from rest_framework import serializers

from .models import Podcast, PodcastCategory, PodcastCollection, PodcastPlaylist, PlaylistItem
from .serializers_admin import AbsoluteFileField, AbsoluteImageField


class DovodiPodcastCategorySerializer(serializers.ModelSerializer):
    slug = serializers.CharField(required=False, allow_blank=True)

    class Meta:
        model = PodcastCategory
        fields = ["id", "title", "slug", "status", "order"]


class DovodiPodcastCollectionSerializer(serializers.ModelSerializer):
    slug = serializers.CharField(required=False, allow_blank=True)
    thumbnail = AbsoluteImageField(required=False, allow_null=True)
    remove_thumbnail = serializers.BooleanField(write_only=True, required=False, default=False)

    class Meta:
        model = PodcastCollection
        fields = [
            "id",
            "title",
            "slug",
            "summary",
            "display_position",
            "status",
            "order",
            "thumbnail",
            "remove_thumbnail",
        ]

    def create(self, validated_data):
        validated_data.pop("remove_thumbnail", False)
        return super().create(validated_data)

    def update(self, instance, validated_data):
        remove_thumbnail = validated_data.pop("remove_thumbnail", False)
        if remove_thumbnail and instance.thumbnail:
            instance.thumbnail.delete(save=False)
            instance.thumbnail = None
        return super().update(instance, validated_data)


class DovodiPodcastItemSerializer(serializers.ModelSerializer):
    slug = serializers.CharField(required=False, allow_blank=True)
    thumbnail = AbsoluteImageField(required=False, allow_null=True)
    audio_file = AbsoluteFileField(required=False, allow_null=True)
    remove_thumbnail = serializers.BooleanField(write_only=True, required=False, default=False)
    remove_audio_file = serializers.BooleanField(write_only=True, required=False, default=False)
    playlist = serializers.IntegerField(required=False, allow_null=True, write_only=True)
    playlist_id = serializers.SerializerMethodField(read_only=True)

    class Meta:
        model = Podcast
        fields = [
            "id",
            "title",
            "slug",
            "thumbnail",
            "description",
            "audio_file",
            "audio_time",
            "status",
            "view_count",
            "download_count",
            "playlist",
            "playlist_id",
            "created_at",
            "updated_at",
            "remove_thumbnail",
            "remove_audio_file",
        ]
        read_only_fields = ["id", "view_count", "download_count", "playlist_id", "created_at", "updated_at"]

    def get_playlist_id(self, obj):
        appearance = obj.playlist_appearances.first()
        return appearance.playlist_id if appearance else None

    def create(self, validated_data):
        playlist_id = validated_data.pop("playlist", None)
        validated_data.pop("remove_thumbnail", False)
        validated_data.pop("remove_audio_file", False)
        instance = super().create(validated_data)
        if playlist_id:
            try:
                playlist = PodcastPlaylist.objects.get(id=playlist_id)
                PlaylistItem.objects.create(playlist=playlist, podcast=instance, priority=playlist.playlist_items.count() + 1)
            except PodcastPlaylist.DoesNotExist:
                pass
        return instance

    def update(self, instance, validated_data):
        remove_thumbnail = validated_data.pop("remove_thumbnail", False)
        remove_audio_file = validated_data.pop("remove_audio_file", False)

        if remove_thumbnail and instance.thumbnail:
            instance.thumbnail.delete(save=False)
            instance.thumbnail = None

        if remove_audio_file and instance.audio_file:
            instance.audio_file.delete(save=False)
            instance.audio_file = None

        playlist_in_payload = "playlist" in self.initial_data
        playlist_id = validated_data.pop("playlist", None)

        instance = super().update(instance, validated_data)

        if playlist_in_payload:
            instance.playlist_appearances.all().delete()
            if playlist_id:
                try:
                    playlist = PodcastPlaylist.objects.get(id=playlist_id)
                    PlaylistItem.objects.create(playlist=playlist, podcast=instance, priority=playlist.playlist_items.count() + 1)
                except PodcastPlaylist.DoesNotExist:
                    pass

        return instance