# mounted_combat_skill_system.gd —— Metin2 40250 野外军马冲杀与马上技能协同打击 1:1
# 对照 40250 服务端 char_horse.cpp, char_battle.cpp, skill.cpp
class_name MountedCombatSkillSystem
extends RefCounted

signal horse_mounted(tier: int, horse_level: int, speed_bonus: int)
signal horse_unmounted()
signal mounted_attack_executed(target_count: int, total_dmg: int)
signal horse_skill_cast(skill_vnum: int, skill_name: String, dmg: int, hit_count: int)
signal horse_fed(item_name: String, recovered_stamina: int)

enum HorseTier {
	NONE = 0,
	NORMAL = 1,   # 1~10 级 (代步)
	COMBAT = 2,   # 11~20 级 (马上普攻)
	MILITARY = 3  # 21~30 级 (马上 3 大绝技)
}

const SKILL_HORSE_CHARGE := 121 # 马上突刺 (Horse Charge)
const SKILL_HORSE_STOMP  := 122 # 踏马震地 (Horse Stomp)
const SKILL_HORSE_WAVE   := 123 # 马尾狂风 (Horse Wave)

const HORSE_SKILLS: Dictionary = {
	SKILL_HORSE_CHARGE: {
		"name": "马背突刺",
		"mult": 2.5,
		"cd": 12.0,
		"sp": 60,
		"range": 12.0,
		"desc": "战马极速直线突进贯穿群怪，造成击飞与重创"
	},
	SKILL_HORSE_STOMP: {
		"name": "踏马震地",
		"mult": 2.0,
		"cd": 15.0,
		"sp": 75,
		"range": 6.0,
		"desc": "战马双蹄扬起践踏大地，造成 360 度范围伤害与强力眩晕"
	},
	SKILL_HORSE_WAVE: {
		"name": "马尾狂风",
		"mult": 1.8,
		"cd": 10.0,
		"sp": 50,
		"range": 5.0,
		"desc": "战马回旋摆尾卷起狂风，大范围震退近身敌群"
	}
}

const FOOD_ITEMS: Dictionary = {
	50054: {"name": "干草", "stamina": 30},
	50055: {"name": "胡萝卜", "stamina": 60},
	50056: {"name": "红参", "stamina": 100}
}

var is_mounted: bool = false
var horse_level: int = 1
var horse_tier: int = HorseTier.NONE
var speed_bonus: int = 0
var stamina: int = 100
var max_stamina: int = 100

var skill_cooldowns: Dictionary = {
	SKILL_HORSE_CHARGE: 0.0,
	SKILL_HORSE_STOMP: 0.0,
	SKILL_HORSE_WAVE: 0.0
}

# 骑乘战马
func mount_horse(level: int = 21) -> Dictionary:
	if is_mounted:
		return {"ok": false, "reason": "ALREADY_MOUNTED"}

	horse_level = clamp(level, 1, 30)
	if horse_level >= 21:
		horse_tier = HorseTier.MILITARY
		speed_bonus = 50
	elif horse_level >= 11:
		horse_tier = HorseTier.COMBAT
		speed_bonus = 40
	else:
		horse_tier = HorseTier.NORMAL
		speed_bonus = 30

	is_mounted = true
	horse_mounted.emit(horse_tier, horse_level, speed_bonus)

	return {
		"ok": true,
		"tier": horse_tier,
		"level": horse_level,
		"speed_bonus": speed_bonus,
		"msg": "跨上战马！移动速度提升 %d 点。" % speed_bonus
	}

# 下马
func unmount_horse() -> Dictionary:
	if not is_mounted:
		return {"ok": false, "reason": "NOT_MOUNTED"}

	is_mounted = false
	horse_tier = HorseTier.NONE
	speed_bonus = 0
	horse_unmounted.emit()
	return {"ok": true, "msg": "翻身下马。"}

# 心跳刷新技能冷却
func update(delta: float) -> void:
	for sk in skill_cooldowns.keys():
		if skill_cooldowns[sk] > 0.0:
			skill_cooldowns[sk] = max(0.0, skill_cooldowns[sk] - delta)

# 马背普通连斩反击 (需战斗马以上)
func execute_mounted_attack(base_atk: int, targets: Array) -> Dictionary:
	if not is_mounted:
		return {"ok": false, "reason": "NOT_MOUNTED"}

	if horse_tier < HorseTier.COMBAT:
		return {"ok": false, "reason": "TIER_TOO_LOW", "msg": "普通马匹无法在马背上挥砍！需升级至 11 级战斗战马。"}

	if stamina <= 0:
		return {"ok": false, "reason": "EXHAUSTED", "msg": "战马体力耗尽，无法施展马战挥砍！请喂食干草或胡萝卜。"}

	# 每次攻击消耗 1 点马匹耐力
	stamina = max(0, stamina - 1)

	var hit_count = 0
	var total_dmg = 0
	# 战马提供 1.2x 基础冲击加成
	var dmg_per_hit = int(float(base_atk) * 1.2)

	for tgt in targets:
		hit_count += 1
		total_dmg += dmg_per_hit

	mounted_attack_executed.emit(hit_count, total_dmg)

	return {
		"ok": true,
		"hit_count": hit_count,
		"dmg_per_hit": dmg_per_hit,
		"total_damage": total_dmg,
		"stamina": stamina
	}

# 释放马上专属技能 (需军用武装战马)
func cast_horse_skill(skill_vnum: int, base_atk: int, player_data: Dictionary, targets: Array) -> Dictionary:
	if not is_mounted:
		return {"ok": false, "reason": "NOT_MOUNTED"}

	if horse_tier < HorseTier.MILITARY:
		return {"ok": false, "reason": "TIER_TOO_LOW", "msg": "只有 21 级以上的【军用战马】才能释放马背专属技能！"}

	if not HORSE_SKILLS.has(skill_vnum):
		return {"ok": false, "reason": "INVALID_HORSE_SKILL"}

	var cfg = HORSE_SKILLS[skill_vnum]
	var cd: float = skill_cooldowns[skill_vnum]
	if cd > 0.0:
		return {"ok": false, "reason": "SKILL_ON_COOLDOWN", "msg": "技能正在冷却中！剩余 %.1f 秒" % cd}

	var sp_cost: int = cfg["sp"]
	var cur_sp: int = int(player_data.get("sp", 0))
	if cur_sp < sp_cost:
		return {"ok": false, "reason": "NOT_ENOUGH_SP", "msg": "内力法力不足！需要 %d 点 SP" % sp_cost}

	if stamina < 5:
		return {"ok": false, "reason": "NOT_ENOUGH_STAMINA", "msg": "战马体力不足，无法施展大招！"}

	# 消耗资源
	player_data["sp"] = cur_sp - sp_cost
	stamina = max(0, stamina - 5)
	skill_cooldowns[skill_vnum] = cfg["cd"]

	var skill_dmg = int(float(base_atk) * cfg["mult"])
	var hit_count = targets.size()

	horse_skill_cast.emit(skill_vnum, cfg["name"], skill_dmg, hit_count)

	return {
		"ok": true,
		"skill_vnum": skill_vnum,
		"skill_name": cfg["name"],
		"damage": skill_dmg,
		"hit_count": hit_count,
		"stamina": stamina,
		"remaining_sp": player_data["sp"],
		"msg": "战马嘶鸣！施展了马上绝技【%s】！" % cfg["name"]
	}

# 喂食战马恢复体力
func feed_horse(food_vnum: int, inventory: Array) -> Dictionary:
	if not FOOD_ITEMS.has(food_vnum):
		return {"ok": false, "reason": "INVALID_FOOD"}

	var slot = -1
	for i in range(inventory.size()):
		if inventory[i] != null and int(inventory[i].get("vnum", 0)) == food_vnum:
			slot = i
			break

	if slot == -1:
		return {"ok": false, "reason": "FOOD_NOT_IN_INVENTORY", "msg": "背包中没有此马粮！"}

	var item = inventory[slot]
	var cnt = int(item.get("count", 1))
	if cnt > 1:
		item["count"] = cnt - 1
	else:
		inventory[slot] = null

	var food = FOOD_ITEMS[food_vnum]
	var recovered = food["stamina"]
	stamina = min(max_stamina, stamina + recovered)

	horse_fed.emit(food["name"], recovered)

	return {
		"ok": true,
		"food_name": food["name"],
		"recovered": recovered,
		"current_stamina": stamina,
		"msg": "喂食了【%s】，战马体力恢复至 %d/%d！" % [food["name"], stamina, max_stamina]
	}