from __future__ import unicode_literals

import logging
import Queue
import time

TIME_OUT = 10

from spotify import Link, SpotifyError

from mopidy.backends import base
from mopidy.models import Track
from mopidy.backends.base import BaseLibraryProvider
from mopidy.models import Playlist

from . import translator

logger = logging.getLogger('mopidy.backends.spotify')


class SpotifyTrack(Track):
    """Proxy object for unloaded Spotify tracks."""
    def __init__(self, uri):
        super(SpotifyTrack, self).__init__()
        self._spotify_track = Link.from_string(uri).as_track()
        self._unloaded_track = Track(uri=uri, name='[loading...]')
        self._track = None

    @property
    def _proxy(self):
        if self._track:
            return self._track
        elif self._spotify_track.is_loaded():
            self._track = translator.to_mopidy_track(self._spotify_track)
            return self._track
        else:
            return self._unloaded_track

    def __getattribute__(self, name):
        if name.startswith('_'):
            return super(SpotifyTrack, self).__getattribute__(name)
        return self._proxy.__getattribute__(name)

    def __repr__(self):
        return self._proxy.__repr__()

    def __hash__(self):
        return hash(self._proxy.uri)

    def __eq__(self, other):
        if not isinstance(other, Track):
            return False
        return self._proxy.uri == other.uri

    def copy(self, **values):
        return self._proxy.copy(**values)


class SpotifyLibraryProvider(base.BaseLibraryProvider):
    def find_exact(self, **query):
        return self.search(**query)

    def lookup(self, uri):
            link = Link.from_string(uri)
            #uri is an album
            if link.type() == Link.LINK_ALBUM:
                try:
                    spotify_album = Link.from_string(uri).as_album()
                    # TODO Block until metadata_updated callback is called. Before that
                    # the track will be unloaded, unless it's already in the stored
                    # playlists.
                    browser = self.backend.spotify.session.browse_album(spotify_album)

                    #wait 5 seconds
                    start = time.time()
                    while not browser.is_loaded():
                        time.sleep(0.1)
                        if time.time() > (start + TIME_OUT):
                            break
                    album = translator.to_mopidy_album(spotify_album)

                    #for track in browser:
                    # track = translator.to_mopidy_track(track)
                    
                    #from translator
                    tracks=[translator.to_mopidy_track(t) for t in browser
                        if str(Link.from_track(t, 0))]
                    
                    playlist = Playlist(tracks=tracks, uri=uri, name=album.name)
                    return playlist
                
                except SpotifyError as e:
                    logger.debug(u'Failed to lookup album "%s": %s', uri, e)
                    return None
            
            #uri is an album
            if link.type() == Link.LINK_ARTIST:
                try:
                    spotify_artist = Link.from_string(uri).as_artist()
                    # TODO Block until metadata_updated callback is called. Before that
                    # the track will be unloaded, unless it's already in the stored
                    # playlists.
                    browser = self.backend.spotify.session.browse_artist(spotify_artist)
                    #wait 5 seconds
                    start = time.time()
                    while not browser.is_loaded():
                        time.sleep(0.1)
                        if time.time() > (start + TIME_OUT):
                            break
                    artist = translator.to_mopidy_artist(spotify_artist)

                    #for track in browser:
                    # track = translator.to_mopidy_track(track)
                    
                    #from translator
                    tracks=[translator.to_mopidy_track(t) for t in browser
                        if str(Link.from_track(t, 0))]
                    
                    playlist = Playlist(tracks=tracks, uri=uri, name=artist.name)
                    return playlist
                
                except SpotifyError as e:
                    logger.debug(u'Failed to lookup album "%s": %s', uri, e)
                    return None
            
            #uri is a playlist of another user
    # if l.type() == Link.LINK_PLAYLIST:
    # if l.type() == Link.LINK_USER:
            
            #uri is a track
            try:
                spotify_track = Link.from_string(uri).as_track()
                # TODO Block until metadata_updated callback is called. Before that
                # the track will be unloaded, unless it's already in the stored
                # playlists.
                return translator.to_mopidy_track(spotify_track)
            except SpotifyError as e:
                logger.debug(u'Failed to lookup track "%s": %s', uri, e)
                return None

    def refresh(self, uri=None):
        pass  # TODO

    def search(self, **query):
        if not query:
            # Since we can't search for the entire Spotify library, we return
            # all tracks in the playlists when the query is empty.
            tracks = []
            for playlist in self.backend.playlists.playlists:
                tracks += playlist.tracks
            return tracks
        spotify_query = []
        for (field, values) in query.iteritems():
            if field == 'uri':
                tracks = []
                for value in values:
                    track = self.lookup(value)
                    if track:
                        tracks.append(track)
                return tracks
            elif field == 'track':
                field = 'title'
            elif field == 'date':
                field = 'year'
            if not hasattr(values, '__iter__'):
                values = [values]
            for value in values:
                if field == 'any':
                    spotify_query.append(value)
                elif field == 'year':
                    value = int(value.split('-')[0])  # Extract year
                    spotify_query.append('%s:%d' % (field, value))
                else:
                    spotify_query.append('%s:"%s"' % (field, value))
        spotify_query = ' '.join(spotify_query)
        logger.debug('Spotify search query: %s' % spotify_query)
        queue = Queue.Queue()
        self.backend.spotify.search(spotify_query, queue)
        try:
            return queue.get(timeout=3)  # XXX What is an reasonable timeout?
        except Queue.Empty:
            return []