"""Pro-Chat: Betriebsart Unterlagen zuerst (RAG vor Web)."""

from __future__ import annotations

from typing import Optional, Tuple

_active: dict[str, bool] = {}

BTN_OFF = "📁 Unterlagen: AUS"
BTN_ON = "📁 Unterlagen: AN"


def is_document_mode(channel_key: str) -> bool:
    return _active.get(channel_key, False)


def set_document_mode(channel_key: str, on: bool) -> None:
    if on:
        _active[channel_key] = True
    else:
        _active.pop(channel_key, None)


def toggle_document_mode(channel_key: str) -> bool:
    cur = is_document_mode(channel_key)
    set_document_mode(channel_key, not cur)
    return not cur


def keyboard_label(channel_key: str) -> str:
    return BTN_ON if is_document_mode(channel_key) else BTN_OFF


def is_mode_button(text: str) -> bool:
    t = (text or "").strip()
    return t in (BTN_ON, BTN_OFF)


def handle_mode_button(text: str, channel_key: str) -> Optional[bool]:
    """Returns True if turned ON, False if OFF, None if not a mode button."""
    t = (text or "").strip()
    if t == BTN_OFF:
        set_document_mode(channel_key, True)
        return True
    if t == BTN_ON:
        set_document_mode(channel_key, False)
        return False
    return None


def strip_document_prefix(text: str) -> Tuple[str, bool]:
    t = (text or "").strip()
    low = t.lower()
    for p in ("doku:", "rag:", "#doku"):
        if low.startswith(p):
            return t[len(p) :].lstrip(), True
    return t, False