from datetime import datetime
from os.path import basename, join
from uuid import uuid4

from django.db import models


def change_upload_path(instance, filename):
    ext = filename.split('.')[-1]
    now = datetime.now()
    return join(str(now.year), str(now.month),
                f'{uuid4()}.{ext}')


class Post(models.Model):
    message = models.CharField('Nachricht', max_length=4096)
    posted = models.BooleanField('Gepostet', default=False)
    publication_date = models.DateTimeField('Publizieren am')

    class Meta():
        verbose_name = 'Post'

    def __str__(self):
        date = self.publication_date.strftime('%d.%m.%Y %H:%M')
        return f'{date}: {self.message[0:50]}'


class Image(models.Model):
    path = models.ImageField('Bild', upload_to=change_upload_path,
                             default=None)
    caption = models.CharField('Beschreibung', max_length=2048)

    post = models.ForeignKey(Post, on_delete=models.CASCADE, default=None)

    class Meta():
        verbose_name = 'Bild'
        verbose_name_plural = 'Bilder'

    def __str__(self):
        path = basename(str(self.path))
        return f'{path}: {self.caption[0:50]}'