# system_setting_system.gd —— Metin2 40250 音频视听与战斗选项系统 1:1
# 对照 40250 服务端与客户端 PythonSystem.cpp, uisystemoption.py, uigameoption.py
class_name SystemSettingSystem
extends RefCounted

signal setting_changed(setting_name: String, new_val: Variant)
signal pk_mode_changed(new_mode: int, mode_name: String)

enum PkMode {
	PEACE = 0,   # 和平
	REVENGE = 1, # 善恶 (仅可攻击负善恶红名)
	GUILD = 2,   # 阵营 (公会战保护)
	FREE = 3     # 自由 (无限制)
}

# 音频设置
var bgm_volume: float = 0.8:
	set(v):
		bgm_volume = clampf(v, 0.0, 1.0)
		setting_changed.emit("bgm_volume", bgm_volume)

var sfx_volume: float = 0.8:
	set(v):
		sfx_volume = clampf(v, 0.0, 1.0)
		setting_changed.emit("sfx_volume", sfx_volume)

var is_muted: bool = false:
	set(v):
		is_muted = v
		setting_changed.emit("is_muted", is_muted)

# 视距与画质设置
var camera_distance: float = 25.0:
	set(v):
		camera_distance = clampf(v, 15.0, 40.0)
		setting_changed.emit("camera_distance", camera_distance)

var fog_level: int = 1: # 0: 无, 1: 近, 2: 远
	set(v):
		fog_level = clampi(v, 0, 2)
		setting_changed.emit("fog_level", fog_level)

var shadow_quality: int = 1: # 0: 关, 1: 地面, 2: 全部
	set(v):
		shadow_quality = clampi(v, 0, 2)
		setting_changed.emit("shadow_quality", shadow_quality)

# 战斗飘字与标签显示
var show_damage_dealt: bool = true
var show_damage_received: bool = true
var show_critical_hit: bool = true
var show_monster_names: bool = true
var show_player_names: bool = true

# PK 模式
var current_pk_mode: int = PkMode.PEACE

# 设置 PK 模式
func set_pk_mode(mode: int) -> Dictionary:
	if mode < PkMode.PEACE or mode > PkMode.FREE:
		return {"ok": false, "reason": "INVALID_PK_MODE", "msg": "无效的 PK 模式！"}

	current_pk_mode = mode
	var mname := get_pk_mode_name(mode)
	pk_mode_changed.emit(mode, mname)

	return {
		"ok": true,
		"mode": mode,
		"mode_name": mname,
		"msg": "PK 模式已切换为【%s】！" % mname
	}

# 获取模式中文名称
func get_pk_mode_name(mode: int) -> String:
	match mode:
		PkMode.PEACE: return "和平模式"
		PkMode.REVENGE: return "善恶反击模式"
		PkMode.GUILD: return "阵营公会模式"
		PkMode.FREE: return "自由对决模式"
		_: return "未知模式"

# 判定是否可以对指定目标发起攻击 (PK 判定状态机)
func can_attack_target(
	target_is_player: bool,
	target_alignment: int = 0,
	target_guild_id: int = 0,
	my_guild_id: int = 0
) -> bool:
	# 怪物/NPC 永远可以攻击
	if not target_is_player:
		return true

	# 玩家间攻击依据 PK 模式判定
	match current_pk_mode:
		PkMode.PEACE:
			# 和平模式：严禁攻击任何玩家
			return false

		PkMode.REVENGE:
			# 善恶模式：只可攻击红名玩家 (善恶值 < 0)
			return target_alignment < 0

		PkMode.GUILD:
			# 阵营模式：同公会玩家受到保护，禁止攻击
			if my_guild_id > 0 and target_guild_id > 0 and my_guild_id == target_guild_id:
				return false
			return true

		PkMode.FREE:
			# 自由模式：可攻击任何玩家
			return true

		_:
			return false

# 导出配置项
func export_settings() -> Dictionary:
	return {
		"bgm_volume": bgm_volume,
		"sfx_volume": sfx_volume,
		"is_muted": is_muted,
		"camera_distance": camera_distance,
		"fog_level": fog_level,
		"shadow_quality": shadow_quality,
		"show_damage_dealt": show_damage_dealt,
		"show_damage_received": show_damage_received,
		"show_critical_hit": show_critical_hit,
		"show_monster_names": show_monster_names,
		"show_player_names": show_player_names,
		"current_pk_mode": current_pk_mode
	}

# 导入配置项
func import_settings(cfg: Dictionary) -> void:
	if cfg.has("bgm_volume"): bgm_volume = float(cfg["bgm_volume"])
	if cfg.has("sfx_volume"): sfx_volume = float(cfg["sfx_volume"])
	if cfg.has("is_muted"): is_muted = bool(cfg["is_muted"])
	if cfg.has("camera_distance"): camera_distance = float(cfg["camera_distance"])
	if cfg.has("fog_level"): fog_level = int(cfg["fog_level"])
	if cfg.has("shadow_quality"): shadow_quality = int(cfg["shadow_quality"])
	if cfg.has("show_damage_dealt"): show_damage_dealt = bool(cfg["show_damage_dealt"])
	if cfg.has("show_damage_received"): show_damage_received = bool(cfg["show_damage_received"])
	if cfg.has("show_critical_hit"): show_critical_hit = bool(cfg["show_critical_hit"])
	if cfg.has("show_monster_names"): show_monster_names = bool(cfg["show_monster_names"])
	if cfg.has("show_player_names"): show_player_names = bool(cfg["show_player_names"])
	if cfg.has("current_pk_mode"): set_pk_mode(int(cfg["current_pk_mode"]))