// This program calculates the bill for a wedding invitation order
// given the particular prices of Pat's Invitation Emporium (PIE, Inc.).

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

int main(){

  // Define constants for set prices
  // Put them first so that we can find and change them easily
  const float small_card = 1.49, large_card = 1.79;
  const float small_backing = 0.39, large_backing = 0.49;
  const float two_inks = 0.75;
  const int minimum_order = 30;
  const float tax_rate = .0475;

  // Declare and initialize variables
  int number_of_cards = 0;
  float card_cost = 0, total_cost = 0, tax = 0, total_w_tax = 0;
  bool using_small_cards = true;
  bool using_backing_cards = false;
  bool using_two_inks = false;
  char card_size_letter, backing_input, color_input;

  //
  // Say what the program does
  //

  cout << "This is the PIE, Inc. Wedding Invitation cost calculator" << endl;
  cout << "Please enter the following information:" << endl << endl;


  //
  // Get some nice input from the user
  //

  // First, figure out what the card size is
  cout << "Enter S for small cards or L for large cards: ";
  cin >> card_size_letter;
  // Exit early if the letter isn't valid
  if ((card_size_letter != 's')&&(card_size_letter != 'S')&&
      (card_size_letter != 'l')&&(card_size_letter != 'L')){
    cout << "Invalid size letter. Please run the program again." << endl;
    exit (1);
  }
  // Now set it to large if needed
  if ((card_size_letter == 'l')||(card_size_letter == 'L')){
    using_small_cards = false;
  }

  // Second, see if there is a backing card
  cout << "Will there be a backing card (y/n)?: ";
  cin >> backing_input;
  if ((backing_input != 'y')&&(backing_input != 'Y')&&
      (backing_input != 'n')&&(backing_input != 'N')){
    cout << "Invalid entry. Please run the program again." << endl;
    exit (1);
  }
  // Now set the using_backing_card variable
  if ((backing_input == 'y')||(backing_input == 'Y')){
    using_backing_cards = true;
    cerr << "Backing cards set" << endl;
  }

  // Finally, check the number of inks
  cout << "Will there be a two ink colors (y/n)?: ";
  cin >> color_input;
  if ((color_input != 'y')&&(color_input != 'Y')&&
      (color_input != 'n')&&(color_input != 'N')){
    cout << "Invalid entry. Please run the program again." << endl;
    exit (1);
  }
  // Now set the using_two_inks variable
  if ((color_input == 'y')||(color_input == 'Y')){
    using_two_inks= true;
    cerr << "Color ink set" << endl;
  }
  
  // Ok, now check to make sure that the order size is sane and reasonable
  // 0ver 30 and a multiple of 10
  cout << "How many invitations are needed?: ";
  cin >> number_of_cards;
  if ((number_of_cards < 30)||((number_of_cards % 10) != 0)){
    cout << "The number of cards ordered must be at least 30," << endl;
    cout << "and a multiple of 10" << endl;
    exit(1);
  }

  // Now all the input is all in, do the calculations
  
  // First, the cost of the card
  if (using_small_cards){
    card_cost = card_cost + small_card;
  }
  else { // must be large cards
    card_cost = card_cost + large_card;
  }

  // Second, if there is a backing card
  // add the backing card costs
  if (using_backing_cards){
    if (using_small_cards){
      card_cost = card_cost + small_backing;
    }
    else { // must be large cards
      card_cost = card_cost + large_backing;
    }
  }

  // Third, if there are two ink colors add the cost in
  if (using_two_inks){
    card_cost = card_cost + two_inks;
  }

  cerr << "Card cost is: " << card_cost;

  // Compute the cost of all the cards
  total_cost = card_cost * number_of_cards;
  tax =  tax_rate * total_cost;
  total_w_tax = tax + total_cost;

  // Output the total cost neatly
  
  cout << fixed << setprecision(2) << endl << endl;
  cout << setw(25) << "Card cost subtotal: " << setw(6) << total_cost << endl
       << setw(25) << "Tax: " << setw(6) << tax << endl
       << setw(25) << "Total with tax: " << setw(6) << total_w_tax << endl;
  
  





  return 0;
}