from django.core.validators import MinValueValidator, MaxValueValidator
from django.conf import settings
from django.db import models
from PIL import Image


class Ticket(models.Model):
    # Your Ticket model definition goes here
    title = models.CharField("Titre", max_length=100)
    desc = models.CharField("Description", max_length=8192)
    user = models.ForeignKey(
        to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    image = models.ImageField()
    time_created = models.DateTimeField(auto_now_add=True)
    review = models.ForeignKey(to='reviews.Review',
                               on_delete=models.SET_NULL,
                               related_name='has_review',
                               null=True)

    IMAGE_SIZE = (400, 400)

    def resize_image(self):
        image = Image.open(self.image)
        image.thumbnail(self.IMAGE_SIZE)
        image.save(self.image.path)

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        self.resize_image()


class Review(models.Model):
    ticket = models.ForeignKey(to=Ticket,
                               on_delete=models.CASCADE,
                               related_name='of_ticket',
                               null=True)
    rating = models.PositiveSmallIntegerField(
        # validates that rating must be between 0 and 5
        validators=[MinValueValidator(0), MaxValueValidator(5)])
    headline = models.CharField("titre", max_length=128)
    comment = models.CharField("commentaire",
                               max_length=8192,
                               blank=True)
    user = models.ForeignKey(to=settings.AUTH_USER_MODEL,
                             on_delete=models.CASCADE)
    time_created = models.DateTimeField(auto_now_add=True)


class UserFollows(models.Model):
    # Your UserFollows model definition goes here
    user = models.ForeignKey(to=settings.AUTH_USER_MODEL,
                             on_delete=models.CASCADE,
                             related_name="following",
                             null=True)
    followed_user = models.ForeignKey(to=settings.AUTH_USER_MODEL,
                                      on_delete=models.CASCADE,
                                      related_name="followed",
                                      null=True)
    starting_date = models.DateTimeField(auto_now_add=True)

    class Meta:
        # ensures we don't get multiple UserFollows instances
        # for unique user-user_followed pairs
        unique_together = ('user', 'followed_user', )

    def __str__(self):
        return f'{self.user} -> {self.followed_user}'