"""Schemas for gallery resources."""

from ninja import Schema, ModelSchema
from typing import Optional

from apps.blog.api.schemas import AuthorSchema
from apps.gallery.models import Gallery
from core.media import BLUR_VARIANT, PREVIEW_VARIANT, derivative_url


class GallerySchema(ModelSchema):
    """Serialized representation of a gallery image."""
    uploaded_by: AuthorSchema
    file_size_mb: float
    markdown_url: str
    absolute_image_url: Optional[str] = None
    absolute_image_preview_url: Optional[str] = None
    absolute_image_blur_url: Optional[str] = None

    class Config:
        model = Gallery
        model_fields = ['id', 'title', 'description', 'image', 'alt_text',
                        'width', 'height', 'is_public', 'created_at']

    @staticmethod
    def resolve_absolute_image_url(obj, context):
        request = context["request"]
        if obj.image and hasattr(obj.image, "url"):
            return request.build_absolute_uri(obj.image.url)
        return None

    @staticmethod
    def resolve_absolute_image_preview_url(obj, context):
        request = context["request"]
        url = derivative_url(obj.image, PREVIEW_VARIANT)
        return request.build_absolute_uri(url) if url else None

    @staticmethod
    def resolve_absolute_image_blur_url(obj, context):
        request = context["request"]
        url = derivative_url(obj.image, BLUR_VARIANT)
        return request.build_absolute_uri(url) if url else None


class GalleryCreateSchema(Schema):
    """Payload for creating a gallery entry."""
    title: str
    description: Optional[str] = None
    alt_text: Optional[str] = None
    is_public: bool = True