# ============================================================
# File: scraper/services/cover_service.py
# ============================================================

import os
import requests
from logbus.publisher import log
from typing import Optional


class CoverService:

    @staticmethod
    def download_main_cover(cover_url: str, book_id: str) -> Optional[str]:
        """
        Downloads cover image into: static/covers/<book_id>.jpg.
        Returns local path or None.
        """

        if not cover_url:
            log(f"[COVER] No cover URL for book={book_id}")
            return None

        static_dir = os.path.join("static", "covers")
        os.makedirs(static_dir, exist_ok=True)

        dst_path = os.path.join(static_dir, f"{book_id}.jpg")

        try:
            log(f"[COVER] Downloading: {cover_url}")

            resp = requests.get(
                cover_url, timeout=10, headers={"User-Agent": "Mozilla/5.0"}
            )
            resp.raise_for_status()

            with open(dst_path, "wb") as f:
                f.write(resp.content)

            log(f"[COVER] Stored: {dst_path}")
            return dst_path

        except Exception as e:
            log(f"[COVER] FAILED ({cover_url}) → {e}")
            return None