from django.utils.encoding import python_2_unicode_compatible
from esi.clients import esi_client_factory
from django.conf import settings
import evelink

@python_2_unicode_compatible
class Entity(object):
    def __init__(self, id, name):
        self.id = id
        self.name = name

    def __str__(self):
        return self.name

    def __repr__(self):
        return "<{} ({}): {}>".format(self.__class__.__name__, self.id, self.name)

    def __bool__(self):
        return bool(self.id)

    def __eq__(self, other):
        return self.id == other.id


class Corporation(Entity):
    def __init__(self, provider, id, name, ticker, ceo_id, members, alliance_id):
        super(Corporation, self).__init__(id, name)
        self.provider = provider
        self.ticker = ticker
        self.ceo_id = ceo_id
        self.members = members
        self.alliance_id = alliance_id

    @property
    def alliance(self):
        if self.alliance_id:
            return self.provider.get_alliance(self.alliance_id)
        return Entity(None, None)

    @property
    def ceo(self):
        return self.provider.get_character(self.ceo_id)


class Alliance(Entity):
    def __init__(self, provider, id, name, ticker, corp_ids):
        super(Alliance, self).__init__(id, name)
        self.provider = provider
        self.ticker = ticker
        self.corp_ids = corp_ids

    def corp(self, id):
        assert id in self.corp_ids
        return self.provider.get_corp(id)

    @property
    def corps(self):
        return sorted([self.corp(id) for id in self.corp_ids], key=lambda x: x.name)


class Character(Entity):
    def __init__(self, provider, id, name, corp_id, alliance_id):
        super(Character, self).__init__(id, name)
        self.provider = provider
        self.corp_id = corp_id
        self.alliance_id = alliance_id

    @property
    def corp(self):
        return self.provider.get_corp(self.corp_id)

    @property
    def alliance(self):
        if self.alliance_id:
            return self.provider.get_alliance(self.alliance_id)
        return Entity(None, None)


class EveProvider:
    def get_alliance(self, alliance_id):
        """
        :return: an Alliance object for the given ID
        """
        raise NotImplementedError()

    def get_corp(self, corp_id):
        """
        :return: a Corporation object for the given ID
        """
        raise NotImplementedError()

    def get_character(self, corp_id):
        """
        :return: a Character object for the given ID
        """
        raise NotImplementedError()


class EveSwaggerProvider(EveProvider):
    def __init__(self, token=None):
        self.client = esi_client_factory(token=token)

    def get_alliance(self, alliance_id):
        data = self.client.Alliance.get_alliances_alliance_id(alliance_id=alliance_id).result()
        corps = self.client.Alliance.get_alliances_alliance_id_corporations(alliance_id=alliance_id).result()
        model = Alliance(
            self,
            alliance_id,
            data['alliance_name'],
            data['ticker'],
            corps,
        )
        return model

    def get_corp(self, corp_id):
        data = self.client.Corporation.get_corporations_corporation_id(corporation_id=corp_id).result()
        model = Corporation(
            self,
            corp_id,
            data['corporation_name'],
            data['ticker'],
            data['ceo_id'],
            data['member_count'],
            data['alliance_id'] if 'alliance_id' in data else None,
        )
        return model

    def get_character(self, character_id):
        data = self.client.Character.get_characters_character_id(character_id=character_id).result()
        alliance_id = self.get_corp(data['corporation_id']).alliance_id
        model = Character(
            self,
            character_id,
            data['name'],
            data['corporation_id'],
            alliance_id,
        )
        return model


class EveXmlProvider(EveProvider):
    def __init__(self, api_key=None):
        """
        :param api_key: eveonline.EveApiKeyPair
        """
        self.api = evelink.api.API(api_key=(api_key.api_id, api_key.api_key)) if api_key else evelink.api.API()
        
    def get_alliance(self, id):
        api = evelink.eve.EVE(api=self.api)
        alliances = api.alliances().result
        results = alliances[int(id)]
        model = Alliance(
            self,
            id,
            results['name'],
            results['ticker'],
            results['member_corps'],
        )
        return model

    def get_corp(self, id):
        api = evelink.corp.Corp(api=self.api)
        corpinfo = api.corporation_sheet(corp_id=int(id)).result
        model = Corporation(
            self,
            id,
            corpinfo['name'],
            corpinfo['ceo']['id'],
            corpinfo['members']['current'],
            corpinfo['ticker'],
            corpinfo['alliance']['id'] if corpinfo['alliance'] else None,
        )
        return model

    def get_character(self, id):
        api = evelink.eve.EVE(api=self.api)
        charinfo = api.character_info_from_id(id).result
        model = Character(
            self,
            id,
            charinfo['name'],
            charinfo['corp']['id'],
            charinfo['alliance']['id'],
        )
        return model
            


class EveAdapter(EveProvider):
    """
    Redirects queries to appropriate data source.
    """
    def __init__(self, provider):
        self.provider = provider

    def __repr__(self):
        return "<{} ({})>".format(self.__class__.__name__, self.provider.__class__.__name__)

    def get_character(self, id):
        return self.provider.get_character(id)

    def get_corporation(self, id):
        return self.provider.get_corporation(id)

    def get_alliance(self, id):
        return self.provider.get_alliance(id)


def adapter_factory(source=settings.EVEONLINE_DATA_PROVIDER, **kwargs):
    if source == 'xml':
        return EveAdapter(EveXmlProvider(**kwargs))
    elif source == 'esi':
        return EveAdapter(EveSwaggerProvider(**kwargs))
    else:
        raise ValueError('Unrecognized data source.')