MeshTerm/tests/test_courier.py

"""Courier tests: the outbox store, delivery eligibility, and the attempt flow.

The service is driven synchronously (eligibility) and through stubbed chat sends
(attempts), so no timers or hardware are involved.
"""

from __future__ import annotations

import logging
import re
from datetime import timedelta
from pathlib import Path
from types import SimpleNamespace

import pytest
from rich.cells import cell_len
from rich.text import Text

from meshterm.core import exitcodes
from meshterm.core.courier_store import DONE_CAP, QUEUED, CourierStore
from meshterm.core.models import ChatMessage, Contact, utcnow
from meshterm.core.watch_store import WatchStore
from meshterm.services.courier import FRESH_S, MAX_ATTEMPTS, CourierService
from meshterm.ui.courier_screen import (
    CANCEL_SCHEDULE,
    WHEN_HEARD,
    _entry_actions,
    _pick_schedule,
    parse_clock,
)

NODE = "3d" * 6
CONTACT = Contact(name="Hub", public_key="3d" * 32)


class _StubChat:
    """Scripted chat service: pops the next ack outcome per send."""

    def __init__(self, outcomes: list[bool]) -> None:
        self.outcomes = list(outcomes)
        self.sent: list[tuple[str, str]] = []

    async def send_direct(self, contact: Contact, text: str) -> ChatMessage:
        self.sent.append((contact.name, text))
        acked = self.outcomes.pop(0) if self.outcomes else False
        return ChatMessage(text=text, outbound=True, acked=acked)


class _StubDevice:
    async def get_contacts(self) -> list[Contact]:
        return [CONTACT]


class _StubContext:
    """Minimal stand-in for :class:`~meshterm.context.AppContext`."""

    def __init__(self, tmp_path: Path, outcomes: list[bool]) -> None:
        self.courier_store = CourierStore(tmp_path / "courier.json")
        self.watch_store = WatchStore(tmp_path / "watchtower.json")
        self.chat = _StubChat(outcomes)
        self.is_connected = True
        self.log = logging.getLogger("test.courier")
        self._device = _StubDevice()

    async def device(self) -> _StubDevice:
        return self._device


def _service(tmp_path: Path, outcomes: list[bool]) -> CourierService:
    return CourierService(_StubContext(tmp_path, outcomes))


# --- the store --------------------------------------------------------------------------


def test_store_queue_round_trips_and_persists(tmp_path: Path) -> None:
    """Queued entries survive a fresh store instance with their schedule intact."""
    path = tmp_path / "courier.json"
    store = CourierStore(path)
    when = utcnow() + timedelta(hours=8)
    queued = store.queue(NODE, "Hub", "hello there", not_before=when)
    assert queued.ident == 1 and queued.status == QUEUED

    again = CourierStore(path)
    entry = again.get(1)
    assert entry is not None and entry.text == "hello there"
    assert entry.not_before == when
    assert again.pending_count() == 1


def test_store_lifecycle_attempts_finish_cancel_clear(tmp_path: Path) -> None:
    """Attempt marks, delivery, cancellation, and clearing all behave."""
    store = CourierStore(tmp_path / "courier.json")
    a = store.queue(NODE, "Hub", "one")
    b = store.queue(NODE, "Hub", "two")
    store.note_attempt(a.ident)
    assert store.get(a.ident).attempts == 1
    store.mark_delivered(a.ident)
    assert store.pending() == [store.get(b.ident)]
    assert store.cancel(b.ident) is True
    assert store.pending_count() == 0
    assert store.get(a.ident) is not None  # delivered history remains
    store.clear_done()
    assert store.entries() == []


def test_store_caps_the_finished_history(tmp_path: Path) -> None:
    """Old finished entries fall off; the waiting queue is never trimmed."""
    store = CourierStore(tmp_path / "courier.json")
    keeper = store.queue(NODE, "Hub", "still waiting")
    for i in range(DONE_CAP + 5):
        entry = store.queue(NODE, "Hub", f"m{i}")
        store.mark_delivered(entry.ident)
    done = [m for m in store.entries() if m.status != QUEUED]
    assert len(done) == DONE_CAP
    assert store.get(keeper.ident) is not None


# --- eligibility -------------------------------------------------------------------------


def test_eligibility_waits_for_freshness_and_schedule(tmp_path: Path) -> None:
    """Plain entries need the contact heard; scheduled ones hold until their time."""
    service = _service(tmp_path, [])
    store = service._ctx.courier_store
    now = utcnow()

    plain = store.queue(NODE, "Hub", "hi")
    assert not service.eligible(plain, now)  # never heard this session
    service._heard[NODE] = now - timedelta(seconds=FRESH_S + 1)
    assert not service.eligible(plain, now)  # heard, but too long ago
    service._heard[NODE] = now
    assert service.eligible(plain, now)

    scheduled = store.queue(NODE, "Hub", "later", not_before=now + timedelta(hours=1))
    assert not service.eligible(scheduled, now)  # the schedule holds it
    # Past its time, a scheduled entry's *first* shot fires even unheard-of.
    service._heard.clear()
    assert service.eligible(scheduled, now + timedelta(hours=2))


def test_eligibility_backs_off_after_failures(tmp_path: Path) -> None:
    """A failed attempt waits out its (doubling) backoff even when the contact is fresh."""
    service = _service(tmp_path, [])
    store = service._ctx.courier_store
    now = utcnow()
    entry = store.queue(NODE, "Hub", "hi")
    service._heard[NODE] = now
    store.note_attempt(entry.ident, when=now)
    entry = store.get(entry.ident)
    assert not service.eligible(entry, now + timedelta(minutes=2))
    assert service.eligible(entry, now + timedelta(minutes=6))  # 5-min base elapsed
    assert service.next_retry_s(entry, now + timedelta(minutes=2)) is not None


# --- the attempt flow ---------------------------------------------------------------------


async def test_attempt_delivers_and_raises_the_good_news(tmp_path: Path) -> None:
    """An acknowledged send settles the entry and lights the Watchtower badge."""
    service = _service(tmp_path, [True])
    ctx = service._ctx
    entry = ctx.courier_store.queue(NODE, "Hub", "hello")
    service._heard[NODE] = utcnow()

    await service._pass()
    assert ctx.chat.sent == [("Hub", "hello")]
    settled = ctx.courier_store.get(entry.ident)
    assert settled.status == "delivered" and settled.attempts == 1
    alerts = ctx.watch_store.alerts()
    assert len(alerts) == 1 and alerts[0].kind == "courier"
    assert "delivered" in alerts[0].message


async def test_attempt_gives_up_after_the_budget(tmp_path: Path) -> None:
    """Unacknowledged attempts exhaust the budget and say so, exactly once."""
    service = _service(tmp_path, [False] * MAX_ATTEMPTS)
    ctx = service._ctx
    entry = ctx.courier_store.queue(NODE, "Hub", "hello")
    for _ in range(MAX_ATTEMPTS):
        message = ctx.courier_store.get(entry.ident)
        await service._attempt(message)
    settled = ctx.courier_store.get(entry.ident)
    assert settled.status == "gave-up" and settled.attempts == MAX_ATTEMPTS
    gave = [a for a in ctx.watch_store.alerts() if "gave up" in a.message]
    assert len(gave) == 1


async def test_pass_attempts_at_most_one_entry(tmp_path: Path) -> None:
    """A backlog drains one message per pass — the courier never bursts."""
    service = _service(tmp_path, [True, True])
    ctx = service._ctx
    ctx.courier_store.queue(NODE, "Hub", "first")
    ctx.courier_store.queue(NODE, "Hub", "second")
    service._heard[NODE] = utcnow()
    await service._pass()
    assert len(ctx.chat.sent) == 1
    await service._pass()
    assert len(ctx.chat.sent) == 2
    assert [t for _n, t in ctx.chat.sent] == ["first", "second"]  # oldest first


async def test_unknown_contact_spends_no_budget(tmp_path: Path) -> None:
    """A recipient the device doesn't know yet stays queued, untouched."""
    service = _service(tmp_path, [True])
    ctx = service._ctx
    entry = ctx.courier_store.queue("ff" * 6, "Stranger", "hello")
    outcome = await service._attempt(ctx.courier_store.get(entry.ident))
    assert outcome == "unknown contact"
    settled = ctx.courier_store.get(entry.ident)
    assert settled.status == QUEUED and settled.attempts == 0
    assert ctx.chat.sent == []


async def test_attempt_now_forces_a_send(tmp_path: Path) -> None:
    """The screen's Send now works regardless of freshness or schedule."""
    service = _service(tmp_path, [True])
    ctx = service._ctx
    entry = ctx.courier_store.queue(NODE, "Hub", "hello", not_before=utcnow() + timedelta(hours=8))
    assert await service.attempt_now(entry.ident) == "delivered"
    assert await service.attempt_now(entry.ident) == "gone"  # already settled


# --- the scripted CLI actions -------------------------------------------------------------


class _NoteUi:
    """A UI surface that just collects notes and shown renderables."""

    def __init__(self) -> None:
        self.notes: list[str] = []
        self.shown: list[object] = []

    def note(self, markup: str) -> None:
        self.notes.append(markup)

    def ack(self, markup: str) -> None:
        # The menu's answer: an acknowledgement is a note. (The scripted CLI drops it.)
        self.note(markup)

    def show(self, *renderables: object) -> None:
        self.shown.extend(renderables)


class _StubCourier:
    """A courier service whose ``attempt_now`` returns a canned outcome."""

    def __init__(self, store: CourierStore, outcome: str) -> None:
        self._store = store
        self._outcome = outcome

    async def attempt_now(self, ident: int) -> str:
        message = self._store.get(ident)
        if message is None or message.status != QUEUED:
            return "gone"
        if self._outcome == "delivered":
            self._store.mark_delivered(ident)
        return self._outcome


class _ToolCtx:
    """Minimal context for the courier tool's scripted CLI actions (no device needed)."""

    def __init__(self, tmp_path: Path, *, outcome: str = "delivered") -> None:
        self.courier_store = CourierStore(tmp_path / "courier.json")
        self.ui = _NoteUi()
        self.courier = _StubCourier(self.courier_store, outcome)


async def test_cli_list_renders_waiting_and_finished(tmp_path: Path) -> None:
    """`courier list` shows the outbox without needing a device."""
    from meshterm.tools.courier import CourierTool

    ctx = _ToolCtx(tmp_path)
    ctx.courier_store.queue(NODE, "Hub", "still waiting")
    done = ctx.courier_store.queue(NODE, "Hub", "landed")
    ctx.courier_store.mark_delivered(done.ident)

    result = await CourierTool().run(ctx, {"cli_action": "list"})
    assert result.summary == {"entries": 2}
    # The outbox is *stated*, not printed: the tool hands back the rows and the CLI
    # boundary picks a renderer for them (see meshterm.ui.report).
    listing = result.report[0]
    assert sorted(row["state"] for row in listing.rows) == ["delivered", "waiting"]
    assert sorted(row["text"] for row in listing.rows) == ["landed", "still waiting"]


async def test_cli_list_empty_notes_and_counts_zero(tmp_path: Path) -> None:
    """An empty outbox reports zero entries and shows no table."""
    from meshterm.tools.courier import CourierTool

    ctx = _ToolCtx(tmp_path)
    result = await CourierTool().run(ctx, {"cli_action": "list"})
    assert result.summary == {"entries": 0}
    assert result.exit_code == exitcodes.NO_RESULT
    # An empty listing, not an absent one: the plain face draws nothing from it and the
    # machine face gets `[]`, which is a document a consumer can read.
    assert result.report[0].rows == []


async def test_cli_cancel_removes_a_waiting_entry(tmp_path: Path) -> None:
    """`courier cancel` drops a waiting entry; a second cancel is a no-op."""
    from meshterm.tools.courier import CourierTool

    ctx = _ToolCtx(tmp_path)
    entry = ctx.courier_store.queue(NODE, "Hub", "nope")
    tool = CourierTool()

    result = await tool.run(ctx, {"cli_action": "cancel", "id": entry.ident})
    assert result.summary == {"id": entry.ident, "cancelled": True}
    assert ctx.courier_store.get(entry.ident) is None

    again = await tool.run(ctx, {"cli_action": "cancel", "id": entry.ident})
    assert again.summary == {"id": entry.ident, "cancelled": False}


async def test_cli_send_forces_one_attempt(tmp_path: Path) -> None:
    """`courier send` forces one delivery attempt and reports the outcome."""
    from meshterm.tools.courier import CourierTool

    ctx = _ToolCtx(tmp_path, outcome="delivered")
    entry = ctx.courier_store.queue(NODE, "Hub", "hello")
    result = await CourierTool().run(ctx, {"cli_action": "send", "id": entry.ident})
    assert result.summary == {"id": entry.ident, "outcome": "delivered"}


async def test_cli_send_unknown_entry_is_a_bad_argument(tmp_path: Path) -> None:
    """An id nobody has is a *usage* error, and it used to claim the device had failed.

    The outbox is a local file: nothing was transmitted, and no retry will make an id
    exist. Exit 4 tells a caller "the radio was reached and the operation failed, try
    again" — which sent a scheduled sender into a retry loop over a typo. Exit 2 says fix
    the command, which is the truth.
    """
    import typer

    from meshterm.tools.courier import CourierTool

    ctx = _ToolCtx(tmp_path)
    with pytest.raises(typer.BadParameter):
        await CourierTool().run(ctx, {"cli_action": "send", "id": 999})


async def test_cli_clear_drops_finished_only(tmp_path: Path) -> None:
    """`courier clear` removes finished entries and leaves the waiting queue."""
    from meshterm.tools.courier import CourierTool

    ctx = _ToolCtx(tmp_path)
    ctx.courier_store.queue(NODE, "Hub", "still here")
    done = ctx.courier_store.queue(NODE, "Hub", "gone soon")
    ctx.courier_store.mark_delivered(done.ident)

    result = await CourierTool().run(ctx, {"cli_action": "clear"})
    assert result.summary == {"cleared": 1}
    assert [m.text for m in ctx.courier_store.entries()] == ["still here"]


# --- the clock parser ---------------------------------------------------------------------


def test_parse_clock_finds_the_next_occurrence() -> None:
    """HH:MM resolves to the next future occurrence, local, returned as UTC."""
    now = utcnow()
    when = parse_clock("07:00", now)
    assert when is not None and when > now
    assert (when - now) <= timedelta(days=1)
    assert when.astimezone().hour == 7 and when.astimezone().minute == 0
    assert parse_clock("7h30", now) is not None
    assert parse_clock("25:00", now) is None
    assert parse_clock("soonish", now) is None


# --- the schedule picker ------------------------------------------------------------------


class _StubScheduleSession:
    """Scripts the when-to-send picker: ``choose`` maps the offered rows to a selection."""

    def __init__(self, choose) -> None:
        self._choose = choose

    async def select(self, title, items, **kwargs):
        return self._choose(items)

    async def text(self, *args, **kwargs):  # pragma: no cover - unused on these paths
        return ""


class _ScheduleCtx:
    def __init__(self, session) -> None:
        self.ui = SimpleNamespace(session=session)


async def test_pick_schedule_when_next_heard_returns_no_schedule() -> None:
    """Picking *When it's next heard* returns ``None`` (queue with no hold), not a cancel.

    Regression: the row once carried the value ``None``, which ``session.select`` also
    returns on Esc, so choosing it read as a cancel and the message was never queued.
    """
    ctx = _ScheduleCtx(_StubScheduleSession(lambda items: items[0].value))
    result = await _pick_schedule(ctx, "Hub")
    assert result is None
    assert result is not CANCEL_SCHEDULE
    assert WHEN_HEARD is not None  # the row's own sentinel, distinct from Esc's None


async def test_pick_schedule_esc_cancels_the_queueing() -> None:
    """Esc on the picker (``select`` returns ``None``) backs out without queueing anything."""
    ctx = _ScheduleCtx(_StubScheduleSession(lambda items: None))
    assert await _pick_schedule(ctx, "Hub") is CANCEL_SCHEDULE


async def test_pick_schedule_a_fixed_delay_holds_until_its_time() -> None:
    """A concrete offset row (e.g. In 1 h) comes back as its aware future datetime."""
    ctx = _ScheduleCtx(_StubScheduleSession(lambda items: items[1].value))  # In 1 h
    result = await _pick_schedule(ctx, "Hub")
    assert result is not None and result is not CANCEL_SCHEDULE
    assert result > utcnow()


# --- the live outbox screen --------------------------------------------------------------


def _outbox_ctx(tmp_path: Path) -> _StubContext:
    ctx = _StubContext(tmp_path, [])
    ctx.courier = CourierService(ctx)
    return ctx


def _outbox_plain(screen, width: int = 100) -> str:
    import re

    return "\n".join(re.sub(r"\x1b\[[0-9;]*m", "", ln) for ln in screen.render_body(width))


def test_outbox_refresh_moves_a_delivered_entry_without_a_keypress(tmp_path: Path) -> None:
    """A delivery lands its row in Finished on refresh(), no action required."""
    from meshterm.ui.courier_screen import CourierOutboxScreen

    ctx = _outbox_ctx(tmp_path)
    entry = ctx.courier_store.queue(NODE, "Hub", "hold this")
    screen = CourierOutboxScreen(ctx)
    before = _outbox_plain(screen)
    assert "⏳ Hub" in before and "Finished" not in before

    ctx.courier_store.mark_delivered(entry.ident)
    screen.refresh()
    after = _outbox_plain(screen)
    assert "Finished" in after and re.search(r"✓ +Hub", after) and "⏳" not in after


def test_outbox_refresh_keeps_the_highlight_on_its_entry(tmp_path: Path) -> None:
    """A row finishing above the cursor doesn't drag the highlight off its entry."""
    from meshterm.ui.courier_screen import CourierOutboxScreen

    ctx = _outbox_ctx(tmp_path)
    first = ctx.courier_store.queue(NODE, "Hub", "first")
    second = ctx.courier_store.queue(NODE, "Hub", "second")
    screen = CourierOutboxScreen(ctx, default=("msg", second.ident))
    assert screen._current_choice().value == ("msg", second.ident)

    ctx.courier_store.mark_delivered(first.ident)
    screen.refresh()
    assert screen._current_choice().value == ("msg", second.ident)


def test_outbox_refresh_without_change_recomposes_nothing(tmp_path: Path) -> None:
    """An unchanged store shape leaves the row objects alone (no churn per tick)."""
    from meshterm.ui.courier_screen import CourierOutboxScreen

    ctx = _outbox_ctx(tmp_path)
    ctx.courier_store.queue(NODE, "Hub", "steady")
    screen = CourierOutboxScreen(ctx)
    items = screen._items
    screen.refresh()
    assert screen._items is items


def test_outbox_rows_recompute_live_state_per_repaint(tmp_path: Path) -> None:
    """The waiting row's text is a callable: a state change shows on the next paint."""
    from meshterm.ui.courier_screen import CourierOutboxScreen

    ctx = _outbox_ctx(tmp_path)
    entry = ctx.courier_store.queue(NODE, "Hub", "patience")
    screen = CourierOutboxScreen(ctx)
    assert "waiting to hear the contact" in _outbox_plain(screen)

    # An attempt just happened: the same row now shows the retry countdown —
    # no refresh() needed, the callable title re-reads the entry on repaint.
    ctx.courier_store.note_attempt(entry.ident)
    assert "try 1" in _outbox_plain(screen)


def _title_plain(choice) -> str:
    """A row's label as plain text, resolving a live (callable) title the way a paint does."""
    title = choice.title() if callable(choice.title) else choice.title
    return title.plain if isinstance(title, Text) else title


def _outbox_titles(tmp_path: Path) -> list[str]:
    """Every row of an outbox holding one waiting, one delivered and one given-up entry."""
    from meshterm.ui.courier_screen import CourierOutboxScreen

    ctx = _outbox_ctx(tmp_path)
    ctx.courier_store.queue(NODE, "Waiting", "hold this")
    landed = ctx.courier_store.queue(NODE, "Landed", "got it")
    ctx.courier_store.mark_delivered(landed.ident)
    lost = ctx.courier_store.queue(NODE, "Lost", "never")
    ctx.courier_store.mark_gave_up(lost.ident)
    return [_title_plain(choice) for choice in CourierOutboxScreen(ctx)._choices()]


async def _entry_action_titles(tmp_path: Path) -> list[str]:
    """The labels a waiting entry's action menu offers (the menu is dismissed unanswered)."""
    offered: list = []

    class _Session:
        async def select(self, title, items, **kwargs):
            offered.extend(items)
            return None

    store = CourierStore(tmp_path / "courier.json")
    entry = store.queue(NODE, "Hub", "hello")
    ctx = SimpleNamespace(ui=SimpleNamespace(session=_Session()), courier_store=store)
    await _entry_actions(ctx, entry.ident)
    return [_title_plain(choice) for choice in offered]


def _word_starts(rows: list[str], leads: dict[str, str]) -> set[int]:
    """The display cell each row's first word starts in, checking the mark it leads with."""
    starts = set()
    for word, mark in leads.items():
        row = next(row for row in rows if word in row)
        assert row.startswith(mark), f"{word!r} lost its mark: {row!r}"
        starts.add(cell_len(row[: row.index(word)]))
    return starts


async def test_courier_rows_start_every_label_in_the_same_cell(tmp_path: Path) -> None:
    """Both of the courier's lists share one icon column, whatever each mark's width.

    The outbox mixes two-cell marks (⏳ a waiting entry, 📨 the queue row) with one-cell ones
    (✓ ✗ a finished entry, 🗑 the clear row), and wrote each as ``mark + " "`` — so a finished
    recipient sat a column left of a waiting one and *Clear finished* a column left of
    *Queue a message…*. An entry's actions did the same with 📤 over ✗. Cells, not
    characters, are the measure: that is what the terminal lines up.
    """
    outbox = {"Waiting": "⏳", "Queue": "📨", "Landed": "✓", "Lost": "✗", "Clear": "🗑"}
    actions = {"Send": "📤", "Cancel": "✗"}
    assert {cell_len(mark) for mark in outbox.values()} == {1, 2}, "a mixed list, or no proof"
    assert {cell_len(mark) for mark in actions.values()} == {1, 2}

    assert len(_word_starts(_outbox_titles(tmp_path), outbox)) == 1
    assert len(_word_starts(await _entry_action_titles(tmp_path), actions)) == 1


async def test_courier_command_rows_go_bare_where_the_platform_draws_no_icons(
    tmp_path: Path,
) -> None:
    """No icon lane: the command icons go with no padding left, and the entry marks stay.

    An entry's ✓/✗/⏳ is its outcome, not decoration, so the PicoCalc keeps it — and keeps
    those rows aligned with one another — while the queue, clear, send and cancel rows lose
    their icons exactly as every other command row does there.
    """
    from meshterm.platforms import PICOCALC, REGULAR, set_platform

    set_platform(PICOCALC)
    try:
        rows = _outbox_titles(tmp_path / "outbox")
        assert "Queue a message…" in rows and "Clear finished" in rows
        marks = {"Waiting": "⏳", "Landed": "✓", "Lost": "✗"}
        assert len(_word_starts(rows, marks)) == 1
        assert await _entry_action_titles(tmp_path / "actions") == [
            "Send now — one forced attempt",
            "Cancel this message",
        ]
    finally:
        set_platform(REGULAR)


# --- the recipient picker ----------------------------------------------------------------


def test_recipient_picker_rides_the_shared_node_list(tmp_path: Path) -> None:
    """The picker draws the full lanes, opens freshest-heard first, and Enter commits."""
    from meshterm.ui.contactlist import SORT_COLUMNS, SORT_OPENS_ASCENDING
    from meshterm.ui.courier_screen import _PICK_HINT, CourierRecipientScreen
    from meshterm.ui.widgets import ContactsSort

    fresh = Contact(name="Fresh", public_key="aa" * 32, last_seen=utcnow())
    stale = Contact(name="Stale", public_key="bb" * 32, last_seen=utcnow() - timedelta(days=2))
    counts = {"aa" * 6: 7}
    screen = CourierRecipientScreen(
        contacts=[stale, fresh],
        prefix_bytes=1,
        counts=counts,
        sort=ContactsSort.from_name("heard", SORT_COLUMNS, SORT_OPENS_ASCENDING),
    )
    import re

    body = "\n".join(re.sub(r"\x1b\[[0-9;]*m", "", ln) for ln in screen.render_body(80))
    assert "NAME" in body and "HEARD" in body and "PKTS" in body and "KEY" in body
    assert body.index("Fresh") < body.index("Stale")  # heard opens freshest-first
    assert "    7" in body  # Fresh's overheard tally fills the PKTS lane
    assert screen.footer_hint == _PICK_HINT

    # Enter resolves the highlighted row's value — the Contact itself.
    resolved: list = []
    screen.resolve = resolved.append  # type: ignore[method-assign]
    screen.handle("enter")
    assert resolved == [fresh]


def test_recipient_picker_sort_keys_walk_the_ring(tmp_path: Path) -> None:
    """The same ^←→ keys the Nodes list uses re-sort the picker's columns."""
    from meshterm.ui.contactlist import SORT_COLUMNS, SORT_OPENS_ASCENDING
    from meshterm.ui.courier_screen import CourierRecipientScreen
    from meshterm.ui.widgets import ContactsSort

    a = Contact(name="Alpha", public_key="aa" * 32, last_seen=utcnow())
    z = Contact(name="Zulu", public_key="bb" * 32)
    sort = ContactsSort.from_name("heard", SORT_COLUMNS, SORT_OPENS_ASCENDING)
    screen = CourierRecipientScreen(contacts=[z, a], prefix_bytes=0, counts={}, sort=sort)
    screen.handle("ctrl_left")  # heard -> name (opens ascending)
    assert sort.column == "name" and sort.ascending
    values = [c.value for c in screen._choices()]
    assert values == [a, z]