signal-bot/signal_bot/bot.py

# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""The bot object itself: the command wiring and the two loops it owns.

Split out of app.py, which had grown to the 250-line cap with the ASGI
entrypoint, the object graph and the startup sequence all in one file. This
half is "what the bot does"; startup.py is "how it comes up".
"""

from __future__ import annotations

import datetime as dt
import logging
from dataclasses import dataclass
from typing import TYPE_CHECKING

from signal_bot.animals import register_animal_commands
from signal_bot.announce import announce_all
from signal_bot.changelog import load as load_changelog
from signal_bot.counting import format_tally
from signal_bot.decorators import cooldown
from signal_bot.dispatcher import Dispatcher
from signal_bot.http_client import ImageFetcher
from signal_bot.registry import CommandRegistry
from signal_bot.versioning import POPE, __version__

if TYPE_CHECKING:
    import httpx

    from signal_bot.config import Config
    from signal_bot.discovery import GroupDirectory
    from signal_bot.liveness import Liveness
    from signal_bot.store import Store
    from signal_bot.transport_base import Transport

logger = logging.getLogger(__name__)

COOLDOWN_MESSAGE = "BEEP BOOP POCZEKAJ {seconds} SEKUND."


def now_local() -> dt.datetime:
    """Current local time, timezone-aware."""
    return dt.datetime.now().astimezone()


@dataclass
class Bot:
    """The wired-up bot and its two long-running loops."""

    config: Config
    store: Store
    transport: Transport
    directory: GroupDirectory
    dispatcher: Dispatcher
    liveness: Liveness

    async def publish_report(self) -> None:
        """Post each group's own tally into that group, and reset it.

        Each group is isolated on purpose. One group refusing the report --
        the bot removed from it, a transient send failure -- must not cost
        every other group its report, and a tally is cleared only after its
        report has actually gone out, so a failed send loses nothing. A
        group where nobody spoke is skipped entirely.
        """
        for group_id in self.directory.groups:
            rows = [(t.display_name or t.uuid, t.count) for t in self.store.tallies(group_id)]
            if not rows:
                # Logged, not posted. The bot is in every group it was ever
                # added to, so posting "nobody spoke" would mean a nightly
                # ping into every quiet group, forever.
                logger.info("no messages in %s today; not posting a report", group_id)
                continue
            try:
                await self.transport.send_text(format_tally(rows), group_id)
            except Exception:
                logger.exception("daily report failed for group %s", group_id)
                continue
            self.store.reset_tallies(group_id)

    async def announce_release(self) -> None:
        """Tell every watched group about a version it has not seen yet."""
        await announce_all(
            self.transport,
            self.store,
            list(self.directory.groups),
            load_changelog(),
            __version__,
            POPE.name,
        )

    async def listen(self) -> None:
        """Consume frames forever, handing each to the dispatcher."""
        async for frame in self.transport.receive():
            # Every frame counts, including receipts and typing indicators:
            # the question this answers is "can anything still reach us?",
            # not "did anybody address the bot?".
            self.liveness.note_envelope()
            await self.dispatcher.handle(frame)


def build_bot(
    config: Config,
    client: httpx.AsyncClient,
    store: Store,
    transport: Transport,
    directory: GroupDirectory,
    liveness: Liveness,
) -> Bot:
    """Assemble the object graph from its injected dependencies."""
    registry = CommandRegistry()
    register_animal_commands(
        registry,
        ImageFetcher(client),
        decorate=cooldown(config.cooldown_seconds, COOLDOWN_MESSAGE),
        endpoints=config.image_api_urls,
    )
    dispatcher = Dispatcher(
        config=config,
        directory=directory,
        registry=registry,
        store=store,
        transport=transport,
        clock=now_local,
    )
    return Bot(
        config=config,
        store=store,
        transport=transport,
        directory=directory,
        dispatcher=dispatcher,
        liveness=liveness,
    )