from datetime import datetime

import graphene
from graphene import relay
from graphene_django import DjangoObjectType
from graphene_django.filter import DjangoFilterConnectionField
from django.utils.dateformat import format

from basicknowledge.models import BasicKnowledge
from basicknowledge.queries import InstrumentNode
from books.models import Module
from books.schema.queries import ModuleNode
from users.models import User, SchoolClass


class SchoolClassNode(DjangoObjectType):
    pk = graphene.Int()

    class Meta:
        model = SchoolClass
        filter_fields = ['name']
        interfaces = (relay.Node,)

    def resolve_pk(self, *args, **kwargs):
        return self.id


class UserNode(DjangoObjectType):
    pk = graphene.Int()
    permissions = graphene.List(graphene.String)
    selected_class = graphene.Field(SchoolClassNode)
    expiry_date = graphene.String()

    class Meta:
        model = User
        filter_fields = ['username', 'email']
        only_fields = ['username', 'email', 'first_name', 'last_name', 'school_classes', 'last_module', 'avatar_url',
                       'selected_class', 'expiry_date']
        interfaces = (relay.Node,)

    def resolve_pk(self, info, **kwargs):
        return self.id

    def resolve_permissions(self, info):
        return self.get_all_permissions()

    def resolve_selected_class(self, info):
        return self.selected_class()

    def resolve_expiry_date(self, info):
        if not self.hep_id: # concerns users that already have an (old) account
            return format(datetime(2020, 7, 31), 'U')  # just set some expiry date
        else:
            return self.license_expiry_date


class UsersQuery(object):
    me = graphene.Field(UserNode)
    all_users = DjangoFilterConnectionField(UserNode)
    my_activity = DjangoFilterConnectionField(ModuleNode)
    my_instrument_activity = DjangoFilterConnectionField(InstrumentNode)

    def resolve_me(self, info, **kwargs):
        return info.context.user

    def resolve_all_users(self, info, **kwargs):
        if not info.context.user.is_superuser:
            return User.objects.none()
        else:
            return User.objects.all()

    def resolve_my_activity(self, info, **kwargs):
        return Module.objects.all()

    def resolve_my_instrument_activity(self, info, **kwargs):
        return BasicKnowledge.objects.all()


class AllUsersQuery(object):
    me = graphene.Field(UserNode)
    all_users = DjangoFilterConnectionField(UserNode)

    def resolve_all_users(self, info, **kwargs):
        if not info.context.user.is_superuser:
            return User.objects.none()
        else:
            return User.objects.all()