#include <iostream>
#include <curses.h>

using namespace std;

void finish();
void initCurses();
int getCheckVelocity(int xy, int v, int max);

main()
{
    /* initialize your non-curses data structures here */
  initCurses();
  bool flag = false;
  int maxy = 25, maxx = 80;
  int x = maxx/2, y = maxy/2;
  int vx = 0, vy = 0;
  mvaddch(y, x, 'O');
  int c;
  while(true){
    c = getch();     /* REFRESH, accept single keystroke of input */

    mvaddch(y, x, ' '); // Erase old ball
    switch(c){
    case 'a':
    case 'A':
      vx = -1;
      vy = 0;
      break;

    case 'd':
    case 'D':
      vx = 1;
      vy = 0;
      break;

    case 'w':
    case 'W':
      vy = -1;
      vx = 0;
      break;

    case 's':
    case 'S':
      vy = 1;
      vx = 0;
      break;

    case 'q':
    case 'Q':
      flag = true;
      break;
    }
    if(flag) break;

    vy = getCheckVelocity(y, vy, maxy);
    vx = getCheckVelocity(x, vx, maxx);

    y = y + vy;
    x = x + vx;
    
    mvaddch(y, x, 'O'); // display ball at new location
  }
  
  finish();               /* we're done */
  return 0;
}


int getCheckVelocity(int xy, int v, int max){
  int vel = v;
  if(xy + v <= 0 || xy + v >= max){
      vel = -v;
  }
  return vel;
}

  


void finish()
{
    endwin();

    /* do your non-curses wrapup here */
    system("clear");
    cout << "All Done!" << endl;
    system("pause");

}

void initCurses(){
    (void) initscr();      /* initialize the curses library */
    keypad(stdscr, TRUE);  /* enable keyboard mapping */
    (void) nonl();         /* tell curses not to do NL->CR/NL on output */
    (void) cbreak();       /* take input chars one at a time, no wait for \n */
    (void) noecho();       /* don't echo input */

    halfdelay(1);          /* modifies getch to wait 1/10 of a second
			      for input and if user hasn't typed
			      anything getch returns ERR else returns
			      the character typed by user */

}