# guild_skill_system.gd —— Metin2 40250 公会等级与 7 大神龙技能树系统 1:1
# 对照 40250 服务端 guild.cpp, guild_manager.cpp, PythonGuild.cpp, skilldesc.txt:23-29
class_name GuildSkillSystem
extends RefCounted

signal guild_level_up(new_level: int, skill_points: int)
signal guild_skill_cast(skill_id: int, duration: float)

const MAX_GUILD_LEVEL := 20
const MAX_SKILL_LEVEL := 7

# 7 官方公会技能 (skilldesc.txt:23-29)
const SKILL_DRAGON_EYES := 151    # 龙神之眼: 被动增加最大神龙精力
const SKILL_DRAGON_BLOOD := 152   # 龙神之血: 最大 HP 提升
const SKILL_DRAGON_BLESSING := 153# 龙神庇护: 最大 SP 提升
const SKILL_HOLY_ARMOR := 154     # 圣灵之甲: 防御力百分比提升
const SKILL_ACCELERATE := 155     # 疾风步: 攻击与移动速度提升
const SKILL_DRAGON_RAGE := 156    # 龙神之怒: 致命一击几率提升
const SKILL_CASTING_AID := 157    # 咏唱神助: 施法提速 / 技能冷却缩减

const GUILD_SKILLS: Dictionary = {
	SKILL_DRAGON_EYES: {
		"name": "龙神之眼",
		"is_passive": true,
		"spirit_cost": 0,
		"cooldown": 0.0,
		"duration": 0.0
	},
	SKILL_DRAGON_BLOOD: {
		"name": "龙神之血",
		"is_passive": false,
		"spirit_cost": 20,
		"cooldown": 60.0,
		"duration": 300.0 # 5 分钟
	},
	SKILL_DRAGON_BLESSING: {
		"name": "龙神庇护",
		"is_passive": false,
		"spirit_cost": 20,
		"cooldown": 60.0,
		"duration": 300.0
	},
	SKILL_HOLY_ARMOR: {
		"name": "圣灵之甲",
		"is_passive": false,
		"spirit_cost": 25,
		"cooldown": 60.0,
		"duration": 300.0
	},
	SKILL_ACCELERATE: {
		"name": "疾风步",
		"is_passive": false,
		"spirit_cost": 25,
		"cooldown": 60.0,
		"duration": 300.0
	},
	SKILL_DRAGON_RAGE: {
		"name": "龙神之怒",
		"is_passive": false,
		"spirit_cost": 30,
		"cooldown": 60.0,
		"duration": 300.0
	},
	SKILL_CASTING_AID: {
		"name": "咏唱神助",
		"is_passive": false,
		"spirit_cost": 30,
		"cooldown": 60.0,
		"duration": 300.0
	}
}

# 公会基础属性
var guild_level: int = 1
var guild_exp: int = 0
var skill_points: int = 0
var max_spirit: int = 100
var current_spirit: int = 100

# 技能加点等级: skill_id -> level (0~7)
var skill_levels: Dictionary = {
	SKILL_DRAGON_EYES: 0,
	SKILL_DRAGON_BLOOD: 0,
	SKILL_DRAGON_BLESSING: 0,
	SKILL_HOLY_ARMOR: 0,
	SKILL_ACCELERATE: 0,
	SKILL_DRAGON_RAGE: 0,
	SKILL_CASTING_AID: 0
}

# 技能冷却与生效增益
var skill_cooldowns: Dictionary = {}
var active_buffs: Dictionary = {} # skill_id -> { duration, value }

# 计算升级所需经验 (guild.cpp)
static func get_exp_needed_for_level(lvl: int) -> int:
	return lvl * 50000

# 捐献公会经验
func donate_exp(amount: int) -> Dictionary:
	if guild_level >= MAX_GUILD_LEVEL:
		return {"ok": false, "reason": "MAX_LEVEL", "msg": "公会已达到最高 20 级！"}

	guild_exp += amount
	var leveled_up := false
	var levels_gained := 0

	while guild_level < MAX_GUILD_LEVEL:
		var needed = get_exp_needed_for_level(guild_level)
		if guild_exp >= needed:
			guild_exp -= needed
			guild_level += 1
			skill_points += 1
			levels_gained += 1
			leveled_up = true
		else:
			break

	if leveled_up:
		_recalculate_spirit()
		guild_level_up.emit(guild_level, skill_points)

	return {
		"ok": true,
		"guild_level": guild_level,
		"guild_exp": guild_exp,
		"needed_exp": get_exp_needed_for_level(guild_level),
		"skill_points": skill_points,
		"leveled_up": leveled_up
	}

# 升级公会技能
func level_up_skill(skill_id: int) -> Dictionary:
	if not GUILD_SKILLS.has(skill_id):
		return {"ok": false, "reason": "INVALID_SKILL"}
	if skill_points <= 0:
		return {"ok": false, "reason": "NO_SKILL_POINTS", "msg": "可用公会技能点不足！"}

	var cur_lvl: int = int(skill_levels.get(skill_id, 0))
	if cur_lvl >= MAX_SKILL_LEVEL:
		return {"ok": false, "reason": "MAX_SKILL_LEVEL", "msg": "该公会技能已满级！"}

	skill_levels[skill_id] = cur_lvl + 1
	skill_points -= 1
	_recalculate_spirit()

	return {
		"ok": true,
		"skill_id": skill_id,
		"new_level": skill_levels[skill_id],
		"remaining_points": skill_points
	}

func _recalculate_spirit() -> void:
	# 151 龙神之眼扩充神龙精力
	var eyes_lvl: int = int(skill_levels.get(SKILL_DRAGON_EYES, 0))
	var bonus_sp: int = int(round(float(eyes_lvl) / float(MAX_SKILL_LEVEL) * 100.0))
	max_spirit = 100 + bonus_sp
	current_spirit = mini(current_spirit, max_spirit)

# 施放公会技能
func cast_guild_skill(skill_id: int) -> Dictionary:
	if not GUILD_SKILLS.has(skill_id):
		return {"ok": false, "reason": "INVALID_SKILL"}

	var cfg: Dictionary = GUILD_SKILLS[skill_id]
	if bool(cfg["is_passive"]):
		return {"ok": false, "reason": "PASSIVE_SKILL", "msg": "被动技能无需主动施放！"}

	var lvl: int = int(skill_levels.get(skill_id, 0))
	if lvl <= 0:
		return {"ok": false, "reason": "NOT_LEARNED", "msg": "尚未学习该公会技能！"}

	# 检查冷却
	if float(skill_cooldowns.get(skill_id, 0.0)) > 0.0:
		return {"ok": false, "reason": "COOLDOWN_ACTIVE", "remaining": skill_cooldowns[skill_id]}

	# 检查精力消耗
	var cost: int = int(cfg["spirit_cost"])
	if current_spirit < cost:
		return {"ok": false, "reason": "NOT_ENOUGH_SPIRIT", "msg": "公会神龙精力不足！"}

	# 扣除精力并进入冷却
	current_spirit -= cost
	skill_cooldowns[skill_id] = float(cfg["cooldown"])

	# 计算技能数值 (对齐 skilldesc.txt: k = lvl / 7.0)
	var k: float = float(lvl) / float(MAX_SKILL_LEVEL)
	var dur: float = float(cfg["duration"])
	var val: float = 0.0

	match skill_id:
		SKILL_DRAGON_BLOOD: val = k * 20.0     # Max HP +20%
		SKILL_DRAGON_BLESSING: val = k * 20.0  # Max SP +20%
		SKILL_HOLY_ARMOR: val = k * 10.0       # DEF +10%
		SKILL_ACCELERATE: val = k * 30.0       # Atk & Motion Speed +30
		SKILL_DRAGON_RAGE: val = k * 50.0      # Crit +50%
		SKILL_CASTING_AID: val = k * 50.0      # Cooldown reduction +50%

	active_buffs[skill_id] = {
		"name": cfg["name"],
		"value": val,
		"duration": dur,
		"total_duration": dur
	}

	guild_skill_cast.emit(skill_id, dur)

	return {
		"ok": true,
		"skill_id": skill_id,
		"name": cfg["name"],
		"value": val,
		"duration": dur,
		"current_spirit": current_spirit
	}

# 逐帧更新冷却与生效增益
func update(dt: float) -> void:
	# 更新技能冷却
	for sid in skill_cooldowns.keys():
		skill_cooldowns[sid] = maxf(0.0, float(skill_cooldowns[sid]) - dt)
		if float(skill_cooldowns[sid]) <= 0.0:
			skill_cooldowns.erase(sid)

	# 更新增益持续时间
	var expired: Array[int] = []
	for sid in active_buffs.keys():
		var b: Dictionary = active_buffs[sid]
		b["duration"] = maxf(0.0, float(b["duration"]) - dt)
		if float(b["duration"]) <= 0.0:
			expired.append(sid)

	for sid in expired:
		active_buffs.erase(sid)

	# 恢复精力 (每秒恢复 0.5)
	current_spirit = mini(max_spirit, current_spirit + int(round(0.5 * dt)))

# 查询当前激活的所有公会增益
func get_active_bonuses() -> Dictionary:
	var res: Dictionary = {
		"max_hp_pct": 0.0,
		"max_sp_pct": 0.0,
		"def_pct": 0.0,
		"speed_bonus": 0.0,
		"critical_pct": 0.0,
		"casting_aid_pct": 0.0
	}

	if active_buffs.has(SKILL_DRAGON_BLOOD):
		res["max_hp_pct"] = float(active_buffs[SKILL_DRAGON_BLOOD]["value"])
	if active_buffs.has(SKILL_DRAGON_BLESSING):
		res["max_sp_pct"] = float(active_buffs[SKILL_DRAGON_BLESSING]["value"])
	if active_buffs.has(SKILL_HOLY_ARMOR):
		res["def_pct"] = float(active_buffs[SKILL_HOLY_ARMOR]["value"])
	if active_buffs.has(SKILL_ACCELERATE):
		res["speed_bonus"] = float(active_buffs[SKILL_ACCELERATE]["value"])
	if active_buffs.has(SKILL_DRAGON_RAGE):
		res["critical_pct"] = float(active_buffs[SKILL_DRAGON_RAGE]["value"])
	if active_buffs.has(SKILL_CASTING_AID):
		res["casting_aid_pct"] = float(active_buffs[SKILL_CASTING_AID]["value"])

	return res