390 lines
15 KiB
Python
390 lines
15 KiB
Python
"""The ScheduleRule model: rule types, validation, and serialization.
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A :class:`ScheduleRule` describes WHEN a recurring chore fires — a pure
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frozen dataclass with no Home Assistant and no database imports. The
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evaluation engine (Feature 04) consumes it; the DAO layer (Feature 02)
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serializes its dict form into the ``schedule_rules`` table.
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Type model: one enum member per recurrence shape. ``MONTHLY_DAY``
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("the 15th of every month") and ``MONTHLY_WEEKDAY`` ("the second
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Tuesday of every month") are distinct types rather than one monthly
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type with optional fields, so validation is total: a rule either
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constructs, or raises :class:`RuleValidationError` naming the offending
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field. Every type carries ONLY the fields its shape needs; carrying
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any other shape's field is a construction error.
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Storage mapping (Feature 02, ``schedule_rules`` table): the enum's
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``storage_value`` maps model types onto the schema's CHECK values —
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MONTHLY_DAY and MONTHLY_WEEKDAY both store as ``'monthly'`` and are
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disambiguated by which fields are populated; CUSTOM_DAYS stores as
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``'custom'``. ``weekday_set`` round-trips as the sorted CSV list the
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table stores (one element for MONTHLY_WEEKDAY, which names the
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position's weekday); ``nth_weekday_weekday`` is a MODEL-ONLY field
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carried through from_dict/to_dict for losslessness and folded into
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``weekday_set`` by the DAO mapping. ``to_dict``/``from_dict`` are the
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model-side lossless pair; the DB mapping lives in the DAO layer and is
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exercised there.
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Validation policy (fail fast at construction — the schema's CHECK
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constraints are a second line of defense, but invalid rules must never
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reach storage):
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- ``interval`` >= 1 for every rule.
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- ``weekday_set`` is required for WEEKLY and CUSTOM_DAYS, forbidden
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elsewhere; entries are 0 (Monday) .. 6 (Sunday), no booleans.
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- ``day_of_month`` 1..31 is required for MONTHLY_DAY.
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- ``nth_weekday`` 1..5 or -1 (0 is meaningless as a position and is
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rejected) with a weekday 0..6 for MONTHLY_WEEKDAY.
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- ``month`` 1..12 is required for YEARLY.
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- ``start_date`` is a strict ISO date; ``end_date`` is optional and,
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when present, on or after ``start_date``.
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Month-end policy (documented for Feature 04): a MONTHLY_DAY rule for
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the 31st does NOT fire in a 30-day month, and a YEARLY rule for
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February 29th does NOT fire in a non-leap year — the engine skips
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instead of clamping to month end, because clamping silently moves
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"the 31st" to "the 30th" and double-fires tasks.
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"""
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from __future__ import annotations
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import datetime
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import enum
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from dataclasses import dataclass, field
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#: Date-shape policy: strict YYYY-MM-DD, matching the DAO layers.
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_DATE_FORMAT = "%Y-%m-%d"
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#: Weekday-name policy: 0 = Monday .. 6 = Sunday (ISO order).
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class RuleType(enum.Enum):
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"""The six recurrence shapes the engine supports.
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``storage_value`` is the string written to the ``schedule_rules``
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table's ``rule_type`` column (its CHECK whitelist). MONTHLY_DAY
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and MONTHLY_WEEKDAY are distinct shapes sharing one storage value,
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disambiguated by which fields are populated.
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"""
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DAILY = "daily"
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WEEKLY = "weekly"
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MONTHLY_DAY = "monthly_day"
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MONTHLY_WEEKDAY = "monthly_weekday"
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YEARLY = "yearly"
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CUSTOM_DAYS = "custom_days"
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@property
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def storage_value(self) -> str:
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"""The schema-level rule_type string this model type maps to."""
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return {
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RuleType.DAILY: "daily",
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RuleType.WEEKLY: "weekly",
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RuleType.MONTHLY_DAY: "monthly",
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RuleType.MONTHLY_WEEKDAY: "monthly",
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RuleType.YEARLY: "yearly",
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RuleType.CUSTOM_DAYS: "custom",
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}[self]
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class RuleValidationError(ValueError):
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"""Raised when a ScheduleRule field combination is invalid."""
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def _validate_date(value: str, field_name: str) -> None:
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"""Raise unless ``value`` is a strict YYYY-MM-DD calendar date."""
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try:
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parsed = datetime.datetime.strptime(value, _DATE_FORMAT).date()
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except (TypeError, ValueError):
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raise RuleValidationError(
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f"{field_name} must be an ISO date (YYYY-MM-DD), got {value!r}"
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) from None
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if parsed.isoformat() != value:
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raise RuleValidationError(
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f"{field_name} must be a strict YYYY-MM-DD date, got {value!r}"
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)
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def _validate_weekday_set(weekday_set) -> frozenset[int]:
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"""Return a normalized frozenset or raise with a clear message.
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Sequence entries are validated BEFORE set() coercion: a list like
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[0, False] must not collapse the boolean into 0, and unhashable
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entries must raise RuleValidationError, never a raw TypeError.
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"""
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if isinstance(weekday_set, (list, tuple)):
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for entry in weekday_set:
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# _is_plain_int: bool and int subclasses (potentially
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# unhashable) are rejected before set() coercion.
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if not _is_plain_int(entry):
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raise RuleValidationError(
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f"weekday_set entries must be plain integers, got "
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f"{entry!r}"
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)
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weekday_set = set(weekday_set)
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if not isinstance(weekday_set, (set, frozenset)):
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raise RuleValidationError(
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f"weekday_set must be a set of weekday integers, got "
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f"{type(weekday_set).__name__}"
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)
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if not weekday_set:
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raise RuleValidationError(
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"weekday_set must not be empty for weekly/custom rules"
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)
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for entry in weekday_set:
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if not _is_plain_int(entry):
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raise RuleValidationError(
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f"weekday_set entries must be plain integers, got "
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f"{entry!r}"
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)
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if not 0 <= entry <= 6:
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raise RuleValidationError(
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f"weekday_set entries must be 0 (Monday)..6 (Sunday), "
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f"got {entry!r}"
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)
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return frozenset(weekday_set)
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def _is_plain_int(value) -> bool:
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"""True only for real ints: bool excluded AND int subclasses too
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(an unhashable int subclass would break the frozen-hashable model)."""
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return type(value) is int
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def _validate_monthly_weekday(nth_weekday, weekday) -> None:
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"""Validate the MONTHLY_WEEKDAY position fields."""
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if nth_weekday is None or not _is_plain_int(nth_weekday):
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raise RuleValidationError(
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"nth_weekday must be an integer for monthly_weekday rules, "
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f"got {nth_weekday!r}"
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)
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if not (-1 <= nth_weekday <= 5) or nth_weekday == 0:
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raise RuleValidationError(
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f"nth_weekday must be -1 (last) or 1..5, got {nth_weekday!r}"
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)
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if weekday is None or not _is_plain_int(weekday) or not 0 <= weekday <= 6:
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raise RuleValidationError(
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f"monthly_weekday rules require a weekday 0 (Monday)..6 "
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f"(Sunday), got {weekday!r}"
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)
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@dataclass(frozen=True)
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class ScheduleRule:
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"""An immutable, validated recurrence rule (see module docstring).
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Construct with keyword arguments; invalid combinations raise
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:class:`RuleValidationError` at construction time. Fields map
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one-to-one onto the ``schedule_rules`` table columns, with
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``nth_weekday_weekday`` as the model-only weekday companion to
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``nth_weekday`` (serialized inside ``weekday_set`` at the DAO
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boundary).
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"""
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rule_type: RuleType
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interval: int = 1
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weekday_set: frozenset[int] | None = None
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day_of_month: int | None = None
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nth_weekday: int | None = None
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nth_weekday_weekday: int | None = None
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month: int | None = None
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start_date: str = "1970-01-01"
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end_date: str | None = None
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def __post_init__(self) -> None:
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# Normalize a string rule_type into the enum; anything else
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# that is not already a RuleType is rejected.
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if isinstance(self.rule_type, str):
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# EXACT model names only: no whitespace stripping, no storage
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# aliases. The DAO maps storage strings to model fields when
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# reading rows; the model boundary stays unambiguous.
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candidates = {rt.name.lower(): rt for rt in RuleType}
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if self.rule_type in candidates:
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object.__setattr__(
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self, "rule_type", candidates[self.rule_type]
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)
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else:
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raise RuleValidationError(
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f"rule_type must be a RuleType or one of "
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f"{sorted(candidates)}, got {self.rule_type!r}"
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)
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if not isinstance(self.rule_type, RuleType):
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raise RuleValidationError(
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f"rule_type must be a RuleType or one of its string "
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f"values, got {self.rule_type!r}"
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)
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if not _is_plain_int(self.interval):
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raise RuleValidationError(
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f"interval must be an integer >= 1, got {self.interval!r}"
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)
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if self.interval < 1:
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raise RuleValidationError(
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f"interval must be >= 1, got {self.interval!r}"
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)
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_validate_date(self.start_date, "start_date")
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if self.end_date is not None:
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_validate_date(self.end_date, "end_date")
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if self.end_date < self.start_date:
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raise RuleValidationError(
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f"end_date {self.end_date!r} must be on or after "
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f"start_date {self.start_date!r}"
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)
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# Type-exclusive field policy, enforced for every type: build
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# the dict of present fields, then reject every field the shape
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# must not carry (weekday_set present is detectable via None vs
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# set even after normalization below).
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shape = self.rule_type
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if shape is RuleType.DAILY:
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forbidden_fields = (
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"weekday_set",
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"day_of_month",
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"nth_weekday",
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"nth_weekday_weekday",
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"month",
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)
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elif shape is RuleType.WEEKLY:
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forbidden_fields = (
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"day_of_month",
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"nth_weekday",
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"nth_weekday_weekday",
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"month",
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)
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elif shape is RuleType.CUSTOM_DAYS:
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forbidden_fields = (
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"day_of_month",
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"nth_weekday",
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"nth_weekday_weekday",
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"month",
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)
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elif shape is RuleType.MONTHLY_DAY:
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forbidden_fields = ("weekday_set", "nth_weekday",
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"nth_weekday_weekday", "month")
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elif shape is RuleType.MONTHLY_WEEKDAY:
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forbidden_fields = ("weekday_set", "day_of_month", "month")
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else: # YEARLY
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forbidden_fields = (
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"weekday_set",
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"day_of_month",
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"nth_weekday",
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"nth_weekday_weekday",
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)
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present_forbidden = [
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name
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for name in forbidden_fields
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if getattr(self, name) is not None
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]
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if present_forbidden:
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raise RuleValidationError(
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f"{shape.value} rules must not set "
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f"{', '.join(sorted(present_forbidden))}"
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)
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# Required fields per shape.
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if shape is RuleType.WEEKLY or shape is RuleType.CUSTOM_DAYS:
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normalized = _validate_weekday_set(self.weekday_set)
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object.__setattr__(self, "weekday_set", normalized)
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elif shape is RuleType.MONTHLY_DAY:
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if self.day_of_month is None or not _is_plain_int(
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self.day_of_month
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):
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raise RuleValidationError(
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"monthly_day rules require day_of_month (1..31)"
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)
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if not 1 <= self.day_of_month <= 31:
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raise RuleValidationError(
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f"day_of_month must be 1..31, got {self.day_of_month!r}"
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)
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elif shape is RuleType.MONTHLY_WEEKDAY:
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_validate_monthly_weekday(
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self.nth_weekday, self.nth_weekday_weekday
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)
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elif shape is RuleType.YEARLY:
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if self.month is None or not _is_plain_int(self.month):
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raise RuleValidationError(
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"yearly rules require month (1..12)"
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)
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if not 1 <= self.month <= 12:
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raise RuleValidationError(
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f"month must be 1..12, got {self.month!r}"
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)
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def to_dict(self) -> dict:
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"""Return the lossless dict form (model-side storage shape).
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``weekday_set`` serializes as a sorted list; MONTHLY_WEEKDAY's
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weekday travels inside it (appended) plus
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``nth_weekday_weekday`` so the pair round-trips without
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ambiguity at the model layer.
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"""
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return {
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"rule_type": self.rule_type.name.lower(), # model name
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"interval": self.interval,
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"weekday_set": (
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sorted(self.weekday_set) if self.weekday_set is not None
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else None
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),
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"day_of_month": self.day_of_month,
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"nth_weekday": self.nth_weekday,
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"nth_weekday_weekday": self.nth_weekday_weekday,
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"month": self.month,
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"start_date": self.start_date,
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"end_date": self.end_date,
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}
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@classmethod
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def from_dict(cls, data: dict) -> "ScheduleRule":
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"""Rebuild a rule from :meth:`to_dict` output.
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Raises :class:`RuleValidationError` on unknown keys, missing
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keys, or invalid combinations — never a raw TypeError.
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"""
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if not isinstance(data, dict):
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raise RuleValidationError(
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f"rule data must be a dict, got {type(data).__name__}"
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)
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allowed = {
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"rule_type",
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"interval",
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"weekday_set",
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"day_of_month",
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"nth_weekday",
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"nth_weekday_weekday",
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"month",
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"start_date",
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"end_date",
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}
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unknown = [key for key in data if key not in allowed]
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if unknown:
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raise RuleValidationError(
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f"unknown rule fields: {sorted(unknown, key=repr)}"
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)
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if "rule_type" not in data:
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raise RuleValidationError("missing required rule field: rule_type")
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weekday_set = data.get("weekday_set")
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if isinstance(weekday_set, (list, tuple)):
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# Validate entries as plain ints BEFORE set() coercion, so a
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# list like [0, False] cannot collapse False into 0 and an
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# unhashable/int-subclass entry cannot leak a raw TypeError.
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for entry in weekday_set:
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if not _is_plain_int(entry):
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raise RuleValidationError(
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f"weekday_set entries must be plain integers, got "
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f"{entry!r}"
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)
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weekday_set = set(weekday_set)
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return cls(
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rule_type=data["rule_type"],
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interval=data.get("interval", 1),
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weekday_set=weekday_set,
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day_of_month=data.get("day_of_month"),
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nth_weekday=data.get("nth_weekday"),
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nth_weekday_weekday=data.get("nth_weekday_weekday"),
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month=data.get("month"),
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start_date=data.get("start_date", "1970-01-01"),
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end_date=data.get("end_date"),
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)
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