/*-- Simulation.h ----------------------------------------------------------
 
  Header file to define a Simulation data type for simulating the operation
  of an information/reservation center that services telephone calls.

  Basic operations:
    constructor:       constructs a Simulation object
    run():             carry out the simulation
    display():         output results of the simulation
    service():         service an incoming call
    checkForNewCall(): check if a new call has come in
    
  Note:  Assumes availability of a queue class with elements of type Call.
 -------------------------------------------------------------------------*/

#include <iostream>       // istream, ostream, >>, <<
#include <ctime>          // time()

#ifndef SIMULATION
#define SIMULATION

#include "Timer.h"
#include "Call.h"
#include "LQueue.h"       // Queue with elements of type Call

const int NUM_CATEGORIES = 5;
class Simulation
{
 public:
  /***** Function Members *****/
  /***** Constructor *****/
  Simulation();
  /*-----------------------------------------------------------------------
    Construct a Simulation object.

    Precondition:  None
    Postcondition: Input data members have been initialized with values
        entered by the user; output data members have been initialized 
    to 0; and random number generator has been initialized.
  -----------------------------------------------------------------------*/

  /***** Running the simulation *****/
  void run();
  /*-----------------------------------------------------------------------
    Run the simulation.

    Precondition:  None.
    Postcondition: Simulation of phone service has been completed and
        performance statistics output.
  -----------------------------------------------------------------------*/

  /***** Output *****/
  void display(ostream & out);
  /*----------------------------------------------------------------------
    Display results of the simulation.

    Precondition:  ostream out is open.
    Postcondition: Total number of calls and the average waiting time
        for calls have been output to out.
  -----------------------------------------------------------------------*/

  /***** Call processing *****/
  void service(int & busyTimeRemaining);
  /*----------------------------------------------------------------------
    Service the current call (if any).

    Precondition:  None
    Postcondition: busyTimeRemaining has been decremented by one if a call
        was being serviced; otherwise, if there were incoming calls, a 
        call has been removed from myIncomingCalls, its service time      
        assigned to busyTimeRemaining, and its waiting time in the queue
        added to myTotalWaitingTime.
  -----------------------------------------------------------------------*/

  void checkForNewCall();
  /*----------------------------------------------------------------------
    Check if a new call has arrived and if so, add it to the
    queue of incoming calls.

    Precondition:  None.
    Postcondition: myIncomingCalls has been updated.
  -----------------------------------------------------------------------*/
 
 private:
  /***** Data Members *****/   
   //-- Inputs
   int    myLengthOfSimulation;
   double myArrivalRate;
   int    myServicePercent[NUM_CATEGORIES];

   //-- Outputs
   int    myCallsReceived;
   double myTotalWaitingTime;

   //-- Countdown Timer
   Timer myTimer;
   
   //-- Queue of calls waiting for service
   Queue myIncomingCalls;

};  // end of class declaration

#endif