import re
from typing import Tuple, Optional, Any
from telegram.constants import ChatType
from telegram.error import Forbidden, BadRequest

async def verify_and_fetch_chat(ctx, raw: str | int):
    """Return (chat, member, can_post) for the bot in that chat."""
    bot = ctx.bot

    # Normalize t.me links to @username
    if isinstance(raw, str) and "t.me/" in raw:
        raw = raw.strip().split("t.me/")[-1]
        raw = raw.strip().lstrip("/")
        if raw and not raw.startswith("@"):
            raw = "@" + raw

    chat = await bot.get_chat(raw)
    try:
        member = await bot.get_chat_member(chat.id, bot.id)
    except Forbidden:
        return chat, None, False
    except BadRequest as e:
        raise e

    can_post = False
    if chat.type == ChatType.CHANNEL:
        status = getattr(member, "status", "")
        if status in ("administrator", "creator"):
            flag = getattr(member, "can_post_messages", None)
            can_post = True if (flag is None or flag is True) else False
    elif chat.type in (ChatType.SUPERGROUP, ChatType.GROUP):
        status = getattr(member, "status", "")
        can_post = status in ("member", "administrator", "creator")
    return chat, member, can_post

def parse_chat_id(text: str) -> int | None:
    m = re.search(r'(-?\d{5,})', text or "")
    if m:
        try:
            return int(m.group(1))
        except ValueError:
            return None
    return None