# anime_etl/images/downloader.py
from __future__ import annotations

import os
from typing import Final

import httpx

IMAGE_SERVICE_URL: Final[str] = os.getenv(
    "NYANIMEDB_IMAGE_SERVICE_URL",
    "http://127.0.0.1:8000"
)


async def ensure_image_downloaded(url: str, subdir: str = "posters") -> str:
    """
    Просит image-service скачать картинку по URL и сохранить её у себя.

    Возвращает относительный путь (subdir/ab/cd/<sha1>.ext),
    который можно писать в images.image_path.
    """
    async with httpx.AsyncClient(timeout=20.0) as client:
        resp = await client.post(
            f"{IMAGE_SERVICE_URL}/download-by-url",
            json={"url": url, "subdir": subdir},
        )
        resp.raise_for_status()
        data = resp.json()

    # ожидаем {"path": "..."}
    path = data["path"]
    if not isinstance(path, str):
        raise RuntimeError(f"Invalid response from image service: {data!r}")

    return path