# polymorph_system.gd —— Metin2 40250 怪物变身球与变身术技能系统 1:1
# 对照 40250 服务端 polymorph.cpp, char_item.cpp (Item 70104, Skill 129 Polymorph)
class_name PolymorphSystem
extends RefCounted

signal polymorph_started(mob_vnum: int, duration: float)
signal polymorph_ended()

const ITEM_POLYMORPH_MARBLE := 70104
const SKILL_POLYMORPH := 129
const AFFECT_POLYMORPH := 220

# 经典变身怪物属性表 (mob_vnum -> 属性加成与基础设定)
const MOB_DATA: Dictionary = {
	101: {"name": "野猪", "atk": 45, "def": 20, "speed": 120},
	102: {"name": "野狼", "atk": 35, "def": 15, "speed": 135},
	110: {"name": "黑熊", "atk": 60, "def": 35, "speed": 110},
	114: {"name": "白虎", "atk": 85, "def": 40, "speed": 140},
	501: {"name": "流浪汉", "atk": 70, "def": 30, "speed": 125}
}

var is_polymorphed: bool = false
var current_mob_vnum: int = 0
var remaining_time: float = 0.0
var original_race: int = 0 # 0: 战男, 1: 忍女, 2: 修男, 3: 萨女等
var poly_skill_level: int = 1 # 1 ~ 40 (1~19 普通, 20~29 M1~M10, 30~39 G1~G10, 40 P)

# 变身属性收益缓存
var bonus_atk: int = 0
var bonus_def: int = 0
var bonus_speed: int = 0

# 计算变身持续时间 (秒)
static func get_duration_by_skill(level: int) -> float:
	if level >= 40: # P 级
		return 2100.0 # 35 分钟
	elif level >= 30: # G 级
		return 1500.0 # 25 分钟
	elif level >= 20: # M 级
		return 1200.0 # 20 分钟
	else:
		return 600.0 + (level * 20.0) # 10~16 分钟

func can_polymorph(player_dead: bool, player_mounted: bool) -> Dictionary:
	if player_dead:
		return {"ok": false, "reason": "PLAYER_DEAD", "msg": "死亡状态下无法变身！"}
	if player_mounted:
		return {"ok": false, "reason": "PLAYER_MOUNTED", "msg": "骑马状态下无法变身，请先下马！"}
	return {"ok": true}

# 使用变身球 (Item 70104) 变身
func use_polymorph_marble(item: Dictionary, player_dead: bool, player_mounted: bool, p_race: int = 0) -> Dictionary:
	var check = can_polymorph(player_dead, player_mounted)
	if not check["ok"]:
		return check

	var vnum: int = int(item.get("vnum", 0))
	if vnum != ITEM_POLYMORPH_MARBLE:
		return {"ok": false, "reason": "NOT_A_MARBLE", "msg": "这不是变身球！"}

	var mob_vnum: int = int(item.get("mob_vnum", 0))
	if mob_vnum == 0:
		# 从 socket[0] 读
		var sockets: Array = item.get("sockets", [])
		if sockets.size() > 0:
			mob_vnum = int(sockets[0])

	if mob_vnum == 0 or not MOB_DATA.has(mob_vnum):
		# 默认野猪 101
		mob_vnum = 101

	original_race = p_race
	current_mob_vnum = mob_vnum
	is_polymorphed = true
	remaining_time = get_duration_by_skill(poly_skill_level)

	# 结算属性加成 (char_item.cpp)
	var mdata: Dictionary = MOB_DATA[mob_vnum]
	var skill_multiplier: float = 1.0 + (float(poly_skill_level) * 0.025)
	bonus_atk = int(round(float(mdata["atk"]) * skill_multiplier))
	bonus_def = int(mdata["def"])
	bonus_speed = int(mdata["speed"])

	polymorph_started.emit(current_mob_vnum, remaining_time)

	return {
		"ok": true,
		"mob_vnum": current_mob_vnum,
		"mob_name": mdata["name"],
		"duration": remaining_time,
		"bonus_atk": bonus_atk,
		"bonus_def": bonus_def,
		"bonus_speed": bonus_speed
	}

# 变身状态限制检查 1:1
func can_use_skill(skill_id: int) -> bool:
	# 变身中禁止施放人物主动职业技能
	if is_polymorphed:
		# 变身术本身、被动或马术/公共技能除外，职业技能一律拦截
		if skill_id != SKILL_POLYMORPH and skill_id < 100:
			return false
	return true

func can_change_weapon() -> bool:
	# 变身中禁止切换武器 (equip_rules.gd:316)
	return not is_polymorphed

func can_mount() -> bool:
	# 变身中禁止骑马
	return not is_polymorphed

# 逐帧更新倒计时
func update(dt: float) -> void:
	if not is_polymorphed:
		return

	remaining_time -= dt
	if remaining_time <= 0.0:
		cancel_polymorph()

# 取消/解除变身
func cancel_polymorph() -> void:
	if not is_polymorphed:
		return

	is_polymorphed = false
	current_mob_vnum = 0
	remaining_time = 0.0
	bonus_atk = 0
	bonus_def = 0
	bonus_speed = 0

	polymorph_ended.emit()

func on_player_death() -> void:
	if is_polymorphed:
		cancel_polymorph()

func get_state() -> Dictionary:
	return {
		"is_polymorphed": is_polymorphed,
		"mob_vnum": current_mob_vnum,
		"remaining_time": remaining_time,
		"poly_skill_level": poly_skill_level,
		"bonus_atk": bonus_atk,
		"bonus_def": bonus_def,
		"bonus_speed": bonus_speed
	}