mtgodot-poc/project/portable_service_system.gd

# portable_service_system.gd —— Metin2 40250 随身便民道具与即时服务系统 1:1
# 对照 40250 服务端 char_item.cpp, cmd_general.cpp, Items 70005, 70006, 70007
class_name PortableServiceSystem
extends RefCounted

signal service_opened(service_type: String)
signal portable_item_consumed(vnum: int, remaining: int)

const ITEM_PORTABLE_SAFEBOX := 70005        # 随身仓库卷轴
const ITEM_PORTABLE_BLACKSMITH := 70006     # 随身铁匠手稿
const ITEM_PORTABLE_GENERAL_STORE := 70007  # 随身杂货铺契约

# 随身杂货铺基础货架商品列表 (大红、大蓝、加速药水、回城卷轴)
const PORTABLE_STORE_GOODS: Array = [
	{"vnum": 27003, "name": "红药水(大)", "price": 3200, "count": 200},
	{"vnum": 27006, "name": "蓝药水(大)", "price": 4800, "count": 200},
	{"vnum": 27102, "name": "绿药水(大)", "price": 10000, "count": 10},
	{"vnum": 22000, "name": "回城卷轴", "price": 2000, "count": 1}
]

var active_service: String = "" # "safebox", "blacksmith", "store", or ""

# 使用随身仓库 (70005)
func use_portable_safebox(slot_idx: int, inventory: Array) -> Dictionary:
	var consume_res := _consume_portable_item(slot_idx, inventory, ITEM_PORTABLE_SAFEBOX)
	if not consume_res["ok"]:
		return consume_res

	active_service = "safebox"
	service_opened.emit("safebox")

	return {
		"ok": true,
		"service": "safebox",
		"remaining_scrolls": consume_res["remaining"],
		"msg": "使用了【随身仓库卷轴】，已建立与城市货郎的远程仓库连接！"
	}

# 使用随身铁匠 (70006)
func use_portable_blacksmith(slot_idx: int, inventory: Array) -> Dictionary:
	var consume_res := _consume_portable_item(slot_idx, inventory, ITEM_PORTABLE_BLACKSMITH)
	if not consume_res["ok"]:
		return consume_res

	active_service = "blacksmith"
	service_opened.emit("blacksmith")

	return {
		"ok": true,
		"service": "blacksmith",
		"remaining_scrolls": consume_res["remaining"],
		"msg": "展开了【随身铁匠手稿】，便携精炼锻造炉已点燃！随时可强化装备！"
	}

# 使用随身杂货铺 (70007)
func use_portable_store(slot_idx: int, inventory: Array) -> Dictionary:
	var consume_res := _consume_portable_item(slot_idx, inventory, ITEM_PORTABLE_GENERAL_STORE)
	if not consume_res["ok"]:
		return consume_res

	active_service = "store"
	service_opened.emit("store")

	return {
		"ok": true,
		"service": "store",
		"goods": PORTABLE_STORE_GOODS.duplicate(true),
		"remaining_scrolls": consume_res["remaining"],
		"msg": "出示了【随身杂货铺契约】，随身货郎已赶来！随时可补给药水或出售垃圾！"
	}

# 从随身杂货铺购买商品
func buy_goods_from_portable_store(
	goods_idx: int,
	player_data: Dictionary,
	inventory: Array
) -> Dictionary:
	if active_service != "store":
		return {"ok": false, "reason": "STORE_NOT_OPEN", "msg": "随身杂货铺尚未开启！"}

	if goods_idx < 0 or goods_idx >= PORTABLE_STORE_GOODS.size():
		return {"ok": false, "reason": "INVALID_GOODS", "msg": "商品不存在！"}

	var goods: Dictionary = PORTABLE_STORE_GOODS[goods_idx]
	var price: int = int(goods["price"])
	var current_gold: int = int(player_data.get("gold", 0))

	if current_gold < price:
		return {
			"ok": false,
			"reason": "INSUFFICIENT_YANG",
			"price": price,
			"current_gold": current_gold,
			"msg": "金币不足，无法购买！"
		}

	# 寻找背包空位
	var empty_slot := -1
	for i in range(inventory.size()):
		if inventory[i] == null:
			empty_slot = i
			break

	if empty_slot == -1:
		return {"ok": false, "reason": "INVENTORY_FULL", "msg": "背包已满，无法容纳所购商品！"}

	# 扣费并放入物品
	player_data["gold"] = current_gold - price
	inventory[empty_slot] = {
		"vnum": goods["vnum"],
		"name": goods["name"],
		"count": goods.get("count", 1)
	}

	return {
		"ok": true,
		"item": inventory[empty_slot],
		"slot": empty_slot,
		"remaining_gold": player_data["gold"],
		"msg": "成功购买【%s】！" % goods["name"]
	}

# 关闭随身服务窗口
func close_service() -> void:
	active_service = ""

# 内部通用道具消耗处理
func _consume_portable_item(slot_idx: int, inventory: Array, expected_vnum: int) -> Dictionary:
	if slot_idx < 0 or slot_idx >= inventory.size():
		return {"ok": false, "reason": "INVALID_SLOT"}

	var item = inventory[slot_idx]
	if item == null or int(item.get("vnum", 0)) != expected_vnum:
		return {"ok": false, "reason": "ITEM_MISMATCH", "msg": "该格子上不是对应的随身卷轴！"}

	var cnt: int = int(item.get("count", 1))
	var remaining: int = cnt - 1
	if remaining <= 0:
		inventory[slot_idx] = null
	else:
		item["count"] = remaining

	portable_item_consumed.emit(expected_vnum, remaining)

	return {"ok": true, "remaining": remaining}