TransactionManager.h

// Blake Berry
// 03/08/2022
// Homework 4
// This file is an interface for the TransactionManager class. The 
//  TransactionManager stores customers and their purchase history for the 
// collectibles store. The transactionManager does not own the memory to the
// customer or the items in the transaction it simply logs and can provide
// hisotrical information about a csutomers or the stores transaction history
//-----------------------------------------------------------------------------

#pragma once
#include "SearchTree.h"
#include "Customer.h"
#include "Transaction.h"
#include "TransactionLogEntry.h"


class TransactionManager
{
private:

   // search tree filled with TransactionLogEntry items
   SearchTree* transactionHistory_;

public:

   //-------------------------- TransactionManager ----------------------------
   // creates a transaction manager that is empty of transaction to manage
   // Postconditions: creates a transaction manager that is empty of 
   //                 transactions
   TransactionManager();


   //------------------------- Destructor ----------------------------
   // Frees the transactionHistory tree of its nodes
   // Preconditions : Assumes that the collectibles and customers free their
   //                 own dynamic memory
   // Postconditions: Frees the memory associated with the transactionManager
   ~TransactionManager();


   //------------------------- logTransaction ----------------------------
   // Given a customer, item, and transaction type a transaction object is 
   // created and stored in the transaction history
   // Preconditions : Assumes that the collectibles and customers free their
   //                 own dynamic memory
   // Postconditions: Frees the memory associated with the transactionManager
   bool logTransaction(const Customer*& responsible, 
                       const Collectible*& item, 
                       std::string transactionType);


   //------------------------- DisplayTransactionHistory ----------------------
   // Traverses the transaction history tree and prints out all of the 
   // customers in alphebtic order and prints their transaction in chrological
   // order
   // Preconditions : Assumes that the print method exists for TransactionEntry
   // Postconditions: prints to the console the transaction history for each 
   //                 customer. Each transaction will appear on one line
   //                 indented by a tab under the customers name
   void displayTransactionHistory() const;


   //------------------------- DisplayCustomerHistory -------------------------
   // Traverses the tree looking for a given customer. If found the customers
   // transaction history is displayed in chronological order
   // Preconditions : Assumes that the print method exists for TransactionEntry
   // Postconditions: prints to the console the transaction history for the 
   //                 customer. Each transaction will appear on one line
   //                 indented by a tab under the customers name
   //                  
   //                 if the customer has not made a transaction an exception
   //                 is thrown
   void displayCustomersHistroy(const Customer*& responsible) const;
};