require "utils/event"

local function void_expansion(event)
	local surface = game.surfaces[1]
	local player = game.players[event.player_index]
	local tile_list = {}

	if event.entity.stack.name == "cliff-explosives" then
		for x = -2, 2 do
			for y = -2, 2 do
				local tile = surface.get_tile(event.entity.position.x+x, event.entity.position.y+y)
				if tile.name == "out-of-map" then
					table.insert(tile_list, {name = "dirt-1", position = tile.position})
				end
			end
		end
		if #tile_list > 0 then
			for i=1, #tile_list, 1 do
				surface.create_entity({name = "ground-explosion", position = tile_list[i].position})
			end
			surface.set_tiles(tile_list)
			event.entity.destroy()
		end
	end
end

Event.register(defines.events.on_player_dropped_item, void_expansion)