// Piece implementation
// JMC Oct 2000
// this file should not need to be modified
#include "piece.h"
const int NULL = 0;

// constructor
Piece::Piece() {
	display = NULL;
	grid = NULL;
	currentPosition = FULL;
	ableToMove = true;
	color = White;
}

// display piece on screen
void Piece::Draw() {
	for (int i=0; i<TETRIS; i++)
		squares[i].Draw(color);
}

// move piece in direction d if possible
// freeze the piece if it can't move down anymore
void Piece::Move(Direction d) {

	// move each of its squares direction d
	if (canMove(d)) {
		for (int i=0; i<TETRIS; i++)
			squares[i].Move(d);
	}

	// check if we should freeze the piece
	if (d == DOWN && !canMove(d))
		ableToMove = false;
}

// returns squares[i]
Square Piece::getSquare(int i) const{
	return squares[i];
}

// returns color of the piece
GP142Color Piece::getColor() const {
	return color;
}


// true if the piece could move in direction d
bool Piece::canMove(Direction d) const {
	if (!ableToMove)
		return false;

	// move is true if all squares can move in direction d
	bool move = true;
	for (int i=0; i<TETRIS; i++)
		move = (move && squares[i].canMove(d));

	return move;
}