/* Game Class --  Tetris
 * This is a container which holds the grid and the current piece
 * and conrols game play.   It relay commands to and from those members.
 *
 * Tetris is a fascinating game that involves aligning pieces composed
 * of 4 squares into solid rows, which are then removed.  The objective
 * is to see how many solid rows you can make.
 */

#include "grid.h"
#include "piece.h"

// Game -- controls the grid and piece
class Game {
public:
	// no default constructor as a display is needed for graphics


	// constructor 
	Game(GP142Display *display, Grid *grid);

	// draw the grid and piece on the display
	void Draw();

	// move the current piece in direction d (usually down)
	void MovePiece(Direction d);

	// rotate the piece clockwise
	void RotatePiece();

	// if the piece can no longer move down, 
	// we make it part of the grid and remove it.
	// generate a new piece if needed
	void UpdatePiece();

	// check for and remove completely filled in rows
	void CheckRows();

	// returns true if a piece occupies the same
	// space as some part of the grid 
	// (usually happens when a new piece is made, signifies game is over)
	bool IsGameOver() const;

private:

	// Generate a random new piece and return a pointer  to it.
	Piece *NewPiece() const;

	// returns an int, 0<= int <= 6
	int RandomNumber() const;

	GP142Display *display;	// all graphics are done on display
	Grid *grid;				// what pieces have already been dropped
	Piece *piece;			// current piece that is dropping
};