// Building.h

const int yposFloorNo[5] = { 21, 17, 13, 9, 5 };

#include "elevator.h"
#include "elevatorbutton.h"
#include "interface.h"

class Building : public ElevatorButton
{
public:
   /* default constructor is used to display the building and all interfaces   */
   Building();
   
   /* this algorithm will decide which elevator moves by accepting             */
   /* three arguments: position of first and second elevator and               */
   /* position of the destination                                              */
   int DecideElevator(int, int, int);
   
   /* this member function will build two elevators and display them on screen */
   void BuildElevator ();
   
   /* this member function is the main executor of Elevator Simulation         */
   void ElevatorRun (Elevator, Elevator );

private:
   int liftchoose;

};


Building :: Building ()       
{
     textbackground(4);
     clrscr();
     textattr(15 | 4*16);
     
     gotoxy(2,4);     cprintf("ÚÄÄÄÄ ÄÄÄÄÄÄÄÄÄÄÄÄÄ ÄÄÄÄ¿");
     gotoxy(2,5);     cprintf("³                       ³");
     gotoxy(2,6);     cprintf("³           5           ³");
     gotoxy(2,7);     cprintf("³                       ³");
     gotoxy(2,8);     cprintf("³ÄÄ     ÄÄÄÄÄÄÄÄÄ     Äij");
     gotoxy(2,9);     cprintf("³                       ³");
     gotoxy(2,10);    cprintf("³           4           ³");
     gotoxy(2,11);    cprintf("³                       ³");
     gotoxy(2,12);    cprintf("³ÄÄ     ÄÄÄÄÄÄÄÄÄ     Äij");
     gotoxy(2,13);    cprintf("³                       ³");
     gotoxy(2,14);    cprintf("³           3           ³");
     gotoxy(2,15);    cprintf("³                       ³");
     gotoxy(2,16);    cprintf("³ÄÄ     ÄÄÄÄÄÄÄÄÄ     Äij");
     gotoxy(2,17);    cprintf("³                       ³");
     gotoxy(2,18);    cprintf("³           2           ³");
     gotoxy(2,19);    cprintf("³                       ³");
     gotoxy(2,20);    cprintf("³ÄÄ     ÄÄÄÄÄÄÄÄÄ     Äij");
     gotoxy(2,21);    cprintf("³                       ³");
     gotoxy(2,22);    cprintf("³           1           ³");
     gotoxy(2,23);    cprintf("³                       ³");
     gotoxy(2,24);    cprintf("ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ");

     for(int i=1; i<26; ++i )  {  gotoxy(45,i);  cprintf("³");  }
     
     DisplayIt();
}

void Building :: BuildElevator ()
{
     Elevator One (5,21);     // build elevator One
     Elevator Two(19,21);     // build elevator Two

     ButtonCall();            // diplay Call menu
     ElevatorRun(One, Two);              
}

void Building :: ElevatorRun ( Elevator One, Elevator Two )
{
   int no;
   One.floorNo = 1;
   Two.floorNo = 1;

   while(1)
   {
     gotoxy(66,9);  cout<< One.floorNo;
     gotoxy(72,9);  cout<< Two.floorNo;

     no = ActivateButton();
     liftchoose = DecideElevator( One.y, Two.y, yposFloorNo[no - 1] );

     if (liftchoose == 1 )     // first elevator
     {   
         One.movewhere ( yposFloorNo[no - 1] );
         One.floorNo = no;         
         gotoxy(66,9);  cout<< One.floorNo;
         One.Enter(66);         

         no = DestinationButton ( yposFloorNo[no - 1] );

         One.movewhere ( yposFloorNo[no - 1] );
         One.floorNo = no;         
         gotoxy(66,9);  cout<< One.floorNo;
         One.Exit(66);
     }
     else                      // second elevator
     {   
         Two.movewhere ( yposFloorNo[no - 1] );
         Two.floorNo = no;
         gotoxy(72,9);  cout<< Two.floorNo;
         Two.Enter(72);

         no = DestinationButton ( yposFloorNo[no - 1] );

         Two.movewhere ( yposFloorNo[no - 1] );
         Two.floorNo = no;
         gotoxy(72,9);  cout<< Two.floorNo;
         Two.Exit(72);
     }           

   }
}

int Building :: DecideElevator (int y1, int y2, int ycall )
{
     if ( abs(ycall - y1) < abs(ycall - y2) )   return 1;   // first elevator
     else return 2;                                         // second elevator
}