from datetime import datetime

from django.core.exceptions import ValidationError
from django.db import models
from django.templatetags.static import static
from django.urls import reverse
from django.utils.text import slugify

from gallery.models.location import Location


class Album(models.Model):
    name = models.CharField(max_length=150, unique=True, verbose_name="Album")
    slug = models.SlugField(max_length=150, unique=True, verbose_name="Slug")
    location = models.ForeignKey(Location, blank=True, null=True, on_delete=models.SET_NULL, related_name='albums', verbose_name="Location")
    album_date = models.DateField(default=datetime.now, verbose_name="Album Date")
    cover = models.ForeignKey("Photo", blank=True, null=True, on_delete=models.SET_NULL, related_name='cover_to', verbose_name="Album cover")
    is_public = models.BooleanField(default=False, verbose_name="Published")

    @property
    def photos_in_album(self):
        return self.photos.count()

    @property
    def photos_views(self):
        total_views = sum(self.photos.views())
        return total_views

    @property
    def cover_url(self):
        if self.cover:
            return self.cover.photo_md.url
        random_cover = self.photos.order_by('-width').first()
        if random_cover:
            return random_cover.photo_md.url
        return static('img/placeholder.png')

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super(Album, self).save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse('gallery:album_url', kwargs={'album_slug': self.slug})

    class Meta:
        verbose_name_plural = "Albums"
        ordering = ('album_date',)

    def __str__(self):
        return '{}'.format(self.name)