/*--- qtester.cpp -------------------------------------------------
  Program to test class Queue.

  Input (keyboard): Commands entered by the user.
  Output (screen):  List of commands and messages describing
                    the effects of each command.
  
  Written by:   Larry R. Nyhoff
   
  Written for:  Lab Manual for ADTs, Data Structures, and Problem
                Solving with C++, 2E

                               Lab #7.1
  ------------------------------------------------------------------*/

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

#include "Queue.h"


void showCommands()
/*--------------------------------------------------------------
  Function to list the available commands.
----------------------------------------------------------------*/
{
  cout << "Use the following commands to test the Queue class:\n"
       << "a --- add an element to the queue\n"
       << "d --- display contents of queue\n"
       << "e --- test whether a queue is empty\n"
       << "f --- retrieve the item at the front of the queue\n"
       << "h --- help -- print this list of commands\n"
       << "r --- remove item from front of the queue\n"
       << "q --- quit testing\n"
       << "u --- dump the queue (i.e. remove everything)\n";
}

int main()
{
  QueueElement item;      // item to add to the queue
  char command;           // user command (selected from menu)
  Queue q;                // The QUEUE

  for (int i = 1; i <= QUEUE_CAPACITY - 1; i++)
    q.enqueue(i);
  cout << "Here is the queue:\n";
  q.display(cout);
  cout << "It is full.\n\n";

  showCommands();
  do
  {
    cout << "Command? ";
    cin >> command;
    if (isupper(command)) command = tolower(command);

    switch(command)
    {
      case 'a':
                cout << "Enter item to add to queue: ";
                cin >> item;
                q.enqueue(item);
                cout << "--> " << item << " added\n";
                break;
      case 'd': 
                cout << "--> Queue contents:\n";
                q.display(cout);
                break;
      case 'e':
                cout << "--> Queue " << (q.empty() ? "is" : "is not")
                     << " empty\n";
                break;
      case 'f':
                cout << "--> " << q.front() << " is at the front\n";
                break;
      case 'h':
                showCommands();
                break;
      case 'r': 
                cout << "Removing front element from the queue\n";
                q.dequeue();
                break;
      case 'q':
                cout << "--> End of test\n";
                break;
      case 'u':
                while ( !q.empty() )
	               q.dequeue();
                cout << "--> Queue dumped\n";
                break;
      default:
                cout << "*** Illegal command: " << command << endl;
    }
  }
  while (command != 'q');
}