# class_specialization_system.gd —— Metin2 40250 角色 30 级双流派转职与无损洗髓系统 1:1
# 对照 40250 服务端 quest/skill_group.quest, char_skill.cpp, cmd_general.cpp
class_name ClassSpecializationSystem
extends RefCounted

signal specialization_chosen(job: int, spec_id: int, spec_name: String)
signal skill_point_allocated(skill_vnum: int, new_level: int, remaining_points: int)
signal specialization_reset(refunded_points: int)

const VNUM_RESET_SCROLL := 71100 # 洗髓卷轴 / 重新分配技能书 (Scroll of Redistribution)
const REQUIRED_LEVEL := 30       # 转职等级门槛

const SPEC_TREE: Dictionary = {
	0: { # 战士
		1: {
			"name": "战狂流派 (Arahan)",
			"desc": "极度偏向狂暴输出与高速连斩，兼具霸体与破坏力",
			"skills": {
				1: "三连斩",
				2: "旋风斩",
				3: "狂战士",
				4: "剑气",
				5: "冲锋"
			}
		},
		2: {
			"name": "圣战流派 (Partisan)",
			"desc": "坚若磐石的钢铁之躯，以强身术与精神打击粉碎强敌",
			"skills": {
				16: "强身术",
				17: "精神打击",
				18: "宝剑斩",
				19: "震地波",
				20: "剑气斩"
			}
		}
	},
	1: { # 刺客
		1: {
			"name": "近战刺客流派 (Dagger)",
			"desc": "隐身于阴影之中，擅长淬毒与致命近身背刺",
			"skills": {
				31: "伏击",
				32: "绝杀",
				33: "匕首旋风",
				34: "隐身术",
				35: "毒刃"
			}
		},
		2: {
			"name": "远程弓箭流派 (Archer)",
			"desc": "千里之外取敌首级，漫天箭雨与火炎穿透射击",
			"skills": {
				46: "连射",
				47: "箭雨",
				48: "火炎箭",
				49: "疾风步",
				50: "毒箭"
			}
		}
	},
	2: { # 修罗
		1: {
			"name": "魔剑修罗流派 (Weapon)",
			"desc": "附魔之刃附体，吸血噬魂与破魔剑气并存",
			"skills": {
				61: "附魔之刃",
				62: "附魔之甲",
				63: "惧意",
				64: "龙卷风",
				65: "手指戳击"
			}
		},
		2: {
			"name": "黑魔法修罗流派 (Black Magic)",
			"desc": "掌控幽冥暗焰，幽暗之盾抵消伤害，黑暗之球远程轰杀",
			"skills": {
				76: "幽冥一击",
				77: "烈焰一击",
				78: "黑暗之球",
				79: "幽暗之盾",
				80: "鬼影步"
			}
		}
	},
	3: { # 萨满
		1: {
			"name": "巨龙神圣辅助流派 (Dragon)",
			"desc": "掌控巨龙图腾之力，为团队提供巨龙之赐与龙之协助光环",
			"skills": {
				91: "飞龙射击",
				92: "巨龙射击",
				93: "巨龙咆哮",
				94: "巨龙之赐",
				95: "龙之协助"
			}
		},
		2: {
			"name": "雷电神圣治疗流派 (Lightning)",
			"desc": "引动九天雷电轰杀群敌，施展神圣治愈术与疾风迅捷",
			"skills": {
				106: "雷电箭",
				107: "召唤雷电",
				108: "雷电之爪",
				109: "治愈术",
				110: "迅捷步"
			}
		}
	}
}

# 获取职业可选流派
func get_available_specializations(job: int) -> Dictionary:
	return SPEC_TREE.get(job, {})

# 进行 30 级转职选定流派
func choose_specialization(spec_id: int, player_data: Dictionary) -> Dictionary:
	var job: int = int(player_data.get("job", 0))
	var lvl: int = int(player_data.get("level", 1))

	if lvl < REQUIRED_LEVEL:
		return {"ok": false, "reason": "LEVEL_TOO_LOW", "msg": "转职需要角色等级达到 30 级！当前等级: %d" % lvl}

	var cur_group: int = int(player_data.get("skill_group", 0))
	if cur_group != 0:
		return {"ok": false, "reason": "ALREADY_SPECIALIZED", "msg": "你已选定了流派！若需变更，请先使用【洗髓卷轴】。"}

	if not SPEC_TREE.has(job) or not SPEC_TREE[job].has(spec_id):
		return {"ok": false, "reason": "INVALID_SPEC_ID", "msg": "无效的流派代码！"}

	var spec = SPEC_TREE[job][spec_id]
	player_data["skill_group"] = spec_id

	# 初始化该流派专属 5 大技能
	if not player_data.has("skills"):
		player_data["skills"] = {}

	for svnum in spec["skills"].keys():
		player_data["skills"][svnum] = {
			"name": spec["skills"][svnum],
			"level": 0,
			"master_type": 0
		}

	specialization_chosen.emit(job, spec_id, spec["name"])

	return {
		"ok": true,
		"job": job,
		"spec_id": spec_id,
		"spec_name": spec["name"],
		"skills_count": spec["skills"].size(),
		"msg": "恭喜！成功完成 30 级转职，踏入【%s】流派之道！" % spec["name"]
	}

# 学习与加点技能
func allocate_skill_point(skill_vnum: int, player_data: Dictionary) -> Dictionary:
	var cur_group: int = int(player_data.get("skill_group", 0))
	if cur_group == 0:
		return {"ok": false, "reason": "NOT_SPECIALIZED", "msg": "尚未进行 30 级转职，无法修习流派绝学！"}

	var pts: int = int(player_data.get("skill_points", 0))
	if pts <= 0:
		return {"ok": false, "reason": "NO_SKILL_POINTS", "msg": "技能点数不足！"}

	var skills: Dictionary = player_data.get("skills", {})
	if not skills.has(skill_vnum):
		return {"ok": false, "reason": "SKILL_NOT_AVAILABLE", "msg": "此技能不属于当前专精流派！"}

	var sk = skills[skill_vnum]
	var cur_lvl: int = int(sk.get("level", 0))
	if cur_lvl >= 20:
		return {"ok": false, "reason": "MAX_NORMAL_LEVEL", "msg": "该技能基础等级已满 (20)，进阶需使用技能秘籍！"}

	sk["level"] = cur_lvl + 1
	player_data["skill_points"] = pts - 1

	skill_point_allocated.emit(skill_vnum, sk["level"], player_data["skill_points"])

	return {
		"ok": true,
		"skill_vnum": skill_vnum,
		"new_level": sk["level"],
		"remaining_points": player_data["skill_points"],
		"msg": "【%s】提升至等级 %d！" % [sk.get("name", "技能"), sk["level"]]
	}

# 使用洗髓卷轴 (71100) 无损重置流派与返还技能点
func reset_specialization(inventory: Array, player_data: Dictionary, free_reset: bool = false) -> Dictionary:
	var cur_group: int = int(player_data.get("skill_group", 0))
	if cur_group == 0:
		return {"ok": false, "reason": "NOT_SPECIALIZED", "msg": "当前尚未选定任何专精流派，无需洗髓！"}

	# 卷轴消耗检查
	var scroll_slot = -1
	if not free_reset:
		for i in range(inventory.size()):
			if inventory[i] != null and int(inventory[i].get("vnum", 0)) == VNUM_RESET_SCROLL:
				scroll_slot = i
				break
		if scroll_slot == -1:
			return {"ok": false, "reason": "NEED_RESET_SCROLL", "msg": "需要【洗髓卷轴】(71100) 才能重置专精流派！"}

	# 统计已投入的所有技能点数
	var skills: Dictionary = player_data.get("skills", {})
	var total_invested: int = 0
	for svnum in skills.keys():
		var sk = skills[svnum]
		total_invested += int(sk.get("level", 0))

	# 消耗卷轴
	if scroll_slot != -1:
		var sc_item = inventory[scroll_slot]
		var sc_cnt = int(sc_item.get("count", 1))
		if sc_cnt > 1:
			sc_item["count"] = sc_cnt - 1
		else:
			inventory[scroll_slot] = null

	# 全额返还技能点
	var cur_pts: int = int(player_data.get("skill_points", 0))
	player_data["skill_points"] = cur_pts + total_invested
	player_data["skill_group"] = 0
	player_data["skills"] = {}

	specialization_reset.emit(total_invested)

	return {
		"ok": true,
		"refunded_points": total_invested,
		"total_skill_points": player_data["skill_points"],
		"msg": "洗髓成功！经脉重铸，%d 点技能点数全额返还，可重新选定双分支流派！" % total_invested
	}