#ifndef STATE_H
#define STATE_H
///////////////////////////////////////////////////////////////
//  state.h    - defines states in terms of the events       //
//               that trigger transitions to another state   //
//                                                           //
//  ver 1.1      Adds hooks for new state                    //
//  Platform:    Dell XPS 8920, Windows 10                   //
//  Application: CSE776 - Design Patterns : State Pattern    //
//  Author:      Jim Fawcett, CST 2-187, (314) 443-3948      //
//               jfawcett@twcny.rr.com                       //
///////////////////////////////////////////////////////////////

#include <vector>
#include <cstdlib>

struct Context;

class ElevBase {

public:
  ElevBase* getRegistered(int n);
  ElevBase* getEvent(ElevBase *pState);

  virtual ElevBase* upButton() { return this; }  // OnFirstFloor  overrides
  virtual ElevBase* dnButton() { return this; }  // OnSecondFloor overrides
  virtual ElevBase*  arrived() { return this; }  // GoingUp and GoingDown override
  virtual ElevBase* newEvent() { return this; }  // BreakingCable overrides
    // this is a hook to add in new events

  static ElevBase* makeElevStates();

  virtual ~ElevBase() = 0  // make this class abstract - note definition
  {
    std::cout << "\n  destroying ElevBase abstract state";
  }
protected:
  static Context* pContext_;
};

///////////////////////////////////////////////////////////////
//  concrete state classes                                   //
///////////////////////////////////////////////////////////////

//----< on the first floor >-----------------------------------

class OnFirstFloor   : public ElevBase
{
public:
  virtual ~OnFirstFloor ();
  virtual ElevBase* upButton() override;
  static ElevBase* makeState();
};

//----< going up to second floor >-----------------------------

class GoingUp       : public ElevBase 
{
public:
  virtual ~GoingUp();
  virtual ElevBase* arrived() override;
  static ElevBase* makeState();
};

//----< on the second floor >----------------------------------

class OnSecondFloor : public ElevBase
{
public:
  virtual ~OnSecondFloor();
  virtual ElevBase* dnButton() override;
  static ElevBase* makeState();
};

//----< going down to first floor >----------------------------

class GoingDown     : public ElevBase
{
public:
  virtual ~GoingDown();
  virtual ElevBase* arrived() override;
  static ElevBase* makeState();
};

#endif