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local function score(recipe)
	local recipe_prototype = game.recipe_prototypes[recipe.recipe]
	local result = game.item_prototypes[recipe_prototype.products[1].name]

	local score = 10

	if result.attack_parameters then -- guns
		score = 13000
	elseif result.magazine_size then -- bullets
		score = 10000
	elseif result.resistances then -- armor
		score = 7000
	elseif result.speed then -- repair kit and mining tools
		score = 3000
	--[[
	elseif result.fuel_category then -- solid fuel
		score = 1800
	--]]
	elseif result.capsule_action then -- capsules
		score = 1000
	elseif result.place_result then -- buildings
		score = 500
	elseif result.type == 'tool' then -- science packs
		score = 320
	elseif result.place_as_tile_result then -- tiles
		score = 80
	elseif result.module_effects then -- modules
		score = 1
	end
	
	return score / math.sqrt(recipe_prototype.energy) / recipe.count
end

script.on_event(defines.events.on_pre_player_crafted_item, function(event)
	global.busy = global.busy or {}
	local busy = global.busy
	local pid = event.player_index
	
	if busy[pid] then return end
	local player = game.players[pid]
	if player.crafting_queue_size == 1 then return end
	
	local inventory_size = player.character_inventory_slots_bonus
	player.character_inventory_slots_bonus = 10 * inventory_size + 2000

	local current = player.crafting_queue[#player.crafting_queue]
	local current_score = score(current)
	
	player.cancel_crafting({index=current.index, count=current.count})
	
	local cache = {}
	while player.crafting_queue do
		local this = player.crafting_queue[#player.crafting_queue]
		if this.recipe == current.recipe or score(this) > current_score then break end
		cache[#cache + 1] = this
		player.cancel_crafting({index=this.index, count=this.count})
	end
	
	busy[pid] = true
	
	player.begin_crafting{count=current.count, recipe=current.recipe}

	for i = #cache, 1, -1 do
		local v = cache[i]
		player.begin_crafting({count = v.count, recipe = v.recipe})
	end

	player.character_inventory_slots_bonus = inventory_size

	busy[pid] = nil
end)