def get_cost_info(request):
validate_request(
request, ["GET"], ["start_date", "n_subjects", "registration_discount"]
)
start_date = parse_start_date_or_error(request)
n_subjects = parse_n_subjects_or_error(request)
registration_discount = Decimal(request.GET["registration_discount"])
registration_base_cost = models.RegistrationCost.get_cost_for(start_date)
registration_cost = float(
(100 - registration_discount) * registration_base_cost / 100
)
monthly_cost = models.MonthlyCost.get_cost_for(start_date)
response = {
"monthly_cost": monthly_cost,
"registration_cost": registration_cost,
"prorated_cost": utils.prorated_cost(start_date, monthly_cost),
"total_cost": utils.total_cost(
start_date, monthly_cost, registration_cost, n_subjects
),
}
return JsonResponse(response)
def prorated_first_month_cost(self):
"""
Returns the prorated cost for the first month.
The prorated cost is defined relative to the starting date as such:
floor((PDL / TPD) * C)
where
PDL = Primary Days Left in Month
TPD = Total Primary Days in Month
C = Monthly Cost
TODO: I bet that enum refactor will make this nicer
"""
return utils.prorated_cost(self.start_date, self.monthly_cost)
def test_prorated_cost_ex4():
start_date = date(2017, 10, 7)
monthly_cost = 115
assert 102 == utils.prorated_cost(start_date, monthly_cost)
def test_prorated_cost_ex3():
start_date = date(2017, 11, 28)
monthly_cost = 115
assert 14 == utils.prorated_cost(start_date, monthly_cost)
def test_prorated_cost_ex2():
start_date = date(2017, 12, 12)
monthly_cost = 115
assert 77 == utils.prorated_cost(start_date, monthly_cost)
def test_prorated_cost_ex1():
start_date = date(2017, 11, 11)
monthly_cost = 115
assert 86 == utils.prorated_cost(start_date, monthly_cost)