// MENU.CPP

void Error_1_Menu();

Menu::Menu() { headlist = NULL; taillist = NULL; currentlist = NULL;
	       _new_handler = &Error_1_Menu; }

int Menu::DisplayMenu()
{
	Crt.ClearScr();

	cout << "\n\t-----------------  CLASS LIST MENU -----------------\n\n";
	cout << "\t\t 0.) Print Current List \n"
	     << "\t\t 1.) Print All Lists \n"
	     << "\t\t 2.) Create New Link List \n"
	     << "\t\t 3.) Create New Stack List \n"
	     << "\t\t 4.) Create New Queue List \n"
	     << "\t\t 5.) Change to List ID Number \n"
	     << "\t\t 6.) Delete Current List \n"
	     << "\t\t 7.) Add Node to Current List \n"
	     << "\t\t 8.) Append a Node in Current List \n"
	     << "\t\t 9.) Delete Node from Current List \n"
	     << "\t\t M.) Memory Check \n"
	     << "\t\t E.) End this Program \n"
	     << "\n Enter Choice ==>"
	     ;

	Selection = Crt.GetChar();
	return( Process( Selection ) );
}

int Menu::Process( char S )
{
char buffer[ 256 ];
int x;
List *temp;

	cout << "\n\n";

	switch( S )
	{
	case '0':
		  if(currentlist )
			currentlist->Print();
		  else
			cout << " NO LISTS ARE CREATED! \n";
		  break;

	case '1': if( headlist )
		  {
			temp = headlist;
			while( temp )
			{
				temp->Print();
				temp = temp->Get_Right_List();
			}
		  }
		  else
			cout << " NO LISTS ARE CREATED! \n";

		  break;

	case '2':
		  if( ! headlist )
		  {
			temp = new LinkList;
			headlist = temp;
			taillist = headlist;
			currentlist = headlist;
		  }
		  else
		  {
			temp = new LinkList;
			currentlist = temp;
			currentlist->ConnectTo( taillist );
			taillist = currentlist;
		  }

		  cout << " New Link List Created \n";
		  break;

	case '3':
		  if( ! headlist )
		  {
			headlist = new Stack;
			taillist = headlist;
			currentlist = headlist;
		  }
		  else
		  {
			currentlist = new Stack;
			currentlist->ConnectTo( taillist );
			taillist = currentlist;
		  }

		  cout << " New Stack Created \n";
		  break;

	case '4':
		  if( ! headlist )
		  {
			headlist = new Queue;
			taillist = headlist;
			currentlist = headlist;
		  }
		  else
		  {
			currentlist = new Queue;
			currentlist->ConnectTo( taillist );
			taillist = currentlist;
		  }

		  cout << " New Queue Created \n";
		  break;

	case '5':
		  int found = 0;
		  if( headlist )
		  {
			Crt.ClearScr();
			temp = headlist;
			while( temp )
			{
				temp->Print();
				temp = temp->Get_Right_List();
			}
			temp = headlist;
			cout << " Enter List ID to Change to ==>";
			cin >> x;

			while( temp )
			{
				if( temp->List_ID() == x )
				{
					currentlist = temp;
					found = 1;
					break;
				}
				else
					temp = temp->Get_Right_List();
			}

		  if( found )
			currentlist->Print();
		  else
			cout << " LIST NOT FOUND ! \n";
		  }

		  else
			cout << " NO LISTS ARE CREATED! \n";

		  break;

	case '6':
		  if( currentlist )
		  {
			x = currentlist->List_ID();
			currentlist->Disconnect();

			if( headlist == currentlist )
				headlist = currentlist->Get_Right_List();
			if( taillist == currentlist )
				taillist = currentlist->Get_Left_List();

			delete currentlist;
			currentlist = headlist;
			cout << " LIST #" << x << " DELETED ";

		  }
		  else
			cout << " NO LISTS ARE CREATED ! \n";

		  break;

	case '7':
		  if( currentlist )
		  {
			Crt.ClearScr();
			currentlist->Print();
			cout << " Enter String ==>";
			cin >> buffer;
			cout << "\n";

			switch( *(currentlist->List_Name())  )
			{
			case 'L':
				currentlist->Insert( buffer );
				break;

			case 'S':
				currentlist->Push( buffer );
				break;

			case 'Q':
				currentlist->EnQueue( buffer );
				break;
			}
		  }

		  else
			cout << " NO LISTS ARE CREATED! \n";
		  break;

	case '8':
		  if( currentlist )
		  {
			currentlist->Print();

			cout << " Enter Node # to Append ==>";
			fflush( stdin );
			cin >> x;

			cout << " Enter String ==>";
			fflush( stdin );
			cin >> buffer;
			cout << "\n";

			currentlist->Append_Node( x, buffer );
		  }

		  else
			cout << " NO LISTS ARE CREATED! \n";


		  break;

	case '9':
		  if( currentlist )
		  {
			currentlist->Print();

			switch( *(currentlist->List_Name())  )
			{
			case 'L':
				cout << " Enter Node # to Delete ==>";
				fflush( stdin );
				cin >> x;
				currentlist->Remove( x );
				break;

			case 'S':
				currentlist->Pop();
				break;

			case 'Q':
				currentlist->DeQueue();
				break;
			}
		  }

		  else
			cout << " NO LISTS ARE CREATED! \n";

		  break;

	case 'M':
	case 'm':
		  Crt.MemChk();
		  break;

	case 'E':
	case 'e':
		  cout << " End Program? ( Y or N ) ";
		  if( Crt.GetChar() == 'Y' || Crt.GetChar() == 'y' )
		  {
			cout << "\n\n";
			Crt.Pause();
			return( 0 );
		  }
		  cout << "\n";
		  break;
	}

	cout <<"\n";
	Crt.Pause();
	return( 1 );
}

void Error_1_Menu()
{
	cerr << "\n\n\t MEMORY ERROR: NEW in Menu.CPP. \n";
	cout << "\n\tStack: " << stackavail() << " Stack Pointer: " << _SP;
	cout << " Core Left: " << coreleft() << "\n";
	exit ( 1 );
}

// MENU.CPP