# ============================================================
# File: scraper/sites/__init__.py
# Purpose:
#   Site autodetection based on URL.
# ============================================================

from scraper.sites.piaotian import PiaotianScraper


def get_scraper_for_url(url: str):
    """
    Return the correct scraper instance for a given URL.
    Later: add more site implementations.
    """
    if "ptwxz" in url or "piaotian" in url:
        return PiaotianScraper()

    raise ValueError(f"No scraper available for URL: {url}")


# ============================================================
# Backwards-compatibility export for legacy BookScraper
# ============================================================
# Old code expects:
#   from scraper.sites import BookSite
# We map that to our new PiaotianScraper implementation.

BookSite = PiaotianScraper