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   1 """Collecting Day and date-related items."""
   2 from datetime import datetime
   3 from sqlite3 import Row
   4 from plomtask.misc import HandledException
   5 from plomtask.db import DatabaseConnection
   6
   7 DATE_FORMAT = '%Y-%m-%d'
   8
   9
  10 def date_valid(date: str):
  11     """Validate date against DATE_FORMAT, return Datetime or None."""
  12     try:
  13         result = datetime.strptime(date, DATE_FORMAT)
  14     except (ValueError, TypeError):
  15         return None
  16     return result
  17
  18
  19 class Day:
  20     """Individual days defined by their dates."""
  21
  22     def __init__(self, date: str):
  23         self.date = date
  24         self.datetime = date_valid(self.date)
  25         if not self.datetime:
  26             raise HandledException(f'Given date of wrong format: {self.date}')
  27
  28     @classmethod
  29     def add(cls, db_conn: DatabaseConnection, date: str):
  30         """Add (or re-write) new Day(date) to database."""
  31         db_conn.exec('REPLACE INTO days VALUES (?)', (date,))
  32
  33     @classmethod
  34     def from_table_row(cls, row: Row):
  35         """Make new Day from database row."""
  36         return cls(row[0])
  37
  38     @classmethod
  39     def all(cls, db_conn: DatabaseConnection):
  40         """Return list of all Days in database."""
  41         days = []
  42         for row in db_conn.exec('SELECT * FROM days'):
  43             days += [cls.from_table_row(row)]
  44         return days
  45
  46     @property
  47     def weekday(self):
  48         """Return what weekday matches self.date."""
  49         return self.datetime.strftime('%A')
  50
  51     def __eq__(self, other: object):
  52         return isinstance(other, self.__class__) and self.date == other.date
  53
  54     def __lt__(self, other):
  55         return self.date < other.date