from rest_framework import serializers
from .models import Song, FavoriteSong, PlayList, Podkast


class SongSerializer(serializers.ModelSerializer):

    class Meta:
        model = Song    
        fields = ('id', 'unique_id', 'azura_id', 'title', 'artist', 'album', 'genre', 'art')


class PlayListSerializer(serializers.ModelSerializer):
    
    def validate(self, attrs):
        if PlayList.objects.filter(
                name=attrs.get('name'),
                user=attrs.get('user')
        ).exists():
            raise serializers.ValidationError(
                {
                    'playlist': ['Данный плейлист уже существует']
                })
        return super().validate(attrs)
    
    class Meta:
        model = PlayList
        fields = ('id', 'name', 'song', 'user', 'playlist_art')
    
    def to_representation(self, instance):
        rep = super().to_representation(instance)
        rep["song"] = SongSerializer(
            instance.song.all(), many=True).data
        return rep 
    

class FavoriteSongSerializer(serializers.ModelSerializer):
    song = SongSerializer(many=True)
    class Meta:
        model = FavoriteSong    
        fields = '__all__'
        

class PodkastSerializer(serializers.ModelSerializer):
    class Meta:
        model = Podkast
        fields = '__all__'