//9.1 - The Mysterious Store - Mark Lee - Prima Publishing
#include <iostream>
#include <vector>
#include <string>

using namespace std;

#define MAX(a,b) a<b ? b: a //the common macro

struct Item //used to store a single item from the store.
{
     string name;
     int price;
};

class Store //used to handle everything to do with the store
{
     vector<Item> inventory;
     vector<Item> forSale;
     int money;
public:
     Store(Item* itemList, int n);
     
     ~Store() {}
     
     string BuyItem(int item); 
     
     string viewInventory();
     
     string ListItems();
     
     int getMoney()
     {
          return MAX(money,0);
     }
     
};

Store::Store(Item* itemList, int n)
{
          
     for(int i = 0; i < n; i++)
          forSale.push_back(itemList[i]);
     money = 20;
}

string Store::BuyItem(int item) 
{ 
     money -= forSale[item-1].price;
     if (money < 0)
          return "\nSorry, you don't have enough money.\n\n";
     inventory.push_back(forSale[item-1]);
     return "You bought a " + forSale[item-1].name + '\n';

}

string Store::ListItems()
{
     string s;
     for(int i = 0; i < forSale.size(); i++)
     {
          s += "["; 
          s += i + 49; 
          s+="]Buy a "; 
          s+= forSale[i].name;
          s+= " ($";
          s+= forSale[i].price + 48; 
          s+= ")\n";
     }
     return s;
}

string Store::viewInventory()
{
     string s;
     for(int i = 0; i < inventory.size(); i++)
          s += inventory[i].name + '\n';
     return s + '\n';
}

int main(void)
{
     int input;
     Item f[3];
     f[0].name = "Clown";
     f[0].price = 2;
     f[1].name = "Cracker Jack";
     f[1].price = 6;
     f[2].name = "Camel";
     f[2].price = 9;
     Store s = Store(f,3);
     while(true)
     {
          do {
               cout << "Welcome to the store.\n"
                    << "You have " << s.getMoney() 
                    << " dollars.\n"
                    << "\nWhat would you like to do?\n"
                    << s.ListItems()
                    << "[4]View your inventory\n"
                    << "[5]Leave\n";
               cin >> input;
          }while(input<1||input>5);
          switch(input)
          {
               case 4:
                    cout << s.viewInventory();
                    break;
               case 5:
                    goto END;
               default:
                    cout << s.BuyItem(input);
          }
     }
END: 
     cout << "See ya!";
     return 0;
}