/*
Raymond Ver
Professor Pape
raymond.c.ver@gmail.com
CIS 22A
20 October 2015
Lab 3 - Audio Visual Equipment
*/

#include <iostream>
#include <iomanip>
#include <stdlib.h>
#include <string>
#include <cctype>

using namespace std;

#define newreqPercent 0.9
#define oldreqPercent 0.65
#define newSugPercent 0.4
#define oldSugPercent 0.2
#define profitRatePercent 0.8

void signature()
{
    string position, email, labNum;
	position = "Student    :\t";
	email = "Email      :\t";
	labNum = "Lab Number :\t";
	cout << position + "Raymond Ver\n";
	cout << email + "raymond.c.ver@gmail.com\n";
	cout << labNum + "4\n\n";
}

double calcBooks(char, char, int);
double calcProfit( double, int);
void printOutput(string, int, double);

int main()
{
        //Declaration of Variables
        string isbn;
        double pricePerCopy;
        double profit;
        int classNumber;
        int copiesNeeded;
        char reqOrSug;
        char newOrOld;


        //Asking user for input
        cout << "Enter book number (10 digits):  ";
                cin >> isbn;
        cout << "Enter price per copy:           ";
                cin >> pricePerCopy;
        cout << "Enter expected class enrollment:";
                cin >> classNumber;
        cout << "Enter 'R' if required or 'S' if suggested:";
                cin >> reqOrSug;
        reqOrSug = toupper(reqOrSug);
        cout << "Enter 'N' if new or 'O' if not a new text:";
                cin >> newOrOld;
        newOrOld = toupper(newOrOld);

    //Print the number of books to be ordered
	copiesNeeded = static_cast<int>(calcBooks(reqOrSug, newOrOld, classNumber) + .5);

    //Print out the profit of the store after paying 80%
	profit = calcProfit(pricePerCopy, copiesNeeded);

	//Print out the 3 outputs
	printOutput(isbn, copiesNeeded, profit);


	cout << endl;
	signature();
	system("pause");
	return 0;
}
//end main
////////////////////////////////////////////

double calcBooks(char reqOrSug, char newOrOld, int classNumber)
{

double copiesNeeded;
	if (reqOrSug == 'R')
	{
		if (newOrOld == 'N')
		{
			copiesNeeded = newreqPercent * classNumber +.5;
		}
		else if (newOrOld == 'O')
		{
			copiesNeeded = oldreqPercent * classNumber;
		}
		else
		{
			cout << "\n\nError\n\n";
			system("pause");
			exit(42);
		}
	}
	else if (reqOrSug == 'S')
	{
		if (newOrOld == 'N')
		{
			copiesNeeded = newSugPercent * classNumber;
		}
		else if (newOrOld == 'O')
		{
			copiesNeeded = oldSugPercent * classNumber;
		}
		else
		{
			cout << "\n\nError\n\n";
			system("pause");
			exit(42);
		}
	}
	else
	{
		cout << "\n\nError\n\n";
		system("pause");
		exit (42);
	}

	return copiesNeeded;
}


double calcProfit(double pricePerCopy, int copiesNeeded)
{
    double profit;
    profit = (pricePerCopy * copiesNeeded) - ((pricePerCopy * copiesNeeded) * profitRatePercent);

    return profit;
}


void printOutput(string isbn, int copiesNeeded, double profit)
{
	cout << setprecision(2) << fixed;
	cout << endl;
	cout << endl;
	cout << "ISBN          :\t" << isbn << endl;
	cout << "Copies Needed :\t" << copiesNeeded << endl;
	cout << "Profit        :\t" << "$" << profit << endl;

	return;
}