from django.conf import settings

from rest_framework import renderers

from core.utils import beautify_artists, clean_quotes


ANNOTATE_FORMAT = (
    'annotate:req_id="{}",'
    'type="{}",'
    'artist="{}",'
    'title="{}",'
    'game="{}",'
    'replay_gain="{}":{}'
)


def build_annotate_string(request_obj):
    '''
    Takes the song request object and returns a Liquidsoap annotate string
    from the attributes.
    '''
    song = request_obj['song']
    if song['song_type'] == 'J':
        artist = settings.RADIO_NAME
        title = 'Jingle'
        game = settings.RADIO_NAME
    else:
        artist = beautify_artists(song['artists'])
        title = clean_quotes(song['title'])
        game = clean_quotes(song['game'])
    return ANNOTATE_FORMAT.format(
        request_obj['id'],
        song['song_type'],
        artist,
        title,
        game,
        song['replaygain'],
        song['path']
    )


class LiquidsoapAnnotateRenderer(renderers.BaseRenderer):
    '''
    Custom renderer to accept and respond with an "annotate" string
    specific to Liquidsoap requests.
    '''
    media_type = 'application/vnd.liquidsoap.annotate'
    format = 'txt'

    def render(self, data, media_type=None, renderer_context=None):
        return data.encode(self.charset)