import logging
from eventemitter import EventEmitter
from steam.steamid import SteamID, intBase
from steam.enums import EResult, EFriendRelationship
from steam.enums.emsg import EMsg
from steam.core.msg import MsgProto


class Friends(object):
    def __init__(self, *args, **kwargs):
        super(Friends, self).__init__(*args, **kwargs)

        #: SteamFriendlist instance
        self.friends = SteamFriendlist(self, logger_name="%s.friends" % self.__class__.__name__)

class SteamFriendlist(EventEmitter):
    """SteamFriendlist is an object that keeps state of user's friend list.
    It's essentially a :class:`list` of :class:`.SteamUser`.
    You can iterate over it, check if it contains a particular ``steam id``,
    or get :class:`.SteamUser` for a ``steam id``.
    """
    EVENT_READY = 'ready'
    """Friend list is ready for use
    """
    EVENT_FRIEND_INVITE = 'friend_invite'
    """New or existing friend invite

    :param user: steam user instance
    :type user: :class:`.SteamUser`
    """
    EVENT_FRIEND_NEW = 'friend_new'
    """Friendship established (after being accepted, or accepting)

    :param user: steam user instance
    :type user: :class:`.SteamUser`
    """
    EVENT_FRIEND_REMOVED = 'friend_removed'
    """No longer a friend (removed by either side)

    :param user: steam user instance
    :type user: :class:`.SteamUser`
    """
    EVENT_FRIEND_ADD_RESULT = 'friend_add_result'
    """Result response after adding a friend

    :param eresult: result
    :param type: :class:`.EResult`
    :param steam_id: steam id
    :param type: :class:`.SteamID`
    """

    ready = False  #: indicates whether friend list is ready for use

    def __init__(self, client, logger_name='SteamFriendList'):
        self._LOG = logging.getLogger(logger_name)
        self._fr = {}
        self._steam = client

        self._steam.on(EMsg.ClientAddFriendResponse, self._handle_add_friend_result)
        self._steam.on(EMsg.ClientFriendsList, self._handle_friends_list)
        self._steam.on(self._steam.EVENT_DISCONNECTED, self._handle_disconnect)

    def emit(self, event, *args):
        if event is not None:
            self._LOG.debug("Emit event: %s" % repr(event))
        EventEmitter.emit(self, event, *args)

    def _handle_disconnect(self):
        self.ready = False
        self._fr.clear()

    def _handle_add_friend_result(self, message):
        eresult = EResult(message.body.eresult)
        steam_id = SteamID(message.body.steam_id_added)
        self.emit(self.EVENT_FRIEND_ADD_RESULT, eresult, steam_id)

    def _handle_friends_list(self, message):
        incremental = message.body.bincremental
        if incremental == False:
            self._fr.clear()

        steamids_to_check = set()

        # update internal friends list
        for friend in message.body.friends:
            steamid = SteamID(friend.ulfriendid)

            if steamid.type != steamid.EType.Individual:
                continue

            suser = self._steam.get_user(steamid, False)
            rel = EFriendRelationship(friend.efriendrelationship)

            if steamid not in self._fr:
                self._fr[suser] = suser
                suser.relationship = rel
                steamids_to_check.add(steamid)

                if rel in (2,4):  # RequestRecipient = 2, RequestInitiator = 4
                    if rel == EFriendRelationship.RequestRecipient:
                        self.emit(self.EVENT_FRIEND_INVITE, suser)
            else:
                oldrel, suser.relationship = suser.relationship, rel

                if rel == EFriendRelationship.No:
                    self.emit(self.EVENT_FRIEND_REMOVED, self._fr.pop(suder))
                elif oldrel in (2,4) and rel == EFriendRelationship.Friend:
                    self.emit(self.EVENT_FRIEND_NEW, suser)

        # request persona state for any new entries
        if steamids_to_check:
            self._steam.request_persona_state(steamids_to_check)

        if not self.ready:
            self.ready = True
            self.emit(self.EVENT_READY)

    def __repr__(self):
        return "<%s %d users>" % (
            self.__class__.__name__,
            len(self._fr),
            )

    def __len__(self):
        return len(self._fr)

    def __iter__(self):
        return iter(self._fr)

    def __list__(self):
        return list(self._fr)

    def __getitem__(self, key):
        return self._fr[key]

    def __contains__(self, friend):
        return friend in self._fr

    def add(self, steamid_or_accountname_or_email):
        """
        Add/Accept a steam user to be your friend.
        When someone sends you an invite, use this method to accept it.

        :param steamid_or_accountname_or_email: steamid, account name, or email
        :type steamid_or_accountname_or_email: :class:`int`, :class:`.SteamID`, :class:`SteamUser`, :class:`str`

        .. note::
            Adding by email doesn't not work. It's only mentioned for the sake of completeness.
        """
        m = MsgProto(EMsg.ClientAddFriend)

        if isinstance(steamid_or_accountname_or_email, (intBase, int)):
            m.body.steamid_to_add = steamid_or_accountname_or_email
        else:
            m.body.accountname_or_email_to_add = steamid_or_accountname_or_email

        self._steam.send_job(m)

    def remove(self, steamid):
        """
        Remove a friend

        :param steamid: their steamid
        :type steamid: :class:`int`, :class:`.SteamID`, :class:`SteamUser`
        """
        self._steam.send(MsgProto(EMsg.ClientRemoveFriend), {'friendid': steamid})