// HW4 starter code -- Tetris
// create and control the game Tetris

#include <cstdlib>
#include <ctime>
#include "gp142display.h"
#include "game.h"

const int PIECE_MOVE_TIME = 4;   // number of periodic events to wait before moving piece down
								 // increase to make the game easier (i.e. slower)

// pass key presses to the piece
void handle_key(char keyPress, Game &game);

// update the pieces, grid, and redraw the game
void handle_periodic(Game &game, bool &gameOver);

// true every PIECE_MOVE_TIME Periodic events
// resets time to 0 when true
bool time_up (int &time);

int main() {

	bool quit = false;		// = the Quit event occured
    bool gameOver=false;	// = when a new piece can't be greated and game has ended
	int  mouseX, mouseY;	// location of mouse click -- not used in Tetris
	char keyPress;			// which key was pressed to cause the Key event
	int  current_time = 0;  // how many periodic events have passed

	srand((int)time(NULL)); // initalize random number generator

	GP142Display display;	// screen everything appears on including grid and pieces
	Grid grid(&display);	// grid containing occupied squares
	
	Game game(&display, &grid);  // controls the game including the piece and grid

	display.clear(White);
	display.setAnimation(Run);
	
	game.Draw();

	// main event loop
    while (!gameOver && !quit)   {
		switch (display.getNextEvent(mouseX, mouseY, keyPress)) {
		case Quit:
			quit = true;
			break;
                
		case Key:
			handle_key(keyPress, game);
			break;
                
		case Periodic:
			// slow the game down by waiting PIECE_MOVE_TIME periods
			if (time_up(current_time)) {
				handle_periodic(game, gameOver);
			}
			break;

		case Mouse:
			break;                

		default:
			break;
        }
	}

	// Show that the game is ended
	display.write(-75,0,"GAME OVER",SeaGreen,24);


	// once game is over, wait until user quits
	while (!quit)   {
		switch (display.getNextEvent(mouseX, mouseY, keyPress)) {
		case Quit:
			quit = true;
			break;
		default:
			break;
		}
	 }
     

	return 0;
}



/****************** FUNCTIONS ************************/


// key presses manipulate the piece's movement.
// 'j' moves left, 'l' moves right, 'k' rotates
// the piece and ' ' (space) moves it down.
// given the keyPress, the game will take the
// appropriate action

void handle_key(char keyPress, Game &game) {

	// **** implement handling of the keyPress here ****

	// redraw game to reflect the movement
	game.Draw();
}


// control the game and set gameOver true if the game has ended.
void handle_periodic(Game &game, bool &gameOver) {
	game.MovePiece(DOWN);
	game.UpdatePiece();
	gameOver = game.IsGameOver();
	game.Draw();
	game.CheckRows();	
}


// true after every PIECE_MOVE_TIME periods, false otherwise
// 0 <= time <= PIECE_MOVE_TIME
bool time_up (int &time) {
	if (time == PIECE_MOVE_TIME) {
		time = 0;
		return true;
	}
	time++;
	return false;
}