extends Node3D
class_name Buff

@onready var character = (get_owner() as Character)
@onready var status = (%Status as Status)

class BuffInfo:
	var name : String
	var duration_max : float
	var duration : float

var buff_map = {} #命中信息

func _process(delta):
	for buff_name in buff_map:
		var buff_info = buff_map[buff_name]
		if has_buff("pause") and buff_name!="pause":
			continue
		if buff_info.duration == -1:
			trigger_buff_effect(buff_info,"update")
		else:
			buff_info.duration += delta
			if buff_info.duration >= buff_info.duration_max:
				trigger_buff_effect(buff_info,"end")
				buff_map.erase(buff_name)
			else:
				trigger_buff_effect(buff_info,"update")

func trigger_buff_effect(buff:BuffInfo,trigger_name:String):
	var buff_name = buff.name
	var function_name = "on_%s_%s" % [trigger_name,buff_name]
	if has_method(function_name):
		var rate = buff.duration/buff.duration_max
		call(function_name,rate)

func has_buff(buff_name:String) -> bool:
	return buff_name in buff_map
	
func add_buff(buff_name:String,duration:float):
	var buff : BuffInfo
	if buff_name in buff_map:
		buff = buff_map[buff_name]
	else:
		buff = BuffInfo.new()
		buff.name = buff_name
		buff_map[buff_name] = buff
	buff.duration_max = duration
	buff.duration = 0
	trigger_buff_effect(buff,"start")

#==具体实现==
func on_end_hit_back(rate):status.hit_back_speed = 0
func on_end_hit_up(rate):status.hit_up_speed = 0
func on_start_stagger(rate):status.is_stagger = true
func on_end_stagger(rate):status.is_stagger = false
func on_end_stun(rate):status.is_stun = false
func on_start_jumping(rate):status.is_jumping = true
func on_end_jumping(rate):status.is_jumping = false
func on_update_shake_x(rate):
	var offset = sin(rate * PI * 4) - 0.5
	status.shake_offset = Vector3(offset*0.02,0,0);
func on_end_shake_x(rate):status.shake_offset = Vector3.ZERO
func on_start_pause(rate):status.is_pause = true
func on_end_pause(rate):status.is_pause = false