package edu.westga.Solution.lab6.model;

/**
* Class to perform useful calculations involving money.
*
* @author
* @date
*
*/
public class FinancialCalc {

/**
* Creates a Financial Calculator object.
*
* @precondition none
* @postcondition none
*/
public FinancialCalc() {

}

/**
* Determines the number of each coin needed to make the given number of cents.
*
* The return value is formatted as <# of quarters>Q<# of dimes>D<# of nickels>N<# of pennies>P.
*
* Example: if numberOfCents is 68, then that is:
*
* 2 quarters (50 cents)
* 1 dime (+10 cents)
* 1 nickel (+5 cents)
* 3 pennies (+3 cents, for a total of 78 cents)
*
* which gives a return String of "2Q1D1N3P"
*
* The number of quarters is calculated first, then the dimes, then nickels, then pennies.
*
* @precondition numberOfCents >= 0
* @postcondition none
*
* @param numberOfCents the number of cents to calculate
* @return the coins to return, in the format specified above
*/
public String findCoins(int numberOfCents) {

// Precondition enforcement
if (numberOfCents < 0)
throw new IllegalArgumentException();

int numQuarters = numberOfCents / 25;
int remainder = numberOfCents % 25;
int numDimes = remainder / 10;
remainder = remainder % 10;
int numNickels = remainder / 5;
int numPennies = remainder % 5;
return numQuarters + "Q" + numDimes + "D" + numNickels + "N" + numPennies + "P";
}

/**
* Splits a restaurant bill evenly among several diners.
*
* @precondition: amount > 0 && tipRate >= 0 && numDiners >= 1
* @postcondition: none
*
* @param amount the pre-tax amount of the bill
* @param tipRate the tip rate to be applied to the bill, as a percentage (e.g., 20.0 for 20% tip, 15.0 for 15% tip, etc)
* @param numDiners the number of people splitting the bill
* @return the amount of money each diner must pay
*/
public double splitRestaurantBill(double amount, double tipRate, int numDiners) {

// Precondition enforcement
if (amount <= 0 || tipRate < 0 || numDiners < 1)
throw new IllegalArgumentException();

double totalBill = amount * (1 + (tipRate / 100));
double fairShare = totalBill / numDiners;
return fairShare;
}

/**
* Calculates monthly take-home pay given an annual salary and a tax rate.
*
* @precondition yearlySalary > 0 && 0 <= taxRate <= 1
*
* @param yearlySalary an annual salary
* @param taxRate tax rate, expressed as a number between 0 and 1 (i.e., a 25% tax rate would be 0.25)
* @return take-home pay for one month
*/
public double calculateMonthlyTakehomePay(double yearlySalary, double taxRate) {

// Precondition enforcement
if (yearlySalary <= 0 || taxRate < 0 || taxRate > 1)
throw new IllegalArgumentException();

double tax

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