extends CharacterBody2D
@onready var bullet = preload("res://scene/entities/bullet.tscn")
@onready var animated_sprite = $AnimatedSprite2D
@onready var muzzle = $FIRE
@onready var TimerFIRE = $TimerFIRE
@onready var hurt_timer = $Timerinvincibility
const SPEED = 140.0
const JUMP_VELOCITY = -230.0
const JUMP_MAX = 2
var JUMP_COUNT = 0
var HP = 3
var invincibility = false
var is_jump : bool = false
var respawn_position

@onready var hp_icons = [
	$HP_Block,  # 对应第1滴血
	$HP_Block2, # 对应第2滴血
	$HP_Block3  # 对应第3滴血
]
const MAX_HP = 3 # 最大血量

# 刷新 UI 的核心函数
func _update_hp_ui():
	# 遍历所有的生命图标
	for i in range(hp_icons.size()):
		# 如果索引小于当前HP，就显示，否则隐藏
		# 比如 HP=2，那么 i=0(显示)、i=1(显示)、i=2(隐藏)
		hp_icons[i].visible = i < HP

func _ready() -> void:
	animated_sprite.play("IDLE")
	add_to_group("Player")
	hurt_timer.timeout.connect(_on_hurt_timer_timeout)
	
	# 1. 从全局单例读取血量（注意大小写要和 Global.gd 里一致！）
	if Global:
		HP = Global.player_HP
	else:
		HP = 3 # 如果没有全局单例，默认给3滴血（防止报错）
	
	# 2. 寻找第二关场景里的出生点 (需要你给出生点节点加上 "SpawnPoint" 组)
	var spawn_point = get_tree().get_first_node_in_group("SpawnPoint")
	if spawn_point:
		global_position = spawn_point.global_position # 把玩家移动到出生点
	
	# 3. 更新玩家死亡后的复活点（非常重要！否则在第二关死了会复活回第一关的位置）
	respawn_position = global_position
	
	# 4. 刷新血量UI，确保血条显示正确
	_update_hp_ui()

func _physics_process(delta: float) -> void:
	# Add the gravity.
	if not is_on_floor():
		velocity += get_gravity() * delta
	else:
		JUMP_COUNT = 0
	# Handle jump.
	if Input.is_action_just_pressed("move_up") and JUMP_COUNT < JUMP_MAX:
		velocity.y = JUMP_VELOCITY
		animated_sprite.play("JUMP")
		JUMP_COUNT += 1
		if JUMP_COUNT == 1:
			is_jump = true
			animated_sprite.play("JUMP")
			is_jump = false
		elif JUMP_COUNT == 2:
			animated_sprite.play("DOUBLE_JUMP")
			await get_tree().create_timer(0.26).timeout
			animated_sprite.play("JUMP")
			
			

	# Get the input direction and handle the movement/deceleration.
	# As good practice, you should replace UI actions with custom gameplay actions.
	var direction := Input.get_axis("move_left", "move_right")
	
	if invincibility:#无敌帧
		if direction < 0:                      #无敌阵期间
			animated_sprite.flip_h = true     
		elif direction > 0:
			animated_sprite.flip_h = false
		velocity.x = SPEED * direction
		move_and_slide()
	else:
		if direction < 0:                       #动画运行
			animated_sprite.flip_h = true
		elif direction > 0:
			animated_sprite.flip_h = false
		if direction != 0 :
			velocity.x = SPEED * direction      #RUN动画
			if animated_sprite.animation != "RUN" and is_on_floor() and not is_jump:
				animated_sprite.play("RUN")
		else:                                   #IDLE动画
			if is_on_floor() and not is_jump:
				velocity.x = move_toward(velocity.x, 0, SPEED)
				animated_sprite.play("IDLE")

		move_and_slide()
	
	if Input.is_mouse_button_pressed(MOUSE_BUTTON_LEFT) and TimerFIRE.is_stopped():
		shoot()
		TimerFIRE.start()
	

func shoot():                     #射击
	var bullet_scene = bullet.instantiate()
	var mouse_pos = get_global_mouse_position()
	bullet_scene.target_pos = mouse_pos
	bullet_scene.global_position = muzzle.global_position
	get_parent().add_child(bullet_scene)

func die():                       #死亡
	HP = 3
	velocity = Vector2.ZERO
	global_position = respawn_position
	_update_hp_ui()
	animated_sprite.play("IDLE")
	invincibility = true
	hurt_timer.start() 
	
	
func take_damage(amount:int):     #伤害
	if invincibility:
		return
	HP -= amount
	if HP <0:
		HP = 0
	_update_hp_ui()
	animated_sprite.play("HIT")
	#print("当前的HP是：", HP)
	if HP <= 0:
		die()
	else:
		invincibility = true # 开启无敌
		hurt_timer.start()   # 启动无敌计时器
func _on_hurt_timer_timeout() -> void:
	invincibility = false

func heal(amount:int):
	if HP >= MAX_HP:
		return
	HP += amount
	_update_hp_ui()