@tool
extends Node2D
class_name Event2D

# 当前事件
@export var event: StringName
@export var hide_if_on_stage: Array[int] = []
# 前置依赖事件，为空时意味着无前置事件
@export var pre_event: StringName
@export var hide_if_pre_on_stage: Array[int] = []
@export_tool_button("创建脚本") var create_script := _create_script

var prev_stage := 0
var stage := 0


func _ready() -> void:
	if Engine.is_editor_hint():
		return
	if event == &"":
		printerr("[Event2D] event is not set. continue processing...")
	stage = EventManager.get_stage(event)
	refresh_visibility()
	SceneManager.ground_ready.connect(_on_ground_ready)
	EventManager.stage_updated.connect(_on_global_stage_updated)


func refresh_visibility() -> void:
	var should_show = not stage in hide_if_on_stage and not prev_stage in hide_if_pre_on_stage
	if visible != should_show:
		visible = should_show


func _on_global_stage_updated(e: StringName, s: int):
	var updated = false
	var pre_updated = false
	if e == pre_event:
		pre_updated = prev_stage != s
		prev_stage = s
		print("[Event2D] Pre-event stage updated: %s, stage: %s" % [pre_event, prev_stage])
	elif e == event:
		updated = stage != s
		stage = s
		print("[Event2D] Event stage updated: %s, stage: %s" % [event, stage])
	refresh_visibility()
	if pre_updated:
		_on_pre_stage_updated()
	if updated:
		_on_stage_updated()


func _on_ground_ready(ground: Ground2D):
	pass


func _on_pre_stage_updated():
	pass


func _on_stage_updated():
	pass


###### TOOL BUTTON

var script_template = preload("uid://bmxsei74o3pyw") as Script


func _create_script():
	var script = script_template.duplicate(true) as Script
	var ground = get_node("..")
	while ground and not ground is Ground2D:
		ground = ground.get_node("..")
	if not ground:
		printerr("[Event2D] _create_script Ground2D not found.")
		return
	var chapter = ground.scene_name.substr(0, 3)
	if len(chapter) != 3:
		printerr("[Event2D] _create_script chapter name error: %s" % ground.scene_name)
		return
	var file_name = name.to_snake_case() + ".gd"
	var path = "res://scene/ground/script/" + chapter + "/" + file_name
	if FileAccess.file_exists(path):
		print("file exists, reattach the script to node: %s" % path)
		set_script(load(path))
		return
	ResourceSaver.save(script, path)
	set_script(load(path))
	print("[Event2D] Script created: %s" % path)