from rest_framework import serializers
from django.utils.translation import ugettext_lazy as _
from django.urls import reverse
from django.db.models import Q

from users.models.user import User
from ..models import Ticket


class RequestAssetPermTicketSerializer(serializers.ModelSerializer):
    ips = serializers.ListField(child=serializers.IPAddressField(), source='meta.ips',
                                default=list, label=_('IP group'))
    hostname = serializers.CharField(max_length=256, source='meta.hostname', default=None,
                                     allow_blank=True, label=_('Hostname'))
    system_user = serializers.CharField(max_length=256, source='meta.system_user', default='',
                                        allow_blank=True, label=_('System user'))
    date_start = serializers.DateTimeField(source='meta.date_start', allow_null=True,
                                           required=False, label=_('Date start'))
    date_expired = serializers.DateTimeField(source='meta.date_expired', allow_null=True,
                                             required=False, label=_('Date expired'))
    confirmed_assets = serializers.ListField(child=serializers.UUIDField(),
                                             source='meta.confirmed_assets',
                                             default=list, required=False,
                                             label=_('Confirmed assets'))
    confirmed_system_user = serializers.ListField(child=serializers.UUIDField(),
                                                  source='meta.confirmed_system_user',
                                                  default=list, required=False,
                                                  label=_('Confirmed system user'))
    assets_waitlist_url = serializers.SerializerMethodField()
    system_user_waitlist_url = serializers.SerializerMethodField()

    class Meta:
        model = Ticket
        mini_fields = ['id', 'title']
        small_fields = [
            'status', 'action', 'date_created', 'date_updated', 'system_user_waitlist_url',
            'type', 'type_display', 'action_display', 'ips', 'confirmed_assets',
            'date_start', 'date_expired', 'confirmed_system_user', 'hostname',
            'assets_waitlist_url', 'system_user'
        ]
        m2m_fields = [
            'user', 'user_display', 'assignees', 'assignees_display',
            'assignee', 'assignee_display'
        ]

        fields = mini_fields + small_fields + m2m_fields
        read_only_fields = [
            'user_display', 'assignees_display', 'type', 'user', 'status',
            'date_created', 'date_updated', 'action', 'id', 'assignee',
            'assignee_display',
        ]
        extra_kwargs = {
            'status': {'label': _('Status')},
            'action': {'label': _('Action')},
            'user_display': {'label': _('User')}
        }

    def validate_assignees(self, assignees):
        user = self.context['request'].user

        count = User.objects.filter(Q(related_admin_orgs__users=user) | Q(role=User.ROLE.ADMIN)).filter(
            id__in=[assignee.id for assignee in assignees]).distinct().count()

        if count != len(assignees):
            raise serializers.ValidationError(_('Must be organization admin or superuser'))
        return assignees

    def get_system_user_waitlist_url(self, instance: Ticket):
        if not self._is_assignee(instance):
            return None
        meta = instance.meta
        url = reverse('api-assets:system-user-list')
        query = meta.get('system_user', '')
        return '{}?search={}'.format(url, query)

    def get_assets_waitlist_url(self, instance: Ticket):
        if not self._is_assignee(instance):
            return None

        asset_api = reverse('api-assets:asset-list')
        query = ''

        meta = instance.meta
        ips = meta.get('ips', [])
        hostname = meta.get('hostname')

        if ips:
            query = '?ips=%s' % ','.join(ips)
        elif hostname:
            query = '?search=%s' % hostname

        return asset_api + query

    def create(self, validated_data):
        validated_data['type'] = self.Meta.model.TYPE_REQUEST_ASSET_PERM
        validated_data['user'] = self.context['request'].user
        self._pop_confirmed_fields()
        return super().create(validated_data)

    def save(self, **kwargs):
        meta = self.validated_data.get('meta', {})
        date_start = meta.get('date_start')
        if date_start:
            meta['date_start'] = date_start.strftime('%Y-%m-%d %H:%M:%S%z')

        date_expired = meta.get('date_expired')
        if date_expired:
            meta['date_expired'] = date_expired.strftime('%Y-%m-%d %H:%M:%S%z')
        return super().save(**kwargs)

    def update(self, instance, validated_data):
        new_meta = validated_data['meta']
        if not self._is_assignee(instance):
            self._pop_confirmed_fields()
        old_meta = instance.meta
        meta = {}
        meta.update(old_meta)
        meta.update(new_meta)
        validated_data['meta'] = meta

        return super().update(instance, validated_data)

    def _pop_confirmed_fields(self):
        meta = self.validated_data['meta']
        meta.pop('confirmed_assets', None)
        meta.pop('confirmed_system_user', None)

    def _is_assignee(self, obj: Ticket):
        user = self.context['request'].user
        return obj.is_assignee(user)


class AssigneeSerializer(serializers.Serializer):
    id = serializers.UUIDField()
    name = serializers.CharField()
    username = serializers.CharField()


class OrgAssigneeSerializer(serializers.Serializer):
    org_name = serializers.CharField()
    org_admins = AssigneeSerializer(many=True)