153 lines
4.8 KiB
Python
153 lines
4.8 KiB
Python
import sys
|
|
|
|
from django.utils.translation import ugettext_lazy as _
|
|
|
|
from orchestra.utils.python import AttrDict
|
|
|
|
|
|
def _compute(rates, metric):
|
|
value = 0
|
|
num = len(rates)
|
|
accumulated = 0
|
|
barrier = 1
|
|
next_barrier = None
|
|
end = False
|
|
ix = 0
|
|
steps = []
|
|
while ix < num and not end:
|
|
fold = 1
|
|
# Multiple contractions
|
|
while ix < num-1 and rates[ix] == rates[ix+1]:
|
|
ix += 1
|
|
fold += 1
|
|
if ix+1 == num:
|
|
quantity = metric - accumulated
|
|
next_barrier = quantity
|
|
else:
|
|
quantity = rates[ix+1].quantity - rates[ix].quantity
|
|
next_barrier = quantity
|
|
if rates[ix+1].price > rates[ix].price:
|
|
quantity *= fold
|
|
if accumulated+quantity > metric:
|
|
quantity = metric - accumulated
|
|
end = True
|
|
price = rates[ix].price
|
|
steps.append(AttrDict(**{
|
|
'quantity': quantity,
|
|
'price': price,
|
|
'barrier': barrier,
|
|
}))
|
|
accumulated += quantity
|
|
barrier += next_barrier
|
|
value += quantity*price
|
|
ix += 1
|
|
return value, steps
|
|
|
|
|
|
def _prepend_missing(rates):
|
|
"""
|
|
Support for incomplete rates
|
|
When first rate (quantity=5, price=10) defaults to nominal_price
|
|
"""
|
|
if rates:
|
|
first = rates[0]
|
|
if first.quantity == 0:
|
|
first.quantity = 1
|
|
elif first.quantity > 1:
|
|
if not isinstance(rates, list):
|
|
rates = list(rates)
|
|
service = first.service
|
|
rate_class = type(first)
|
|
rates.insert(0,
|
|
rate_class(service=service, plan=first.plan, quantity=1, price=service.nominal_price)
|
|
)
|
|
return rates
|
|
|
|
|
|
def step_price(rates, metric):
|
|
# Step price
|
|
group = []
|
|
minimal = (sys.maxsize, [])
|
|
for plan, rates in rates.group_by('plan').items():
|
|
rates = _prepend_missing(rates)
|
|
value, steps = _compute(rates, metric)
|
|
if plan.is_combinable:
|
|
group.append(steps)
|
|
else:
|
|
minimal = min(minimal, (value, steps), key=lambda v: v[0])
|
|
if len(group) == 1:
|
|
value, steps = _compute(rates, metric)
|
|
minimal = min(minimal, (value, steps), key=lambda v: v[0])
|
|
elif len(group) > 1:
|
|
# Merge
|
|
steps = []
|
|
for rates in group:
|
|
steps += rates
|
|
steps.sort(key=lambda s: s.price)
|
|
result = []
|
|
counter = 0
|
|
value = 0
|
|
ix = 0
|
|
targets = []
|
|
while counter < metric:
|
|
barrier = steps[ix].barrier
|
|
if barrier <= counter+1:
|
|
price = steps[ix].price
|
|
quantity = steps[ix].quantity
|
|
if quantity + counter > metric:
|
|
quantity = metric - counter
|
|
else:
|
|
for target in targets:
|
|
if counter + quantity >= target:
|
|
quantity = (counter+quantity+1) - target
|
|
steps[ix].quantity -= quantity
|
|
if not steps[ix].quantity:
|
|
steps.pop(ix)
|
|
break
|
|
else:
|
|
steps.pop(ix)
|
|
counter += quantity
|
|
value += quantity*price
|
|
if result and result[-1].price == price:
|
|
result[-1].quantity += quantity
|
|
else:
|
|
result.append(AttrDict(quantity=quantity, price=price))
|
|
ix = 0
|
|
targets = []
|
|
else:
|
|
targets.append(barrier)
|
|
ix += 1
|
|
minimal = min(minimal, (value, result), key=lambda v: v[0])
|
|
return minimal[1]
|
|
step_price.verbose_name = _("Step price")
|
|
step_price.help_text = _("All price rates with a lower metric are applied.")
|
|
|
|
|
|
def match_price(rates, metric):
|
|
candidates = []
|
|
selected = False
|
|
prev = None
|
|
rates = _prepend_missing(rates.distinct())
|
|
for rate in rates:
|
|
if prev:
|
|
if prev.plan != rate.plan:
|
|
if not selected and prev.quantity <= metric:
|
|
candidates.append(prev)
|
|
selected = False
|
|
if not selected and rate.quantity > metric:
|
|
if prev.quantity <= metric:
|
|
candidates.append(prev)
|
|
selected = True
|
|
prev = rate
|
|
if not selected and prev.quantity <= metric:
|
|
candidates.append(prev)
|
|
candidates.sort(key=lambda r: r.price)
|
|
if candidates:
|
|
return [AttrDict(**{
|
|
'quantity': metric,
|
|
'price': candidates[0].price,
|
|
})]
|
|
return None
|
|
match_price.verbose_name = _("Match price")
|
|
match_price.help_text = _("Only the rate with inmediate inferior metric is applied.")
|