Exesize

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from django.conf import settings
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from django.db import models
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from django.utils.translation import gettext_lazy as _
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NULLABLE = {"blank": True, "null": True}
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class BaseModel(models.Model):  # base class should subclass 'django.db.models.Model'
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    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_("created_at"), editable=False)
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    updated_at = models.DateTimeField(auto_now=True, verbose_name="_(updated_at)", editable=False)
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    deleted = models.BooleanField(default=False, verbose_name=_("deleted"))
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    class Meta:
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        abstract = True
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    def delete(self, *args, **kwargs):
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        self.deleted = True
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        self.save()
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class NewsManager(models.Manager):
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    def get_queryset(self):
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        return super().get_queryset().filter(deleted=False)
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class News(BaseModel):
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    objects = NewsManager()
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    DoesNotExist = models.Manager
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    title = models.CharField(max_length=256, verbose_name="title")
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    preambule = models.CharField(max_length=1024, verbose_name=_("preambule"))
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    body = models.TextField(blank=True, null=True, verbose_name=_("body"))
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    body_as_markdown = models.BooleanField(default=False, verbose_name=_("as markdown"))
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    def __str__(self) -> str:
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        return f"{self.pk} {self.title}"
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    class Meta:
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        ordering = ("-created_at", "-updated_at")
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        verbose_name = "новость"
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        verbose_name_plural = "новости"
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class Courses(BaseModel):
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    name = models.CharField(max_length=256, verbose_name=_("name"))
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    description = models.TextField(verbose_name=_("description"), **NULLABLE)
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    description_as_markdown = models.BooleanField(verbose_name=_("as markdown"), default=False)
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    cost = models.DecimalField(max_digits=8, decimal_places=2, verbose_name=_("cost"), default=0)
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    cover = models.CharField(max_length=25, default="no_image.svg", verbose_name=_("cover"))
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    def __str__(self) -> str:
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        return f"{self.pk} {self.name}"
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    class Meta:
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        verbose_name = "курс"
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        verbose_name_plural = "курсы"
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class Lesson(BaseModel):
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    course = models.ForeignKey(Courses, on_delete=models.CASCADE, **NULLABLE)
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    num = models.PositiveIntegerField(verbose_name=_("lesson number"))
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    title = models.CharField(max_length=256, verbose_name="Name")
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    description = models.TextField(verbose_name=_("description"), **NULLABLE)
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    description_as_markdown = models.BooleanField(verbose_name=_("as markdown"), default=False)
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    def __str__(self) -> str:
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        return f"{self.course.name} | {self.num} | {self.title}"
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    class Meta:
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        ordering = ("course", "num")
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        verbose_name = "урок"
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        verbose_name_plural = "уроки"
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class CourseTeachers(BaseModel):
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    course = models.ManyToManyField(Courses)
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    name_first = models.CharField(max_length=128, verbose_name=_("name"))
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    name_second = models.CharField(max_length=128, verbose_name=_("surname"))
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    day_birth = models.DateField(verbose_name=_("day_birth"))
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    def __str__(self) -> str:
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        return f"{self.pk} {self.name_second} {self.name_first}"
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    class Meta:
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        verbose_name = "CourseTeacher"
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class CourseFeedback(BaseModel):
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    RAITING_FIVE = 5
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    RAITING_FOUR = 4
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    RAITING_THREE = 3
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    RAITING_TWO = 2
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    RAITING_ONE = 1
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    RATINGS = (
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        (RAITING_FIVE, '⭐⭐⭐⭐⭐'),
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        (RAITING_FOUR, '⭐⭐⭐⭐'),
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        (RAITING_THREE, '⭐⭐⭐'),
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        (RAITING_TWO, '⭐⭐'),
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        (RAITING_ONE, '⭐'),
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    )
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    course = models.ForeignKey(Courses, on_delete=models.CASCADE, verbose_name=_('course'))
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    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, verbose_name=_('user'))
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    feedback = models.TextField(verbose_name='Отзыв', default=_('empty'))
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    rating = models.PositiveSmallIntegerField(choices=RATINGS, default=RAITING_FIVE, verbose_name=_('rating'))
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    class Meta:
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        verbose_name = 'Рейтинг'
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        verbose_name_plural = 'Рейтинги'
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    def __str__(self):
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        return f'Отзыв о курсе {self.course} от {self.user} '
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