# wardrobe_transmog_system.gd —— Metin2 40250 装备外观幻化重塑与试衣间系统 1:1
# 对照 40250 服务端 item_transmutation.cpp, char_item.cpp
class_name WardrobeTransmogSystem
extends RefCounted

signal item_transmuted(target_slot: int, target_name: String, new_look_vnum: int, new_look_name: String)
signal transmutation_reverted(target_slot: int, item_name: String)

const VNUM_TRANSMOG_SCROLL   := 72301 # 幻化秘籍
const VNUM_REVERT_SCROLL     := 72302 # 幻化还原秘籍
const TRANSMOG_COST_GOLD     := 10000000 # 1000 万金币

# 装备大类
const TYPE_WEAPON  := 1
const TYPE_ARMOR   := 2
const TYPE_COSTUME := 28

# 试衣间预览外观效果 (不消耗物品)
func preview_transmog(target_item: Dictionary, skin_item: Dictionary) -> Dictionary:
	var val = _validate_compatibility(target_item, skin_item)
	if not val["ok"]:
		return val

	return {
		"ok": true,
		"base_vnum": target_item.get("vnum", 0),
		"base_name": target_item.get("name", "神装"),
		"preview_vnum": skin_item.get("vnum", 0),
		"preview_name": skin_item.get("name", "幻化外观"),
		"msg": "试衣间预览生成完毕！"
	}

# 执行幻化外观重塑
func apply_transmutation(scroll_slot: int, target_slot: int, skin_slot: int, inventory: Array, player_data: Dictionary) -> Dictionary:
	if scroll_slot < 0 or scroll_slot >= inventory.size() or inventory[scroll_slot] == null:
		return {"ok": false, "reason": "INVALID_SCROLL_SLOT"}
	if target_slot < 0 or target_slot >= inventory.size() or inventory[target_slot] == null:
		return {"ok": false, "reason": "INVALID_TARGET_SLOT"}
	if skin_slot < 0 or skin_slot >= inventory.size() or inventory[skin_slot] == null:
		return {"ok": false, "reason": "INVALID_SKIN_SLOT"}

	if target_slot == skin_slot:
		return {"ok": false, "reason": "SAME_SLOT", "msg": "目标装备与外观装备不能为同一格子！"}

	var scroll = inventory[scroll_slot]
	if int(scroll.get("vnum", 0)) != VNUM_TRANSMOG_SCROLL:
		return {"ok": false, "reason": "NOT_A_TRANSMOG_SCROLL", "msg": "需要使用【幻化秘籍】(72301)！"}

	var target = inventory[target_slot]
	var skin = inventory[skin_slot]

	var comp_check = _validate_compatibility(target, skin)
	if not comp_check["ok"]:
		return comp_check

	var gold = int(player_data.get("gold", 0))
	if gold < TRANSMOG_COST_GOLD:
		return {"ok": false, "reason": "NOT_ENOUGH_GOLD", "msg": "幻化所需金币不足！需要 10,000,000 金币。"}

	# 扣除金币与卷轴
	player_data["gold"] = gold - TRANSMOG_COST_GOLD
	var sc_cnt = int(scroll.get("count", 1))
	if sc_cnt > 1:
		scroll["count"] = sc_cnt - 1
	else:
		inventory[scroll_slot] = null

	# 消耗外观材料装备
	var skin_vnum = int(skin.get("vnum", 0))
	var skin_name = skin.get("name", "外观")
	var sk_cnt = int(skin.get("count", 1))
	if sk_cnt > 1:
		skin["count"] = sk_cnt - 1
	else:
		inventory[skin_slot] = null

	# 赋予目标装备幻化外观 (所有基础属性、强化与灵石 100% 保留)
	target["transmog_vnum"] = skin_vnum
	target["transmog_name"] = skin_name

	var tname: String = target.get("name", "装备")
	item_transmuted.emit(target_slot, tname, skin_vnum, skin_name)

	return {
		"ok": true,
		"target_slot": target_slot,
		"target_name": tname,
		"transmog_vnum": skin_vnum,
		"transmog_name": skin_name,
		"msg": "幻化成功！【%s】披上了【%s】的华丽外观！" % [tname, skin_name]
	}

# 还原装备原生外观
func revert_transmutation(scroll_slot: int, target_slot: int, inventory: Array) -> Dictionary:
	if scroll_slot < 0 or scroll_slot >= inventory.size() or inventory[scroll_slot] == null:
		return {"ok": false, "reason": "INVALID_SCROLL_SLOT"}
	if target_slot < 0 or target_slot >= inventory.size() or inventory[target_slot] == null:
		return {"ok": false, "reason": "INVALID_TARGET_SLOT"}

	var scroll = inventory[scroll_slot]
	if int(scroll.get("vnum", 0)) != VNUM_REVERT_SCROLL:
		return {"ok": false, "reason": "NOT_A_REVERT_SCROLL", "msg": "需要使用【幻化还原秘籍】(72302)！"}

	var target = inventory[target_slot]
	if not target.has("transmog_vnum") or int(target.get("transmog_vnum", 0)) == 0:
		return {"ok": false, "reason": "NOT_TRANSMUTED", "msg": "该装备未曾幻化，无需还原！"}

	# 消耗还原卷轴
	var cnt = int(scroll.get("count", 1))
	if cnt > 1:
		scroll["count"] = cnt - 1
	else:
		inventory[scroll_slot] = null

	target.erase("transmog_vnum")
	target.erase("transmog_name")

	var tname: String = target.get("name", "装备")
	transmutation_reverted.emit(target_slot, tname)

	return {
		"ok": true,
		"target_slot": target_slot,
		"item_name": tname,
		"msg": "幻化已抹除！【%s】恢复为原生经典外观。" % tname
	}

# 校验外观类型兼容性
func _validate_compatibility(target: Dictionary, skin: Dictionary) -> Dictionary:
	if target.is_empty() or skin.is_empty():
		return {"ok": false, "reason": "EMPTY_DATA"}

	var t_type = int(target.get("type", 1))
	var s_type = int(skin.get("type", 1))

	# 武器只能幻化武器或时装武器外观；防具只能幻化防具或时装衣服
	if t_type == TYPE_WEAPON:
		if s_type != TYPE_WEAPON and s_type != TYPE_COSTUME:
			return {"ok": false, "reason": "TYPE_MISMATCH", "msg": "武器只能幻化武器或时装外观！"}
	elif t_type == TYPE_ARMOR:
		if s_type != TYPE_ARMOR and s_type != TYPE_COSTUME:
			return {"ok": false, "reason": "TYPE_MISMATCH", "msg": "防具衣服只能幻化衣服防具外观！"}
	else:
		return {"ok": false, "reason": "UNSUPPORTED_TYPE", "msg": "该装备部位暂不支持幻化外观。"}

	return {"ok": true}