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#include "DarkGDK.h"

// global variables - used for the camera
float g_fSpeed        = 0.1f;		// speed at which camera moves
float g_fTurn         = 0.03f;		// turn speed for mouse look
float g_fOldCamAngleX = 0.0f;		// to store original x angle
float g_fOldCamAngleY = 0.0f;		// to store original y angle
float g_fCameraAngleX = 0.0f;		// to sotre new x angle
float g_fCameraAngleY = 0.0f;		// to store new y angle

void UserInput ( void )
{
	dbControlCameraUsingArrowKeys ( 0, g_fSpeed, g_fTurn );

	g_fOldCamAngleY = g_fCameraAngleY;
	g_fOldCamAngleX = g_fCameraAngleX;

	g_fCameraAngleY = dbWrapValue ( g_fCameraAngleY + dbMouseMoveX ( ) * 0.4f );
	g_fCameraAngleX = dbWrapValue ( g_fCameraAngleX + dbMouseMoveY ( ) * 0.4f );

	dbYRotateCamera ( dbCurveAngle ( g_fCameraAngleY, g_fOldCamAngleY, 24 ) );
	dbXRotateCamera ( dbCurveAngle ( g_fCameraAngleX, g_fOldCamAngleX, 24 ) );

	char* szKey = dbInKey ( );

	if ( strcmp ( szKey, "+" ) == 0 )
	{
		if ( g_fSpeed < 1000 )
			g_fSpeed = g_fSpeed + 0.01f;
	}

	if ( strcmp ( szKey, "-" ) == 0 )
	{
		if ( g_fSpeed > 0.02f )
			g_fSpeed = g_fSpeed - 0.01f;
	}

	//float fHeight = dbGetTerrainGroundHeight ( 1, dbCameraPositionX ( ), dbCameraPositionZ ( ) );

	dbPositionCamera ( dbCameraPositionX ( ), 0 /*fHeight + 3.0f*/, dbCameraPositionZ ( ) );
}

/** 
  @brief  Entry point to the application.
*/ 
void DarkGDK(void)
{
	dbSyncOn   ( );
	dbSyncRate ( 0 );

  dbSetDisplayModeVSync(800, 600, 32, 0);

  dbLoadObject("HighPolyCount.x", 1); // Object close to the player
  dbLoadObject("MidPolyCount.x", 2);  // Object moderately distant from the player
  dbLoadObject("LowPolyCount.x", 3);  // Object far, far away from the player

  for (int i=1; i<4; i++)
  {
    dbPositionObject(i, 0, 0, 0);
    dbScaleObject(i, 300, 300, 300);
    dbHideObject(i);
  }

  int visible_object=0;
  float fast_distance=0;

  while (LoopGDK())
  {
    UserInput();

    // we can get away with this since all objects are at <0,0,0> coords
    float fast_distance= ((dbCameraPositionX() * dbCameraPositionX()) +
                          (dbCameraPositionY() * dbCameraPositionY()) +
                          (dbCameraPositionZ() * dbCameraPositionZ()));

    dbHideObject(visible_object);
    if (fast_distance>50000) {
      visible_object=3;
    }
    else if ((fast_distance>=30000) && (fast_distance<=50000)) {
      visible_object=2;
    }
    else if (fast_distance<30000) {
      visible_object=1;
    }

    dbShowObject(visible_object);

    char txt[50]="0";
    sprintf_s(txt, 50, "FPS: %d   DISTANCE: %f", dbScreenFPS(), fast_distance);
    dbText(0,0,txt);

    dbSync();
  }

}