# item_split_system.gd —— Metin2 40250 物品堆叠精准拆分与快捷批量操作 1:1
# 对照 40250 服务端 char_item.cpp, input_main.cpp, uiinventory.py
class_name ItemSplitSystem
extends RefCounted

signal item_split(source_slot: int, target_slot: int, split_count: int)
signal item_quick_sold(slot_idx: int, gold_received: int, item_name: String)
signal item_split_requested(source_slot: int, target_slot: int, split_count: int)
signal item_quick_sell_requested(slot_idx: int, count: int, item_name: String)

# 堆叠精准拆分 (Shift + 左键)
func split_item(
	source_slot: int,
	split_count: int,
	target_slot: int,
	inventory: Array,
	client: Node = null,
	source_window: int = 1,
	target_window: int = 1
) -> Dictionary:
	if source_slot < 0 or source_slot >= inventory.size():
		return {"ok": false, "reason": "INVALID_SOURCE_SLOT", "msg": "无效的源栏位！"}

	var source_item = inventory[source_slot]
	if source_item == null:
		return {"ok": false, "reason": "EMPTY_SOURCE_SLOT", "msg": "源栏位上没有物品！"}

	var current_count: int = int(source_item.get("count", 1))
	if current_count <= 1:
		return {"ok": false, "reason": "NOT_SPLITTABLE", "msg": "单件物品无法拆分！"}

	if split_count < 1 or split_count >= current_count:
		return {
			"ok": false,
			"reason": "INVALID_SPLIT_COUNT",
			"max_allowed": current_count - 1,
			"msg": "拆分数量必须在 1 到 %d 之间！" % (current_count - 1)
		}

	# 确定目标格子
	var dest_slot := target_slot
	if dest_slot < 0:
		for i in range(inventory.size()):
			if inventory[i] == null:
				dest_slot = i
				break

	if dest_slot < 0 or dest_slot >= inventory.size():
		return {"ok": false, "reason": "NO_DEST_SLOT", "msg": "背包没有可用空位放置拆分出的物品！"}

	if inventory[dest_slot] != null:
		return {"ok": false, "reason": "DEST_SLOT_NOT_EMPTY", "msg": "目标栏位已被占用！"}

	# 40250 does not edit CPythonPlayer's item array optimistically. Splitting
	# is an ordinary CG_ITEM_MOVE(source, destination, count); both resulting
	# counts arrive later through GC_ITEM_UPDATE/SET. Keep this helper from
	# becoming a second local authority when it is used by desktop or mobile UI.
	if client == null or not client.has_method("move_item"):
		return {"ok": false, "reason": "NETWORK_CLIENT_REQUIRED", "msg": "拆分需要连接服务器确认！"}
	if not client.move_item(source_window, source_slot, target_window, dest_slot, split_count):
		return {"ok": false, "reason": "SEND_FAILED", "msg": "拆分请求发送失败！"}

	item_split_requested.emit(source_slot, dest_slot, split_count)

	return {
		"ok": true,
		"pending": true,
		"source_slot": source_slot,
		"target_slot": dest_slot,
		"remaining_source": current_count - split_count,
		"split_count": split_count,
		"msg": "已发送拆分请求，等待服务器确认！"
	}

# 快捷批量出售给商人 (Ctrl + 右键)
func quick_sell_item(
	slot_idx: int,
	inventory: Array,
	player_data: Dictionary,
	client: Node = null,
	window: int = 1
) -> Dictionary:
	if slot_idx < 0 or slot_idx >= inventory.size():
		return {"ok": false, "reason": "INVALID_SLOT", "msg": "无效的栏位！"}

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

	# 加锁保护
	if item.get("is_locked", false):
		return {"ok": false, "reason": "ITEM_LOCKED", "msg": "已加锁的物品严禁出售！"}
	if window != 1:
		return {"ok": false, "reason": "INVALID_SELL_WINDOW", "msg": "只能出售背包中的物品！"}

	var count: int = int(item.get("count", 1))
	# 40250's SELL/SELL2 response supplies the authoritative price and the
	# subsequent item/gold updates. Do not use sale_price/player_data as a local
	# substitute for the server result.
	if client == null or not client.has_method("shop_sell"):
		return {"ok": false, "reason": "NETWORK_CLIENT_REQUIRED", "msg": "出售需要连接服务器确认！"}
	if not client.shop_sell(slot_idx, count):
		return {"ok": false, "reason": "SEND_FAILED", "msg": "出售请求发送失败！"}

	var iname: String = item.get("name", "物品")
	item_quick_sell_requested.emit(slot_idx, count, iname)

	return {
		"ok": true,
		"pending": true,
		"slot_idx": slot_idx,
		"count": count,
		"item_name": iname,
		"msg": "已发送出售请求，等待服务器确认！"
	}

# 高价值物品丢弃/销毁防误触检查
func check_drop_safety(item: Dictionary) -> Dictionary:
	if item.is_empty():
		return {"can_drop": false}

	if item.get("is_locked", false):
		return {
			"can_drop": false,
			"require_confirm": false,
			"reason": "ITEM_LOCKED",
			"msg": "已加锁的贵重物品无法丢弃！"
		}

	var refine_level: int = int(item.get("refine_level", 0))
	var has_attrs: bool = item.has("attributes") and not item["attributes"].is_empty()

	if refine_level >= 7 or has_attrs:
		return {
			"can_drop": true,
			"require_confirm": true,
			"msg": "此装备强化等级较高或拥有附加属性，属于贵重装备！确定要丢弃吗？"
		}

	return {
		"can_drop": true,
		"require_confirm": false
	}