# -*- coding: utf-8 -*-

""" A simple and thin Python library for the Spotify Web API """

from __future__ import print_function

__all__ = [
    'Spotify',
    'SpotifyException'
]

import json
import sys
import time

import requests
import six


class SpotifyException(Exception):
    def __init__(self, http_status, code, msg, headers=None):
        self.http_status = http_status
        self.code = code
        self.msg = msg
        # `headers` is used to support `Retry-After` in the event of a
        # 429 status code.
        if headers is None:
            headers = {}
        self.headers = headers

    def __str__(self):
        return 'http status: {0}, code:{1} - {2}'.format(
            self.http_status, self.code, self.msg)


class Spotify(object):
    """
        Example usage::

            import spotipy

            urn = 'spotify:artist:3jOstUTkEu2JkjvRdBA5Gu'
            sp = spotipy.Spotify()

            sp.trace = True # turn on tracing
            sp.trace_out = True # turn on trace out

            artist = sp.artist(urn)
            print(artist)

            user = sp.user('plamere')
            print(user)
    """

    trace = False  # Enable tracing?
    trace_out = False
    max_get_retries = 10

    def __init__(self, auth=None, requests_session=True,
                 client_credentials_manager=None, proxies=None,
                 requests_timeout=None):
        """
        Creates a Spotify API client.

        :param auth: An authorization token (optional)
        :param requests_session:
            A Requests session object or a truthy value to create one.
            A falsy value disables sessions.
            It should generally be a good idea to keep sessions enabled
            for performance reasons (connection pooling).
        :param client_credentials_manager:
            SpotifyClientCredentials object
        :param proxies:
            Definition of proxies (optional)
        :param requests_timeout:
            Tell Requests to stop waiting for a response after a given
            number of seconds
        """
        self.prefix = 'https://api.spotify.com/v1/'
        self._auth = auth
        self.client_credentials_manager = client_credentials_manager
        self.proxies = proxies
        self.requests_timeout = requests_timeout

        if isinstance(requests_session, requests.Session):
            self._session = requests_session
        else:
            if requests_session:  # Build a new session.
                self._session = requests.Session()
            else:  # Use the Requests API module as a "session".
                from requests import api
                self._session = api

    def _auth_headers(self):
        if self._auth:
            return {'Authorization': 'Bearer {0}'.format(self._auth)}
        elif self.client_credentials_manager:
            token = self.client_credentials_manager.get_access_token()
            return {'Authorization': 'Bearer {0}'.format(token)}
        else:
            return {}

    def _internal_call(self, method, url, payload, params):
        args = dict(params=params)
        args["timeout"] = self.requests_timeout
        if not url.startswith('http'):
            url = self.prefix + url
        headers = self._auth_headers()
        headers['Content-Type'] = 'application/json'

        if payload:
            args["data"] = json.dumps(payload)

        if self.trace_out:
            print(url)
        r = self._session.request(
            method,
            url,
            headers=headers,
            proxies=self.proxies,
            **args)

        if self.trace:  # pragma: no cover
            print()
            print('headers', headers)
            print('http status', r.status_code)
            print(method, r.url)
            if payload:
                print("DATA", json.dumps(payload))

        try:
            r.raise_for_status()
        except BaseException:
            if r.text and len(r.text) > 0 and r.text != 'null':
                msg = '%s:\n %s' % (r.url, r.json()['error']['message'])
                raise SpotifyException(r.status_code,
                                       -1, msg,
                                       headers=r.headers)
            else:
                raise SpotifyException(r.status_code,
                                       -1, '%s:\n %s' % (r.url, 'error'),
                                       headers=r.headers)
        finally:
            if hasattr(r, "connection"):
                r.connection.close()
        if r.text and len(r.text) > 0 and r.text != 'null':
            results = r.json()
            if self.trace:  # pragma: no cover
                print('RESP', results)
                print()
            return results
        else:
            return None

    def _get(self, url, args=None, payload=None, **kwargs):
        if args:
            kwargs.update(args)
        retries = self.max_get_retries
        delay = 1
        while retries > 0:
            try:
                return self._internal_call('GET', url, payload, kwargs)
            except SpotifyException as e:
                retries -= 1
                status = e.http_status
                # 429 means we hit a rate limit, backoff
                if status == 429 or (status >= 500 and status < 600):
                    if retries < 0:
                        raise
                    else:
                        sleep_seconds = int(
                            e.headers.get('Retry-After', delay))
                        print('retrying ...' + str(sleep_seconds) + 'secs')
                        time.sleep(sleep_seconds + 1)
                        delay += 1
                else:
                    raise
            except Exception as e:
                raise
                print('exception', str(e))
                # some other exception. Requests have
                # been know to throw a BadStatusLine exception
                retries -= 1
                if retries >= 0:
                    sleep_seconds = int(e.headers.get('Retry-After', delay))
                    print('retrying ...' + str(delay) + 'secs')
                    time.sleep(sleep_seconds + 1)
                    delay += 1
                else:
                    raise

    def _post(self, url, args=None, payload=None, **kwargs):
        if args:
            kwargs.update(args)
        return self._internal_call('POST', url, payload, kwargs)

    def _delete(self, url, args=None, payload=None, **kwargs):
        if args:
            kwargs.update(args)
        return self._internal_call('DELETE', url, payload, kwargs)

    def _put(self, url, args=None, payload=None, **kwargs):
        if args:
            kwargs.update(args)
        return self._internal_call('PUT', url, payload, kwargs)

    def next(self, result):
        """ returns the next result given a paged result

            Parameters:
                - result - a previously returned paged result
        """
        if result['next']:
            return self._get(result['next'])
        else:
            return None

    def previous(self, result):
        """ returns the previous result given a paged result

            Parameters:
                - result - a previously returned paged result
        """
        if result['previous']:
            return self._get(result['previous'])
        else:
            return None

    def _warn_old(self, msg):
        print('warning:' + msg, file=sys.stderr)

    def _warn(self, msg, *args):
        print('warning:' + msg.format(*args), file=sys.stderr)

    def track(self, track_id):
        """ returns a single track given the track's ID, URI or URL

            Parameters:
                - track_id - a spotify URI, URL or ID
        """

        trid = self._get_id('track', track_id)
        return self._get('tracks/' + trid)

    def tracks(self, tracks, market=None):
        """ returns a list of tracks given a list of track IDs, URIs, or URLs

            Parameters:
                - tracks - a list of spotify URIs, URLs or IDs
                - market - an ISO 3166-1 alpha-2 country code.
        """

        tlist = [self._get_id('track', t) for t in tracks]
        return self._get('tracks/?ids=' + ','.join(tlist), market=market)

    def artist(self, artist_id):
        """ returns a single artist given the artist's ID, URI or URL

            Parameters:
                - artist_id - an artist ID, URI or URL
        """

        trid = self._get_id('artist', artist_id)
        return self._get('artists/' + trid)

    def artists(self, artists):
        """ returns a list of artists given the artist IDs, URIs, or URLs

            Parameters:
                - artists - a list of  artist IDs, URIs or URLs
        """

        tlist = [self._get_id('artist', a) for a in artists]
        return self._get('artists/?ids=' + ','.join(tlist))

    def artist_albums(self, artist_id, album_type=None, country=None, limit=20,
                      offset=0):
        """ Get Spotify catalog information about an artist's albums

            Parameters:
                - artist_id - the artist ID, URI or URL
                - album_type - 'album', 'single', 'appears_on', 'compilation'
                - country - limit the response to one particular country.
                - limit  - the number of albums to return
                - offset - the index of the first album to return
        """

        trid = self._get_id('artist', artist_id)
        return self._get('artists/' + trid + '/albums', album_type=album_type,
                         country=country, limit=limit, offset=offset)

    def artist_top_tracks(self, artist_id, country='US'):
        """ Get Spotify catalog information about an artist's top 10 tracks
            by country.

            Parameters:
                - artist_id - the artist ID, URI or URL
                - country - limit the response to one particular country.
        """

        trid = self._get_id('artist', artist_id)
        return self._get('artists/' + trid + '/top-tracks', country=country)

    def artist_related_artists(self, artist_id):
        """ Get Spotify catalog information about artists similar to an
            identified artist. Similarity is based on analysis of the
            Spotify community's listening history.

            Parameters:
                - artist_id - the artist ID, URI or URL
        """
        trid = self._get_id('artist', artist_id)
        return self._get('artists/' + trid + '/related-artists')

    def album(self, album_id):
        """ returns a single album given the album's ID, URIs or URL

            Parameters:
                - album_id - the album ID, URI or URL
        """

        trid = self._get_id('album', album_id)
        return self._get('albums/' + trid)

    def album_tracks(self, album_id, limit=50, offset=0):
        """ Get Spotify catalog information about an album's tracks

            Parameters:
                - album_id - the album ID, URI or URL
                - limit  - the number of items to return
                - offset - the index of the first item to return
        """

        trid = self._get_id('album', album_id)
        return self._get('albums/' + trid + '/tracks/', limit=limit,
                         offset=offset)

    def albums(self, albums):
        """ returns a list of albums given the album IDs, URIs, or URLs

            Parameters:
                - albums - a list of  album IDs, URIs or URLs
        """

        tlist = [self._get_id('album', a) for a in albums]
        return self._get('albums/?ids=' + ','.join(tlist))

    def search(self, q, limit=10, offset=0, type='track', market=None):
        """ searches for an item

            Parameters:
                - q - the search query
                - limit  - the number of items to return
                - offset - the index of the first item to return
                - type - the type of item to return. One of 'artist', 'album',
                         'track' or 'playlist'
                - market - An ISO 3166-1 alpha-2 country code or the string
                           from_token.
        """
        return self._get('search', q=q, limit=limit,
                         offset=offset, type=type, market=market)

    def user(self, user):
        """ Gets basic profile information about a Spotify User

            Parameters:
                - user - the id of the usr
        """
        return self._get('users/' + user)

    def current_user_playlists(self, limit=50, offset=0):
        """ Get current user playlists without required getting his profile
            Parameters:
                - limit  - the number of items to return
                - offset - the index of the first item to return
        """
        return self._get("me/playlists", limit=limit, offset=offset)

    def user_playlists(self, user, limit=50, offset=0):
        """ Gets playlists of a user

            Parameters:
                - user - the id of the usr
                - limit  - the number of items to return
                - offset - the index of the first item to return
        """
        return self._get("users/%s/playlists" % user, limit=limit,
                         offset=offset)

    def user_playlist(self, user, playlist_id=None, fields=None):
        """ Gets playlist of a user
            Parameters:
                - user - the id of the user
                - playlist_id - the id of the playlist
                - fields - which fields to return
        """
        if playlist_id is None:
            return self._get("users/%s/starred" % (user), fields=fields)
        plid = self._get_id('playlist', playlist_id)
        return self._get("users/%s/playlists/%s" % (user, plid), fields=fields)

    def playlist(self, playlist_id, fields=None, market=None):
        """ Gets playlist by id

            Parameters:
            - playlist - the id of the playlist
            - fields - which fields to return
            - market - An ISO 3166-1 alpha-2 country code or the string
                       from_token.
            """
        plid = self._get_id('playlist', playlist_id)
        return self._get("playlists/%s" % (plid), fields=fields)

    def user_playlist_tracks(self, user, playlist_id=None, fields=None,
                             limit=100, offset=0, market=None):
        """ Get full details of the tracks of a playlist owned by a user.

            Parameters:
                - user - the id of the user
                - playlist_id - the id of the playlist
                - fields - which fields to return
                - limit - the maximum number of tracks to return
                - offset - the index of the first track to return
                - market - an ISO 3166-1 alpha-2 country code.
        """
        plid = self._get_id('playlist', playlist_id)
        return self._get("users/%s/playlists/%s/tracks" % (user, plid),
                         limit=limit, offset=offset, fields=fields,
                         market=market)

    def user_playlist_create(self, user, name, public=True, description=''):
        """ Creates a playlist for a user

            Parameters:
                - user - the id of the user
                - name - the name of the playlist
                - public - is the created playlist public
                - description - the description of the playlist
        """
        data = {'name': name, 'public': public, 'description': description}

        return self._post("users/%s/playlists" % (user,), payload=data)

    def user_playlist_change_details(
            self, user, playlist_id, name=None, public=None,
            collaborative=None, description=None):
        """ Changes a playlist's name and/or public/private state

            Parameters:
                - user - the id of the user
                - playlist_id - the id of the playlist
                - name - optional name of the playlist
                - public - optional is the playlist public
                - collaborative - optional is the playlist collaborative
                - description - optional description of the playlist
        """

        data = {}
        if isinstance(name, six.string_types):
            data['name'] = name
        if isinstance(public, bool):
            data['public'] = public
        if isinstance(collaborative, bool):
            data['collaborative'] = collaborative
        if isinstance(description, six.string_types):
            data['description'] = description
        return self._put("users/%s/playlists/%s" % (user, playlist_id),
                         payload=data)

    def user_playlist_unfollow(self, user, playlist_id):
        """ Unfollows (deletes) a playlist for a user

            Parameters:
                - user - the id of the user
                - name - the name of the playlist
        """
        return self._delete("users/%s/playlists/%s/followers" %
                            (user, playlist_id))

    def user_playlist_add_tracks(self, user, playlist_id, tracks,
                                 position=None):
        """ Adds tracks to a playlist

            Parameters:
                - user - the id of the user
                - playlist_id - the id of the playlist
                - tracks - a list of track URIs, URLs or IDs
                - position - the position to add the tracks
        """
        plid = self._get_id('playlist', playlist_id)
        ftracks = [self._get_uri('track', tid) for tid in tracks]
        return self._post("users/%s/playlists/%s/tracks" % (user, plid),
                          payload=ftracks, position=position)

    def user_playlist_replace_tracks(self, user, playlist_id, tracks):
        """ Replace all tracks in a playlist

            Parameters:
                - user - the id of the user
                - playlist_id - the id of the playlist
                - tracks - the list of track ids to add to the playlist
        """
        plid = self._get_id('playlist', playlist_id)
        ftracks = [self._get_uri('track', tid) for tid in tracks]
        payload = {"uris": ftracks}
        return self._put("users/%s/playlists/%s/tracks" % (user, plid),
                         payload=payload)

    def user_playlist_reorder_tracks(
            self, user, playlist_id, range_start, insert_before,
            range_length=1, snapshot_id=None):
        """ Reorder tracks in a playlist

            Parameters:
                - user - the id of the user
                - playlist_id - the id of the playlist
                - range_start - the position of the first track to be reordered
                - range_length - optional the number of tracks to be reordered
                                 (default: 1)
                - insert_before - the position where the tracks should be
                                  inserted
                - snapshot_id - optional playlist's snapshot ID
        """
        plid = self._get_id('playlist', playlist_id)
        payload = {"range_start": range_start,
                   "range_length": range_length,
                   "insert_before": insert_before}
        if snapshot_id:
            payload["snapshot_id"] = snapshot_id
        return self._put("users/%s/playlists/%s/tracks" % (user, plid),
                         payload=payload)

    def user_playlist_remove_all_occurrences_of_tracks(
            self, user, playlist_id, tracks, snapshot_id=None):
        """ Removes all occurrences of the given tracks from the given playlist

            Parameters:
                - user - the id of the user
                - playlist_id - the id of the playlist
                - tracks - the list of track ids to remove from the playlist
                - snapshot_id - optional id of the playlist snapshot

        """

        plid = self._get_id('playlist', playlist_id)
        ftracks = [self._get_uri('track', tid) for tid in tracks]
        payload = {"tracks": [{"uri": track} for track in ftracks]}
        if snapshot_id:
            payload["snapshot_id"] = snapshot_id
        return self._delete("users/%s/playlists/%s/tracks" % (user, plid),
                            payload=payload)

    def user_playlist_remove_specific_occurrences_of_tracks(
            self, user, playlist_id, tracks, snapshot_id=None):
        """ Removes all occurrences of the given tracks from the given playlist

            Parameters:
                - user - the id of the user
                - playlist_id - the id of the playlist
                - tracks - an array of objects containing Spotify URIs of the
                    tracks to remove with their current positions in the
                    playlist.  For example:
                        [  { "uri":"4iV5W9uYEdYUVa79Axb7Rh", "positions":[2] },
                        { "uri":"1301WleyT98MSxVHPZCA6M", "positions":[7] } ]
                - snapshot_id - optional id of the playlist snapshot
        """

        plid = self._get_id('playlist', playlist_id)
        ftracks = []
        for tr in tracks:
            ftracks.append({
                "uri": self._get_uri("track", tr["uri"]),
                "positions": tr["positions"],
            })
        payload = {"tracks": ftracks}
        if snapshot_id:
            payload["snapshot_id"] = snapshot_id
        return self._delete("users/%s/playlists/%s/tracks" % (user, plid),
                            payload=payload)

    def user_playlist_follow_playlist(self, playlist_owner_id, playlist_id):
        """
        Add the current authenticated user as a follower of a playlist.

        Parameters:
            - playlist_owner_id - the user id of the playlist owner
            - playlist_id - the id of the playlist

        """
        return self._put(
            "users/{}/playlists/{}/followers".format(playlist_owner_id,
                                                     playlist_id))

    def user_playlist_is_following(
            self, playlist_owner_id, playlist_id, user_ids):
        """
        Check to see if the given users are following the given playlist

        Parameters:
            - playlist_owner_id - the user id of the playlist owner
            - playlist_id - the id of the playlist
            - user_ids - the ids of the users that you want to check to see
                if they follow the playlist. Maximum: 5 ids.

        """
        endpoint = "users/{}/playlists/{}/followers/contains?ids={}"
        return self._get(endpoint.format(playlist_owner_id,
                                         playlist_id,
                                         ','.join(user_ids)))

    def me(self):
        """ Get detailed profile information about the current user.
            An alias for the 'current_user' method.
        """
        return self._get('me/')

    def current_user(self):
        """ Get detailed profile information about the current user.
            An alias for the 'me' method.
        """
        return self.me()

    def current_user_playing_track(self):
        ''' Get information about the current users currently playing track.
        '''
        return self._get('me/player/currently-playing')

    def current_user_saved_tracks(self, limit=20, offset=0):
        """ Gets a list of the tracks saved in the current authorized user's
            "Your Music" library

            Parameters:
                - limit - the number of tracks to return
                - offset - the index of the first track to return

        """
        return self._get('me/tracks', limit=limit, offset=offset)

    def current_user_followed_artists(self, limit=20, after=None):
        """ Gets a list of the artists followed by the current authorized user

            Parameters:
                - limit - the number of artists to return
                - after - the last artist ID retrieved from the previous
                          request

        """
        return self._get('me/following', type='artist', limit=limit,
                         after=after)

    def current_user_saved_tracks_delete(self, tracks=None):
        """ Remove one or more tracks from the current user's
            "Your Music" library.

            Parameters:
                - tracks - a list of track URIs, URLs or IDs
        """
        tlist = []
        if tracks is not None:
            tlist = [self._get_id('track', t) for t in tracks]
        return self._delete('me/tracks/?ids=' + ','.join(tlist))

    def current_user_saved_tracks_contains(self, tracks=None):
        """ Check if one or more tracks is already saved in
            the current Spotify user’s “Your Music” library.

            Parameters:
                - tracks - a list of track URIs, URLs or IDs
        """
        tlist = []
        if tracks is not None:
            tlist = [self._get_id('track', t) for t in tracks]
        return self._get('me/tracks/contains?ids=' + ','.join(tlist))

    def current_user_saved_tracks_add(self, tracks=None):
        """ Add one or more tracks to the current user's
            "Your Music" library.

            Parameters:
                - tracks - a list of track URIs, URLs or IDs
        """
        tlist = []
        if tracks is not None:
            tlist = [self._get_id('track', t) for t in tracks]
        return self._put('me/tracks/?ids=' + ','.join(tlist))

    def current_user_top_artists(self, limit=20, offset=0,
                                 time_range='medium_term'):
        """ Get the current user's top artists

            Parameters:
                - limit - the number of entities to return
                - offset - the index of the first entity to return
                - time_range - Over what time frame are the affinities computed
                  Valid-values: short_term, medium_term, long_term
        """
        return self._get('me/top/artists', time_range=time_range, limit=limit,
                         offset=offset)

    def current_user_top_tracks(self, limit=20, offset=0,
                                time_range='medium_term'):
        """ Get the current user's top tracks

            Parameters:
                - limit - the number of entities to return
                - offset - the index of the first entity to return
                - time_range - Over what time frame are the affinities computed
                  Valid-values: short_term, medium_term, long_term
        """
        return self._get('me/top/tracks', time_range=time_range, limit=limit,
                         offset=offset)

    def current_user_recently_played(self, limit=50):
        ''' Get the current user's recently played tracks

            Parameters:
                - limit - the number of entities to return
        '''
        return self._get('me/player/recently-played', limit=limit)

    def current_user_saved_albums(self, limit=20, offset=0):
        """ Gets a list of the albums saved in the current authorized user's
            "Your Music" library

            Parameters:
                - limit - the number of albums to return
                - offset - the index of the first album to return

        """
        return self._get('me/albums', limit=limit, offset=offset)

    def current_user_saved_albums_contains(self, albums=[]):
        """ Check if one or more albums is already saved in
            the current Spotify user’s “Your Music” library.

            Parameters:
                - albums - a list of album URIs, URLs or IDs
        """
        alist = [self._get_id('album', a) for a in albums]
        return self._get('me/albums/contains?ids=' + ','.join(alist))

    def current_user_saved_albums_add(self, albums=[]):
        """ Add one or more albums to the current user's
            "Your Music" library.
            Parameters:
                - albums - a list of album URIs, URLs or IDs
        """
        alist = [self._get_id('album', a) for a in albums]
        return self._put('me/albums?ids=' + ','.join(alist))

    def current_user_saved_albums_delete(self, albums=[]):
        """ Remove one or more albums from the current user's
            "Your Music" library.

            Parameters:
                - albums - a list of album URIs, URLs or IDs
        """
        alist = [self._get_id('album', a) for a in albums]
        return self._delete('me/albums/?ids=' + ','.join(alist))

    def user_follow_artists(self, ids=[]):
        ''' Follow one or more artists
            Parameters:
                - ids - a list of artist IDs
        '''
        return self._put('me/following?type=artist&ids=' + ','.join(ids))

    def user_follow_users(self, ids=[]):
        ''' Follow one or more users
            Parameters:
                - ids - a list of user IDs
        '''
        return self._put('me/following?type=user&ids=' + ','.join(ids))

    def user_unfollow_artists(self, ids=[]):
        ''' Unfollow one or more artists
            Parameters:
                - ids - a list of artist IDs
        '''
        return self._delete('me/following?type=artist&ids=' + ','.join(ids))

    def user_unfollow_users(self, ids=[]):
        ''' Unfollow one or more users
            Parameters:
                - ids - a list of user IDs
        '''
        return self._delete('me/following?type=user&ids=' + ','.join(ids))

    def featured_playlists(self, locale=None, country=None, timestamp=None,
                           limit=20, offset=0):
        """ Get a list of Spotify featured playlists

            Parameters:
                - locale - The desired language, consisting of a lowercase ISO
                  639 language code and an uppercase ISO 3166-1 alpha-2 country
                  code, joined by an underscore.

                - country - An ISO 3166-1 alpha-2 country code.

                - timestamp - A timestamp in ISO 8601 format:
                  yyyy-MM-ddTHH:mm:ss. Use this parameter to specify the user's
                  local time to get results tailored for that specific date and
                  time in the day

                - limit - The maximum number of items to return. Default: 20.
                  Minimum: 1. Maximum: 50

                - offset - The index of the first item to return. Default: 0
                  (the first object). Use with limit to get the next set of
                  items.
        """
        return self._get('browse/featured-playlists', locale=locale,
                         country=country, timestamp=timestamp, limit=limit,
                         offset=offset)

    def new_releases(self, country=None, limit=20, offset=0):
        """ Get a list of new album releases featured in Spotify

            Parameters:
                - country - An ISO 3166-1 alpha-2 country code.

                - limit - The maximum number of items to return. Default: 20.
                  Minimum: 1. Maximum: 50

                - offset - The index of the first item to return. Default: 0
                  (the first object). Use with limit to get the next set of
                  items.
        """
        return self._get('browse/new-releases', country=country, limit=limit,
                         offset=offset)

    def categories(self, country=None, locale=None, limit=20, offset=0):
        """ Get a list of new album releases featured in Spotify

            Parameters:
                - country - An ISO 3166-1 alpha-2 country code.
                - locale - The desired language, consisting of an ISO 639
                  language code and an ISO 3166-1 alpha-2 country code, joined
                  by an underscore.

                - limit - The maximum number of items to return. Default: 20.
                  Minimum: 1. Maximum: 50

                - offset - The index of the first item to return. Default: 0
                  (the first object). Use with limit to get the next set of
                  items.
        """
        return self._get('browse/categories', country=country, locale=locale,
                         limit=limit, offset=offset)

    def category_playlists(self, category_id=None, country=None, limit=20,
                           offset=0):
        """ Get a list of new album releases featured in Spotify

            Parameters:
                - category_id - The Spotify category ID for the category.

                - country - An ISO 3166-1 alpha-2 country code.

                - limit - The maximum number of items to return. Default: 20.
                  Minimum: 1. Maximum: 50

                - offset - The index of the first item to return. Default: 0
                  (the first object). Use with limit to get the next set of
                  items.
        """
        return self._get('browse/categories/' + category_id + '/playlists',
                         country=country, limit=limit, offset=offset)

    def recommendations(self, seed_artists=None, seed_genres=None,
                        seed_tracks=None, limit=20, country=None, **kwargs):
        """ Get a list of recommended tracks for one to five seeds.

            Parameters:
                - seed_artists - a list of artist IDs, URIs or URLs

                - seed_tracks - a list of track IDs, URIs or URLs

                - seed_genres - a list of genre names. Available genres for
                                recommendations can be found by calling
                                recommendation_genre_seeds

                - country - An ISO 3166-1 alpha-2 country code. If provided,
                            all results will be playable in this country.

                - limit - The maximum number of items to return. Default: 20.
                          Minimum: 1. Maximum: 100

                - min/max/target_<attribute> - For the tuneable track
                    attributes listed in the documentation, these values
                    provide filters and targeting on results.
        """
        params = dict(limit=limit)
        if seed_artists:
            params['seed_artists'] = ','.join(
                [self._get_id('artist', a) for a in seed_artists])
        if seed_genres:
            params['seed_genres'] = ','.join(seed_genres)
        if seed_tracks:
            params['seed_tracks'] = ','.join(
                [self._get_id('track', t) for t in seed_tracks])
        if country:
            params['market'] = country

        for attribute in ["acousticness", "danceability", "duration_ms",
                          "energy", "instrumentalness", "key", "liveness",
                          "loudness", "mode", "popularity", "speechiness",
                          "tempo", "time_signature", "valence"]:
            for prefix in ["min_", "max_", "target_"]:
                param = prefix + attribute
                if param in kwargs:
                    params[param] = kwargs[param]
        return self._get('recommendations', **params)

    def recommendation_genre_seeds(self):
        """ Get a list of genres available for the recommendations function.
        """
        return self._get('recommendations/available-genre-seeds')

    def audio_analysis(self, track_id):
        """ Get audio analysis for a track based upon its Spotify ID
            Parameters:
                - track_id - a track URI, URL or ID
        """
        trid = self._get_id('track', track_id)
        return self._get('audio-analysis/' + trid)

    def audio_features(self, tracks=[]):
        """ Get audio features for one or multiple tracks based upon their Spotify IDs
            Parameters:
                - tracks - a list of track URIs, URLs or IDs, maximum: 50 ids
        """
        if isinstance(tracks, str):
            trackid = self._get_id('track', tracks)
            results = self._get('audio-features/?ids=' + trackid)
        else:
            tlist = [self._get_id('track', t) for t in tracks]
            results = self._get('audio-features/?ids=' + ','.join(tlist))
        # the response has changed, look for the new style first, and if
        # its not there, fallback on the old style
        if 'audio_features' in results:
            return results['audio_features']
        else:
            return results

    def devices(self):
        ''' Get a list of user's available devices.
        '''
        return self._get("me/player/devices")

    def current_playback(self, market=None):
        ''' Get information about user's current playback.

            Parameters:
                - market - an ISO 3166-1 alpha-2 country code.
        '''
        return self._get("me/player", market=market)

    def currently_playing(self, market=None):
        ''' Get user's currently playing track.

            Parameters:
                - market - an ISO 3166-1 alpha-2 country code.
        '''
        return self._get("me/player/currently-playing", market=market)

    def transfer_playback(self, device_id, force_play=True):
        ''' Transfer playback to another device.
            Note that the API accepts a list of device ids, but only
            actually supports one.

            Parameters:
                - device_id - transfer playback to this device
                - force_play - true: after transfer, play. false:
                               keep current state.
        '''
        data = {
            'device_ids': [device_id],
            'play': force_play
        }
        return self._put("me/player", payload=data)

    def start_playback(self, device_id=None,
                       context_uri=None, uris=None, offset=None):
        ''' Start or resume user's playback.

            Provide a `context_uri` to start playback or a album,
            artist, or playlist.

            Provide a `uris` list to start playback of one or more
            tracks.

            Provide `offset` as {"position": <int>} or {"uri": "<track uri>"}
            to start playback at a particular offset.

            Parameters:
                - device_id - device target for playback
                - context_uri - spotify context uri to play
                - uris - spotify track uris
                - offset - offset into context by index or track
        '''
        if context_uri is not None and uris is not None:
            self._warn('specify either context uri or uris, not both')
            return
        if uris is not None and not isinstance(uris, list):
            self._warn('uris must be a list')
            return
        data = {}
        if context_uri is not None:
            data['context_uri'] = context_uri
        if uris is not None:
            data['uris'] = uris
        if offset is not None:
            data['offset'] = offset
        return self._put(self._append_device_id(
            "me/player/play", device_id), payload=data)

    def pause_playback(self, device_id=None):
        ''' Pause user's playback.

            Parameters:
                - device_id - device target for playback
        '''
        return self._put(self._append_device_id("me/player/pause", device_id))

    def next_track(self, device_id=None):
        ''' Skip user's playback to next track.

            Parameters:
                - device_id - device target for playback
        '''
        return self._post(self._append_device_id("me/player/next", device_id))

    def previous_track(self, device_id=None):
        ''' Skip user's playback to previous track.

            Parameters:
                - device_id - device target for playback
        '''
        return self._post(self._append_device_id(
            "me/player/previous", device_id))

    def seek_track(self, position_ms, device_id=None):
        ''' Seek to position in current track.

            Parameters:
                - position_ms - position in milliseconds to seek to
                - device_id - device target for playback
        '''
        if not isinstance(position_ms, int):
            self._warn('position_ms must be an integer')
            return
        return self._put(self._append_device_id(
            "me/player/seek?position_ms=%s" % position_ms, device_id))

    def repeat(self, state, device_id=None):
        ''' Set repeat mode for playback.

            Parameters:
                - state - `track`, `context`, or `off`
                - device_id - device target for playback
        '''
        if state not in ['track', 'context', 'off']:
            self._warn('invalid state')
            return
        self._put(
            self._append_device_id(
                "me/player/repeat?state=%s" %
                state, device_id))

    def volume(self, volume_percent, device_id=None):
        ''' Set playback volume.

            Parameters:
                - volume_percent - volume between 0 and 100
                - device_id - device target for playback
        '''
        if not isinstance(volume_percent, int):
            self._warn('volume must be an integer')
            return
        if volume_percent < 0 or volume_percent > 100:
            self._warn('volume must be between 0 and 100, inclusive')
            return
        self._put(
            self._append_device_id(
                "me/player/volume?volume_percent=%s" %
                volume_percent, device_id))

    def shuffle(self, state, device_id=None):
        ''' Toggle playback shuffling.

            Parameters:
                - state - true or false
                - device_id - device target for playback
        '''
        if not isinstance(state, bool):
            self._warn('state must be a boolean')
            return
        state = str(state).lower()
        self._put(
            self._append_device_id(
                "me/player/shuffle?state=%s" %
                state, device_id))

    def _append_device_id(self, path, device_id):
        ''' Append device ID to API path.

            Parameters:
                - device_id - device id to append
        '''
        if device_id:
            if '?' in path:
                path += "&device_id=%s" % device_id
            else:
                path += "?device_id=%s" % device_id
        return path

    def _get_id(self, type, id):
        fields = id.split(':')
        if len(fields) >= 3:
            if type != fields[-2]:
                self._warn('expected id of type %s but found type %s %s' %
                           (type, fields[-2], id))
            return fields[-1]
        fields = id.split('/')
        if len(fields) >= 3:
            itype = fields[-2]
            if type != itype:
                self._warn('expected id of type %s but found type %s %s' %
                           (type, itype, id))
            return fields[-1]
        return id

    def _get_uri(self, type, id):
        return 'spotify:' + type + ":" + self._get_id(type, id)
