from decimal import Decimal as D
import datetime

from django.conf import settings
from django.utils import unittest
from django.core.exceptions import ValidationError

from oscar.apps.product.models import Item, ItemClass
from oscar.apps.partner.models import Partner, StockRecord
from oscar.test.helpers import create_product


class DummyWrapper(object):
    
    def availability(self, stockrecord):
        return 'Dummy response'
    
    def dispatch_date(self, stockrecord):
        return "Another dummy response"


class StockRecordTests(unittest.TestCase):

    def setUp(self):
        self.product = create_product(price=D('10.00'))
   
    def test_get_price_incl_tax_defaults_to_no_tax(self):
        self.assertEquals(D('10.00'), self.product.stockrecord.price_incl_tax)
        
    def test_get_price_excl_tax_returns_correct_value(self):
        self.assertEquals(D('10.00'), self.product.stockrecord.price_excl_tax)


class DefaultWrapperTests(unittest.TestCase):
    
    def test_default_wrapper_for_in_stock(self):
        product = create_product(price=D('10.00'), partner="Acme", num_in_stock=10)  
        self.assertEquals("In stock (10 available)", product.stockrecord.availability)
        
    def test_default_wrapper_for_out_of_stock(self):
        product = create_product(price=D('10.00'), partner="Acme", num_in_stock=0)  
        self.assertEquals("Out of stock", product.stockrecord.availability)
        
    def test_dispatch_date_for_in_stock(self):
        product = create_product(price=D('10.00'), partner="Acme", num_in_stock=1)  
        tomorrow = datetime.date.today() + datetime.timedelta(days=1)    
        self.assertEquals(tomorrow, product.stockrecord.dispatch_date)
    
    def test_dispatch_date_for_out_of_stock(self):
        product = create_product(price=D('10.00'), partner="Acme", num_in_stock=0)  
        date = datetime.date.today() + datetime.timedelta(days=7)
        self.assertEquals(date, product.stockrecord.dispatch_date)
    
    
class CustomWrapperTests(unittest.TestCase):    

    def setUp(self):
        self._old_setting = settings.OSCAR_PARTNER_WRAPPERS
        settings.OSCAR_PARTNER_WRAPPERS = {
            'Acme': 'oscar.apps.partner.tests.DummyWrapper'                                
        }
        
    def tearDown(self):
        settings.OSCAR_PARTNER_WRAPPERS = self._old_setting

    def test_wrapper_availability_gets_called(self):
        product = create_product(price=D('10.00'), partner="Acme", num_in_stock=10)  
        self.assertEquals("Dummy response", product.stockrecord.availability)
        
    def test_wrapper_dispatch_date_gets_called(self):
        product = create_product(price=D('10.00'), partner="Acme", num_in_stock=10)  
        self.assertEquals("Another dummy response", product.stockrecord.dispatch_date)