/*********************************************************************
  C201 Computer Programming II
  Fall 2006
  Dana Vrajitoru &

  A class to represent the inventory of a shop.

**********************************************************************/

#ifndef INVENTORY_H
#define INVENTORY_H

#include "product.h"

const int SIZE_DEF = 10;

class Inventory {
 private:
  // size is the number of product objects currently used in the
  // inventory. capacity is the total number of product objects we can
  // use without having to increase the size of the array.
  int capacity, size;
  Product *items;
  
 public:
  // Constructors - Destructor

  // Constructor with specified size and default value so that we can
  // use it as default constructor too.
  Inventory(int nr_items = 0);
  
  // Destructor: must delete the array items if it's not NULL.
  ~Inventory();

  // Initialize, reset, resize functions.  

  // Initialize the array items with a given capacity. If the array is
  // not empty it must delete it. It does not copy the previous
  // objects in the array.
  void Init(int nr_items);
  // Delete the array items and reset all values to 0.
  void Clear();
  // Double the size of the array items and copy all the items from
  // the previous one to the new one.
  void Resize();

  // Stock manipulation.

  // Adds a new product to the inventory by inputing it from the user.
  void Add_new();
  // Increases the quantity of an existing item identified by its
  // name. If the name is not yet used it prints an error message and
  // returns false.
  bool Add_by_name();
  // Sells a quantity of an existing item identified by name. If there
  // is no item with that name or if the quantity of the item is less
  // than the required amount to sell then the function should print
  // an error message and return false. If the operation is successful
  // the function should output the total price for those items
  // (quantity sold times the price).
  bool Sell_by_name();
  
  // General purpose functions
  // Print a list of the entire inventory.
  void Output_all();
};

#endif