import CellSet;
import Grid;
import Toolbox;

return {
	ize: colorize,
	paint: paint
};

function colorize(row, column, color) {
	var grid = Grid.get();
	grid.data[row][column] = color || Toolbox.color();
	Grid.cell(row, column).className = grid.data[row][column];
	grid.missing.remove(row, column);
}

function paint(i0, j0) {
	var originColor = Grid.get().data[i0][j0];
	var done = CellSet.make();
	var queue = [{i: i0, j: j0}];
	while(queue.length > 0) {
		var p0 = queue[0];
		colorize(p0.i, p0.j);
		done.add(p0.i, p0.j);
		extend(p0, queue, done, originColor);
		queue.shift();
	}
}

function extend(p0, queue, done, originColor) {
	var size = Grid.get().size;
	for(var d = -1; d < 2; d += 2) {
		[{i: p0.i + d, j: p0.j}, {i: p0.i, j: p0.j + d}].forEach(function(p1) {
			if(p1.i >= 0 && p1.i < size && p1.j >= 0 && p1.j < size
				&& !done.contains(p1.i, p1.j)
				&& Grid.get().data[p1.i][p1.j] == originColor) {
				queue.push(p1);
			}
		});
	}
}