class_name ItemSpawn extends Node2D

@export var common_items : Array[PackedScene]
@export var rare_items : Array[PackedScene]
static var unique_items : Array[PackedScene] = [] 

@export var rarity_bonus : float = 0
@export var guarantee_rare : bool = false

@export var unique_base_chance = .02
@export var rare_base_chance = .04
@export var unique_bonus_multiplier = .025
@export var rare_bonus_multiplier = .1

var remove_after_spawn = false

func choose_pool() -> Array[PackedScene]:
	var unique_chance = unique_base_chance + unique_bonus_multiplier * rarity_bonus
	var rare_chance = rare_base_chance + rare_bonus_multiplier * rarity_bonus
	
	var random = randf()
	if random < unique_chance && unique_items.size() > 0:
		remove_after_spawn = true
		return unique_items
	elif random < unique_chance + rare_chance || guarantee_rare:
		return rare_items
	return common_items
	
func _ready():
	var pool = choose_pool()
	var index = randi_range(0, pool.size() - 1)
	var packed_scene : PackedScene = pool[index]
	if remove_after_spawn:
		unique_items.remove_at(index)
	var object = packed_scene.instantiate()
	add_child.call_deferred(object)
	object.reparent.call_deferred(get_parent())

static func refill_unique_item_pool():
	unique_items = [
	load("res://items/permanent_items/backslash/backslash.tscn"),
	load("res://items/permanent_items/high_jump/high_jump.tscn"),
	load("res://items/permanent_items/upslash/upslash.tscn"),
	load("res://items/active_items/horizontal_dash/horizontal_dash.tscn")
	]