from rest_framework import exceptions, negotiation

from . import renderers

MAPPING = {
    "json": (renderers.SubsonicJSONRenderer(), "application/json"),
    "xml": (renderers.SubsonicXMLRenderer(), "text/xml"),
}


class SubsonicContentNegociation(negotiation.DefaultContentNegotiation):
    def select_renderer(self, request, renderers, format_suffix=None):
        data = request.GET or request.POST
        requested_format = data.get("f", "xml")
        try:
            return MAPPING[requested_format]
        except KeyError:
            raise exceptions.NotAcceptable(available_renderers=renderers)