local event = require 'utils.event'
local math_random = math.random

local rock_raffle = {"sand-rock-big", "rock-big", "rock-big", "rock-big", "rock-huge"}

local function on_entity_died(event)
	if not global.crumbly_walls_unlocked then return end
	local entity = event.entity
	if not entity.valid then return end
	if entity.name ~= "stone-wall" then return end
	if math_random(1,4) == 1 then return end
	entity.surface.create_entity({name = rock_raffle[math_random(1, #rock_raffle)], position = entity.position, force = "player"})
end

event.add(defines.events.on_entity_died, on_entity_died)