//This is a modification of the textbook health club examples
//that calculate dues for members in three different categories.
//It illustrates breaking a program into functions that each perform
//specific tasks.

#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;

int displayMenuandChoose();
double processMenuChoice( int choice);
double calculateDues(int months, double rate );
void printDues(double charges);
void printDuesInfotoFile( ofstream &fout, int choice, double charges);

// Global Constants for menu choices
   const int ADULT_CHOICE = 1,
             CHILD_CHOICE = 2,
             SENIOR_CHOICE = 3,
             QUIT_CHOICE = 4;

// Global Constants for membership rates
   const double ADULT = 40.0,
                CHILD = 20.0,
                SENIOR = 30.0;

int main()
{
   int choice;       // Menu choice
   double charges;   // Monthly charges
   ofstream fout;
   fout.open("CLUBDUESINFO.TXT");
   do
   {
      choice = displayMenuandChoose();
      charges = processMenuChoice(choice);
      if ( charges > 0)
      {
          printDues(charges);
          printDuesInfotoFile(fout, choice, charges);
      }
   } while (choice !=QUIT_CHOICE);
   fout.close();
   return 0;
}
int displayMenuandChoose()
{
      int choice;
// Display the menu.
      cout << "\n\t\tHealth Club Membership Menu\n\n"
           << "1. Standard Adult Membership\n"
           << "2. Child Membership\n"
           << "3. Senior Citizen Membership\n"
           << "4. Quit the Program\n\n"
           << "Enter your choice: ";
      cin >> choice;
      return choice;
}  //end displayMenuandChoose()























//Function processes user's menu entry and validates entry
//Calls a computation function that assesses monthly dues and returns those dues.
//As written, function cannot return the number of months of membership
double processMenuChoice( int choice)
{
         int months;
         double dues;
         switch (choice)
         {
            case ADULT_CHOICE:
                cout << "For how many months? ";
                cin >> months;
                while (months < 3)
                {
                    cout << "Sorry, but you must join for at least 3 months\n";
                    cout << "Try again \n";
                    cin >> months;
                }
                dues = calculateDues(months, ADULT);
                break;
            case CHILD_CHOICE:
                cout << "For how many months? ";
                cin >> months;
                while(months < 3)
                {
                    cout << "Sorry, but you must join for at least 3 months\n";
                    cout << "Try again \n";
                    cin >> months;
                }
                dues = calculateDues(months, CHILD);
                break;
            case SENIOR_CHOICE:
                cout << "For how many months? ";
                cin >> months;
                while (months < 6)
                {
                    cout << "Sorry, but you must join for at least 6 months\n";
                    cout << "Try again \n";
                     cin >> months;
                }
                dues = calculateDues(months, SENIOR);
                break;
            default:
                cout << "You did not enter a valid menu choice \n";
                dues = 0;
                break;
         } //end switch
         return dues;
}  //end Process menu choice

//Based on months of membership functions calculates dues
//this function could well be more complex and use more parameters
//to determine dues
//for example, you might have a discounted rate or a special offering rate
//for a personal trainer depending on member classification
double calculateDues(int months, double rate )
{
    double dues;
    dues = months*rate;
    cout << "Months are "  << months << endl;
    cout << "Dues in calculateDues are " << dues << endl;
    return dues;
}

//simple screen display function
void printDues(double charges)
{
    cout << fixed << showpoint << setprecision(2);
    cout << "The total charges are $" << charges << endl;
}

//This function is a stub
void printDuesInfotoFile(ofstream &fout, int choice, double charges)
{
  cout << "I am in PrintDuesInfotoFile \n";
}