mtgodot-poc/project/event_manager_system.gd

# event_manager_system.gd —— Metin2 40250 单人模式全服掉落活动与倍率调度器 1:1
# 对照 40250 服务端 cmd_gm.cpp (do_priv_empire), priv_manager.cpp, event.cpp, Items 50011, 50037
class_name EventManagerSystem
extends RefCounted

signal rate_changed(rate_type: String, multiplier: float)
signal event_state_changed(event_name: String, is_active: bool)
signal event_box_dropped(box_vnum: int, box_name: String)

const ITEM_MOONLIGHT_BOX := 50011   # 月光宝盒
const ITEM_HEXAGONAL_BOX := 50037   # 六角宝盒

# 宝盒奖励奖池 (40250 官方 special_item_group.txt 1:1)
const EVENT_BOX_LOOT: Dictionary = {
	50011: [
		{"vnum": 25040, "name": "祝福卷轴", "count": 1, "weight": 30},
		{"vnum": 71084, "name": "高级附魔石", "count": 1, "weight": 25},
		{"vnum": 71085, "name": "高级洗练石", "count": 1, "weight": 25},
		{"vnum": 70024, "name": "祝福大理石", "count": 1, "weight": 10},
		{"vnum": 72723, "name": "月之灵药(特)", "count": 1, "weight": 10}
	],
	50037: [
		{"vnum": 72001, "name": "经验之戒", "count": 1, "weight": 20},
		{"vnum": 72002, "name": "盗贼手套", "count": 1, "weight": 20},
		{"vnum": 27102, "name": "绿药水(大)", "count": 5, "weight": 30},
		{"vnum": 27105, "name": "紫药水(大)", "count": 5, "weight": 30}
	]
}

var exp_rate: float = 1.0
var drop_rate: float = 1.0
var gold_rate: float = 1.0

var is_moonlight_active: bool = false
var is_hexagonal_active: bool = false

# 设置倍率 (exp, drop, gold)
func set_rate(rate_type: String, multiplier: float) -> Dictionary:
	if multiplier < 1.0 or multiplier > 5.0:
		return {"ok": false, "reason": "INVALID_MULTIPLIER", "msg": "倍率必须在 1.0 到 5.0 之间！"}

	match rate_type:
		"exp":
			exp_rate = multiplier
		"drop":
			drop_rate = multiplier
		"gold":
			gold_rate = multiplier
		_:
			return {"ok": false, "reason": "INVALID_RATE_TYPE", "msg": "未知的倍率类型！"}

	rate_changed.emit(rate_type, multiplier)

	return {
		"ok": true,
		"rate_type": rate_type,
		"multiplier": multiplier,
		"msg": "全服【%s】倍率已设置为 %.1fx！" % [rate_type.to_upper(), multiplier]
	}

# 开关经典限时掉落活动
func toggle_event(event_name: String, enable: bool) -> Dictionary:
	match event_name:
		"moonlight":
			is_moonlight_active = enable
		"hexagonal":
			is_hexagonal_active = enable
		_:
			return {"ok": false, "reason": "INVALID_EVENT_NAME", "msg": "未知的活动名称！"}

	event_state_changed.emit(event_name, enable)

	var state_str := "开启" if enable else "关闭"
	var ev_desc := "月光宝盒掉落狂欢" if event_name == "moonlight" else "六角宝盒冲级庆典"

	return {
		"ok": true,
		"event_name": event_name,
		"is_active": enable,
		"msg": "【%s】活动已%s！" % [ev_desc, state_str]
	}

# 怪物击杀时判定额外活动宝盒掉落
func check_event_drops(mob_level: int, player_level: int, forced_roll: float = -1.0) -> Array:
	var drops: Array = []

	# 等级差在 15 级以内才掉落活动宝盒
	if absi(mob_level - player_level) > 15:
		return drops

	# 1. 月光宝盒判定 (基础概率 10% * drop_rate)
	if is_moonlight_active:
		var chance := 0.10 * drop_rate
		var roll := forced_roll if forced_roll >= 0.0 else randf()
		if roll <= chance:
			drops.append({"vnum": ITEM_MOONLIGHT_BOX, "name": "月光宝盒", "count": 1})
			event_box_dropped.emit(ITEM_MOONLIGHT_BOX, "月光宝盒")

	# 2. 六角宝盒判定 (基础概率 15% * drop_rate)
	if is_hexagonal_active:
		var chance := 0.15 * drop_rate
		var roll := forced_roll if forced_roll >= 0.0 else randf()
		if roll <= chance:
			drops.append({"vnum": ITEM_HEXAGONAL_BOX, "name": "六角宝盒", "count": 1})
			event_box_dropped.emit(ITEM_HEXAGONAL_BOX, "六角宝盒")

	return drops

# 计算经倍率加成后的经验与金币
func calculate_exp(base_exp: int) -> int:
	return int(round(base_exp * exp_rate))

func calculate_gold(base_gold: int) -> int:
	return int(round(base_gold * gold_rate))

# 打开活动宝盒
func open_event_box(slot_idx: int, inventory: Array) -> Dictionary:
	if slot_idx < 0 or slot_idx >= inventory.size():
		return {"ok": false, "reason": "INVALID_SLOT", "msg": "无效的背包栏位！"}

	var box = inventory[slot_idx]
	if box == null:
		return {"ok": false, "reason": "EMPTY_SLOT", "msg": "该格子上没有物品！"}

	var box_vnum: int = int(box.get("vnum", 0))
	if not EVENT_BOX_LOOT.has(box_vnum):
		return {"ok": false, "reason": "NOT_AN_EVENT_BOX", "msg": "这不是活动宝盒！"}

	var pool: Array = EVENT_BOX_LOOT[box_vnum]

	# 权重抽奖
	var total_weight := 0
	for item in pool:
		total_weight += int(item.get("weight", 1))

	var roll := randi_range(1, total_weight)
	var accumulated := 0
	var reward: Dictionary = {}
	for item in pool:
		accumulated += int(item.get("weight", 1))
		if roll <= accumulated:
			reward = item.duplicate()
			break

	if reward.is_empty():
		reward = pool[0].duplicate()

	# 扣除宝盒，存入奖励
	var cnt: int = int(box.get("count", 1))
	if cnt <= 1:
		inventory[slot_idx] = null
	else:
		box["count"] = cnt - 1

	var stored_slot := -1
	for i in range(inventory.size()):
		if inventory[i] == null:
			inventory[i] = {
				"vnum": reward["vnum"],
				"name": reward["name"],
				"count": reward.get("count", 1)
			}
			stored_slot = i
			break

	return {
		"ok": true,
		"reward": reward,
		"stored_slot": stored_slot,
		"msg": "打开活动宝盒，获得了【%s x%d】！" % [reward["name"], reward.get("count", 1)]
	}