steward_mirror/steward/bot/telegram.py

"""Telegram bot interface for Steward."""

import logging
import re
from dataclasses import dataclass, field
from typing import Any

from telegram import Update
from telegram.constants import ParseMode
from telegram.ext import (
    Application,
    CommandHandler,
    ContextTypes,
    MessageHandler,
    filters,
)

from steward.bot.core import ConversationService
from steward.bot.thread_key import ThreadKey
from steward.config import Settings
from steward.proposals.generator import Proposal, ProposalGenerator

logger = logging.getLogger(__name__)

_CONVERSATION_SYSTEM_APPENDIX = """
Telegram conversation guidance:
- Reply like a thoughtful software engineer in a chat, not like a one-shot FAQ bot.
- Ask a brief follow-up question when the requested outcome, constraints, or preferred
  option is unclear.
- You may send multiple short Telegram messages when that makes the conversation easier to follow.
- To send multiple messages, separate each message with a line containing only [MESSAGE].
- When the user needs to choose from 2-10 concise options, use Telegram's native poll format:
[POLL]
question: The decision to make?
- First option
- Second option
[/POLL]
- Use polls only for discrete choices. Use a normal clarifying question for open-ended input.
""".strip()

_MESSAGE_MARKER_RE = re.compile(r"^\s*\[MESSAGE\]\s*$", re.IGNORECASE)
_POLL_START_RE = re.compile(r"^\s*\[POLL\]\s*$", re.IGNORECASE)
_POLL_END_RE = re.compile(r"^\s*\[/POLL\]\s*$", re.IGNORECASE)
_OPTION_RE = re.compile(r"^\s*(?:[-*•]|\d+[.)]|option\s*:?)\s*(.+?)\s*$", re.IGNORECASE)
_QUESTION_RE = re.compile(r"^\s*question\s*:\s*(.+?)\s*$", re.IGNORECASE)
_MAX_POLL_OPTIONS = 10
_MAX_POLL_QUESTION_LENGTH = 300
_MAX_POLL_OPTION_LENGTH = 100


@dataclass(frozen=True)
class PollRequest:
    """A Telegram poll requested by the assistant response."""

    question: str
    options: list[str]


TelegramResponseAction = str | PollRequest


@dataclass(frozen=True)
class TelegramResponsePlan:
    """Telegram actions derived from a single assistant response."""

    actions: list[TelegramResponseAction] = field(default_factory=list)

    @property
    def messages(self) -> list[str]:
        """Text messages in this response plan."""
        return [action for action in self.actions if isinstance(action, str)]

    @property
    def polls(self) -> list[PollRequest]:
        """Polls in this response plan."""
        return [action for action in self.actions if isinstance(action, PollRequest)]


def _thread_key(update: Update) -> ThreadKey | None:
    """Return the ThreadKey if the message is part of a Telegram thread, else None."""
    msg = update.message
    chat = update.effective_chat
    if msg is None or chat is None:
        return None
    thread_id = msg.message_thread_id
    if thread_id is None:
        return None
    return ThreadKey(platform="telegram", scope=str(chat.id), thread=str(thread_id))


def _is_allowed(user_id: int, settings: Settings) -> bool:
    """Return True if the user is in the allow-list (or no list is configured)."""
    if not settings.telegram_allowed_user_ids:
        return True
    allowed = user_id in settings.telegram_allowed_user_ids
    if not allowed:
        logger.info("Ignoring update from unauthorized user %s", user_id)
    return allowed


def _is_group_enabled(chat_id: int, settings: Settings) -> bool:
    """Return True if the group/channel is in the configured list (or no list is configured)."""
    if not settings.telegram_group_ids:
        return True
    return chat_id in settings.telegram_group_ids


def _is_chat_enabled(chat: Any, settings: Settings) -> bool:
    """Return True if the chat is allowed.

    Private chats are governed only by the user allow-list. Group/channel allow-listing
    applies only to non-private chats.
    """
    if getattr(chat, "type", None) == "private":
        return True

    allowed = _is_group_enabled(chat.id, settings)
    if not allowed:
        logger.info(
            "Ignoring update in unauthorized chat %s (type=%s); configured group IDs: %s",
            chat.id,
            getattr(chat, "type", None),
            settings.telegram_group_ids,
        )
    return allowed


def _telegram_system_prompt(settings: Settings) -> str:
    """Return the conversational Telegram system prompt for normal chat turns."""
    base_prompt = settings.openai_system_prompt.strip()
    if not base_prompt:
        return _CONVERSATION_SYSTEM_APPENDIX
    return f"{base_prompt}\n\n{_CONVERSATION_SYSTEM_APPENDIX}"


def _append_message_action(actions: list[TelegramResponseAction], lines: list[str]) -> None:
    message = "\n".join(lines).strip()
    if message:
        actions.append(message)
    lines.clear()


def _compact_telegram_text(text: str, max_length: int) -> str:
    return re.sub(r"\s+", " ", text).strip()[:max_length]


def _parse_poll(lines: list[str]) -> PollRequest | None:
    question = ""
    options: list[str] = []

    for line in lines:
        stripped = line.strip()
        if not stripped:
            continue

        question_match = _QUESTION_RE.match(stripped)
        if question_match and not question:
            question = question_match.group(1)
            continue

        option_match = _OPTION_RE.match(stripped)
        if option_match:
            options.append(option_match.group(1))
            continue

        if not question:
            question = stripped

    question = _compact_telegram_text(question, _MAX_POLL_QUESTION_LENGTH)
    unique_options: list[str] = []
    for option in options:
        compact_option = _compact_telegram_text(option, _MAX_POLL_OPTION_LENGTH)
        if compact_option and compact_option not in unique_options:
            unique_options.append(compact_option)

    unique_options = unique_options[:_MAX_POLL_OPTIONS]
    if not question or len(unique_options) < 2:
        return None

    return PollRequest(question=question, options=unique_options)


def _parse_telegram_response(reply: str) -> TelegramResponsePlan:
    """Parse assistant response directives into ordered Telegram actions."""
    actions: list[TelegramResponseAction] = []
    message_lines: list[str] = []
    poll_lines: list[str] = []
    in_poll = False

    for line in reply.splitlines():
        if in_poll:
            if _POLL_END_RE.match(line):
                poll = _parse_poll(poll_lines)
                if poll is None:
                    message_lines.extend(["[POLL]", *poll_lines, "[/POLL]"])
                else:
                    actions.append(poll)
                poll_lines.clear()
                in_poll = False
            else:
                poll_lines.append(line)
            continue

        if _MESSAGE_MARKER_RE.match(line):
            _append_message_action(actions, message_lines)
            continue

        if _POLL_START_RE.match(line):
            _append_message_action(actions, message_lines)
            in_poll = True
            continue

        message_lines.append(line)

    if in_poll:
        message_lines.extend(["[POLL]", *poll_lines])
    _append_message_action(actions, message_lines)

    if not actions and reply.strip():
        actions.append(reply.strip())

    return TelegramResponsePlan(actions=actions)


def _format_response_for_history(plan: TelegramResponsePlan) -> str:
    """Render Telegram actions back into natural assistant history text."""
    history_parts: list[str] = []
    for action in plan.actions:
        if isinstance(action, str):
            history_parts.append(action)
        else:
            options = "; ".join(action.options)
            history_parts.append(f"Poll: {action.question} ({options})")
    return "\n\n".join(history_parts)


async def _send_telegram_response(update: Update, plan: TelegramResponsePlan) -> None:
    """Send all Telegram actions for a parsed assistant response."""
    for action in plan.actions:
        if isinstance(action, str):
            await _send_long(update, action)
        else:
            await update.message.reply_poll(  # type: ignore[union-attr]
                question=action.question,
                options=action.options,
                is_anonymous=False,
            )


async def _send_long(update: Update, text: str) -> None:
    """Send text, splitting across messages if it exceeds Telegram's 4096-char limit."""
    limit = 4096
    for i in range(0, len(text), limit):
        await update.message.reply_text(  # type: ignore[union-attr]
            text[i : i + limit],
            parse_mode=ParseMode.MARKDOWN,
        )


async def start_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle /start."""
    settings: Settings = context.bot_data["settings"]
    user = update.effective_user
    if user is None or not _is_allowed(user.id, settings):
        return

    chat = update.effective_chat
    if chat is None or not _is_chat_enabled(chat, settings):
        return

    await update.message.reply_text(  # type: ignore[union-attr]
        "Hello, I'm *Steward* \U0001f916\n\n"
        "I'm your AI-assisted personal operations platform.\n"
        "Talk to me naturally, or use:\n"
        "/help \u2013 show available commands\n"
        "/clear \u2013 reset conversation history\n"
        "/flush \u2013 summarise and archive this thread's memory\n"
        "/recall [query] \u2013 retrieve archived thread summaries\n"
        "/analyse \u2013 run a manual API analysis right now",
        parse_mode=ParseMode.MARKDOWN,
    )


async def help_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle /help."""
    settings: Settings = context.bot_data["settings"]
    user = update.effective_user
    if user is None or not _is_allowed(user.id, settings):
        return

    chat = update.effective_chat
    if chat is None or not _is_chat_enabled(chat, settings):
        return

    await update.message.reply_text(  # type: ignore[union-attr]
        "*Steward commands*\n\n"
        "/start \u2013 greeting\n"
        "/help \u2013 this message\n"
        "/clear \u2013 reset conversation history for this context\n"
        "/flush \u2013 summarise the current thread, store the summary, and compress memory\n"
        "         _(only available inside a message thread)_\n"
        "/recall [query] \u2013 show this thread's summary, list all summaries, or search\n"
        "         by keyword\n"
        "/analyse \u2013 trigger an immediate API analysis and proposal",
        parse_mode=ParseMode.MARKDOWN,
    )


async def clear_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle /clear \u2013 wipe conversation history for this context.

    Inside a message thread: clears the thread's unbounded history.
    Outside a thread: clears the per-user capped history.
    """
    settings: Settings = context.bot_data["settings"]
    service: ConversationService = context.bot_data["service"]
    user = update.effective_user
    if user is None or not _is_allowed(user.id, settings):
        return

    chat = update.effective_chat
    if chat is None or not _is_chat_enabled(chat, settings):
        return

    key = _thread_key(update)
    if key is not None:
        service.clear_history(key)
        await update.message.reply_text(  # type: ignore[union-attr]
            "Thread conversation history cleared."
        )
    else:
        service.clear_history(ThreadKey(platform="telegram", scope=str(user.id)))
        await update.message.reply_text(  # type: ignore[union-attr]
            "Conversation history cleared."
        )


async def flush_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle /flush \u2013 summarise thread memory, persist it, and compress in-memory history."""
    settings: Settings = context.bot_data["settings"]
    service: ConversationService = context.bot_data["service"]
    user = update.effective_user

    if user is None or not _is_allowed(user.id, settings):
        return

    chat = update.effective_chat
    if chat is None or not _is_chat_enabled(chat, settings):
        return

    key = _thread_key(update)
    if key is None:
        await update.message.reply_text(  # type: ignore[union-attr]
            "\u26a0\ufe0f /flush can only be used inside a message thread."
        )
        return

    if not service.has_history(key):
        await update.message.reply_text(  # type: ignore[union-attr]
            "This thread has no conversation history to flush."
        )
        return

    await update.message.reply_text(  # type: ignore[union-attr]
        "\U0001f4be Summarising thread memory\u2026"
    )

    thread_summary = await service.flush_history(key)
    if thread_summary is None:
        await update.message.reply_text(  # type: ignore[union-attr]
            "This thread has no conversation history to flush."
        )
        return

    await update.message.reply_text(  # type: ignore[union-attr]
        f"\u2705 Thread memory flushed and stored "
        f"(thread `{thread_summary.thread_id}`, "
        f"{thread_summary.message_count} messages summarised).",
        parse_mode=ParseMode.MARKDOWN,
    )


async def recall_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle /recall [query] \u2013 retrieve stored thread summaries."""
    settings: Settings = context.bot_data["settings"]
    service: ConversationService = context.bot_data["service"]
    user = update.effective_user

    if user is None or not _is_allowed(user.id, settings):
        return

    chat = update.effective_chat
    if chat is None or not _is_chat_enabled(chat, settings):
        return

    args: list[str] = context.args or []
    if args:
        query = " ".join(args).strip()
        results = service.search_summaries(query)
        if not results:
            await update.message.reply_text(  # type: ignore[union-attr]
                f"No memories found matching *{query}*. "
                "Try a different keyword or use /flush to add more summaries.",
                parse_mode=ParseMode.MARKDOWN,
            )
            return
        lines = [f"\U0001f50d *Knowledge base search: {query}*\n"]
        for s in results:
            date = s.flushed_at[:10]
            first_line = s.summary.split("\n")[0][:80]
            lines.append(f"\u2022 Thread `{s.thread_id}` ({date}): {first_line}\u2026")
            if s.tags:
                lines.append(f"  \U0001f3f7 {', '.join(s.tags)}")
        await _send_long(update, "\n".join(lines))
        return

    key = _thread_key(update)
    if key is not None:
        stored = service.get_summary(key)
        if stored is None:
            await update.message.reply_text(  # type: ignore[union-attr]
                "No stored summary for this thread yet. Use /flush to create one."
            )
        else:
            await _send_long(update, stored.format_for_telegram())
        return

    all_summaries = service.all_summaries()
    if not all_summaries:
        await update.message.reply_text(  # type: ignore[union-attr]
            "No thread summaries stored yet. Use /flush inside a message thread."
        )
        return

    lines = ["\U0001f4da *Stored thread summaries*\n"]
    for s in all_summaries:
        date = s.flushed_at[:10]
        first_line = s.summary.split("\n")[0][:80]
        lines.append(f"\u2022 Thread `{s.thread_id}` ({date}): {first_line}\u2026")
        if s.tags:
            lines.append(f"  \U0001f3f7 {', '.join(s.tags)}")
    await _send_long(update, "\n".join(lines))


async def analyse_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle /analyse \u2013 run the proposal generator on demand."""
    settings: Settings = context.bot_data["settings"]
    user = update.effective_user
    if user is None or not _is_allowed(user.id, settings):
        return

    chat = update.effective_chat
    if chat is None or not _is_chat_enabled(chat, settings):
        return

    await update.message.reply_text("Running analysis, please wait...")  # type: ignore[union-attr]
    generator = ProposalGenerator(settings, context.bot_data["llm"])
    proposal = await generator.run()
    if proposal is None:
        await update.message.reply_text(  # type: ignore[union-attr]
            "Analysis could not be completed. Check that `ANALYSIS_TARGET_URL` is configured."
        )
        return

    await _send_long(update, proposal.format_for_telegram())


async def message_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle plain text messages \u2013 forward to the shared pipeline and reply."""
    settings: Settings = context.bot_data["settings"]
    service: ConversationService = context.bot_data["service"]
    user = update.effective_user
    chat = update.effective_chat
    if user is None or not _is_allowed(user.id, settings):
        return
    if chat is None or not _is_chat_enabled(chat, settings):
        return

    text = update.message.text  # type: ignore[union-attr]
    if not text:
        return

    system_prompt = _telegram_system_prompt(settings)
    key = _thread_key(update)
    if key is None:
        key = ThreadKey(platform="telegram", scope=str(user.id))
        history_cap = 40
    else:
        history_cap = None

    reply = await service.process_message(
        key,
        str(user.id),
        text,
        system_prompt,
        history_cap=history_cap,
        history_formatter=lambda raw: _format_response_for_history(_parse_telegram_response(raw)),
    )
    response_plan = _parse_telegram_response(reply)
    await _send_telegram_response(update, response_plan)


def build_application(
    settings: Settings,
    service: ConversationService,
    generator: ProposalGenerator | None = None,
) -> Application:  # type: ignore[type-arg]
    """Build and return the Telegram Application."""
    app = Application.builder().token(settings.telegram_bot_token).build()
    app.bot_data["settings"] = settings
    app.bot_data["service"] = service
    app.bot_data["llm"] = service.llm
    app.bot_data["generator"] = generator
    logger.info("Configured allowed users: %s", settings.telegram_allowed_user_ids)
    logger.info("Configured group IDs: %s", settings.telegram_group_ids)

    app.add_handler(CommandHandler("start", start_handler))
    app.add_handler(CommandHandler("help", help_handler))
    app.add_handler(CommandHandler("clear", clear_handler))
    app.add_handler(CommandHandler("flush", flush_handler))
    app.add_handler(CommandHandler("recall", recall_handler))
    app.add_handler(CommandHandler("analyse", analyse_handler))
    app.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, message_handler))

    return app


async def send_proposal(app: Application, proposal: Proposal, user_ids: list[int]) -> None:  # type: ignore[type-arg]
    """Send a proposal message to all configured user IDs."""
    text = proposal.format_for_telegram()
    for uid in user_ids:
        try:
            await app.bot.send_message(
                chat_id=uid,
                text=text,
                parse_mode=ParseMode.MARKDOWN,
            )
        except Exception:
            logger.exception("Failed to send proposal to user %d", uid)