# 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)

const DEFAULT_ITEM_SALE_UNIT_PRICE := 100 # 默认单件基础回收金币

# 堆叠精准拆分 (Shift + 左键)
func split_item(
	source_slot: int,
	split_count: int,
	target_slot: int,
	inventory: Array
) -> 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！"}

	# 执行拆分
	source_item["count"] = current_count - split_count

	var new_stack = source_item.duplicate(true)
	new_stack["count"] = split_count
	inventory[dest_slot] = new_stack

	item_split.emit(source_slot, dest_slot, split_count)

	return {
		"ok": true,
		"source_slot": source_slot,
		"target_slot": dest_slot,
		"remaining_source": source_item["count"],
		"split_count": split_count,
		"msg": "成功拆分出 %d 件物品！" % split_count
	}

# 快捷批量出售给商人 (Ctrl + 右键)
func quick_sell_item(
	slot_idx: int,
	inventory: Array,
	player_data: Dictionary
) -> 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！"}

	var count: int = int(item.get("count", 1))
	var unit_price: int = int(item.get("sale_price", DEFAULT_ITEM_SALE_UNIT_PRICE))
	var total_gold := unit_price * count

	# 增加金币并清空格子
	player_data["gold"] = int(player_data.get("gold", 0)) + total_gold
	var iname: String = item.get("name", "物品")
	inventory[slot_idx] = null

	item_quick_sold.emit(slot_idx, total_gold, iname)

	return {
		"ok": true,
		"slot_idx": slot_idx,
		"gold_received": total_gold,
		"item_name": iname,
		"msg": "已快捷出售【%s x%d】，获得 %d 金币！" % [iname, count, total_gold]
	}

# 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
	}