import os
import discord
import aiohttp
import xml.etree.ElementTree as ET

async def _fetch_latest_subject_sha(rss_url: str) -> tuple[str | None, str | None]:
    """Best-effort: read latest commit subject + short sha from a Gitea RSS feed."""
    try:
        timeout = aiohttp.ClientTimeout(total=8)
        async with aiohttp.ClientSession(timeout=timeout) as sess:
            async with sess.get(rss_url) as resp:
                if resp.status != 200:
                    return None, None
                text = await resp.text()
        root = ET.fromstring(text)
        item = root.find('./channel/item')
        if item is None:
            return None, None
        title = (item.findtext('title') or '').strip()
        link = (item.findtext('link') or '').strip()
        sha = link.rsplit('/commit/', 1)[-1][:7] if '/commit/' in link else None
        return (title or None), sha
    except Exception:
        return None, None

async def post_boot_notice(bot):
    """
    Posts a boot status message to the configured modlog channel.
    Primary source: SHAI_BOOT_* env vars set by the wrapper.
    Fallback: if absent, and SHAI_REPO_RSS is set, show the latest commit subject.
    """
    status = os.getenv("SHAI_BOOT_STATUS", "").strip()    # 'fetched_new' | 'cached_no_update' | 'cache_only_error' | ''
    desc   = os.getenv("SHAI_BOOT_DESC", "").strip()
    old_v  = os.getenv("SHAI_BOOT_OLD", "").strip()
    new_v  = os.getenv("SHAI_BOOT_NEW", "").strip()

    line = None
    if status == "fetched_new":
        line = f"Successfully fetched, cached, and booted new version: v{old_v or '0.0.0.0'} → v{new_v}"
    elif status == "cached_no_update":
        line = f"Successfully booted from cached version: v{new_v}. No new update found"
    elif status == "cache_only_error":
        line = f"Successfully booted from cached version: v{new_v}. Program repository not accessible!"

    # If wrapper didn’t set a status, optionally show latest commit subject from RSS (if provided)
    if not line:
        rss = os.getenv("SHAI_REPO_RSS", "").strip()
        if rss:
            subject, sha = await _fetch_latest_subject_sha(rss)
            if subject and len(subject) > 5:
                line = f"Booted (no BSM env). Latest commit: {subject}" + (f" ({sha})" if sha else "")

    if not line:
        return  # nothing to say

    try:
        ch_id = int(bot.config['DEFAULT'].get('modlog_channel_id', "0") or 0)
    except Exception:
        ch_id = 0
    if not ch_id:
        return

    ch = None
    for g in bot.guilds:
        ch = g.get_channel(ch_id)
        if ch:
            break
    if not ch:
        return

    try:
        msg = line if not desc else f"{line}\n_{desc}_"
        await ch.send(msg, allowed_mentions=discord.AllowedMentions.none())
    except Exception:
        pass