@tool
extends Marker2D
class_name SignSnapper

signal arrived

@export var enabled := true
# 仅使用 x 坐标；否则也用 y 进行 walk to
@export var use_x_only := true
# 允许小幅调动，0-3px 被忽视，3-5px 被视作 5px
@export var auto_adjust := true
# x 左右有效范围
@export_range(0.0, 20.0, 0.1) var radius := 0.0
# 让玩家走到边缘，特别适用于 npc 对话等情景
@export var walk_to_edge := false
@export var action_on_arrived := 3
@export_tool_button("debug 检查玩家触发位置") var debug_check_player_pos = _debug_check_player_pos

var detacted_sign: Sign

# arrived 延时: delay_arrived-arrived
static var delay_arrived := 0.0
static var delay_after_action := 0.0


# 玩家在和 sign 交互时，如果读到节点中有 SignSnapper，则移动到该位置(x 对齐)
func _ready():
	if not get_parent():
		return
	for c in get_parent().get_children():
		if c is Sign:
			detacted_sign = c
			break
	if not detacted_sign and Engine.is_editor_hint():
		printerr("SignSnapper must have a Sign sibling node!")
	if not Engine.is_editor_hint():
		detacted_sign.interacted.connect(_on_interacted)


func _on_interacted():
	if not detacted_sign or not enabled:
		return
	var player = SceneManager.get_player()
	var target_pos = global_position
	if use_x_only:
		target_pos.y = player.global_position.y
	var player_x = player.global_position.x
	if (radius > 0 and absf(target_pos.x - player_x) > radius) or walk_to_edge:
		# clamp in range
		if target_pos.x > player_x:
			target_pos.x -= radius
		else:
			target_pos.x += radius
	var diff = absf(player_x - target_pos.x)
	if auto_adjust:
		# 允许小幅调动，0-3px 被忽视，3-5px 被视作 5px
		if diff < 3:
			target_pos.x = player_x
			diff = 0
		elif diff < 5:
			target_pos.x = player_x + (5 if target_pos.x > player_x else -5)
			diff = 5
	var tween
	if diff == 0:
		tween = create_tween()
	else:
		tween = player.walk_to(target_pos)
	if delay_arrived > 0:
		tween.tween_interval(delay_arrived)
	if action_on_arrived != 3:
		tween.tween_callback(SceneManager.player_action.bind(action_on_arrived))
	if delay_after_action > 0:
		tween.tween_interval(delay_after_action)
	tween.tween_callback(arrived.emit)


func _debug_check_player_pos():
	if not Engine.is_editor_hint():
		return
	var grounds = get_tree().get_nodes_in_group("ground")
	if not grounds:
		printerr("no ground")
		return
	var ground = grounds[0]
	if use_x_only:
		ground.replace_player_to_portal = true
	var player = ground.player
	if radius > 0:
		var player_x = player.global_position.x
		if absf(player_x - global_position.x) > radius:
			# clamp in range
			if player_x < global_position.x:
				player.global_position.x = global_position.x - radius
			else:
				player.global_position.x = global_position.x + radius
	else:
		player.global_position.x = global_position.x
	if not use_x_only:
		player.global_position.y = global_position.y