# empire_kingdom_system.gd —— Metin2 40250 三圣帝国国家归属与领地国运系统 1:1
# 对照 40250 服务端 empire.cpp, questlua_empire.cpp, root/introempire.py
class_name EmpireKingdomSystem
extends RefCounted

signal empire_selected(empire_id: int, empire_name: String)
signal empire_blessing_activated(empire_id: int, blessings: Dictionary)
signal empire_changed(old_empire: int, new_empire: int)
signal territory_entered(map_name: String, is_home: bool, is_hostile: bool)

# 40250 官方三大帝国 ID
const EMPIRE_NONE    := 0
const EMPIRE_SHINSOO := 1 # 慎修帝国 (Shinsoo / 红国)
const EMPIRE_CHUNJO  := 2 # 准照帝国 (Chunjo / 黄国)
const EMPIRE_JINNO   := 3 # 晋诺帝国 (Jinno / 蓝国)

const VNUM_TINCTURE_OF_EMPIRES := 71054 # 转国卷轴 (Tincture of Empires)

# 三大帝国官方档案与专属祈福特性表
const EMPIRES_INFO: Dictionary = {
	EMPIRE_SHINSOO: {
		"id": EMPIRE_SHINSOO,
		"name": "慎修帝国",
		"color": "红国",
		"capital": "永安省 (Yongan)",
		"desc": "南方沿海商业贸易帝国，商贾云集，财富充盈。",
		"home_maps": ["Yongan", "Jayang"],
		"blessings": {
			"gold_bonus_pct": 10, # 金币获取 +10%
			"shop_discount_pct": 5 # 商店折扣 5%
		}
	},
	EMPIRE_CHUNJO: {
		"id": EMPIRE_CHUNJO,
		"name": "准照帝国",
		"color": "黄国",
		"capital": "准安省 (Joan)",
		"desc": "西方高原神圣宗教帝国，受大祭司与神官庇护，信仰虔诚。",
		"home_maps": ["Joan", "Bokjung"],
		"blessings": {
			"cast_speed": 10, # 施法速度 +10
			"cooldown_reduction_pct": 5 # 技能冷却缩减 5%
		}
	},
	EMPIRE_JINNO: {
		"id": EMPIRE_JINNO,
		"name": "晋诺帝国",
		"color": "蓝国",
		"capital": "平武省 (Pyungmoo)",
		"desc": "东方雄关铁血军事帝国，崇尚武道，兵强马壮。",
		"home_maps": ["Pyungmoo", "Bakra"],
		"blessings": {
			"attack_bonus": 50, # 物理攻击 +50
			"monster_damage_pct": 5 # 对怪增伤 5%
		}
	}
}

var current_empire: int = EMPIRE_NONE
var is_blessing_active: bool = false
var blessing_time_remaining: float = 0.0 # 祈福持续时间 (秒)
const BLESSING_DURATION: float = 86400.0 # 24 小时 (86400 秒)

# 初始选择国家
func select_empire(empire_id: int) -> Dictionary:
	if not EMPIRES_INFO.has(empire_id):
		return {"ok": false, "reason": "INVALID_EMPIRE", "msg": "无效的帝国代码！"}
	
	if current_empire != EMPIRE_NONE:
		return {"ok": false, "reason": "ALREADY_HAS_EMPIRE", "msg": "已有国家归属，需使用转国卷轴！"}
	
	current_empire = empire_id
	var info: Dictionary = EMPIRES_INFO[current_empire]
	empire_selected.emit(current_empire, info["name"])
	
	return {
		"ok": true,
		"empire_id": current_empire,
		"name": info["name"],
		"capital": info["capital"],
		"msg": "效忠【%s】成功！开启帝国护国征途。" % info["name"]
	}

# 激活每日帝国国运祈福 (Daily Empire Blessing)
func activate_empire_prayer(player_stats: Dictionary) -> Dictionary:
	if current_empire == EMPIRE_NONE:
		return {"ok": false, "reason": "NO_EMPIRE", "msg": "尚未加入任何帝国！"}
	
	if is_blessing_active:
		# 刷新时长
		blessing_time_remaining = BLESSING_DURATION
		return {"ok": true, "msg": "国运祈福时长已刷新为 24 小时！"}
	
	var blessings: Dictionary = EMPIRES_INFO[current_empire]["blessings"]
	_apply_blessings_to_player(blessings, player_stats, 1)
	
	is_blessing_active = true
	blessing_time_remaining = BLESSING_DURATION
	
	empire_blessing_activated.emit(current_empire, blessings)
	
	return {
		"ok": true,
		"empire_id": current_empire,
		"blessings": blessings,
		"duration": BLESSING_DURATION,
		"msg": "获得【%s】护国祈福！全境增益持续 24 小时。" % EMPIRES_INFO[current_empire]["name"]
	}

# 倒计时推进
func update(delta: float, player_stats: Dictionary) -> void:
	if is_blessing_active:
		blessing_time_remaining -= delta
		if blessing_time_remaining <= 0.0:
			# 祈福过期
			var blessings: Dictionary = EMPIRES_INFO[current_empire]["blessings"]
			_apply_blessings_to_player(blessings, player_stats, -1)
			is_blessing_active = false
			blessing_time_remaining = 0.0

# 领地巡检：判断玩家在某地图是否处于敌国入侵状态
func check_territory(map_name: String) -> Dictionary:
	if current_empire == EMPIRE_NONE:
		return {"is_home": false, "is_hostile": false, "relation": "neutral"}
	
	var my_home_maps: Array = EMPIRES_INFO[current_empire]["home_maps"]
	if my_home_maps.has(map_name):
		territory_entered.emit(map_name, true, false)
		return {"is_home": true, "is_hostile": false, "relation": "homeland"}
	
	# 检查是否为其他两个帝国的本土领地
	for other_id in [EMPIRE_SHINSOO, EMPIRE_CHUNJO, EMPIRE_JINNO]:
		if other_id == current_empire:
			continue
		var foreign_maps: Array = EMPIRES_INFO[other_id]["home_maps"]
		if foreign_maps.has(map_name):
			territory_entered.emit(map_name, false, true)
			return {
				"is_home": false,
				"is_hostile": true,
				"hostile_empire": EMPIRES_INFO[other_id]["name"],
				"relation": "hostile_invasion"
			}
	
	# 中立公共地图 (如沙漠、雪山、烈焰、神殿)
	territory_entered.emit(map_name, false, false)
	return {"is_home": false, "is_hostile": false, "relation": "neutral"}

# 使用转国卷轴更换帝国 (40250 Tincture of Empires 71054)
func change_empire(target_empire: int, item_slot: int, inventory: Array, player_stats: Dictionary, is_in_guild: bool = false) -> Dictionary:
	if not EMPIRES_INFO.has(target_empire):
		return {"ok": false, "reason": "INVALID_TARGET_EMPIRE", "msg": "无效的目标帝国！"}
	
	if target_empire == current_empire:
		return {"ok": false, "reason": "CANNOT_CHANGE_TO_SAME_EMPIRE", "msg": "无法转入当前已效忠的国家！"}
	
	if is_in_guild:
		return {"ok": false, "reason": "MUST_LEAVE_GUILD", "msg": "已有公会归属，必须先退出公会方可转国！"}
	
	if item_slot < 0 or item_slot >= inventory.size() or inventory[item_slot] == null:
		return {"ok": false, "reason": "INVALID_ITEM_SLOT"}
	
	var scroll: Dictionary = inventory[item_slot]
	if int(scroll.get("vnum", 0)) != VNUM_TINCTURE_OF_EMPIRES:
		return {"ok": false, "reason": "NOT_A_TINCTURE_ITEM", "msg": "需要消耗【转国卷轴】(71054)！"}
	
	# 若当前已有祈福加成，先解除旧帝国祈福
	if is_blessing_active:
		var old_blessings: Dictionary = EMPIRES_INFO[current_empire]["blessings"]
		_apply_blessings_to_player(old_blessings, player_stats, -1)
		is_blessing_active = false
		blessing_time_remaining = 0.0
	
	# 消耗转国卷轴
	var cnt := int(scroll.get("count", 1))
	if cnt > 1:
		scroll["count"] = cnt - 1
	else:
		inventory[item_slot] = null
	
	var old_emp := current_empire
	current_empire = target_empire
	
	empire_changed.emit(old_emp, current_empire)
	
	var new_info: Dictionary = EMPIRES_INFO[current_empire]
	return {
		"ok": true,
		"old_empire": old_emp,
		"new_empire": current_empire,
		"new_empire_name": new_info["name"],
		"msg": "成功转入【%s】！请前往母国【%s】领取新的帝国嘉奖。" % [new_info["name"], new_info["capital"]]
	}

func _apply_blessings_to_player(blessings: Dictionary, player_stats: Dictionary, factor: int) -> void:
	for k in blessings.keys():
		var val = int(blessings[k]) * factor
		var cur = int(player_stats.get(k, 0))
		player_stats[k] = cur + val

# 序列化
func serialize() -> Dictionary:
	return {
		"current_empire": current_empire,
		"is_blessing_active": is_blessing_active,
		"blessing_time_remaining": blessing_time_remaining
	}

# 反序列化
func deserialize(data: Dictionary) -> void:
	current_empire = int(data.get("current_empire", EMPIRE_NONE))
	is_blessing_active = bool(data.get("is_blessing_active", false))
	blessing_time_remaining = float(data.get("blessing_time_remaining", 0.0))