#!/usr/bin/env python

__author__ = "Abhinav Sarkar <abhinav@abhinavsarkar.net>"
__version__ = "0.2"
__license__ = "GNU Lesser General Public License"
__package__ = "lastfm"

from lastfm.base import LastfmBase
from lastfm.mixin import mixin, chartable
from lastfm.decorators import cached_property, top_property

@chartable("artist")
@mixin("crawlable", "searchable", "cacheable", "property_adder")
class Tag(LastfmBase):
    """A class representing a tag."""
    class Meta(object):
        properties = ["name", "url", "streamable", "stats"]
        
    def init(self, api, **kwargs):
        if not isinstance(api, Api):
            raise InvalidParametersError("api reference must be supplied as an argument")
        
        self._api = api
        super(Tag, self).init(**kwargs)
        self._stats = hasattr(self, '_stats') and Stats(
                             subject = self,
                             count = self._stats.count,
                             rank = self._stats.rank
                             ) or None

    @cached_property
    def similar(self):
        """tags similar to this tag"""
        params = self._default_params({'method': 'tag.getSimilar'})
        data = self._api._fetch_data(params).find('similartags')
        return [
                Tag(
                    self._api,
                    subject = self,
                    name = t.findtext('name'),
                    url = t.findtext('url'),
                    streamable = (t.findtext('streamable') == "1"),
                    )
                for t in data.findall('tag')
                ]

    @top_property("similar")
    def most_similar(self):
        """most similar tag to this tag"""
        pass

    @cached_property
    def top_albums(self):
        """top albums for the tag"""
        params = self._default_params({'method': 'tag.getTopAlbums'})
        data = self._api._fetch_data(params).find('topalbums')
        return [
                Album(
                      self._api,
                      subject = self,
                      name = a.findtext('name'),
                      artist = Artist(
                                      self._api,
                                      subject = self,
                                      name = a.findtext('artist/name'),
                                      mbid = a.findtext('artist/mbid'),
                                      url = a.findtext('artist/url'),
                                      ),
                      mbid = a.findtext('mbid'),
                      url = a.findtext('url'),
                      image = dict([(i.get('size'), i.text) for i in a.findall('image')]),
                      stats = Stats(
                                    subject = a.findtext('name'),
                                    tagcount = a.findtext('tagcount') and int(a.findtext('tagcount')) or None,
                                    rank = a.attrib['rank'].strip() and int(a.attrib['rank']) or None
                                    )
                      )
                for a in data.findall('album')
                ]

    @top_property("top_albums")
    def top_album(self):
        """top album for the tag"""
        pass

    @cached_property
    def top_artists(self):
        """top artists for the tag"""
        params = self._default_params({'method': 'tag.getTopArtists'})
        data = self._api._fetch_data(params).find('topartists')
        return [
                Artist(
                       self._api,
                       subject = self,
                       name = a.findtext('name'),
                       mbid = a.findtext('mbid'),
                       stats = Stats(
                                     subject = a.findtext('name'),
                                     rank = a.attrib['rank'].strip() and int(a.attrib['rank']) or None,
                                     tagcount = a.findtext('tagcount') and int(a.findtext('tagcount')) or None
                                     ),
                       url = a.findtext('url'),
                       streamable = (a.findtext('streamable') == "1"),
                       image = dict([(i.get('size'), i.text) for i in a.findall('image')]),
                       )
                for a in data.findall('artist')
                ]

    @top_property("top_artists")
    def top_artist(self):
        """top artist for the tag"""
        pass

    @cached_property
    def top_tracks(self):
        """top tracks for the tag"""
        params = self._default_params({'method': 'tag.getTopTracks'})
        data = self._api._fetch_data(params).find('toptracks')
        return [
                Track(
                      self._api,
                      subject = self,
                      name = t.findtext('name'),
                      artist = Artist(
                                      self._api,
                                      subject = self,
                                      name = t.findtext('artist/name'),
                                      mbid = t.findtext('artist/mbid'),
                                      url = t.findtext('artist/url'),
                                      ),
                      mbid = t.findtext('mbid'),
                      stats = Stats(
                                    subject = t.findtext('name'),
                                    rank = t.attrib['rank'].strip() and int(t.attrib['rank']) or None,
                                    tagcount = t.findtext('tagcount') and int(t.findtext('tagcount')) or None
                                    ),
                      streamable = (t.findtext('streamable') == '1'),
                      full_track = (t.find('streamable').attrib['fulltrack'] == '1'),
                      image = dict([(i.get('size'), i.text) for i in t.findall('image')]),
                      )
                for t in data.findall('track')
                ]

    @top_property("top_tracks")
    def top_track(self):
        """top track for the tag"""
        pass

    @cached_property
    def playlist(self):
        return Playlist.fetch(self._api,
                              "lastfm://playlist/tag/%s/freetracks" % self.name)
   
    @staticmethod
    def get_top_tags(api):
        params = {'method': 'tag.getTopTags'}
        data = api._fetch_data(params).find('toptags')
        return [
                Tag(
                    api,
                    name = t.findtext('name'),
                    url = t.findtext('url'),
                    stats = Stats(
                                  subject = t.findtext('name'),
                                  count = int(t.findtext('count')),
                                  )
                    )
                for t in data.findall('tag')
                ]

    @staticmethod
    def _get_all(seed_tag):
        return (seed_tag, ['name'],
            lambda api, hsh: Tag(api, **hsh).similar)
    
    def _default_params(self, extra_params = None):
        if not self.name:
            raise InvalidParametersError("tag has to be provided.")
        params = {'tag': self.name}
        if extra_params is not None:
            params.update(extra_params)
        return params

    @staticmethod
    def _search_yield_func(api, tag):
        return Tag(
                   api,
                   name = tag.findtext('name'),
                   url = tag.findtext('url'),
                   stats = Stats(
                                 subject = tag.findtext('name'),
                                 count = int(tag.findtext('count')),
                                 )
                    )

    @staticmethod
    def _hash_func(*args, **kwds):
        try:
            return hash(kwds['name'])
        except KeyError:
            raise InvalidParametersError("name has to be provided for hashing")

    def __hash__(self):
        return self.__class__._hash_func(name = self.name)

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

    def __lt__(self, other):
        return self.name < other.name

    def __repr__(self):
        return "<lastfm.Tag: %s>" % self.name

from lastfm.album import Album
from lastfm.api import Api
from lastfm.artist import Artist
from lastfm.error import InvalidParametersError
from lastfm.playlist import Playlist
from lastfm.stats import Stats
from lastfm.track import Track