from django.db import models
from django.conf import settings

class Album(models.Model):
    name = models.CharField(max_length=120)
    caption = models.TextField(blank=True, null=True)
    slug = models.SlugField()

    def get_main_image(self):
        try:
            main_photo = Photo.objects.filter(album=self).order_by('order','image')[0]
            return main_photo.image
        except:
            return None

    def __unicode__(self):
        return "%s" %(self.name,)

def get_upload_path(photo, filename):
    if photo.album:
        return "photos/%s/%s" %(photo.album.slug, filename)
    else:
        return "photos/%s" %(filename)

class Photo(models.Model):
    image = models.ImageField(upload_to=get_upload_path, null=True)
    caption = models.TextField(blank=True, null=True)
    order = models.IntegerField(blank=True, null=True)
    album = models.ForeignKey('Album', on_delete=models.CASCADE)

    def __unicode__(self):
        return "%s" %(self.image)