"""Reticulum adapter — wraps RNS + LXMF (the standard host-side Reticulum
messaging stack; see docs/ARCHITECTURE.md for why archy-messh talks to a
real RNode-flashed radio via RNS rather than reimplementing Reticulum's
wire format from scratch).

Reticulum has no built-in broadcast-channel concept the way Meshtastic
("channel" PSK) or MeshCore ("public channel index") do — LXMF messaging is
addressed point-to-point between Destinations. To bridge broadcast-style
text, this adapter tracks a roster of peer LXMF delivery destinations
learned from their announces (any Reticulum/Sideband/NomadNet/MeshChat user
who has announced is added), and fans outbound bridge messages out to that
roster individually. This is the simplest correct v0; a dedicated shared
GROUP destination (symmetric-key, closer to a real "channel") is a known
follow-up once Phase 0 proves the roster approach works at all.
"""

import threading
from collections.abc import Callable


class ReticulumAdapter:
    NETWORK = "reticulum"
    ASPECT = "lxmf.delivery"

    def __init__(
        self,
        on_message: Callable[[str, str, str], None],
        storage_path: str,
        display_name: str = "archy-messh-bridge",
    ):
        self._on_message = on_message
        self._storage_path = storage_path
        self._display_name = display_name
        self._router = None
        self._identity = None
        self._destination = None
        self._peers: set[bytes] = set()
        self._lock = threading.Lock()

        # RNS.Transport.register_announce_handler() requires an object with
        # an `aspect_filter` attribute — set here so `self` can be registered
        # directly as the announce handler.
        self.aspect_filter = self.ASPECT

    def connect(self) -> None:
        import RNS
        import LXMF

        RNS.Reticulum()
        self._router = LXMF.LXMRouter(storagepath=self._storage_path)
        self._identity = RNS.Identity()
        self._destination = self._router.register_delivery_identity(
            self._identity, display_name=self._display_name
        )
        self._router.register_delivery_callback(self._handle_delivery)
        RNS.Transport.register_announce_handler(self)
        self._router.announce(self._destination.hash)

    def received_announce(self, destination_hash, announced_identity, app_data) -> None:  # noqa: ANN001
        if self._destination is not None and destination_hash == self._destination.hash:
            return  # ignore our own announce
        with self._lock:
            self._peers.add(destination_hash)

    def _handle_delivery(self, message) -> None:  # noqa: ANN001
        import RNS

        text = message.content_as_string()
        sender = RNS.prettyhexrep(message.source_hash)
        if text:
            self._on_message(self.NETWORK, sender, text)

    def send(self, text: str) -> None:
        import RNS
        import LXMF

        if self._router is None or self._destination is None:
            raise RuntimeError("ReticulumAdapter.send() called before connect()")

        with self._lock:
            peer_hashes = list(self._peers)

        for peer_hash in peer_hashes:
            identity = RNS.Identity.recall(peer_hash)
            if identity is None:
                continue  # no path/identity known yet for this peer
            dest = RNS.Destination(
                identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "lxmf", "delivery"
            )
            lxm = LXMF.LXMessage(
                dest, self._destination, text, desired_method=LXMF.LXMessage.OPPORTUNISTIC
            )
            self._router.handle_outbound(lxm)

    def close(self) -> None:
        pass  # RNS/LXMF manage their own threads; no explicit teardown needed for a v0 prototype