diet-guard/diet_guard/_gate.py
Krzysztof kuhy Rudnicki c310861855 slots: minute-of-day consumers (phase 2 of 3: Python side)
Every Python consumer now speaks slot minutes:

- satisfaction is nearest-slot snapping (_slot_wire.satisfied_by_entries)
  at every "is this slot logged?" site: gate, CLI status, MCP, catering
  occupancy and dedup. Nothing on disk is rewritten; 07:00/10:00 entries
  keep covering 07:15/10:15 after a schedule move.
- log_meal writes slot_fields(minute) before signing (slot + slot_min).
- schedule store and sync encode via schedule_to_wire/from_wire; a
  whole-hour schedule stays byte-identical (f/l/n only).
- CLI ate --hour takes HH or HH:MM; MCP log_meal takes "HH:MM" or a
  legacy int hour, validated against today's slots; get_slots returns
  {minute, label}.
- gate History tab: first/last are HH:MM ttk.Comboboxes (quarter-hour
  list, typed times, Up/Down step without posting the popdown), locked
  as disabled; validation mirrors normalized().
- gate timer fires every 15 min; docs rewritten for minutes.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015npsYVB2PdtWkG7MPAi4tn
2026-10-10 19:53:39 +02:00

87 lines
3.1 KiB
Python

"""Decision logic for the diet_guard slot-based log-to-unlock gate.
This module is GUI-free and side-effect-free so the lock/no-lock decision can
be verified headlessly: the fullscreen window in ``_gatelock.py`` is only a
thin shell around :func:`gate_is_due` and :func:`due_slots`. It composes the
pure slot arithmetic in :mod:`diet_guard._slots` with the logged-slot
state in :mod:`diet_guard._state`; ``now`` is injectable so the
time-of-day rules stay deterministically testable.
The gate fires when any *elapsed* meal slot for today carries no logged meal.
Coming home late therefore surfaces several unlogged slots at once -- a single
lock that backfills the whole day before the PC is usable -- while a normal day
prompts one slot at a time, with no separate weekday code path.
"""
from __future__ import annotations
from typing import TYPE_CHECKING
import freedays
from diet_guard._meal_schedule_store import current_schedule
from diet_guard._slots import missing_slots, slot_label
from diet_guard._state import (
now_local,
)
from diet_guard._state_today import (
logged_slots_today,
)
if TYPE_CHECKING:
from datetime import datetime
def due_slots(now: datetime | None = None) -> tuple[int, ...]:
"""Return today's elapsed-but-unlogged meal slots, ascending.
Args:
now: Reference time (defaults to the current local time); injectable.
Returns:
The slot minutes that still need a meal logged (empty == nothing due).
Empty on a shared free day, whatever the schedule says. The pool is read
from a single local file and never the network, so this cannot hang the
systemd-fired gate, and an unreadable pool reads as "not free" -- the
normal rules apply rather than the gate switching itself off.
"""
reference = now if now is not None else now_local()
if freedays.is_free_day(reference.date()):
return ()
# One schedule for both halves: snapping the log onto a different schedule
# than the one deriving the due slots would leave a logged meal covering a
# checkpoint that is not on the list -- and the real one nagging.
schedule = current_schedule()
return missing_slots(reference, logged_slots_today(schedule), schedule)
def gate_is_due(now: datetime | None = None) -> bool:
"""Return True if the screen should lock until the missing slots are filled.
Args:
now: Reference time (defaults to the current local time); injectable.
Returns:
True if at least one elapsed slot today is unlogged, else False.
"""
return bool(due_slots(now))
def gate_message(now: datetime | None = None) -> str:
"""Return the lock-screen reason line listing the slots to backfill.
Args:
now: Reference time (defaults to the current local time); injectable.
Returns:
A short human-readable explanation of which meals are missing.
"""
missing = due_slots(now)
if not missing:
return "All meals are logged. You're up to date."
labels = ", ".join(slot_label(slot) for slot in missing)
if len(missing) == 1:
return f"Log your {labels} meal to unlock."
return f"Log your meals for {labels} to unlock."