@tool
extends Node

## 当任何事件的状态（stage）发生变化时发出此信号。
## 其他系统（如UI、角色状态机等）可以监听此信号来做出反应。
signal stage_updated(event_name: StringName, stage: int)

# 存储公式的字典。键是事件名称（StringName），值是当该事件更新时需要被评估的公式（Callable）数组。
# {event_name: [formula_callable_1, formula_callable_2, ...]}
var formula_dict: Dictionary[StringName, Array] = {}


# 节点初始化时，异步加载并解析事件规则。
func _ready() -> void:
	# 异步加载，避免阻塞主线程。
	# 使用 await a, b 语法等待协程完成。
	await _load_and_parse_formulas()
	stage_updated.connect(_on_stage_updated_for_handnote)


# 将加载和解析逻辑封装到一个独立的异步函数中，使 _ready 更清晰。
func _load_and_parse_formulas() -> void:
	var event_stage_resource = load("uid://dohpsb4jttuv1") as DialogueResource
	if not event_stage_resource:
		printerr("[EventManager] Failed to load event stage resource (uid://dohpsb4jttuv1).")
		return

	print("[EventManager] Refreshing event formulas...")
	for title in event_stage_resource.get_titles():
		# 使用 await 等待异步函数 get_lines 完成
		var lines = await Util.get_lines(event_stage_resource, title)
		for line in lines:
			var line_text: String = line.text.strip_edges()
			# 跳过注释行和不包含"->"的行
			if line_text.begins_with("#") or not "->" in line_text:
				continue
			_build_and_add_formula(line_text)
	print("[EventManager] Formula refreshing completed.")


# 解析单行规则，构建公式并添加到字典中。
# 示例: "c03_invite_xchan_supper=2 & c03_laizi_braid=2 -> c03_f2_madman_runaway=2"
func _build_and_add_formula(line_text: String) -> void:
	var parts: PackedStringArray = line_text.split("->")
	if parts.size() != 2:
		printerr("[EventManager] Invalid formula line (must contain one '->'): %s" % line_text)
		return

	var condition_events: Array[StringName] = []
	var condition_callable := _build_condition(parts[0], condition_events)
	var execution_callable := _build_execution(parts[1])

	# 关键的健壮性检查：确保条件和执行都成功构建
	if not condition_callable.is_valid() or not execution_callable.is_valid():
		printerr("[EventManager] Failed to build formula due to invalid parts from line: %s" % line_text)
		return

	var formula := func():
		if condition_callable.call():
			if Engine.is_editor_hint() or GlobalConfig.DEBUG:
				print("[EventManager] Formula condition met, executing: ", line_text)
			execution_callable.call()

	if Engine.is_editor_hint() or GlobalConfig.DEBUG:
		print("[EventManager] Built formula from: ", line_text)

	for event_name in condition_events:
		if not formula_dict.has(event_name):
			formula_dict[event_name] = []
		formula_dict[event_name].append(formula)
		if Engine.is_editor_hint() or GlobalConfig.DEBUG:
			print("[EventManager] Added formula for event: ", event_name)


# 构建条件 Callable。重构为迭代，而不是递归，以提高清晰度和健壮性。
# 示例: "c03_invite_xchan_supper=2 & c03_laizi_braid=2"
func _build_condition(text: String, r_condition_events: Array[StringName]) -> Callable:
	var condition_text := text.strip_edges()
	if condition_text.is_empty():
		return func(): return true # 空条件始终为真

	var sub_conditions: Array[Callable] = []
	# 按 "&" 分割所有子条件
	for part in condition_text.split("&"):
		var single_condition_text := part.strip_edges()
		if single_condition_text.is_empty():
			continue # 忽略由 "&&" 或末尾 "&" 产生的空部分

		var args := single_condition_text.split("=", false, 1)
		if args.size() != 2 or args[0].strip_edges().is_empty():
			printerr("[EventManager] Invalid condition part (format: 'event=value'): %s" % single_condition_text)
			continue # 跳过此错误部分，继续解析下一个

		var event_name_str := args[0].strip_edges()
		var value_str := args[1].strip_edges()

		if not value_str.is_valid_int():
			printerr("[EventManager] Invalid integer value in condition: %s" % single_condition_text)
			continue # 跳过

		var event_name := StringName(event_name_str)
		var target_value := value_str.to_int()

		if not r_condition_events.has(event_name):
			r_condition_events.append(event_name)

		sub_conditions.append(func(): return get_stage(event_name) == target_value)

	if sub_conditions.is_empty():
		printerr("[EventManager] No valid conditions were parsed from text: ", text)
		return Callable() # 返回无效 Callable，表示构建失败

	# 返回一个复合 Callable，它会检查所有子条件是否都为真
	return func():
		for sub_condition in sub_conditions:
			if not sub_condition.call():
				return false # 短路：任何一个为假，则整个条件为假
		return true # 所有子条件都为真


# 构建执行 Callable。增加了健壮性检查。
# 示例: "c03_f2_madman_runaway=2"
func _build_execution(text: String) -> Callable:
	var execution_text := text.strip_edges()
	var parts := execution_text.split("=", false, 1)

	if parts.size() != 2 or parts[0].strip_edges().is_empty():
		printerr("[EventManager] Invalid execution format (format: 'event=value'): %s" % execution_text)
		return Callable() # 返回无效 Callable

	var event_name_str := parts[0].strip_edges()
	var value_str := parts[1].strip_edges()

	if not value_str.is_valid_int():
		printerr("[EventManager] Invalid integer value in execution: %s" % execution_text)
		return Callable() # 返回无效 Callable

	var event_name := StringName(event_name_str)
	var target_value := value_str.to_int()

	# 使用 .bind() 是创建带参数 Callable 的首选方式，比手动包装一个 lambda 更清晰高效。
	return set_stage_if_greater.bind(event_name, target_value)

# --- 公共 API ---

func get_chapter_stage() -> int:
	return get_stage(&"current_chapter_stage")


func get_stage(event_name: StringName) -> int:
	if not ArchiveManager.archive or ArchiveManager.archive.event_stage == null:
		printerr("[EventManager] Archive or event_stage is null. Cannot get stage for '", event_name, "'.")
		return 0
	return ArchiveManager.archive.event_stage.get(event_name, 0)


# 核心的 stage 设置函数
# default 为 0，首次更新为 1
func set_stage(event_name: StringName, stage := 1) -> void:
	if not ArchiveManager.archive or ArchiveManager.archive.event_stage == null:
		printerr("[EventManager] Archive or event_stage is null. Cannot set stage for '", event_name, "'.")
		return
	ArchiveManager.archive.event_stage[event_name] = stage
	print("[EventManager] Stage updated: %s -> %s" % [event_name, stage])
	# 1. 发出通用信号
	stage_updated.emit(event_name, stage)
	# 2. 触发关联的公式
	if formula_dict.has(event_name):
		for formula in formula_dict.get(event_name, []):
			formula.call()


# 仅当设置的 stage > 当前 stage 时更新
func set_stage_if_greater(event_name: StringName, stage: int) -> bool:
	if stage > get_stage(event_name):
		set_stage(event_name, stage)
		return true
	return false


# stage 最大 99999
func next_stage(event_name: StringName, stage_max := 99999) -> int:
	var current_stage = get_stage(event_name)
	if current_stage < stage_max:
		var new_stage = current_stage + 1
		set_stage(event_name, new_stage)
		return new_stage
	return stage_max


# --- 游戏特定逻辑 ---
func _on_stage_updated_for_handnote(event_name: StringName, stage: int) -> void:
	# 检查条件是否满足
	if not (
		SceneManager.is_node_ready()
		and SceneManager.get_player()
		and SceneManager.get_player().character.begins_with("吕萍")
	):
		return

	if event_name.begins_with("handnote_"):
		# 笔记条目更新
		# 0 初始化隐藏，1 开始显示，2 划掉，3 结束隐藏
		if stage == 1:
			SceneManager.lock_player(3.0, 16, true)
			SceneManager.pop_notification("ui_notify_note_update")



##### 其他事件 #####


func prop_interacted(e_name, prop_key, interacted_times) -> void:
	print("Event: %s interacted with %s. total times: %s" % [e_name, prop_key, interacted_times])


##### TOOL 方法

# event_name -> {stages:PackedStringArray, update_time:int}
var _debug_event_stage_dict := {}


# return: stages
func get_event_stage_map_array(event_name: StringName) -> PackedStringArray:
	if not Engine.is_editor_hint():
		return PackedStringArray()
	var current_dict = _debug_event_stage_dict.get(event_name)
	var time_msec = Time.get_ticks_msec()
	# 3秒更新
	if current_dict and time_msec - current_dict["update_time"] < 3000:
		return current_dict["stages"]
	# 文件: res://asset/dialogue/event_stage.dialogue
	var event_stage_resource = load("uid://dohpsb4jttuv1") as DialogueResource
	print("[EventManager] get_event_stage_map_array refreshing...")
	for title in event_stage_resource.get_titles():
		var lines = await Util.get_lines(event_stage_resource, title)
		for line in lines:
			var line_text = line.text.strip_edges()
			var e_name = line.character
			if line_text.begins_with("#") or line_text.find("->") >= 0 or not e_name:
				continue
			#xxxx: 0:未开始 1:已偷听，需邀请 2:已完成邀请
			var parts = line_text.split(" ")
			var stages = PackedStringArray()
			for id in range(0, len(parts)):
				var tuple = parts[id].split(":")
				if len(tuple) == 2:
					var event_stage = int(tuple[0])
					if stages.size() < event_stage + 1:
						stages.resize(event_stage + 1)
					stages[event_stage] = tuple[1]
			for id in len(stages):
				if stages[id] == "":
					stages[id] = str(id)
			_debug_event_stage_dict[e_name] = {
				"stages": stages,
				"update_time": time_msec,
			}
	if _debug_event_stage_dict.has(event_name):
		prints("reload", event_name, "stages:", _debug_event_stage_dict[event_name]["stages"])
		return _debug_event_stage_dict[event_name]["stages"]
	return PackedStringArray()


# map stage_id->name, 必定保持相同长度的数组
func map_event_stages(
	event_name: StringName, stages: Array, including_id := true
) -> PackedStringArray:
	var result = PackedStringArray()
	result.resize(stages.size())
	var dict = await get_event_stage_map_array(event_name)
	for id in range(stages.size()):
		var stage = stages[id]
		if dict.size() > stage:
			if including_id:
				result[id] = str(stage) + ":" + dict[stage]
		else:
			result[id] = str(stage)
	return result