from django.contrib.auth.models import User
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from datetime import datetime

class Product(models.Model):

	def __unicode__(self):
		return self.name

	name = models.CharField(max_length=64)
	sale_price_int = models.FloatField()
	sale_price_ext = models.FloatField()
	description = models.CharField(max_length=256, blank=True)
	volume_liter = models.FloatField(null=True)
	alcohol_percent = models.FloatField(null=True)
	image = models.ImageField(upload_to='products', blank=True)
	customer_support = models.CharField(max_length=32, blank=True)
	active = models.BooleanField(default=True)
	created = models.DateTimeField(auto_now_add=True)
	updated = models.DateTimeField(auto_now=True)

class Order(models.Model):
	customer = models.ForeignKey(User)
	order_sum = models.FloatField(db_column='sum')
	created = models.DateTimeField(auto_now_add=True)

	def __unicode__(self):
		return "{0}: {1} kr".format(self.customer, self.order_sum)

class OrderLine(models.Model):
	order = models.ForeignKey(Order)
	product = models.ForeignKey(Product)
	amount = models.IntegerField()
	unit_price = models.FloatField()

	def __unicode__(self):
		return "{1} {0} ({2} kr per)".format(self.product, self.amount, self.unit_price)

	class Meta:
		unique_together = ('order', 'product')

class Transaction(models.Model):
	user = models.ForeignKey(User)
	amount = models.FloatField()
	created = models.DateTimeField(auto_now_add=True)

	def __unicode__(self):
		return "{0}: {1}: {2}".format(self.id, self.user, self.amount)

class UserProfile(models.Model):
	user = models.OneToOneField(User)
	balance = models.FloatField(default=0.0)
	image = models.ImageField(upload_to='users', blank=True)

        def last_purchase(self):
            if len(self.user.order_set.all()) == 0:
                return None
            return self.user.order_set.order_by('created').reverse()[0]

        def last_purchase_date(self):
            last = self.last_purchase()
            if last:
                return last.created
            else:
                return datetime.min

	def __unicode__(self):
		return "{0}".format(self.user)

# Create a new UserProfile object when we create a new User.
@receiver(post_save, sender=User, dispatch_uid='randomz')
def create_user_profile(sender, instance, created, **kwargs):
	if created:
		UserProfile.objects.create(user=instance)