/*
   asst02.cpp
   CIS 150
   06/09/05
   David Klick
   
   Solution to programming assignment #2
*/

#include <iostream>
#include <iomanip>
using std::cout;
using std::cin;
using std::fixed;
using std::setw;
using std::showpoint;
using std::setprecision;
using std::endl;

const double TAXRATE = .075;

int main(void) {
   char choice;
   int qty = 0;
   double disc = 0.0;
   double discAmt = 0.0;
   double subtotal = 0.0;
   double tax = 0.0;
   double total = 0.0;
   bool valid = true;  // assume user entry will be valid
   bool done = false;  // assume not done
   double pricePer = 0.0;

   // display menu
   cout << "Choose item for purchase:\n\n"
           "  1. (P)rinter - Laserjet 2550n ($699)\n\n"
           "  2. (L)aptop computer - Winbook C540 ($1099.95)\n\n"
           "  3. (D)esktop computer - Powerspec 1550 ($395.50)\n\n"
           "  4. (Q)uit\n\n"
           "Please enter choice: ";
   cin >> choice;

   // process manu selection
   switch (choice) {
   case '1':
   case 'P':
   case 'p':
      pricePer = 699.00;
      break;
   case '2':
   case 'L':
   case 'l':
      pricePer = 1099.95;
      break;
   case '3':
   case 'D':
   case 'd':
      pricePer = 395.50;
      break;
   case '4':
   case 'Q':
   case 'q':
      done = true;
      break;
   default:
      cout << choice << " is not a valid choice\n";
      valid = false;
   }
   
   // get quantity and validate it (only if not done and no error so far)
   if (valid && !done) {
      cout << "\nEnter quantity desired (0-999): ";
      cin >> qty;
      if (qty<0 || qty>999) {
         cout << qty << " is not a valid quantity\n";
         valid = false;
      } else {
         if (qty < 12) disc = 0.0;
         else if (qty < 100) disc = 0.10;
         else disc = 0.20;
      }
   }

   // calculate and display output (only if not done and no error so far)
   if (valid && !done) {
      subtotal = pricePer * qty;
      discAmt = subtotal * disc;
      tax = TAXRATE * (subtotal-discAmt);
      total = subtotal - discAmt + tax;
      cout << fixed << showpoint << setprecision(2) << "\n\n"
           << "   Price: " << setw(10) << pricePer << "\n"
           << "Quantity: " << setw(7) << qty << "\n"
           << "Subtotal: " << setw(10) << subtotal << "\n"
           << "Discount: " << setw(10) << discAmt << "\n"
           << "     Tax: " << setw(10) << tax << "\n"
           << "   Total: " << setw(10) << total << endl;
   }   

   return 0;
}