extends Reference

var item_map = {}
var total_weight = 0
  
func _init(items, weights):
	item_map.clear()
	# Calculate total weight and accumulate the weight for each item
	for i in items.size():
		total_weight += weights[i]
		var item : Resource = items[i]
		assert(item != null)
		item_map[item] = total_weight

func roll_for_loot() -> Resource:
	randomize()
	var rng = randi() % total_weight
	for item in item_map.keys():
	# if the RNG is <= item cumulated weight then drop that item
		if rng <= item_map[item]:
			return item
	return null