# status_skill_reset_system.gd —— Metin2 40250 官方属性重修卷轴与忘却之书洗点系统 1:1
# 对照 40250 服务端 char_item.cpp, char.cpp, root/uipointreset.py
class_name StatusSkillResetSystem
extends RefCounted

signal status_reset(stat_name: String, refunded_points: int)
signal all_status_reset(refunded_points: int)
signal skill_point_reset(skill_id: int, new_level: int)
signal all_skills_reset(refunded_points: int)

# 40250 官方重修道具 Vnum
const VNUM_SKILL_RESET_SCROLL       := 71001 # 技能重置卷轴 (全部技能洗点)
const VNUM_STATUS_REDIST_SCROLL     := 71002 # 属性重修卷轴 (单项四维属性洗点)
const VNUM_ALL_STATUS_RESET_SCROLL  := 71003 # 全属性重置卷轴 (血统重塑卷轴)

# 40250 四维职业初始基础属性标准表 (Lv 1 Base)
const JOB_BASE_STATS: Dictionary = {
	"warrior":  {"vit": 16, "int": 3,  "str": 15, "dex": 5},
	"assassin": {"vit": 14, "int": 3,  "str": 8,  "dex": 16},
	"sura":     {"vit": 15, "int": 16, "str": 8,  "dex": 3},
	"shaman":   {"vit": 15, "int": 16, "str": 5,  "dex": 6}
}

# 单项属性重修 (71002 属性重修卷轴)
func reset_single_status(stat_name: String, player_data: Dictionary, inventory: Array, item_slot: int) -> Dictionary:
	var valid_stats = ["vit", "int", "str", "dex"]
	if not valid_stats.has(stat_name):
		return {"ok": false, "reason": "INVALID_STAT_NAME", "msg": "无效的属性名称！"}
	
	if item_slot < 0 or item_slot >= inventory.size() or inventory[item_slot] == null:
		return {"ok": false, "reason": "INVALID_SLOT"}
	
	var item: Dictionary = inventory[item_slot]
	if int(item.get("vnum", 0)) != VNUM_STATUS_REDIST_SCROLL:
		return {"ok": false, "reason": "NOT_A_STATUS_REDIST_SCROLL", "msg": "需要使用【属性重修卷轴】(71002)！"}
	
	var job: String = str(player_data.get("job", "warrior"))
	var base_stat_table: Dictionary = JOB_BASE_STATS.get(job, JOB_BASE_STATS["warrior"])
	var base_val: int = int(base_stat_table.get(stat_name, 10))
	var cur_val: int = int(player_data.get(stat_name, base_val))
	
	if cur_val <= base_val:
		return {"ok": false, "reason": "STAT_ALREADY_AT_BASE", "msg": "该属性尚未分配任何点数，无需重置！"}
	
	var refunded: int = cur_val - base_val
	
	# 消耗 1 卷
	var cnt := int(item.get("count", 1))
	if cnt > 1:
		item["count"] = cnt - 1
	else:
		inventory[item_slot] = null
	
	player_data[stat_name] = base_val
	player_data["unused_status_points"] = int(player_data.get("unused_status_points", 0)) + refunded
	
	status_reset.emit(stat_name, refunded)
	
	return {
		"ok": true,
		"stat_name": stat_name,
		"refunded_points": refunded,
		"new_val": base_val,
		"total_unused": player_data["unused_status_points"],
		"msg": "成功重置【%s】，全额退还 %d 点属性点！" % [stat_name.to_upper(), refunded]
	}

# 全属性重置 (71003 全属性重置卷轴)
func reset_all_status(player_data: Dictionary, inventory: Array, item_slot: int) -> Dictionary:
	if item_slot < 0 or item_slot >= inventory.size() or inventory[item_slot] == null:
		return {"ok": false, "reason": "INVALID_SLOT"}
	
	var item: Dictionary = inventory[item_slot]
	if int(item.get("vnum", 0)) != VNUM_ALL_STATUS_RESET_SCROLL:
		return {"ok": false, "reason": "NOT_AN_ALL_STATUS_RESET_SCROLL", "msg": "需要使用【全属性重置卷轴】(71003)！"}
	
	var job: String = str(player_data.get("job", "warrior"))
	var base_stat_table: Dictionary = JOB_BASE_STATS.get(job, JOB_BASE_STATS["warrior"])
	
	var total_refunded := 0
	for stat_name in ["vit", "int", "str", "dex"]:
		var base_val: int = int(base_stat_table.get(stat_name, 10))
		var cur_val: int = int(player_data.get(stat_name, base_val))
		if cur_val > base_val:
			total_refunded += (cur_val - base_val)
		player_data[stat_name] = base_val
	
	# 消耗 1 卷
	var cnt := int(item.get("count", 1))
	if cnt > 1:
		item["count"] = cnt - 1
	else:
		inventory[item_slot] = null
	
	player_data["unused_status_points"] = int(player_data.get("unused_status_points", 0)) + total_refunded
	
	all_status_reset.emit(total_refunded)
	
	return {
		"ok": true,
		"refunded_points": total_refunded,
		"total_unused": player_data["unused_status_points"],
		"msg": "血统重塑完成！四维属性恢复初始基础值，共退还 %d 点属性点。" % total_refunded
	}

# 忘却之书重置单项技能 1 点 (50311~50320 Book of Oblivion)
func reset_single_skill_point(skill_id: int, player_skills: Dictionary, player_data: Dictionary, inventory: Array, item_slot: int) -> Dictionary:
	if item_slot < 0 or item_slot >= inventory.size() or inventory[item_slot] == null:
		return {"ok": false, "reason": "INVALID_SLOT"}
	
	var book: Dictionary = inventory[item_slot]
	var book_vnum := int(book.get("vnum", 0))
	var book_target_skill := int(book.get("target_skill", 0))
	
	# 检查是否为忘却之书 (50311~50330)
	if book_vnum < 50311 or book_vnum > 50330:
		return {"ok": false, "reason": "NOT_A_BOOK_OF_OBLIVION", "msg": "需要使用对应的【忘却之书】！"}
	
	if book_target_skill != 0 and book_target_skill != skill_id:
		return {"ok": false, "reason": "SKILL_ID_MISMATCH", "msg": "此忘却之书与目标技能不符！"}
	
	var cur_skill_lv := int(player_skills.get(skill_id, 0))
	if cur_skill_lv <= 0:
		return {"ok": false, "reason": "SKILL_LEVEL_ZERO", "msg": "该技能尚未习得，无法忘却！"}
	
	# 40250 官方规则：技能达到 Master (>= 20) 后无法使用普通忘却之书降级
	if cur_skill_lv >= 20:
		return {"ok": false, "reason": "SKILL_IS_MASTER", "msg": "已达到大师境界(Master)的技能无法通过普通忘却之书降级！"}
	
	# 消耗 1 本忘却之书
	var cnt := int(book.get("count", 1))
	if cnt > 1:
		book["count"] = cnt - 1
	else:
		inventory[item_slot] = null
	
	player_skills[skill_id] = cur_skill_lv - 1
	player_data["unused_skill_points"] = int(player_data.get("unused_skill_points", 0)) + 1
	
	skill_point_reset.emit(skill_id, player_skills[skill_id])
	
	return {
		"ok": true,
		"skill_id": skill_id,
		"new_level": player_skills[skill_id],
		"refunded_points": 1,
		"total_unused": player_data["unused_skill_points"],
		"msg": "领悟忘却之书！技能等级降低 1 级，返还 1 点可用技能点。"
	}

# 技能重置卷轴全技能洗点 (71001)
func reset_all_skills(player_skills: Dictionary, player_data: Dictionary, inventory: Array, item_slot: int) -> Dictionary:
	if item_slot < 0 or item_slot >= inventory.size() or inventory[item_slot] == null:
		return {"ok": false, "reason": "INVALID_SLOT"}
	
	var item: Dictionary = inventory[item_slot]
	if int(item.get("vnum", 0)) != VNUM_SKILL_RESET_SCROLL:
		return {"ok": false, "reason": "NOT_A_SKILL_RESET_SCROLL", "msg": "需要使用【技能重置卷轴】(71001)！"}
	
	var total_refunded := 0
	for sk_id in player_skills.keys():
		var lv := int(player_skills[sk_id])
		if lv > 0:
			total_refunded += lv
			player_skills[sk_id] = 0
	
	# 消耗 1 卷
	var cnt := int(item.get("count", 1))
	if cnt > 1:
		item["count"] = cnt - 1
	else:
		inventory[item_slot] = null
	
	player_data["unused_skill_points"] = int(player_data.get("unused_skill_points", 0)) + total_refunded
	
	all_skills_reset.emit(total_refunded)
	
	return {
		"ok": true,
		"refunded_points": total_refunded,
		"total_unused": player_data["unused_skill_points"],
		"msg": "技能重置完成！所有技能点已洗净，全额返还 %d 点可用技能点。" % total_refunded
	}