from plomtask.db import DatabaseConnection
from plomtask.days import Day
from plomtask.processes import Process
-from plomtask.exceptions import NotFoundException
+from plomtask.exceptions import (NotFoundException, BadFormatException,
+ HandledException)
class Todo:
self.process = process
self.is_done = is_done
self.day = day
-
- def __eq__(self, other: object) -> bool:
- return isinstance(other, self.__class__) and self.id_ == other.id_
+ self.children: list[Todo] = []
+ self.parents: list[Todo] = []
@classmethod
- def from_table_row(cls, row: Row, db_conn: DatabaseConnection) -> Todo:
- """Make Todo from database row."""
- return cls(id_=row[0],
+ def from_table_row(cls, db_conn: DatabaseConnection, row: Row) -> Todo:
+ """Make Todo from database row, write to DB cache."""
+ todo = cls(id_=row[0],
process=Process.by_id(db_conn, row[1]),
- is_done=row[2],
+ is_done=bool(row[2]),
day=Day.by_date(db_conn, row[3]))
+ assert todo.id_ is not None
+ db_conn.cached_todos[todo.id_] = todo
+ return todo
+
+ @classmethod
+ def by_id(cls, db_conn: DatabaseConnection, id_: int | None) -> Todo:
+ """Get Todo of .id_=id_ and children (from DB cache if possible)."""
+ if id_ in db_conn.cached_todos.keys():
+ todo = db_conn.cached_todos[id_]
+ else:
+ todo = None
+ for row in db_conn.exec('SELECT * FROM todos WHERE id = ?',
+ (id_,)):
+ todo = cls.from_table_row(db_conn, row)
+ break
+ if todo is None:
+ raise NotFoundException(f'Todo of ID not found: {id_}')
+ for row in db_conn.exec('SELECT child FROM todo_children '
+ 'WHERE parent = ?', (id_,)):
+ todo.children += [cls.by_id(db_conn, row[0])]
+ for row in db_conn.exec('SELECT parent FROM todo_children '
+ 'WHERE child = ?', (id_,)):
+ todo.parents += [cls.by_id(db_conn, row[0])]
+ assert isinstance(todo, Todo)
+ return todo
@classmethod
def by_date(cls, db_conn: DatabaseConnection, date: str) -> list[Todo]:
"""Collect all Todos for Day of date."""
todos = []
- for row in db_conn.exec('SELECT * FROM todos WHERE day = ?', (date,)):
- todos += [cls.from_table_row(row, db_conn)]
+ for row in db_conn.exec('SELECT id FROM todos WHERE day = ?', (date,)):
+ todos += [cls.by_id(db_conn, row[0])]
return todos
+ def add_child(self, child: Todo) -> None:
+ """Add child to self.children, guard against recursion"""
+ def walk_steps(node: Todo) -> None:
+ if node.id_ == self.id_:
+ raise BadFormatException('bad child choice causes recursion')
+ for child in node.children:
+ walk_steps(child)
+ if self.id_ is None:
+ raise HandledException('Can only add children to saved Todos.')
+ if child.id_ is None:
+ raise HandledException('Can only add saved children to Todos.')
+ if child in self.children:
+ raise BadFormatException('cannot adopt same child twice')
+ walk_steps(child)
+ self.children += [child]
+ child.parents += [self]
+
def save(self, db_conn: DatabaseConnection) -> None:
- """Write self to DB."""
+ """Write self and children to DB and its cache."""
if self.process.id_ is None:
raise NotFoundException('Process of Todo without ID (not saved?)')
cursor = db_conn.exec('REPLACE INTO todos VALUES (?,?,?,?)',
(self.id_, self.process.id_,
self.is_done, self.day.date))
self.id_ = cursor.lastrowid
+ assert self.id_ is not None
+ db_conn.cached_todos[self.id_] = self
+ db_conn.exec('DELETE FROM todo_children WHERE parent = ?',
+ (self.id_,))
+ for child in self.children:
+ db_conn.exec('INSERT INTO todo_children VALUES (?, ?)',
+ (self.id_, child.id_))