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#!/bin/env python3
# cost should be given in cents
def tanken(drives, cost, service_charge=0):
passengers = {}
distance = 0.
drives = [d.split(' ') for d in drives]
for d in drives:
try:
d[0] = int(d[0])
except:
return None, "Lines have to start with the driven distance!"
# calculate overall distance
distance += d[0]
# collect distances per passenger
for p in d[1:]:
if p not in passengers:
passengers[p] = {
"distance": d[0],
"cost": 0,
"service_charge": 0
}
else:
passengers[p]["distance"] += d[0]
# calculate cost per kilometer
if distance <= 0:
return None, "Driven distance must be greater than 0!"
c = cost / distance
for d in drives:
# calculate cost per drive split among passengers
c_d = int(c * d[0] / (len(d) - 1))
for p in d[1:]:
passengers[p]["cost"] += c_d
# calculate service charge per drive split among passengers
sc_d = int(service_charge * d[0] / (len(d) - 1))
for p in d[1:]:
passengers[p]["service_charge"] += sc_d
return passengers, None
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