var max = 3;
var score = 0;
var moves = 0;

function press(form, button) {
	name = button.name;
	x = name.substring(0,1);
	y = name.substring(2,3);
	play(form, (x-1+1), (y-1+1));
}

function play(form, x, y) {
	moves++;
	toggle(form, x, y);
	toggle(form, x-1, y);
	toggle(form, x+1, y);
	toggle(form, x, y-1);
	toggle(form, x, y+1);
	if (score == 16) {
		if (moves == 4) { w = 'That\'s the best possible score!'; }
						else { w = 'See if you can do any better!'; }
						alert('You win after ' + moves + ' moves! \n' + w);
		resetboard(form);
	}
}

function showrules() {
	rules = 'Toggler - from flooble.com \n\n'
		+ 'The goal of the game is to turn \n' 
		+ 'all the buttons from [X] to [.]. \n'
		+ 'This is done by clicking buttons. \n'
		+ 'When a button is clicked, its state is \n'
		+ 'toggeled, but so is the state of four \n'
		+ 'buttons around it, so plan carefully! \n';
	alert(rules);
}

function resetboard(form) {
	var i,j,button;
	for (i = 0; i < 4; i++) {
		for (j = 0; j < 4; j++) {
			button = getelement(form, i + '_' + j);	
			button.value='X';
		}
	}
	score = 0;
	moves = 0;
}

function getelement(form, name) {
	var k;
	var elements = form.elements;
	for (k = 0; k < elements.length; k++) {
		if (elements[k].name == name) return elements[k];
	}
}

function toggle(form, x, y) {
	if (x < 0 || y < 0 || x > max || y > max) {
		//alert('Ignore (' + x + ',' + y + ')');
		return;
	}
	name = x + '_' + y;
	button = getelement(form, name);
	a = button.value;
	button.value = '!!!';
	//alert(a + '  (' + x + ',' + y + ')') ;
	button.value = a;
	if (button.value == 'X') {
		button.value = '.';
		score ++;
	} else {
		button.value = 'X';
		score --;
	}
}