from __future__ import annotations

import httpx

from summary_mcp.core.errors import SummaryError
from summary_mcp.models.summary_io import ExtractionInput


MIN_INLINE_CONTENT_LENGTH = 500


def _has_usable_content(value: str | None) -> bool:
    return bool(value and len(value.strip()) >= MIN_INLINE_CONTENT_LENGTH)


def choose_inline_content(extraction_input: ExtractionInput) -> tuple[str | None, str]:
    if extraction_input.raw_html:
        return extraction_input.raw_html, "raw_html"

    if extraction_input.item and _has_usable_content(extraction_input.item.raw_content):
        return extraction_input.item.raw_content, "item.raw_content"

    if extraction_input.item and _has_usable_content(extraction_input.item.raw_summary):
        return extraction_input.item.raw_summary, "item.raw_summary"

    if _has_usable_content(extraction_input.rss_content):
        return extraction_input.rss_content, "rss_content"

    return None, "none"


def fetch_html(url: str) -> str:
    headers = {
        "User-Agent": "summary-mcp/0.1 (+https://modelcontextprotocol.io/)",
    }
    try:
        with httpx.Client(follow_redirects=True, timeout=15.0, headers=headers) as client:
            response = client.get(url)
            response.raise_for_status()
            return response.text
    except httpx.HTTPError as exc:
        raise SummaryError(
            code="CONTENT_FETCH_FAILED",
            message="Failed to fetch article content",
            retryable=True,
            stage="fetch",
            details={"url": url, "reason": str(exc)},
        ) from exc