [
            'id', 'url', 'display_url', 'display', 'name', 'slug', 'description', 'tenant', 'owner', 'comments', 'tags',
            'custom_fields', 'created', 'last_updated', 'circuit_count'
        ]
        brief_fields = ('id', 'url', 'display', 'name')


class CircuitGroupAssignmentSerializer_(NetBoxModelSerializer):
    """
    Base serializer for group assignments under CircuitSerializer.
    """
    group = CircuitGroupSerializer(nested=True)
    priority = ChoiceField(choices=CircuitPriorityChoices, allow_blank=True, required=False)

    class Meta:
        model = CircuitGroupAssignment
        fields = [
            'id', 'url', 'display_url', 'display', 'group', 'priority', 'tags', 'created', 'last_updated',
        ]
        brief_fields = ('id', 'url', 'display', 'group', 'priority')


class CircuitSerializer(PrimaryModelSerializer):
    provider = ProviderSerializer(nested=True)
    provider_account = ProviderAccountSerializer(nested=True, required=False, allow_null=True, default=None)
    status = ChoiceField(choices=CircuitStatusChoices, required=False)
    type = CircuitTypeSerializer(nested=True)
    distance_unit = ChoiceField(choices=DistanceUnitChoices, allow_blank=True, required=False, allow_null=True)
    tenant = TenantSerializer(nested=True, required=False, allow_null=True)
    termination_a = CircuitCircuitTerminationSerializer(read_only=True, allow_null=True)
    termination_z = CircuitCircuitTerminationSerializer(read_only=True, allow_null=True)
    assignments = CircuitGroupAssignmentSerializer_(nested=True, many=True, required=False)

    class Meta:
        model = Circuit
        fields = [
            'id', 'url', 'display_url', 'display', 'cid', 'provider', 'provider_account', 'type', 'status', 'tenant',
            'install_date', 'termination_date', 'commit_rate', 'description', 'distance', 'distance_unit',
            'termination_a', 'termination_z', 'owner', 'comments', 'tags', 'custom_fields', 'created', 'last_updated',
            'assignments',
        ]
        brief_fields = ('id', 'url', 'display', 'provider', 'cid', 'description')


class CircuitTerminationSerializer(NetBoxModelSerializer, CabledObjectSerializer):
    circuit = CircuitSerializer(nested=True)
    termination_type = ContentTypeField(
        queryset=ContentType.objects.filter(
            model__in=CIRCUIT_TERMINATION_TERMINATION_TYPES
        ),
        allow_null=True,
        required=False,
        default=None
    )
    termination_id = serializers.IntegerField(allow_null=True, required=False, default=None)
    termination = GFKSerializerField(read_only=True)

    class Meta:
        model = CircuitTermination
        fields = [
            'id', 'url', 'display_url', 'display', 'circuit', 'term_side', 'termination_type', 'termination_id',
            'termination', 'port_speed', 'upstream_speed', 'xconnect_id', 'pp_info', 'description', 'mark_connected',
            'cable', 'cable_end', 'link_peers', 'link_peers_type', 'tags', 'custom_fields', 'created', 'last_updated',
            '_occupied',
        ]
        brief_fields = ('id', 'url', 'display', 'circuit', 'term_side', 'description', 'cable', '_occupied')


class CircuitGroupAssignmentSerializer(CircuitGroupAssignmentSerializer_):
    member_type = ContentTypeField(
        queryset=ContentType.objects.filter(CIRCUIT_GROUP_ASSIGNMENT_MEMBER_MODELS)
    )
    member = GFKSerializerField(read_only=True)

    class Meta:
        model = CircuitGroupAssignment
        fields = [
            'id', 'url', 'display_url', 'display', 'group', 'member_type', 'member_id', 'member', 'priority', 'tags',
            'created', 'last_updated',
        ]
        brief_fields = ('id', 'url', 'display', 'group', 'member_type', 'member_id', 'member', 'priority')


class VirtualCircuitTypeSerializer(OrganizationalModelSerializer):

    # Related object counts
    virtual_circuit_count = RelatedObjectCountField('virtual_circuits')

    class Meta:
        model = VirtualCircuitType
        fields = [
            'id', 'url', 'display_url', 'display', 'name', 'slug', 'color', 'description', 'owner', 'comments', 'tags',
            'custom_fields', 'created', 'last_updated', 'virtual_circuit_count',
        ]
        brief_fields = ('id', 'url', 'display', 'name', 'slug', 'description', 'virtual_circuit_count')


class VirtualCircuitSerializer(PrimaryModelSerializer):
    provider_network = ProviderNetworkSerializer(nested=True)
    provider_account = ProviderAccountSerializer(nested=True, required=False, allow_null=True, default=None)
    type = VirtualCircuitTypeSerializer(nested=True)
    status = ChoiceField(choices=CircuitStatusChoices, required=False)
    tenant = TenantSerializer(nested=True, required=False, allow_null=True)

    class Meta:
        model = VirtualCircuit
        fields = [
            'id', 'url', 'display_url', 'display', 'cid', 'provider_network', 'provider_account', 'type', 'status',
            'tenant', 'description', 'owner', 'comments', 'tags', 'custom_fields', 'created', 'last_updated',
        ]
        brief_fields = ('id', 'url', 'display', 'provider_network', 'cid', 'description')


class VirtualCircuitTerminationSerializer(NetBoxModelSerializer, CabledObjectSerializer):
    virtual_circuit = VirtualCircuitSerializer(nested=True)
    role = ChoiceField(choices=VirtualCircuitTerminationRoleChoices, required=False)
    interface = InterfaceSerializer(nested=True)

    class Meta:
        model = VirtualCircuitTermination
        fields = [
            'id', 'url', 'display_url', 'display', 'virtual_circuit', 'role', 'interface', 'description', 'tags',
            'custom_fields', 'created', 'last_updated',
        ]
        brief_fields = ('id', 'url', 'display', 'virtual_circuit', 'role', 'interface', 'description')