# spider_dungeon_system.gd —— Metin2 40250 蜘蛛洞穴三层与男爵夫人巢穴 1:1
# 对照 40250 服务端 spider_dungeon_3.quest, dungeon.cpp, Boss 2094 & Mob 2095
class_name SpiderDungeonSystem
extends RefCounted

signal dungeon_started(duration: float)
signal egg_destroyed(eggs_left: int, current_atk: int, current_def: int)
signal minions_summoned()
signal dungeon_cleared(drops: Array[Dictionary])
signal dungeon_failed(reason: String)

const NPC_GRAVESTONE := 20371       # 守墓人碑文
const ITEM_ARACHNID_KEY := 30327    # 蜘蛛之钥
const BOSS_SPIDER_BARONESS := 2094  # 蜘蛛男爵夫人
const MOB_SPIDER_EGG := 2095        # 蜘蛛卵
const ITEM_BARONESS_CHEST := 50157  # 男爵宝箱
const ITEM_TITAN_SHIELD := 13129    # 泰坦盾牌+9

const REQUIRED_LEVEL := 50
const DUNGEON_TIME_LIMIT := 1200.0  # 20 分钟 (秒)

const BASE_BARONESS_MAX_HP := 250000
const BASE_BARONESS_DEF := 400
const BASE_BARONESS_ATK := 800

var is_active: bool = false
var remaining_time: float = 0.0
var eggs_remaining: int = 4
var baroness_hp: int = 0
var baroness_max_hp: int = BASE_BARONESS_MAX_HP
var baroness_def: int = BASE_BARONESS_DEF
var baroness_atk: int = BASE_BARONESS_ATK
var minions_spawned: bool = false
var dungeon_completed: bool = false

# 开启地牢密室 (spider_dungeon_3.quest)
func enter_dungeon(player_level: int, inventory: Array) -> Dictionary:
	if is_active:
		return {"ok": false, "reason": "ALREADY_ACTIVE", "msg": "地牢密室已经在进行中！"}
	if player_level < REQUIRED_LEVEL:
		return {"ok": false, "reason": "LEVEL_TOO_LOW", "msg": "等级未满 50 级，无法承受蜘蛛巢穴的剧毒！"}

	# 查找并扣除蜘蛛之钥 (30327)
	var key_slot := -1
	for i in range(inventory.size()):
		var it = inventory[i]
		if it != null and int(it.get("vnum", 0)) == ITEM_ARACHNID_KEY:
			key_slot = i
			break

	if key_slot == -1:
		return {"ok": false, "reason": "MISSING_KEY", "msg": "进入蜘蛛男爵夫人巢穴需要消耗【蜘蛛钥匙】！"}

	inventory[key_slot] = null

	# 初始化地牢状态
	is_active = true
	remaining_time = DUNGEON_TIME_LIMIT
	eggs_remaining = 4
	baroness_max_hp = BASE_BARONESS_MAX_HP
	baroness_hp = baroness_max_hp
	baroness_def = BASE_BARONESS_DEF
	baroness_atk = BASE_BARONESS_ATK
	minions_spawned = false
	dungeon_completed = false

	dungeon_started.emit(remaining_time)

	return {
		"ok": true,
		"time_limit": remaining_time,
		"eggs_count": eggs_remaining,
		"baroness_hp": baroness_hp,
		"baroness_atk": baroness_atk,
		"baroness_def": baroness_def,
		"msg": "密室封印已破除！蜘蛛男爵夫人苏醒，你有 20 分钟时间击杀它！"
	}

# 击碎一枚蜘蛛卵 (狂暴激怒机制: 防御 -15%, 攻击 +20%)
func destroy_egg() -> Dictionary:
	if not is_active:
		return {"ok": false, "reason": "DUNGEON_NOT_ACTIVE"}
	if eggs_remaining <= 0:
		return {"ok": false, "reason": "NO_EGGS_LEFT", "msg": "所有蜘蛛卵均已被击碎！"}

	eggs_remaining -= 1
	var eggs_broken := 4 - eggs_remaining

	# 每碎 1 卵：防御降低 15% (最高 -60%), 攻击提升 20% (最高 +80%)
	var def_reduction_pct: float = float(eggs_broken) * 0.15
	var atk_bonus_pct: float = float(eggs_broken) * 0.20

	baroness_def = int(round(float(BASE_BARONESS_DEF) * (1.0 - def_reduction_pct)))
	baroness_atk = int(round(float(BASE_BARONESS_ATK) * (1.0 + atk_bonus_pct)))

	egg_destroyed.emit(eggs_remaining, baroness_atk, baroness_def)

	return {
		"ok": true,
		"eggs_left": eggs_remaining,
		"eggs_broken": eggs_broken,
		"baroness_def": baroness_def,
		"baroness_atk": baroness_atk,
		"msg": "蜘蛛卵被击碎！男爵夫人防御大幅削弱，但陷入了极度狂暴！"
	}

# 攻击男爵夫人
func damage_baroness(raw_damage: int) -> Dictionary:
	if not is_active:
		return {"ok": false, "reason": "DUNGEON_NOT_ACTIVE"}
	if dungeon_completed:
		return {"ok": false, "reason": "ALREADY_COMPLETED"}

	var eff_dmg: int = maxi(1, raw_damage - baroness_def)
	baroness_hp = maxi(0, baroness_hp - eff_dmg)

	# 50% 血量召唤蜘蛛群
	var triggered_minions := false
	if not minions_spawned and baroness_hp <= int(baroness_max_hp * 0.5):
		minions_spawned = true
		triggered_minions = true
		minions_summoned.emit()

	if baroness_hp <= 0:
		dungeon_completed = true
		is_active = false
		var drops: Array[Dictionary] = [
			{"vnum": ITEM_BARONESS_CHEST, "count": 1, "name": "男爵宝箱"},
			{"vnum": ITEM_TITAN_SHIELD, "count": 1, "name": "泰坦盾牌+9"}
		]
		dungeon_cleared.emit(drops)
		return {
			"ok": true,
			"dead": true,
			"baroness_hp": 0,
			"damage_dealt": eff_dmg,
			"drops": drops,
			"msg": "蜘蛛男爵夫人轰然倒地！巢穴通关！"
		}

	return {
		"ok": true,
		"dead": false,
		"baroness_hp": baroness_hp,
		"damage_dealt": eff_dmg,
		"minions_summoned": triggered_minions
	}

# 逐帧更新倒计时
func update(dt: float) -> Dictionary:
	if not is_active:
		return {}

	remaining_time -= dt
	if remaining_time <= 0.0:
		remaining_time = 0.0
		is_active = false
		dungeon_failed.emit("TIME_OUT")
		return {"failed": true, "reason": "TIME_OUT", "msg": "挑战超时！你已被移出蜘蛛男爵夫人巢穴！"}

	return {"failed": false, "remaining_time": remaining_time}