from django.urls import reverse
from rest_framework import serializers

__all__ = [
    "RequestSerializer",
    "StreamerSerializer",
    "SourceSerializer",
    "PlaylistSerializer",
    "QueueSourceSerializer",
]
# TODO: use models' serializers


class BaseSerializer(serializers.Serializer):
    url_ = serializers.SerializerMethodField("get_url")
    url_name = None

    def get_url(self, obj, **kwargs):
        if not obj or not self.url_name:
            return
        kwargs.setdefault("pk", getattr(obj, "id", None))
        return reverse(self.url_name, kwargs=kwargs)


class MetadataSerializer(BaseSerializer):
    rid = serializers.IntegerField()
    air_time = serializers.DateTimeField()
    uri = serializers.CharField()


class RequestSerializer(MetadataSerializer):
    title = serializers.CharField(required=False)
    artist = serializers.CharField(required=False)


class SourceSerializer(MetadataSerializer):
    id = serializers.CharField()
    uri = serializers.CharField()
    rid = serializers.IntegerField()
    air_time = serializers.DateTimeField()
    status = serializers.CharField()
    status_verbose = serializers.CharField()
    remaining = serializers.FloatField()

    def get_url(self, obj, **kwargs):
        kwargs["station_pk"] = obj.station.pk
        return super().get_url(obj, **kwargs)

    def get_status_verbose(self, obj, **kwargs):
        return obj.status_verbose


class PlaylistSerializer(SourceSerializer):
    program = serializers.CharField(source="program.id")

    url_name = "streamer:api:streamer-playlist-detail"


class QueueSourceSerializer(SourceSerializer):
    queue = serializers.ListField(child=RequestSerializer(), source="requests")

    url_name = "streamer:api:streamer-queue-detail"


class StreamerSerializer(BaseSerializer):
    id = serializers.IntegerField(source="station.pk")
    name = serializers.CharField(source="station.name")
    source = serializers.CharField(source="source.id", required=False)
    playlists = serializers.ListField(child=PlaylistSerializer())
    queues = serializers.ListField(child=QueueSourceSerializer())

    url_name = "streamer:api:streamer-detail"

    def get_url(self, obj, **kwargs):
        kwargs["pk"] = obj.station.pk
        return super().get_url(obj, **kwargs)