from __future__ import annotations

import re
from typing import Any
from urllib.parse import urlparse

import requests
from bs4 import BeautifulSoup

from config import Settings


def read_webpage(url: str, settings: Settings, max_chars: int = 18000) -> dict[str, Any]:
    parsed = urlparse(url)
    if parsed.scheme not in {"http", "https"}:
        raise ValueError("Only http and https URLs are allowed.")
    response = requests.get(
        url,
        timeout=settings.request_timeout,
        headers={"User-Agent": "Mozilla/5.0 GAIAResearchAgent/1.0"},
        allow_redirects=True,
    )
    response.raise_for_status()
    content_type = response.headers.get("content-type", "")
    if "text/html" not in content_type and "text/plain" not in content_type:
        raise ValueError(f"Unsupported webpage content type: {content_type}")

    soup = BeautifulSoup(response.text, "html.parser")
    for tag in soup(["script", "style", "nav", "footer", "noscript"]):
        tag.decompose()
    title = soup.title.get_text(" ", strip=True) if soup.title else url
    text = re.sub(r"\s+", " ", soup.get_text(" ", strip=True))[:max_chars]
    return {
        "ok": True,
        "source": response.url,
        "content": f"TITLE: {title}\n{text}",
        "metadata": {"status": response.status_code, "content_type": content_type},
    }