import abc
from inkycal.custom import *

class inkycal_module(metaclass=abc.ABCMeta):
  """Generic base class for inykcal modules"""

  @classmethod
  def __subclasshook__(cls, subclass):
    return (hasattr(subclass, 'generate_image') and
      callable(subclass.generate_image) or
      NotImplemented)

  def __init__(self, section_size, section_config):
    # Initializes base module
    # sets properties shared amongst all sections
    self.config = section_config
    self.width, self.height = section_size
    self.fontsize = 12
    self.margin_x = 0.02
    self.margin_y = 0.05
    self.font = ImageFont.truetype(
      fonts['NotoSans-SemiCondensed'], size = self.fontsize)

  def set(self, help=False, **kwargs):
    """Set attributes of class, e.g. class.set(key=value)
    see that can be changed by setting help to True
    """
    lst = dir(self).copy()
    options = [_ for _ in lst if not _.startswith('_')]
    if 'logger' in options: options.remove('logger')

    if help == True:
      print('The following can be configured:')
      print(options)

    for key, value in kwargs.items():
      if key in options:
        if key == 'fontsize':
          self.font  = ImageFont.truetype(self.font.path, value)
          self.fontsize = value
        else:
          setattr(self, key, value)
          print("set '{}' to '{}'".format(key,value))
      else:
        print('{0} does not exist'.format(key))
        pass

    # Check if validation has been implemented
    try:
      self._validate()
    except AttributeError:
      print('no validation implemented')

  @abc.abstractmethod
  def generate_image(self):
    # Generate image for this module with specified parameters
    raise NotImplementedError(
      'The developers were too lazy to implement this function')