class_name Sand
extends GameMaterial

func _init() -> void:
	name = "Sand"
	color = Color.GOLD
	density = 0.2
	
func update(grid: GameGrid, y, x) -> void:
	var this = grid.get_material_at_position(y, x)
	
	# Water should fall if element below has less density
	if grid.get_bottom_of(y, x).density < this.density:
		grid.swap_with(y, x, grid.BOTTOM)
		Game.material_changed()
		return

	if grid.get_bottom_left_of(y, x).density < this.density and grid.get_left_of(y, x).density < this.density:
		grid.swap_with(y, x, grid.BOTTOM_LEFT)
		Game.material_changed()
		return

	if grid.get_bottom_right_of(y, x).density < this.density and grid.get_right_of(y, x).density < this.density:
		grid.swap_with(y, x, grid.BOTTOM_RIGHT)
		Game.material_changed()
		return