--- v.4.3.3
require "defines"
require "util"
game.on_init(function() On_Load() end)
game.on_load(function() On_Load() end)

game.on_event(defines.events.on_robot_built_entity, function(event) On_Built(event) end)
game.on_event(defines.events.on_built_entity, function(event) On_Built(event) end)
game.on_event(defines.events.on_preplayer_mined_item, function(event) On_Removed(event) end)
game.on_event(defines.events.on_robot_pre_mined, function(event) On_Removed(event) end)
game.on_event(defines.events.on_entity_died, function(event) On_Removed(event) end)

			 
function On_Load()

	---- Rocket Silo Initialization ----	
	if not global.RocketSilos then
      global.RocketSilos = {}
	end
	
end

---------------------------------------------
function On_Built(event)
   
   --- Harder Ending Some action if you built the Rocket-silo!

   --- Add to Table 
	if event.created_entity.name == "rocket-silo" then
		local rocketSilos = global.RocketSilos
		local key = event.created_entity.position.x .. "X" .. event.created_entity.position.y

		rocketSilos[key] = event.created_entity
		global.RocketSilos = rocketSilos
		
		 -- Biters will attack the newly built Rocket Silo
		game.get_surface(1).set_multi_command({type=defines.command.attack,target=global.RocketSilos,distraction=defines.distraction.none},2000)
	end
   
   ---------------------------------------------

function On_Removed(event)
   
   
	--- Remove from table
	if event.entity.name == "rocket-silo" then
	  local rocketSilos = global.RocketSilos
	  local key = event.entity.position.x .. "X" .. event.entity.position.y
	  if rocketSilos[key] then
		rocketSilos[key] = nil
		global.RocketSilos = rocketSilos
	  end
	end

end