# -*- coding: utf-8 -*-
"""Web pages — via Jina Reader API (free, no config needed).

Backend: Jina Reader (https://r.jina.ai)
Swap to: Firecrawl, Trafilatura, or any other reader API
"""

import requests
from .base import Channel, ReadResult


class WebChannel(Channel):
    name = "web"
    description = "网页（任意 URL）"
    backends = ["Jina Reader API"]
    tier = 0

    JINA_URL = "https://r.jina.ai/"

    def can_handle(self, url: str) -> bool:
        # Fallback — handles any URL not matched by other channels
        return True

    async def read(self, url: str, config=None) -> ReadResult:
        resp = requests.get(
            f"{self.JINA_URL}{url}",
            headers={"Accept": "text/markdown"},
            timeout=15,
        )
        resp.raise_for_status()
        text = resp.text

        # Extract title from first markdown heading
        title = url
        for line in text.split("\n"):
            line = line.strip()
            if line.startswith("# "):
                title = line[2:].strip()
                break
            if line.startswith("Title:"):
                title = line[6:].strip()
                break

        return ReadResult(
            title=title,
            content=text,
            url=url,
            platform="web",
        )