import graphene
from graphene import resolve_only_args

from .data import getHero, getHuman, getCharacter, getDroid, Human as _Human, Droid as _Droid

Episode = graphene.Enum('Episode', dict(
    NEWHOPE = 4,
    EMPIRE = 5,
    JEDI = 6
))


def wrap_character(character):
    if isinstance(character, _Human): 
        return Human(character)
    elif isinstance(character, _Droid):
        return Droid(character)


class Character(graphene.Interface):
    id = graphene.IDField()
    name = graphene.StringField()
    friends = graphene.ListField('self')
    appearsIn = graphene.ListField(Episode)

    def resolve_friends(self, args, *_):
        return [wrap_character(getCharacter(f)) for f in self.instance.friends]


class Human(Character):
    homePlanet = graphene.StringField()


class Droid(Character):
    primaryFunction = graphene.StringField()


class Query(graphene.ObjectType):
    hero = graphene.Field(Character,
        episode = graphene.Argument(Episode)
    )
    human = graphene.Field(Human,
        id = graphene.Argument(graphene.String)
    )
    droid = graphene.Field(Droid,
        id = graphene.Argument(graphene.String)
    )

    class Meta:
        type_name = 'core.Query'

    @resolve_only_args
    def resolve_hero(self, episode):
        return wrap_character(getHero(episode))

    @resolve_only_args
    def resolve_human(self, id):
        return wrap_character(getHuman(id))

    @resolve_only_args
    def resolve_droid(self, id):
        return wrap_character(getDroid(id))


Schema = graphene.Schema(query=Query)