// SYSC 2002 Winter 2011 Assignment #3
#include "stdstuff.h"
#include "customerDB.h"

// global constant
const int MAXOPT=7;

// mainMenu returns an integer representing the menu option chosen
// Valid values are from 1 to "MAXOPT" (global constant).
int mainMenu(){
   int returnVal;
   for(;;){
      cout << endl;
      cout << "1: Add New Customer" << endl;
      cout << "2: Remove Existing Customer" << endl;
      cout << "3: Print Database Information" << endl;
      cout << "4: Change Existing Customer ID" << endl;
      cout << "5: Change Existing Customer Total" << endl;
      cout << "6: Find Best Customer Total" << endl;
      cout << "7: End Program\n\n"; // always use "max" for ending program
      cout << "Please enter the desired operation [1-" << MAXOPT << "]: ";
      cin >> returnVal;
      //return if valid option, otherwise output error message
      if(returnVal>=1&&returnVal<=MAXOPT)
         return returnVal;
      cout << "Please enter a valid integer option!" << endl;    ;
   }
}


// main program calls the functions most of which you need to write
int main(){
 
   int option;
   int id, newid;
   double total, newtotal, maxtotal;
   
   // the Customer database (no customers when we start) 
   customerDB ourDB;
   ourDB.numCusts=0;

   for(;;){
      option=mainMenu();
        
      if(option==MAXOPT) break; // end of program
        
      switch(option) {
         case 1: // add new customer
            cout << "Enter customer id and total: ";
            cin >> id >> total;
            if(addCustomer(id,total,ourDB))
               cout << "Customer added.  There are now: " << ourDB.numCusts << " customers in database.\n";
            else
               cout << "Customer could not be added: already in database or database full.\n";
            break;
              
         case 2: // remove existing Customer
            cout << "Enter customer id: ";
            cin >> id;
            if(removeCustomer(id,ourDB))
               cout << "Customer removed.  There are now: " << ourDB.numCusts << " Customers in database.\n";
            else
               cout << "Customer could not be removed: did not exist in database.\n";
            break;
              
         case 3: // print database information, one customer per line, with total to 2
                 // decimal places
            printCustomerDatabase(ourDB); 
            break;
              
         case 4: // change customer id
            cout << "Enter existing customer id, and new customer id: ";
            cin >> id >> newid;
            if(changeCustomerID(id,newid,ourDB))
               cout << "customer id successfully updated.\n";
            else
               cout << "Customer could not be updated: did not exist in database or new id in use.\n";
            break;
              
         case 5: // change Customer total
            cout << "Enter customer id, and new Customer total: ";
            cin >> id >> newtotal;
            if(changeCustomerTotal(id,newtotal,ourDB))
               cout << "Customer total successfully updated.\n";
            else
               cout << "Customer could not be updated: did not exist in database.\n";
            break;
              
         case 6: // find best customer total
            maxtotal = getBestCustomerTotal(ourDB);
            if(maxtotal==-1)
               cout << "No customers: database is empty.\n";
            else
               cout << "Best customer total is: " << maxtotal << ".\n";
            break;
              
         default: // should never get here
            break;
      }
        
   } 
       
   pause();
   return 0;
}