local function lit_rocket(pos)
	minetest.add_particlespawner(
		3, --amount
		0.1, --time
		{x=pos.x-0.2, y=pos.y-0.2, z=pos.z-0.2}, --minpos
		{x=pos.x+0.2, y=pos.y+0.2, z=pos.z+0.2}, --maxpos
		{x=-0, y=-0, z=-0}, --minvel
		{x=0, y=0, z=0}, --maxvel
		{x=-0.5,y=5,z=-0.5}, --minacc
		{x=0.5,y=5,z=0.5}, --maxacc
		0.1, --minexptime
		1, --maxexptime
		2, --minsize
		8, --maxsize
		false, --collisiondetection
		"smoke_puff.png" --texture
	)
	minetest.sound_play("extrablocks_rbp_lit", {pos = pos,	gain = 0.2,	max_hear_distance = 3})
end
--http://www.freesound.org/people/roubignolle/sounds/36352/

local function off_rocket(pos)
	minetest.sound_play("extrablocks_rbp_off", {pos = pos,	gain = 0.2,	max_hear_distance = 3})
end

local function acc(p)
	if p:get_player_control()["sneak"] then
		return 0.1
	end
	return -1
end

minetest.register_craftitem("extrablocks:rocket_bag", {
	description = "Experimental Rocket Bag",
	inventory_image = "extrablocks_rbp.png",
	metadata = "off",
    on_use = function(itemstack, user)
		local item = itemstack:to_table();
		if item["metadata"]=="off" then
			local accel = acc(user)
			user:set_physics_override(nil,nil,accel)
			item["metadata"] = "on"
			lit_rocket(pos)
		else
			user:set_physics_override(nil,nil,1)
			item["metadata"] = "off"
			off_rocket(pos)
		end
		itemstack:replace(item)
		return itemstack
	end,
})