private Dollars Charge(int usage)
{
Dollars result;
if (usage == 0) return new Dollars(0);
double t1 = START_RATE - ((END_RATE*END_AMOUNT) - START_RATE)/(END_AMOUNT - 1);
double t2 = ((END_RATE*END_AMOUNT) - START_RATE)*Math.Min(END_AMOUNT, usage)/
(END_AMOUNT - 1);
double t3 = Math.Max(usage - END_AMOUNT, 0)*END_RATE;
result = new Dollars(t1 + t2 + t3);
result = result.Plus(new Dollars(usage*0.0175));
Dollars base1 = new Dollars(result.Min(new Dollars(50)).Times(0.07));
if (result.IsGreaterThan(new Dollars(50)))
{
base1 = new Dollars(base1.Plus(result.Min(new Dollars(75)).Minus(
new Dollars(50)).Times(0.06)
));
}
if (result.IsGreaterThan(new Dollars(75)))
{
base1 = new Dollars(base1.Plus(result.Minus(new Dollars(75)).Times(0.05)));
}
result = result.Plus(base1);
return result;
}
private Dollars Charge(int usage)
{
double base1 = Math.Min(usage, 100)*0.03;
if (usage > 100)
{
base1 += (Math.Min(usage, 200) - 100)*0.05;
}
if (usage > 200)
{
base1 += (usage - 200)*0.07;
}
Dollars result = new Dollars(base1);
Dollars tax = new Dollars(result.Minus(new Dollars(8)).Max(new Dollars(0)).Times(TAX_RATE));
result = result.Plus(tax);
Dollars fuelCharge = new Dollars(usage*0.0175);
result = result.Plus(fuelCharge);
return result.Plus(new Dollars(fuelCharge.Times(TAX_RATE)));
}
private Dollars Charge(int usage, DateTime start, DateTime end)
{
Dollars result;
double summerFraction;
// Find out how much of period is in the summer
if (start.After(zone.SummerEnd()) || end.Before(zone.SummerStart()))
summerFraction = 0;
else if (!start.Before(zone.SummerStart()) && !start.After(zone.SummerEnd()) && !end.Before(zone.SummerStart()) && !end.After(zone.SummerEnd()))
{
summerFraction = 1;
}
else
{
// part in summer part in winter
double summerDays;
if (start.Before(zone.SummerStart()) || start.After(zone.SummerEnd()))
{
// end is in the summer
summerDays = DayOfYear(end) - DayOfYear(zone.SummerStart()) + 1;
}
else
{
// start is in summer
summerDays = DayOfYear(zone.SummerEnd()) - DayOfYear(start) + 1;
}
summerFraction = summerDays/(DayOfYear(end) - DayOfYear(start) + 1);
}
result = new Dollars((usage*zone.SummerRate()*summerFraction) + (usage*zone.WinterRate()*(1 - summerFraction)));
result = result.Plus(new Dollars(result.Times(TAX_RATE)));
Dollars fuel = new Dollars(usage*0.0175);
result = result.Plus(fuel);
result = new Dollars(result.Plus(fuel.Times(TAX_RATE)));
return result;
}
private Dollars Charge(int fullUsage, DateTime start, DateTime end)
{
Dollars result;
double summerFraction;
int usage = Math.Min(fullUsage, CAP);
if (start.After(zone.SummerEnd()) || end.Before(zone.SummerStart()))
summerFraction = 0;
else if (!start.Before(zone.SummerStart()) && !start.After(zone.SummerEnd()) &&
!end.Before(zone.SummerStart()) && !end.After(zone.SummerEnd()))
summerFraction = 1;
else
{
double summerDays;
if (start.Before(zone.SummerStart()) || start.After(zone.SummerEnd()))
{
// end is in the summer
summerDays = DayOfYear(end) - DayOfYear(zone.SummerStart()) + 1;
}
else
{
// start is in summer
summerDays = DayOfYear(zone.SummerEnd()) - DayOfYear(start) + 1;
}
;
summerFraction = summerDays/(DayOfYear(end) - DayOfYear(start) + 1);
}
result = new Dollars((usage*zone.SummerRate()*summerFraction) +
(usage*zone.WinterRate()*(1 - summerFraction)));
result = result.Plus(new Dollars(Math.Max(fullUsage - usage, 0)*0.062));
result = result.Plus(new Dollars(result.Times(TAX_RATE)));
Dollars fuel = new Dollars(fullUsage*0.0175);
result = result.Plus(fuel);
result = new Dollars(result.Plus(fuel.Times(TAX_RATE).Min(FUEL_TAX_CAP)));
return result;
}