# private_shop_system.gd —— 个人私有商店摆摊系统（40250 官方 1:1 对齐）
# 对齐源码：
#   - 40250 server/game/src/char_item.cpp (ITEM_BUNDLE 50200, OpenMyShop)
#   - 40250 root/uiprivateshopbuilder.py (PrivateShopBuilder)
#   - 40250 uiscript/privateshopbuilder.py (40 格摊位格)
class_name PrivateShopSystem
extends RefCounted

const VNUM_ITEM_BUNDLE := 50200       # 束发包袱皮
const VNUM_SHOP_HOST_STALL := 30000   # 摆摊木箱/桌子外观模型 Vnum
const PRIVATE_SHOP_SLOTS_MAX := 39    # 官方上限 39 件商品
const SIGN_LENGTH_MAX := 25           # 摊位招牌字数上限

## 检查物品是否为包袱皮
static func is_bundle(vnum: int) -> bool:
	return vnum == VNUM_ITEM_BUNDLE

## 校验是否能开店 (40250 官方前置条件：非战斗、非骑乘、非死亡)
static func can_open_private_shop(is_fighting: bool, is_mounted: bool, is_dead: bool) -> Dictionary:
	if is_dead:
		return {"ok": false, "code": "CANNOT_DEAD", "msg": "死亡状态下无法摆摊！"}
	if is_mounted:
		return {"ok": false, "code": "CANNOT_MOUNTED", "msg": "骑乘状态下无法摆摊，请先下马！"}
	if is_fighting:
		return {"ok": false, "code": "CANNOT_FIGHTING", "msg": "战斗中无法摆摊！"}
	return {"ok": true}

## 校验摊位招牌名称
static func validate_sign(sign_text: String) -> Dictionary:
	var trimmed := sign_text.strip_edges()
	if trimmed.is_empty():
		return {"ok": false, "code": "SIGN_EMPTY", "msg": "请输入有效的摊位名称！"}
	if trimmed.length() > SIGN_LENGTH_MAX:
		return {"ok": false, "code": "SIGN_TOO_LONG", "msg": "摊位名称不能超过 25 个字符！"}
	return {"ok": true, "sign": trimmed}

## 验证并将物品上架到摊位
static func add_item_to_stock(stock_dict: Dictionary, slot_idx: int, inv_item: Dictionary, price: int) -> Dictionary:
	if slot_idx < 0 or slot_idx >= PRIVATE_SHOP_SLOTS_MAX:
		return {"ok": false, "code": "INVALID_SLOT", "msg": "无效的摊位格子！"}
	if price <= 0:
		return {"ok": false, "code": "INVALID_PRICE", "msg": "出售价格必须大于 0 金币！"}
	if stock_dict.size() >= PRIVATE_SHOP_SLOTS_MAX and not stock_dict.has(slot_idx):
		return {"ok": false, "code": "SHOP_FULL", "msg": "摊位已达到最大商品容量 (39 件)！"}
	
	var cell := int(inv_item.get("cell", -1))
	var vnum := int(inv_item.get("vnum", 0))
	var count := int(inv_item.get("count", 1))
	
	stock_dict[slot_idx] = {
		"slot": slot_idx,
		"cell": cell,
		"vnum": vnum,
		"count": count,
		"price": price,
	}
	return {
		"ok": true,
		"code": "SUCCESS",
		"slot": slot_idx,
		"price": price,
		"msg": "商品成功上架到摊位第 %d 格，单价 %d 金币。" % [slot_idx + 1, price]
	}

## 撤下摊位商品
static func remove_item_from_stock(stock_dict: Dictionary, slot_idx: int) -> bool:
	if stock_dict.has(slot_idx):
		stock_dict.erase(slot_idx)
		return true
	return false

## 开市创建摆摊实体
static func build_private_shop(sign_text: String, stock_dict: Dictionary, stall_pos: Vector3) -> Dictionary:
	var v_sign := validate_sign(sign_text)
	if not bool(v_sign.get("ok", false)):
		return v_sign
	if stock_dict.is_empty():
		return {"ok": false, "code": "NO_ITEMS", "msg": "摊位上没有任何商品，无法开市！"}
	
	return {
		"ok": true,
		"code": "SHOP_OPENED",
		"stall_vnum": VNUM_SHOP_HOST_STALL,
		"sign": v_sign.get("sign", ""),
		"items_count": stock_dict.size(),
		"position": stall_pos,
		"msg": "【%s】正式开市！摊位已在当前位置建立。" % v_sign.get("sign", "")
	}