+ @classmethod
+ def enablers_for_at(cls, db_conn: DatabaseConnection, condition: Condition,
+ date: str) -> list[Todo]:
+ """Collect all Todos of day that enable condition."""
+ enablers = []
+ for row in db_conn.exec('SELECT todo FROM todo_fulfills '
+ 'WHERE condition = ?', (condition.id_,)):
+ todo = cls.by_id(db_conn, row[0])
+ if todo.date == date:
+ enablers += [todo]
+ return enablers
+
+ @classmethod
+ def disablers_for_at(cls, db_conn: DatabaseConnection,
+ condition: Condition, date: str) -> list[Todo]:
+ """Collect all Todos of day that disable condition."""
+ disablers = []
+ for row in db_conn.exec('SELECT todo FROM todo_undoes '
+ 'WHERE condition = ?', (condition.id_,)):
+ todo = cls.by_id(db_conn, row[0])
+ if todo.date == date:
+ disablers += [todo]
+ return disablers
+
+ @property
+ def is_doable(self) -> bool:
+ """Decide whether .is_done settable based on children, Conditions."""
+ for child in self.children:
+ if not child.is_done:
+ return False
+ for condition in self.conditions:
+ if not condition.is_active:
+ return False
+ return True
+
+ @property
+ def process_id(self) -> int | str | None:
+ """Return ID of tasked Process."""
+ return self.process.id_
+
+ @property
+ def is_done(self) -> bool:
+ """Wrapper around self._is_done so we can control its setter."""
+ return self._is_done
+
+ @is_done.setter
+ def is_done(self, value: bool) -> None:
+ if value != self.is_done and not self.is_doable:
+ raise BadFormatException('cannot change doneness of undoable Todo')
+ if self._is_done != value:
+ self._is_done = value
+ if value is True:
+ for condition in self.fulfills:
+ condition.is_active = True
+ for condition in self.undoes:
+ condition.is_active = False
+
+ def set_undoes(self, db_conn: DatabaseConnection, ids: list[int]) -> None:
+ """Set self.undoes to Conditions identified by ids."""
+ self.set_conditions(db_conn, ids, 'undoes')
+
+ def set_fulfills(self, db_conn: DatabaseConnection,
+ ids: list[int]) -> None:
+ """Set self.fulfills to Conditions identified by ids."""
+ self.set_conditions(db_conn, ids, 'fulfills')
+
+ def set_conditions(self, db_conn: DatabaseConnection, ids: list[int],
+ target: str = 'conditions') -> None:
+ """Set self.[target] to Conditions identified by ids."""
+ target_list = getattr(self, target)
+ while len(target_list) > 0:
+ target_list.pop()
+ for id_ in ids:
+ target_list += [Condition.by_id(db_conn, id_)]
+