# epic_refine_system.gd —— Metin2 40250 修元平史诗级神装升阶转换锻造 1:1
# 对照 40250 服务端 refine.cpp, char_item.cpp, NPC 20091 (修元平 Seon-Pyeong)
class_name EpicRefineSystem
extends RefCounted

signal epic_refine_succeeded(old_vnum: int, new_vnum: int, item_data: Dictionary)
signal epic_refine_failed(reason: String)

const NPC_SEON_PYEONG := 20091

const ITEM_DRAGON_SCALE := 71123 # 龙鳞
const ITEM_DRAGON_CLAW := 71129  # 龙爪
const REQUIRED_SCALE_COUNT := 3
const REQUIRED_CLAW_COUNT := 4
const REQUIRED_YANG := 200000

# 官方 40250 经典史诗升阶配方表
const EPIC_RECIPES: Dictionary = {
	# 武器篇：65 级 +9 武器 -> 80~90 级 +0 史诗神兵
	169: {
		"target_vnum": 279,
		"name": "崔顿之剑+0",
		"desc": "战神之剑+9 升阶为 崔顿之剑+0"
	},
	3159: {
		"target_vnum": 3209,
		"name": "神圣之剑+0",
		"desc": "鬼牙刃+9 升阶为 神圣之剑+0"
	},
	1109: {
		"target_vnum": 1139,
		"name": "太阳之刃+0",
		"desc": "党人斧+9 升阶为 太阳之刃+0"
	},
	1119: {
		"target_vnum": 1129,
		"name": "龙神刀+0",
		"desc": "龙刀+9 升阶为 龙神刀+0"
	},
	2149: {
		"target_vnum": 2159,
		"name": "巨鸦弓+0",
		"desc": "黄龙弓+9 升阶为 巨鸦弓+0"
	},
	5109: {
		"target_vnum": 5119,
		"name": "恶魔之杖+0",
		"desc": "救赎之杖+9 升阶为 恶魔之杖+0"
	},
	# 铠甲篇：66 级 +9 黑钢铠甲 -> 90 级 +0 蓝钢铠甲
	11299: {
		"target_vnum": 12019,
		"name": "蓝钢甲+0",
		"desc": "黑钢甲+9 升阶为 蓝钢甲+0"
	},
	11499: {
		"target_vnum": 12029,
		"name": "蓝风甲+0",
		"desc": "黑风甲+9 升阶为 蓝风甲+0"
	},
	11699: {
		"target_vnum": 12039,
		"name": "蓝仙袍+0",
		"desc": "黑仙袍+9 升阶为 蓝仙袍+0"
	},
	11899: {
		"target_vnum": 12049,
		"name": "蓝龙袍+0",
		"desc": "黑龙袍+9 升阶为 蓝龙袍+0"
	}
}

# 判定物品是否可进行史诗升阶
func can_epic_refine(item: Dictionary) -> bool:
	if item.is_empty():
		return false
	var vnum: int = int(item.get("vnum", 0))
	return EPIC_RECIPES.has(vnum)

# 获取升阶配方详情
func get_recipe(vnum: int) -> Dictionary:
	return EPIC_RECIPES.get(vnum, {})

# 执行史诗装备升阶转换锻造
func do_epic_refine(
	target_slot: int,
	inventory: Array,
	player_data: Dictionary
) -> Dictionary:
	if target_slot < 0 or target_slot >= inventory.size():
		return {"ok": false, "reason": "INVALID_SLOT", "msg": "无效的装备栏位！"}

	var base_item = inventory[target_slot]
	if base_item == null:
		return {"ok": false, "reason": "EMPTY_SLOT", "msg": "该格子上没有装备！"}

	# 安全锁拦截
	if base_item.get("is_locked", false):
		return {"ok": false, "reason": "ITEM_LOCKED", "msg": "已加锁的装备无法进行史诗锻造！"}

	var base_vnum: int = int(base_item.get("vnum", 0))
	if not EPIC_RECIPES.has(base_vnum):
		return {"ok": false, "reason": "NOT_AN_EPIC_BASE_ITEM", "msg": "该物品无法进行修元平史诗升阶！"}

	var recipe: Dictionary = EPIC_RECIPES[base_vnum]

	# 1. 检查金币 (Yang)
	var current_yang: int = int(player_data.get("gold", 0))
	if current_yang < REQUIRED_YANG:
		return {
			"ok": false,
			"reason": "INSUFFICIENT_YANG",
			"required_yang": REQUIRED_YANG,
			"current_yang": current_yang,
			"msg": "史诗锻造需要 200,000 金币！你的金币不足。"
		}

	# 2. 统计并收集龙鳞与龙爪
	var scale_slots: Array = []
	var claw_slots: Array = []
	var total_scales: int = 0
	var total_claws: int = 0

	for i in range(inventory.size()):
		var item = inventory[i]
		if item == null:
			continue
		var v: int = int(item.get("vnum", 0))
		var cnt: int = int(item.get("count", 1))
		if v == ITEM_DRAGON_SCALE:
			total_scales += cnt
			scale_slots.append({"slot": i, "count": cnt})
		elif v == ITEM_DRAGON_CLAW:
			total_claws += cnt
			claw_slots.append({"slot": i, "count": cnt})

	if total_scales < REQUIRED_SCALE_COUNT:
		return {
			"ok": false,
			"reason": "MISSING_DRAGON_SCALES",
			"required": REQUIRED_SCALE_COUNT,
			"current": total_scales,
			"msg": "史诗锻造需要 3 个龙鳞！当前只有 %d 个。" % total_scales
		}

	if total_claws < REQUIRED_CLAW_COUNT:
		return {
			"ok": false,
			"reason": "MISSING_DRAGON_CLAWS",
			"required": REQUIRED_CLAW_COUNT,
			"current": total_claws,
			"msg": "史诗锻造需要 4 个龙爪！当前只有 %d 个。" % total_claws
		}

	# 3. 扣除金币
	player_data["gold"] = current_yang - REQUIRED_YANG

	# 4. 扣除材料 (龙鳞 3, 龙爪 4)
	_consume_materials(inventory, scale_slots, REQUIRED_SCALE_COUNT)
	_consume_materials(inventory, claw_slots, REQUIRED_CLAW_COUNT)

	# 5. 生成新史诗装备，1:1 完整继承 5 条附加属性与已镶嵌灵石！
	var new_vnum: int = recipe["target_vnum"]
	var inherited_attrs: Array = []
	if base_item.has("attributes"):
		for attr in base_item["attributes"]:
			inherited_attrs.append(attr.duplicate())

	var inherited_sockets: Array = []
	if base_item.has("sockets"):
		for sock in base_item["sockets"]:
			inherited_sockets.append(sock)

	var epic_item: Dictionary = {
		"vnum": new_vnum,
		"name": recipe["name"],
		"count": 1,
		"attributes": inherited_attrs,
		"sockets": inherited_sockets,
		"socket_count": base_item.get("socket_count", 3),
		"is_locked": false
	}

	# 替换背包中原位置的装备
	inventory[target_slot] = epic_item

	epic_refine_succeeded.emit(base_vnum, new_vnum, epic_item)

	return {
		"ok": true,
		"old_vnum": base_vnum,
		"new_vnum": new_vnum,
		"item": epic_item,
		"msg": "恭喜！修元平大师成功将装备升阶锻造为【%s】！" % recipe["name"]
	}

# 辅助函数：按需从多个格子中扣除材料数量
func _consume_materials(inventory: Array, slots_info: Array, count_needed: int) -> void:
	var needed := count_needed
	for info in slots_info:
		var s: int = info["slot"]
		var have: int = info["count"]
		if have <= needed:
			needed -= have
			inventory[s] = null
		else:
			inventory[s]["count"] = have - needed
			needed = 0
		if needed <= 0:
			break