from django.db import models
from django.utils.translation import gettext_lazy as _


class LanguageQuerySet(models.QuerySet):
    """QuerySet for model Language"""

    def by_locale(self, locale: str) -> models.QuerySet:
        """Filter by locale"""
        return self.filter(locale=locale)

    def by_title(self, title: str) -> models.QuerySet:
        """Filter by title"""
        return self.filter(title=title)


class Language(models.Model):
    """Language model."""

    title = models.CharField(max_length=255,
                             verbose_name=_('Language title'))
    locale = models.CharField(max_length=10,
                              verbose_name=_('Locale identifier'))

    objects = LanguageQuerySet.as_manager()

    class Meta:
        verbose_name = _('Language')
        verbose_name_plural = _('Languages')

    def __str__(self):
        """String method"""
        return f'{self.title} ({self.locale})'