hermes-chatto-plugin/adapter.py

"""
Chatto Platform Adapter for Hermes Agent.

A plugin-based gateway adapter that connects to a Chatto server
(self-hosted team chat) and relays messages to/from the Hermes agent.


The adapter uses the chattolib library for all Chatto API interactions,
including both outbound messaging and realtime WebSocket connections.

"""

from __future__ import annotations

import inspect
import sys
import os
from pathlib import Path

from gateway.platforms.helpers import MessageDeduplicator

# 1. Den absoluten Pfad zum 'vendor'-Ordner in diesem Plugin ermitteln
current_dir = Path(__file__).parent
vendor_dir = current_dir / "vendor"

# 2. Den vendor-Ordner an den Anfang des Suchpfads (sys.path) setzen
if str(vendor_dir) not in sys.path:
    sys.path.insert(0, str(vendor_dir))

import asyncio
import hashlib
import logging
import mimetypes
import os
from collections import OrderedDict
from datetime import datetime, timezone
from typing import Any, Dict, List, Optional, Tuple, cast
from urllib.parse import urlsplit

logger = logging.getLogger(__name__)

from gateway.platforms.base import (
    BasePlatformAdapter,
    SendResult,
    MessageEvent,
    MessageType,
    ProcessingOutcome,
)
from gateway.config import Platform, PlatformConfig

# Chattolib imports (vendored)
# Using vendored chattolib from vendor/chattolib/
# See vendor_chattolib.sh for how to update the vendored copy

try:
    # Try vendored chattolib first
    from .vendor.chattolib.client import (
        ChattoClient,
    )
    from .vendor.chattolib.exceptions import (
        ChattoAuthError,
        ChattoError,
    )
    from .vendor.chattolib.realtime import (
        ChattoRealtimeError,
        ChattoRealtimeCloseError,
        stream_events
    )
    from .vendor.chattolib.realtime_types import (
        MessagePostedPayload
    )
    from .vendor.chattolib.types import (
        PresenceStatus, RoomKind, User
    )

except ImportError as e:
    logger.error("Chatto: failed to import vendored chattolib: %s", e)


from .platform_config import (
        ChattoConfiguration, ChattoConstants,
    )


# --------------------------------------------------------------------------- #
# Adapter
# --------------------------------------------------------------------------- #

def hermes_adapter_factory(config: PlatformConfig):
    """Factory wrapper that constructs ChattoAdapter from a PlatformConfig."""
    return ChattoAdapter(config)


class ChattoAdapter(BasePlatformAdapter):
    """Chatto platform adapter — receives messages via WebSocket realtime,
    sends via ConnectRPC."""

    
    _SPLIT_THRESHOLD = 9900
    splits_long_messages = True
    supports_code_blocks: bool = True
    supports_status_text: bool = True # client.update_custom_status

    def __init__(self, pconfig: PlatformConfig):
        """Signature needs to be compatible with BasePlatformAdapter.__init__ """
        super().__init__(config=pconfig, platform=Platform(ChattoConstants.PLATFORM_NAME))
        # "extra" has been pre-processed by Hermes-Framework to be a dict of extra config values insode PlatformConfig.

        # --- Configuration from our configuration data class with some logic ---
        self.chatto_config: ChattoConfiguration = ChattoConfiguration(pconfig)

        # ------ State -------
        # SDK runtime handle (injected by Hermes); annotate for Pylance
        self.sdk: Any = getattr(self, "sdk", None)

        # --- Runtime state ---
        self._user_id: str = ""
        self._user_display: str = ""
        self._room_names: Dict[str, str] = {}
        self._room_kinds: Dict[str, str] = {}
        self._our_thread_roots: set = set()  # thread root event IDs we created
        self._our_message_ids: set = set()  # message IDs we sent (for thread root detection)
        self._seen: list[str] = []  # room_id -> OrderedDict(event_id -> None)
        self._rt_events_seen: List[str] = []  # Plain RealtimeEvent-id list
        self._resume_cursor: Optional[str] = None
        self._watch_room_ids: List[str] = []
        self._ws_task: Optional[asyncio.Task] = None
        self._ws_ready: Optional[asyncio.Event] = None
        self._ws_active = False
        self._ws_ref = None  # reference to open websocket for dynamic resubscribe

        # Persistent typing indicator loops per room
        self._typing_tasks: Dict[str, asyncio.Task] = {}

        # Member directory cache: user_id -> user info dict
        self._user_cache: Dict[str, User] = {}

        # Chattolib client cache and lock for async access.
        self._chatto_client: Optional[ChattoClient] = None
        self._chatto_client_lock: asyncio.Lock = asyncio.Lock()

        # Dedup — chattolib may redeliver events across reconnects.
        self._dedup = MessageDeduplicator()


    def _list_functions(self):
        for name, member in inspect.getmembers(self, predicate=callable):
            # filtert dunder-Methoden falls gewünscht
            if not name.startswith('__'):
                logger.info("functions: %s", name)
                
    # ------------------------------------------------------------------ #
    # Auth
    # ------------------------------------------------------------------ #

    async def _get_chatto_client(self: ChattoAdapter) -> Optional[ChattoClient]:
        """Get or create a ChattoClient instance."""

        if self._chatto_client is not None:
            return self._chatto_client

        async with self._chatto_client_lock:
            if self._chatto_client is not None:
                return self._chatto_client

            try:
                assert(self.chatto_config.login.value) # now we can assume, _login is available.

                client = await self._open_client(
                    base_url=self.chatto_config.base_url.value,
                    login=self.chatto_config.login.value,
                    password=self.chatto_config.password.value,
                    token=self.chatto_config.token.value,
                )
                self._chatto_client = client
                self._token = client.token
                logger.info("Chatto: logged in as '%s' via chattolib", self.chatto_config.login.value)
                return client
            except ChattoAuthError as e:
                logger.error("Chatto: authentication failed: %s", e)
                return None
            except (ChattoError, ValueError) as e:
                logger.error("Chatto: failed to create client: %s", e)
                return None

    async def _require_client(self) -> ChattoClient:
        """Return a ChattoClient or raise RuntimeError if unavailable.

        Use this helper when the caller expects a client to exist and
        wants a single canonical failure path. Methods that prefer a
        soft-fail can catch RuntimeError and return gracefully.
        """
        client = await self._get_chatto_client()
        if client is None:
            raise RuntimeError("Chatto client unavailable")
        return client

    async def _ensure_token(self) -> bool:
        """Ensure we have a logged-in Chatto client and token."""
        if self.chatto_config.token.value and isinstance(self._chatto_client, ChattoClient):
            return True

        client = await self._get_chatto_client()
        return client is not None

    async def _relogin(self) -> bool:
        """Force re-login (token expired)."""
        self._token = None
        return await self._ensure_token()


    # ------------------------------------------------------------------ #
    # Connection
    # ------------------------------------------------------------------ #
    async def _open_client(
        self,
        *,
        base_url: str,
        login: str,
        password: str,
        token: Optional[str] = None,
    ) -> ChattoClient:
        """Return a connected ``ChattoClient`` using token or login/password."""

        if token:
            return ChattoClient(token=token, base_url=base_url)
        return await ChattoClient.login(login, password, base_url=base_url)
    
    async def connect(self, *, is_reconnect: bool = False) -> bool:
        """Connect to Chatto and start the realtime event stream.

        BasePlatformAdapter override
        """
        logger.info("Chatto: connecting...")

        
        if not await self._ensure_token():
            return False

        try:
            client = await self._require_client()
        except RuntimeError:
            self._set_fatal_error("connect_failed", "Chatto client not available", retryable=True)
            return False

        # Get our first own user info
        try:
            self.me = await client.me()
        except Exception as exc:
            logger.error("Chatto: failed to get user info: %s", exc)
            self._set_fatal_error(
                "chatto_auth_failed",
                f"Chatto auth failed: {exc}",
                retryable=False,
            )
            try:
                assert(self._chatto_client)
                await self._chatto_client.close()
            finally:
                self._chatto_client = None
            return False

        # Broadcast online presence so the bot appears online in the member list
        try:
            await client.update_presence(status=PresenceStatus.ONLINE)
        except Exception:
            logger.debug("Chatto: update_presence(online) failed on connect", exc_info=True)

        self._closing = False
        # Start background realtime WS event stream loop.
        self._ws_ready = asyncio.Event()
        self._ws_task = asyncio.create_task(
            self._chattolib_event_loop(), name="chatto-event-stream",
        )
        self._mark_connected()

        self._list_functions()

        logger.info(
            "Chatto: connected and authentiated to %s using login:'%s' (display_name:'%s' id: '%s')",
            self.chatto_config.base_url.value,
            self.me.login, self.me.display_name, self.me.id
        )        

        return True

    async def disconnect(self) -> None:
        """Stop WebSocket, liveness probe, typing tasks, and clear state.

        BasePlatformAdapter override
        """
        # Broadcast away presence before tearing down
        try:
            client = await self._require_client()
            await client.update_presence(status=PresenceStatus.ONLINE)
        except Exception:
            logger.debug("Chatto: update_presence(PresenceStatus.OFFLINE) failed on disconnect", exc_info=True)


        self._ws_active = False
        self._closing = True

        # Cancel all typing tasks
        for chat_id in list(self._typing_tasks.keys()):
            await self.stop_typing(chat_id)

        if self._ws_task and not self._ws_task.done():
            self._ws_task.cancel()
            try:
                await self._ws_task
            except (asyncio.CancelledError, Exception):
                pass
            self._ws_task = None


        if self._chatto_client:
            try:
                await self._chatto_client.close()
            except Exception:
                logger.exception("Chatto: error closing client")
            finally:
                self._chatto_client = None

        self._token = None
        logger.info("Chatto: disconnected")
        self._mark_disconnected()


    async def _seed_room(self, room_id: str) -> None:
        """Seed high-water mark from the newest events so a restart doesn't replay history."""
        try:
            try:
                client = await self._require_client()
                timeline_page = await client.get_room_events(room_id)
            except RuntimeError:
                logger.debug("Chatto: _seed_room aborted - no client available for %s", room_id)
                return
            
            for ev in timeline_page.events:
                if ev.id:
                    self._mark_seen(ev.id)
            logger.debug("Chatto: seeded room %s with %d events", room_id, len(timeline_page.events))
        except Exception as e:
            logger.debug("Chatto: get room events failed for %s: %s", room_id, e)


    # ------------------------------------------------------------------ #
    # Realtime Event List
    # ------------------------------------------------------------------ #

    def _mark_seen(self, event_id: str) -> None:
        self._seen.append(event_id)
        while len(self._seen) > ChattoConstants.SEEN_CAP:
            self._seen.remove(self._seen[0]) # fastest removal of first item in a list.


    def _is_seen(self, event_id: str) -> bool:
        return event_id in self._seen

    # ------------------------------------------------------------------ #
    # WebSocket Realtime Transport
    # ------------------------------------------------------------------ #

    def _check_auth(self, user: User) -> bool:
        """We roll our own auth-systen on the against the chatto_config'ured allowed_users etc.
           because.. Hermes authz_mixin.py IS NOT SANE.
        """
        if self.chatto_config.allow_all_users:
            return True
        if user.login in self.chatto_config.allowed_users.value:
            return True
        if user.id in self.chatto_config.allowed_users.value:
            return True
        return False

    async def _dispatch_message_posted(self, payload: MessagePostedPayload) -> None:
        try:
            client = await self._require_client()
        except RuntimeError:
            logger.warning("Chatto: chattolib event loop aborted - no client available")
            return
    
        logger.info("Chatto WS: 'message_posted' event_payload:%s", payload)

        message = await payload.fetch_message(client=client)
        if message is None or message.deleted_at:
            return
        message_body = message.body
        if not message_body:
            return

        if message.actor_id in self._user_cache:
            user = self._user_cache.get(message.actor_id)
        else: 
            # get the user and update cache.
            try:
                directory_member = await client.get_user(user_id=message.actor_id)
            except Exception:
                pass
            if directory_member is None:
                return
            user = directory_member.user
            if user is None:
                return
            self._user_cache[user.id] = user

        if user is None:
            return

        if not self._check_auth(user):
            return
        
        # For DMs, always respond. For rooms with require_mention, only respond when mentioned.
        # Strip the mention from the text for the agent
        room_kind = self._room_kinds.get(message.room_id)
        chat_type = "dm" if room_kind == RoomKind.DM else room_kind or RoomKind.UNSPECIFIED # Only "dm" seems to be a reserved keyword from Base adapter class.

        mentioned = False
        if (room_kind is RoomKind.CHANNEL and self.chatto_config.require_mention.value):
            if self.me.login and not mentioned:
                mentioned = f"@{self.me.login}" in message_body
            if self.me.display_name and not mentioned:
                mentioned = f"@{self.me.display_name}" in message_body
            if not mentioned:
                return

        # Thread anchoring — if the incoming message is inside a thread, we
        # keep that thread by default; otherwise leave thread_id unset so
        # replies land at the root.
        thread_id = payload.thread_root_event_id or None
        if not thread_id and chat_type != "dm" and self.chatto_config.auto_thread.value:
            thread_id = message.id
            
        source = self.build_source(
            chat_id=payload.room_id,
            chat_name=self._room_names.get(message.room_id),
            chat_type=chat_type,
            user_id=message.actor_id,
            user_name=user.login, # use login, because display_name is changeable by anyone.
            thread_id=thread_id,
            message_id=payload.message_event_id,
            role_authorized=True,
        )

        msg_type = MessageType.COMMAND if (message_body.lstrip().startswith("/")) else MessageType.TEXT

        my_body = message_body.lstrip() if msg_type == MessageType.COMMAND else message_body

        message_event = MessageEvent(
            text=my_body,
            source=source,
            message_id=message.id,
            message_type=msg_type,
            timestamp=message.created_at or datetime.now(timezone.utc),
            raw_message=message,
            reply_to_message_id=message.id,
            reply_to_text=message_body,
            reply_to_author_id=user.id,
            reply_to_author_name=user.login,
        )
        logger.info("Chatto: Dispatching MessageEvent to Hermes: %s", message_event)

        await self.handle_message(message_event)
        return
    

    async def _chattolib_event_loop(self) -> None:
        """Event loop using chattolib's stream_events.
        
        This replaces the manual WebSocket loop with chattolib's high-level
        stream_events() which provides pre-decoded RealtimeEvent objects.
        """
        try:
            client = await self._require_client()
        except RuntimeError:
            logger.warning("Chatto: chattolib event loop aborted - no client available")
            return
        # Ensure ws_ready is available for synchronization with starter
        assert self._ws_ready is not None
        backoff = ChattoConstants.WS_RECONNECT_INITIAL_BACKOFF
    
        await self._refresh_rooms()
        logger.info("Chatto: starting chattolib event stream with %d rooms", len(self._watch_room_ids))

        while not self._closing:

            backoff = ChattoConstants.WS_RECONNECT_INITIAL_BACKOFF
            logger.info("Outside of event stream")

            try:
                # Start streaming events
                async for event in stream_events(client):

                    if self._is_seen(event.id):
                        continue

                    # Signal that we're connected and ready
                    if not self._ws_ready.is_set():
                        self._ws_active = True
                        self._ws_ready.set()

                    
                    logger.info("EVENT happened: event: %s from %s", event.kind, event.actor_id)

                    if (event_payload := event.get("message_posted")) is not None:

                        # Self-event filter — the actor_id on the envelope is authoritative
                        # (chattolib does NOT filter this itself; see chatto-bridge notes).
                        actor_id = event.actor_id
                        if actor_id and actor_id == self.me.id:
                            return

                        await self._dispatch_message_posted(event_payload)

                    # confirmed:
                    elif event.kind in ("mention_notification", "projection_event", "presence_changed", "notification_dismissed",
                                        "room_marked_as_read", "user_typing", "notification_created"):
                        logger.debug("Chatto: '%s' event received. Not yet implemented or not needed.", event.kind)
                    else:
                        logger.error("Chatto: unknown event kind: '%s'", event.kind)

            except ChattoRealtimeCloseError as e:
                logger.warning("Chatto: realtime closed by server: %s (reconnect=%s)", e.message, e.reconnect)
                if e.reconnect:
                    self._ws_active = False
                    await asyncio.sleep(backoff)
                    backoff = min(backoff * 2, ChattoConstants.WS_RECONNECT_MAX_BACKOFF)
                    continue
                raise
            except ChattoRealtimeError as e:
                logger.warning("Chatto: realtime error: %s (fatal=%s)", e.message, e.fatal)
                if e.fatal:
                    raise
            except (ChattoError, asyncio.CancelledError):
                raise
            except Exception as e:
                self._ws_active = False
                logger.warning("Chatto: event stream error: %s, retrying in %.1fs", e, backoff)
                await asyncio.sleep(backoff)
                backoff = min(backoff * 2, ChattoConstants.WS_RECONNECT_MAX_BACKOFF)

            await asyncio.sleep(backoff)


        # If we didn't find the event, refresh known rooms
        # by delegating to a dedicated helper. This avoids duplicate logic
        # across transient/projection event handlers.
        await self._refresh_rooms()


    async def _refresh_rooms(self) -> None:
        """Refresh room list via ConnectRPC, join and seed any newly discovered rooms."""
        try:
            client = await self._require_client()
        except RuntimeError:
            logger.warning("Chatto WS: _refresh_rooms aborted - no client available")
            return

        try:
            rooms_list = await client.list_rooms()
            new_room_ids: List[str] = []

            for room_with_state in rooms_list:
                if not room_with_state:
                    continue
                
                room_obj = room_with_state.room or None
                if not room_obj:
                    continue
                
                self._room_names[room_obj.id] = room_obj.name
                self._room_kinds[room_obj.id] = room_obj.kind

                if room_with_state.viewer_state.is_member and room_obj.id not in self._watch_room_ids:
                    new_room_ids.append(room_obj.id)

            if not new_room_ids:
                return

            logger.info("Chatto WS: discovered %d new room(s): %s", len(new_room_ids), new_room_ids)

            for rid in new_room_ids:
                if self._room_kinds.get(rid) != RoomKind.DM:
                    await client.join_room(rid) # but list_rooms() would not return any if we were not already joined?!
                self._seen.append(rid) 
                await self._seed_room(rid)
                self._watch_room_ids.append(rid)

            watch_room_names: list[str] = []
            for rid in self._watch_room_ids:
                watch_room_names.append(self._room_names[rid] + " (" + rid + ")")

            logger.info("Chatto WS: Watching %d room(s): %s", len(self._watch_room_ids), ", ".join(watch_room_names))

        except Exception:
            logger.warning("Chatto WS: _refresh_rooms failed", exc_info=True)

        # ------------------------------------------------------------------ #
        # Read state & notification dismissal (best-effort, Chatto-unique)
        # ------------------------------------------------------------------ #
        # Best-effort: mark all watched rooms as read (room_id may be undefined here)
        for _rid in list(self._watch_room_ids):
            try:
                await client.mark_room_as_read(room_id=_rid)
                await client.dismiss_all_notifications()
            except Exception:
                logger.debug("Chatto: mark_room_as_read failed for %s", _rid, exc_info=True)


    # ------------------------------------------------------------------ #
    # Sending (ConnectRPC — unchanged from polling version)
    # ------------------------------------------------------------------ #

    async def send(
        self,
        chat_id: str,
        content: str,
        reply_to: Optional[str] = None,
        metadata: Optional[Dict[str, Any]] = None,
    ) -> SendResult:
        """Send a message to a Chatto room.

        Long messages are split into chunks via ``truncate_message`` and
        each chunk is sent as a separate CreateMessage call.  The first
        chunk's message ID is returned as ``message_id``.

        When ``auto_thread`` is enabled and the incoming message was a
        regular room message (not already in a thread), the first chunk is
        sent as a room message and its ID becomes the thread root. Subsequent
        chunks are sent in that thread. This mirrors Discord's auto_thread
        behavior.

        BasePlatformAdapter override
        """
        if not content:
            return SendResult(success=False, error="Empty message")

        formatted = self.format_message(content) if hasattr(self, "format_message") else content
        chunks = self.truncate_message(formatted, ChattoConstants.MAX_MESSAGE_LENGTH)

        # Thread support — resolve thread_id once
        # DM rooms don't support threads, so skip threading for DMs
        thread_id = (metadata or {}).get("thread_id")
        # Only use reply_to as thread_id if auto_thread is enabled.
        # When auto_thread=false, responses go directly in the room
        # without threading under the incoming message.


        if reply_to and self.chatto_config.auto_thread.value:
            # reply_to might be the incoming message ID. If we already have
            # thread_id from metadata, keep it (it's the thread root).
            # Only use reply_to as thread_id if we don't already have one.
            if not thread_id:
                thread_id = reply_to
        # Check if this is a DM room — DMs don't support threads
        room_kind = self._room_kinds.get(str(chat_id), "")
        is_dm = room_kind == "ROOM_KIND_DM" or room_kind == "dm"
        if is_dm:
            thread_id = None

        # Auto-thread: by default, Chatto creates a thread for replies to room
        # messages (not DMs, not already in a thread). This keeps conversations
        # organized in the room. Can be disabled via extra.auto_thread=false.
        use_auto_thread = self.chatto_config.auto_thread.value and not thread_id and not is_dm

        message_ids: List[str] = []
        last_resp: Optional[dict] = None
        last_error: Optional[str] = None
        retryable = False

        try:
            client = await self._require_client()
        except RuntimeError:
            return SendResult(success=False, error="Chatto client not available", retryable=True)

        for i, chunk in enumerate(chunks):
            try:
                msg_obj = await client.post_message(
                    room_id=str(chat_id),
                    body=chunk,
                    thread_root_event_id=str(thread_id) if thread_id else "",
                )
            except ChattoError as e:
                last_error = str(e)
                retryable = True
                break
            except Exception as e:
                last_error = str(e)
                retryable = True
                break

            if last_error and not message_ids:
                return SendResult(success=False, error=last_error, retryable=retryable)
            
            self._mark_seen(msg_obj.id)
            message_ids.append(msg_obj.id)
            self._our_message_ids.add(msg_obj.id)
            # If we sent a message WITHOUT a thread_id, this message could
            # become a thread root if someone replies to it
            if not thread_id:
                self._our_thread_roots.add(msg_obj.id)
            # Auto-thread: first chunk becomes the thread root,
            # subsequent chunks go in the thread
            if use_auto_thread and i == 0 and not thread_id:
                thread_id = msg_obj.id

        first_id = message_ids[0] if message_ids else ""

        # ------------------------------------------------------------------ #
        # Thread following (best-effort, Chatto-unique)
        # ------------------------------------------------------------------ #
        if thread_id and message_ids:
            try:
                await client.follow_thread(chat_id, thread_id)
            except Exception:
                logger.debug("Chatto: _follow_thread failed for room=%s thread=%s",
                             chat_id, thread_id, exc_info=True)

        return SendResult(success=True, message_id=first_id, raw_response=last_resp)

    # Overridden from BaseAdapter:
    async def send_typing(self, chat_id: str, metadata=None) -> None:
        """Start a persistent typing indicator for a room.

        Sends a typing ping every 10 seconds (Chatto's indicator likely
        lasts ~8-10s).  The background loop runs until ``stop_typing()``
        is called or the task is cancelled.

        BasePlatformAdapter override
        """
        if chat_id in self._typing_tasks:
            return  # already running

        async def _typing_loop() -> None:
            try:
                while True:
                    try:
                        try:
                            client = await self._require_client()
                        except RuntimeError:
                            return
                        await client.update_typing_indicator(room_id=str(chat_id))
                    except asyncio.CancelledError:
                        return
                    except Exception:
                        pass
                    await asyncio.sleep(10)
            except asyncio.CancelledError:
                pass
            finally:
                self._typing_tasks.pop(chat_id, None)

        self._typing_tasks[chat_id] = asyncio.create_task(_typing_loop())

    async def stop_typing(self, chat_id: str) -> None:
        """Stop the persistent typing indicator for a room.

        BasePlatformAdapter override
        """
        task = self._typing_tasks.pop(chat_id, None)
        if task:
            task.cancel()
            try:
                await task
            except (asyncio.CancelledError, Exception):
                pass

    async def get_chat_info(self, chat_id: str) -> Dict[str, Any]:
        """Get information about a chat/room.

        BasePlatformAdapter override
        """
        name = self._room_names.get(chat_id, chat_id)
        kind = self._room_kinds.get(chat_id, "")
        chat_type = "dm" if kind == "ROOM_KIND_DM" else "group"
        return {
            "name": name,
            "type": chat_type,
        }

    # ------------------------------------------------------------------ #
    # Reactions
    # ------------------------------------------------------------------ #

    @staticmethod
    def _emoji_to_shortcode(emoji: str) -> str:
        """Convert a unicode emoji to a Chatto shortcode name.

        If the emoji is already a shortcode (no unicode mapping found),
        return it as-is.
        """
        shortcode = ChattoConstants.EMOJI_TO_SHORTCODE.get(emoji)
        if shortcode:
            return shortcode
        # Already a shortcode like "thumbsup" — return as-is
        return emoji

    async def add_reaction(self, chat_id: str, message_id: str, emoji: str) -> bool:
        """Add a reaction to a message via MessageService/AddReaction."""
        shortcode = self._emoji_to_shortcode(emoji)
        try:
            try:
                client = await self._require_client()
            except RuntimeError:
                return False
            result = await client.add_reaction(
                room_id=chat_id,
                message_event_id=message_id,
                emoji=shortcode,
            )
            return result
        except ChattoError as e:
            logger.debug("Chatto: AddReaction failed: %s", e)
            return False
        except Exception as e:
            logger.debug("Chatto: AddReaction error: %s", e)
            return False

    async def remove_reaction(self, chat_id: str, message_id: str, emoji: str) -> bool:
        """Remove a reaction from a message via MessageService/RemoveReaction."""
        shortcode = self._emoji_to_shortcode(emoji)
        try:
            try:
                client = await self._require_client()
            except RuntimeError:
                return False
            result = await client.remove_reaction(
                room_id=str(chat_id),
                message_event_id=str(message_id),
                emoji=shortcode,
            )
            return result
        except ChattoError as e:
            logger.debug("Chatto: RemoveReaction failed: %s", e)
            return False
        except Exception as e:
            logger.debug("Chatto: RemoveReaction error: %s", e)
            return False


    # ------------------------------------------------------------------ #
    # DM initiation (Chatto-unique)
    # ------------------------------------------------------------------ #

    async def start_dm(self, user_id: str) -> Optional[str]:
        """Start a direct message with a user via RoomService/StartDM.

        Returns the room ID on success, or None on failure.
        """
        if not user_id:
            return None
        try:
            try:
                client = await self._require_client()
            except RuntimeError:
                return None
            room = await client.start_dm(participant_ids=[str(user_id)])
            self._room_names[room.id] = self._room_names.get(room.id, "")
            self._room_kinds[room.id] = "ROOM_KIND_DM"
            return room.id
        except ChattoError as e:
            logger.debug("Chatto: StartDM failed: %s", e)
            return None
        except Exception as e:
            logger.debug("Chatto: StartDM error: %s", e)
            return None



    # ------------------------------------------------------------------ #
    # Room creation (Chatto-unique)
    # ------------------------------------------------------------------ #

    async def create_room(
        self,
        name: str,
        description: str = "",
        group_id: str = "",
        universal: bool = True,
    ) -> Optional[str]:
        """Create an ad-hoc room via RoomService/CreateRoom.

        Returns the room ID on success, or None on failure.
        """
        try:
            try:
                client = await self._require_client()
            except RuntimeError:
                return None
            room = await client.create_room(
                name=name,
                group_id=group_id or "",
                description=description,
                universal=universal,
            )
            rid = str(room.id) if room else ""
            if rid:
                self._room_names[rid] = name
                self._room_kinds[rid] = "ROOM_KIND_GROUP"
                return rid
            logger.debug("Chatto: CreateRoom returned no room id")
            return None
        except ChattoError as e:
            logger.debug("Chatto: CreateRoom failed: %s", e)
            return None
        except Exception as e:
            logger.debug("Chatto: CreateRoom error: %s", e)
            return None




    # ------------------------------------------------------------------ #
    # Processing lifecycle hooks (reactions-based, like Discord)
    # ------------------------------------------------------------------ #

    def _event_room_and_message_id(self, event: MessageEvent) -> Tuple[str, str]:
        """Extract room_id and message_id from a MessageEvent."""
        message_id = event.message_id or ""
        chat_id = event.source.chat_id
        return chat_id, message_id

    async def on_processing_start(self, event: MessageEvent) -> None:
        """Add an 👀 (eyes) reaction to the incoming message.

        BasePlatformAdapter override
        """
        if not self.chatto_config.reactions.value:
            return
        chat_id, message_id = self._event_room_and_message_id(event)
        await self.add_reaction(chat_id, message_id, "👀")

    async def on_processing_complete(
        self, event: MessageEvent, outcome: ProcessingOutcome
    ) -> None:
        """Swap the 👀 reaction for ✅ (success) or ❌ (failure).

        BasePlatformAdapter override
        """
        if not self.chatto_config.reactions.value:
            return
        chat_id, message_id = self._event_room_and_message_id(event)
        if not chat_id or not message_id:
            return
        # Remove the processing eyes reaction
        await self.remove_reaction(chat_id, message_id, "👀")
        # Add the outcome reaction
        if outcome == ProcessingOutcome.SUCCESS:
            await self.add_reaction(chat_id, message_id, "✅")
        elif outcome == ProcessingOutcome.FAILURE:
            await self.add_reaction(chat_id, message_id, "❌")

    # ------------------------------------------------------------------ #
    # Asset upload (chunked)
    # ------------------------------------------------------------------ #

    async def _upload_asset(self, room_id: str, file_path: str) -> Optional[str]:
        """Upload a file via the chunked AssetUploadService.

        Returns the asset ID on success, or None on failure.
        """
        try:
            with open(file_path, "rb") as f:
                file_data = f.read()
        except Exception as e:
            logger.error("Chatto: failed to read file %s — %s", file_path, e)
            return None

        if not file_data:
            logger.error("Chatto: file %s is empty", file_path)
            return None

        file_size = len(file_data)
        file_name = os.path.basename(file_path)
        mime_type = mimetypes.guess_type(file_path)[0] or "application/octet-stream"
        sha256_hash = hashlib.sha256(file_data).hexdigest()

        try:
            try:
                client = await self._require_client()
            except RuntimeError:
                logger.error("Chatto: upload aborted - no client available")
                return None
            # Step 1: Create upload session
            upload = await client.create_upload(
                room_id=room_id,
                filename=file_name,
                size=file_size,
                sha256=sha256_hash,
                content_type=mime_type,
            )
            upload_id = str(getattr(cast(Any, upload), "id", ""))
            if not upload_id:
                logger.error("Chatto: CreateUpload returned no upload ID")
                return None

            # Step 2: Upload chunks
            offset = 0
            while offset < file_size:
                chunk = file_data[offset:offset + ChattoConstants.UPLOAD_CHUNK_SIZE]
                chunk_sha256 = hashlib.sha256(chunk).hexdigest()
                await client.upload_chunk(
                    upload_id=upload_id,
                    offset=offset,
                    content=chunk,
                    chunk_sha256=chunk_sha256,
                )
                offset += len(chunk)

            # Step 3: Complete upload
            upload, asset = await client.complete_upload(upload_id=upload_id)
            if not asset:
                logger.error("Chatto: CompleteUpload returned no asset")
                return None

            asset_id = str(getattr(cast(Any, asset), "id", ""))
            logger.info("Chatto: uploaded %s as asset %s (%d bytes)", file_name, asset_id, file_size)
            return asset_id

        except ChattoError as e:
            logger.error("Chatto: upload failed: %s", e)
            return None
        except Exception as e:
            logger.error("Chatto: upload error: %s", e)
            return None

    async def send_image_file(
        self,
        chat_id: str,
        file_path: str,
        caption: Optional[str] = None,
        reply_to: Optional[str] = None,
        metadata: Optional[Dict[str, Any]] = None,
    ) -> SendResult:
        """Send a local image file via the chunked upload API. Do not change signature.

        BasePlatformAdapter override
        """
        # Validate the path is safe
        safe_path = self.validate_media_delivery_path(file_path)
        if not safe_path:
            logger.warning("Chatto: send_image_file — unsafe path %s", file_path)
            text = "⚠️ Couldn't deliver the image attachment."
            if caption:
                text = f"{caption}\n{text}"
            return await self.send(chat_id, text, reply_to=reply_to, metadata=metadata)

        asset_id = await self._upload_asset(str(chat_id), safe_path)
        if not asset_id:
            # Fallback to a notice
            text = "⚠️ Couldn't deliver the image attachment."
            if caption:
                text = f"{caption}\n{text}"
            return await self.send(chat_id, text, reply_to=reply_to, metadata=metadata)

        thread_id = (metadata or {}).get("thread_id")
        if reply_to:
            thread_id = reply_to

        try:
            try:
                client = await self._require_client()
            except RuntimeError:
                return SendResult(success=False, error="Chatto client not available", retryable=True)
            msg = await client.post_message(
                room_id=str(chat_id),
                body=caption or "",
                attachment_asset_ids=[asset_id],
                thread_root_event_id=str(thread_id) if thread_id else "",
            )
            self._mark_seen(msg.id)
            return SendResult(success=True, message_id=msg.id, raw_response=msg)
        except ChattoError as e:
            return SendResult(success=False, error=str(e), retryable=True)
        except Exception as e:
            return SendResult(success=False, error=str(e), retryable=False)


    async def send_image(
        self,
        chat_id: str,
        image_url: str,
        caption: Optional[str] = None,
        reply_to: Optional[str] = None,
        metadata: Optional[Dict[str, Any]] = None,
    ) -> SendResult:
        """Send an image to a Chatto room.

        Tries to download the image from the URL and upload it as a native
        attachment.  Falls back to sending the URL as a link (Chatto renders
        link previews) if the download fails.

        BasePlatformAdapter override
        """
        # Try downloading and uploading as attachment
        try:
            import tempfile
            import urllib.request as _urllib_request

            # Download to a temp file
            parsed = urlsplit(image_url)
            url_path = parsed.path
            ext = os.path.splitext(url_path)[1] or ".png"
            tmp_fd, tmp_path = tempfile.mkstemp(suffix=ext, prefix="chatto_img_")
            try:
                os.close(tmp_fd)
                req = _urllib_request.Request(image_url, headers={"User-Agent": "Hermes/1.0"})
                try:
                    import ssl

                    ctx = ssl.create_default_context()
                except Exception:
                    ctx = None
                with _urllib_request.urlopen(req, timeout=ChattoConstants.HTTP_TIMEOUT, context=ctx) as resp:
                    with open(tmp_path, "wb") as f:
                        f.write(resp.read())

                # Upload as attachment
                result = await self.send_image_file(
                    chat_id, tmp_path, caption=caption,
                    reply_to=reply_to, metadata=metadata,
                )
                if result.success:
                    return result
            finally:
                try:
                    os.unlink(tmp_path)
                except OSError:
                    pass
        except Exception as e:
            logger.debug("Chatto: send_image download/upload failed, falling back to link: %s", e)

        # Fallback: send as link (Chatto renders link previews)
        text = image_url
        if caption:
            text = f"{caption}\n{image_url}"
        return await self.send(chat_id, text, reply_to=reply_to, metadata=metadata)



# ---------------------------------------------------------------------------
# Cron / out-of-process delivery
# ---------------------------------------------------------------------------

async def hermes_standalone_sender_fn(
    pconfig,
    chat_id,
    message,
    *,
    thread_id=None,
    media_files=None,
    force_document=False,
) -> SendResult:
    """Deliver a message to Chatto without a running gateway adapter. Do not modify signature.
    Used by cron / scheduled routines that run out-of-process. Creates a
    short-lived chattolib client, posts, and closes.
    """

    chatto_config: ChattoConfiguration = ChattoConfiguration(pconfig=pconfig)
    
    # Create a temporary client for standalone sending
    client: ChattoClient

    if not chatto_config.base_url.value or (not (chatto_config.login.value or not chatto_config.password.value) or not chatto_config.token.value):
        return SendResult(success=False, error="Chatto: base URL or credentials missing")
    
    try: 
        if chatto_config.token.value:
            client = ChattoClient(base_url=chatto_config.base_url.value, token=chatto_config.token.value)
        else:
            if chatto_config.login.value and chatto_config.password.value:
                client = await ChattoClient.login(
                    base_url=chatto_config.base_url.value, login=chatto_config.login.value, password=chatto_config.password.value,
                )
    except (Exception, ValueError) as exc:
        return SendResult(success=False, error=f"Chatto login failed: {exc}")
    finally:
        logger.debug("Chatto standalone client: {client}")

    try:
        kwargs: Dict[str, Any] = {}
        if chatto_config.auto_thread.value and thread_id:
            kwargs["in_reply_to"] = thread_id
        if media_files and media_files.get("attachment_asset_ids"):
            kwargs["attachment_asset_ids"] = list(media_files["attachment_asset_ids"])
        try:
            posted = await client.post_message(chat_id, message, **kwargs)
        except Exception as exc:
            return SendResult(success=False, error=str(exc))
        return SendResult(success=True, message_id=getattr(posted, "id", "") or None)
    finally:
        try:
            await client.close()
        except Exception as exc:
            logger.error("Chatto standalone: error closing short-lived client. Perhaps already closed. {exc}")


def hermes_validate_config(config: PlatformConfig) -> bool:
    """"
    Function name should be the same as register argument name with "hermes_" prefix, so we
    know that it is needed for plugin register(). Do not change signature.
    - config
    Check whether Chatto Plugin is configured. Compare to hermes_is_connected()."""

    chatto_config = ChattoConfiguration(pconfig=config)

    if len(chatto_config.allowed_users.value) > 0 and chatto_config.allow_all_users.value:
        logger.info("Chatto: Conflicting configuration. Either use 'allowed_users' or 'allow_all_users' but not both.")
        return False

    if chatto_config.base_url.value:
        if (chatto_config.token.value is not None) or (chatto_config.login.value and chatto_config.password.value):
            return True
        else:
            logger.error("Chatto: Minimally, either token or login/password must be set.")
    else:
        logger.error("Chatto: base_url must be set.")

    return False


def hermes_check_fn() -> bool:
    """Check if Chatto is configured and dependencies are available.
    Add real logic?! Or just .. there are no dependencies.. always return true. Really. Docs suck."""
    try:
        from .vendor.chattolib.client import ChattoClient
        return True
    except ImportError:
        return False
    return True


# ---------------------------------------------------------------------------
# is_connected probe
# ---------------------------------------------------------------------------

def hermes_is_connected(config: PlatformConfig) -> bool:
    """Check whether Chatto Plugin is connected. But where to? To the Hermes Agent? To Chatto Server?
    The Hermes Agent plugin docs suck and it seems there are many functions to do the same."""
    return bool(hermes_validate_config(config) and config.enabled)



# ---------------------------------------------------------------------------
# YAML → env config bridge
# ---------------------------------------------------------------------------

@DeprecationWarning
def hermes_apply_yaml_config_fn(yaml_dict: dict, platform_dict: dict) -> Optional[dict]:
    """Translate config.yaml chatto.extra keys into CHATTO_* env vars.
    I don't actually get why Hermes wants us to modify OS environment variables.
    Bad behavior in my book.
    
    Also .. I don't think we need this"""

    if not isinstance(platform_dict, dict):
        platform_dict = {}
    extra = platform_dict.get("extra", {}) or {}
    if not isinstance(extra, dict):
        extra = {}

    for yaml_key, env_key in ChattoConstants.EXTRA_ENV_MAPPING.items():
        val = extra.get(yaml_key)
        if val is not None and not os.getenv(env_key):
            if isinstance(val, bool):
                env_val = str(val).lower()
            elif isinstance(val, list):
                env_val = ",".join(str(v) for v in val)
            else:
                env_val = str(val)
            os.environ[env_key] = env_val

    channels = extra.get(ChattoConfiguration.channels.field_name)
    if isinstance(channels, list) and not os.getenv(ChattoConfiguration.channels.env_name):
        os.environ[ChattoConfiguration.channels.env_name] = ",".join(str(c) for c in channels)

    allowed = extra.get(ChattoConfiguration.allowed_users.field_name)
    if isinstance(allowed, list) and not os.getenv(ChattoConfiguration.allowed_users.env_name):
        os.environ[ChattoConfiguration.allowed_users.env_name] = ",".join(str(u) for u in allowed)

    if ChattoConfiguration.allow_all_users.field_name in extra and not os.getenv(ChattoConfiguration.allow_all_users.env_name):
        os.environ[ChattoConfiguration.allow_all_users.env_name] = str(extra[ChattoConfiguration.allow_all_users.field_name]).lower()

    return None


def hermes_setup_fn() -> None:
    """Interactive setup wizard for Chatto. Is called by and only works in Hermes CLI context.
    Function name should be the same as register argument name with "hermes_" prefix, so we
    know that it is needed for plugin register().
    """
    from hermes_cli.setup import (
        prompt,
        prompt_yes_no,
        save_env_value,
        get_env_value,
        print_header,
        print_info,
        print_warning,
        print_success,
    )

    url = prompt(
        "Chatto server URL (e.g. https://chat.example.com) or leave blank for default ChattoHQ on chat.chatto.run:")
    if url:
        save_env_value(ChattoConfiguration.base_url.env_name, url)

    login = prompt("Chatto login (username):")
    if login:
        save_env_value(ChattoConfiguration.login.env_name, login)

    password = prompt("Chatto password:", password=True)
    if password:
        save_env_value(ChattoConfiguration.password.env_name, password)

    channels = prompt("Room IDs to watch (comma-separated, or empty for all):")
    if channels:
        save_env_value(ChattoConfiguration.channels.env_name, channels)

    home = prompt("Home room ID for notifications (or empty):")
    if home:
        save_env_value(ChattoConfiguration.home_channel.env_name, home)

    allow_all = prompt_yes_no("Allow all users to talk? (true/false):")
    if allow_all:
        save_env_value(ChattoConfiguration.allow_all_users.env_name, str(allow_all))
    print_success("\n✓ Chatto configured. Restart the gateway to activate.")


def hermes_env_enablement_fn() -> Optional[dict]:
    """Seed PlatformConfig.extra from env vars.

    Returns a dict compatible with the PlatformConfig merge hook (or None
    when no env-provided values are present).

    Called by the platform registry during load_gateway_config().
    Return None when the platform isn't minimally configured — the
    caller then skips auto-enabling. Return a dict to seed extras.

    The special 'home_channel' key is extracted and becomes a proper
    HomeChannel dataclass on the PlatformConfig; every other key is
    merged into PlatformConfig.extra.

    Function name should be the same as register argument name with "hermes_" prefix, so we
    know that it is needed for plugin register().
    """

    def _add_env_to_seed(seed: dict, our_key: str) -> dict:
        env_value = os.getenv(our_key.upper())
        if env_value:
            seed[our_key.lower()] = env_value
        return seed
    
    seed = {}
    seed["base_url"] = (os.getenv(ChattoConfiguration.base_url.env_name) or ChattoClient.DEFAULT_BASE_URL).strip()

    seed = _add_env_to_seed(seed, ChattoConfiguration.token.env_name)
    seed = _add_env_to_seed(seed, ChattoConfiguration.login.env_name)
    seed = _add_env_to_seed(seed, ChattoConfiguration.password.env_name)

    seed = _add_env_to_seed(seed, ChattoConfiguration.channels.env_name)
    seed = _add_env_to_seed(seed, ChattoConfiguration.home_channel.env_name)
    seed = _add_env_to_seed(seed, ChattoConfiguration.require_mention.env_name)
    seed = _add_env_to_seed(seed, ChattoConfiguration.free_response_channels_list.env_name)
    seed = _add_env_to_seed(seed, ChattoConfiguration.auto_thread.env_name)

    logger.debug("seed: " + str(seed))

    return seed


# ---------------------------------------------------------------------------
# Plugin registration entry point
# ---------------------------------------------------------------------------

def register(ctx) -> None:
    """Plugin entry point — called by the Hermes plugin system."""
    logger.info("Registering Chatto platform plugin on Hermes Agent")

    logger.info("ChattoConfiguration.allowed_users.env_name: %s", ChattoConfiguration.allowed_users.env_name)

    ctx.register_platform(
        name=ChattoConstants.PLATFORM_NAME, # this will be the config.yaml key.
        label=ChattoConstants.PLATFORM_LABEL,
        adapter_factory=hermes_adapter_factory,
        check_fn=hermes_check_fn,
        validate_config=hermes_validate_config,
        is_connected=hermes_is_connected,
        install_hint=ChattoConstants.INSTALL_HINT,
        env_enablement_fn=hermes_env_enablement_fn,
        setup_fn=hermes_setup_fn,
        apply_yaml_config_fn=hermes_apply_yaml_config_fn,
        cron_deliver_env_var=ChattoConfiguration.home_channel.env_name,
        standalone_sender_fn=hermes_standalone_sender_fn,
        allowed_users_env=ChattoConfiguration.allowed_users.env_name,
        allow_all_env=ChattoConfiguration.allow_all_users.env_name,
        max_message_length=ChattoConstants.MAX_MESSAGE_LENGTH,
        emoji="💬",
        allow_update_command=True,
        pii_safe=False,
        platform_hint=(
            "You are chatting in Chatto (a self-hosted or cloud-hosted team or community chat server). "
            "Markdown is supported. Users _may_ address you by @-mentioning your name. If configured, " \
            "you also react without a @-mention. Direct messages reach you without a mention."
            "Keep responses conversational."
        ),
    )