from typing import Optional
from pypdf import PdfReader
import io
import trafilatura
import requests
from bs4 import BeautifulSoup

USER_AGENT = "Mozilla/5.0 (compatible; PRIRBot/1.0)"

def extract_from_pdf(file_bytes: bytes) -> str:
    reader = PdfReader(io.BytesIO(file_bytes))
    texts = []
    for page in reader.pages:
        try:
            texts.append(page.extract_text() or "")
        except Exception:
            pass
    return "\n".join(texts)

def extract_from_url(url: str) -> str:
    downloaded = trafilatura.fetch_url(url)
    if downloaded:
        txt = trafilatura.extract(downloaded, include_comments=False, include_tables=True)
        if txt:
            return txt
    # fallback: simple soup
    resp = requests.get(url, headers={"User-Agent": USER_AGENT}, timeout=20)
    soup = BeautifulSoup(resp.text, "html.parser")
    return soup.get_text("\n")