from django.db import models
from django.utils.translation import ugettext_lazy as _

from counter.models import Counter

class Stock(models.Model):
	""" The Stock class, this one is used to know how many products are left for a specific counter """
	name = models.CharField(_('name'), max_length=64)
	counter = models.OneToOneField(Counter, verbose_name=_('counter'), related_name='stock')

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

class StockItem(models.Model):
	""" The StockItem class, element of the stock """
	name = models.CharField(_('name'), max_length=64)
	unit_quantity = models.IntegerField(_('unit quantity'), default=0)
	effective_quantity = models.IntegerField(_('effective quantity'), default=0)
	stock_owner = models.ForeignKey(Stock, related_name="stock_owner")

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