"""Plugin: SearXNG web search."""

from __future__ import annotations

import json
import urllib.parse
import urllib.request

from derp.http import urlopen as _urlopen
from derp.plugin import command

# -- Constants ---------------------------------------------------------------

_SEARX_URL = "https://searx.mymx.me/search"
_FETCH_TIMEOUT = 10
_MAX_RESULTS = 3
_MAX_TITLE_LEN = 80
_MAX_QUERY_LEN = 200


# -- Pure helpers ------------------------------------------------------------

def _truncate(text: str, max_len: int = _MAX_TITLE_LEN) -> str:
    """Truncate text with ellipsis if needed."""
    if len(text) <= max_len:
        return text
    return text[: max_len - 3].rstrip() + "..."


# -- SearXNG search (blocking) ----------------------------------------------

def _search(query: str) -> list[dict]:
    """Search SearXNG. Blocking.

    Returns list of dicts with keys: title, url, snippet.
    Raises on HTTP or parse errors.
    """
    params = urllib.parse.urlencode({"q": query, "format": "json"})
    url = f"{_SEARX_URL}?{params}"

    req = urllib.request.Request(url, method="GET")
    resp = _urlopen(req, timeout=_FETCH_TIMEOUT, proxy=False)
    raw = resp.read()
    resp.close()

    data = json.loads(raw)
    results: list[dict] = []
    for item in data.get("results", []):
        results.append({
            "title": item.get("title", ""),
            "url": item.get("url", ""),
            "snippet": item.get("content", item.get("snippet", "")),
        })
    return results


# -- Command handler ---------------------------------------------------------

@command("searx", help="Search: !searx <query>")
async def cmd_searx(bot, message):
    """Search SearXNG and show top results.

    Usage: !searx <query...>
    """
    if not message.is_channel:
        await bot.reply(message, "Use this command in a channel")
        return

    parts = message.text.split(None, 1)
    if len(parts) < 2 or not parts[1].strip():
        await bot.reply(message, "Usage: !searx <query>")
        return

    query = parts[1].strip()
    if len(query) > _MAX_QUERY_LEN:
        await bot.reply(message, f"Query too long (max {_MAX_QUERY_LEN} chars)")
        return

    import asyncio
    loop = asyncio.get_running_loop()

    try:
        results = await loop.run_in_executor(None, _search, query)
    except Exception as exc:
        await bot.reply(message, f"Search failed: {exc}")
        return

    if not results:
        await bot.reply(message, f"No results for: {query}")
        return

    for item in results[:_MAX_RESULTS]:
        title = _truncate(item["title"]) if item["title"] else "(no title)"
        url = item["url"]
        await bot.reply(message, f"{title} -- {url}")