#!/usr/bin/env python3
"""
Some custom validators for the user model.
"""
from django.core.validators import BaseValidator
from django.core.exceptions import ValidationError

class MaximumLengthValidator:
	"""
	Validate whether the password exceeds a maximum length.
	"""
	def __init__(self, max_length=1024):
		self.max_length = max_length

	def validate(self, password, user=None):
		if len(password) > self.max_length:
			raise ValidationError(
				"This password is too long. It must contain at most " \
				+ f"{self.max_length} characters.",
				code="password_too_long",
				params={'max_length': self.max_length}
			)

	def get_help_text(self):
		msg = f"Your password must contain less than {self.max_length} " \
			+ "characters."
		return msg


class CharValidator(BaseValidator):
	"""
	Raises a ValidationError with a code of 'invalid_chars' if value is not
	a string or contains letters which are not also within limit_value.
	"""
	message = 'Ensure this value only contains the characters "%(limit_value)s".'
	code = 'invalid_chars'

	def compare(self, value, limit_value):
		assert type(limit_value) == str
		if type(value) != str:
			return True
		for c in value:
			if c not in limit_value:
				return True
		return False