# battle_arena_duel_system.gd —— Metin2 40250 官方武斗竞技场切磋与裁判规则 1:1
# 对照 40250 服务端 arena.cpp, arena.h, BattleArena.cpp, questlua_arena.cpp
class_name BattleArenaDuelSystem
extends RefCounted

signal duel_started(opponent_name: String, set_count: int, time_limit: float)
signal round_started(current_round: int)
signal round_ended(winner_side: String, score_a: int, score_b: int)
signal duel_finished(winner_side: String, final_score_a: int, final_score_b: int, reward: Dictionary)
signal rule_violation_intercepted(reason: String)

const NPC_REFEREE := 20017 # 比武场裁判 (Arena Referee)
const ARENA_MAP_INDEX := 112

# 擂台对立出生点 (Point A 玩家, Point B 对手)
const START_POINT_A := Vector2(100.0, 100.0)
const START_POINT_B := Vector2(200.0, 200.0)
const ARENA_BOUNDS  := Rect2(80.0, 80.0, 140.0, 140.0) # 擂台活动合法矩形区域

# 决斗状态枚举
const STATE_IDLE      := "IDLE"
const STATE_COUNTDOWN := "COUNTDOWN"
const STATE_FIGHTING  := "FIGHTING"
const STATE_ROUND_OVER:= "ROUND_OVER"
const STATE_FINISHED  := "FINISHED"

# 单机官方 4 大门派守擂试炼 NPC 导师
const OPPONENT_PRESETS: Dictionary = {
	"warrior": {
		"id": "warrior",
		"name": "战神武者教头",
		"job": "warrior",
		"max_hp": 12000,
		"attack_power": 450,
		"defense": 200,
		"skills": ["三连斩", "剑气破空"]
	},
	"assassin": {
		"id": "assassin",
		"name": "暗夜游侠神箭手",
		"job": "assassin",
		"max_hp": 9000,
		"attack_power": 520,
		"defense": 150,
		"skills": ["连环毒矢", "疾影步"]
	},
	"sura": {
		"id": "sura",
		"name": "冥界暗影修罗",
		"job": "sura",
		"max_hp": 11000,
		"attack_power": 480,
		"defense": 220,
		"skills": ["幽冥炎刃", "魔灵护体"]
	},
	"shaman": {
		"id": "shaman",
		"name": "雷鸣灵术萨满",
		"job": "shaman",
		"max_hp": 10000,
		"attack_power": 400,
		"defense": 180,
		"skills": ["天顶奔雷", "金钟守护"]
	}
}

# 比赛运行时状态
var match_state: String = STATE_IDLE
var current_round: int = 1
var max_sets: int = 3 # 3 局 2 胜
var sets_to_win: int = 2
var time_limit_per_round: float = 300.0 # 5 分钟
var round_timer: float = 300.0
var countdown_timer: float = 3.0

var score_a: int = 0 # 玩家得分
var score_b: int = 0 # 对手得分

var player_pos: Vector2 = START_POINT_A
var opponent_pos: Vector2 = START_POINT_B

var active_opponent: Dictionary = {}
var opponent_current_hp: int = 0

# 启动武斗切磋
func start_duel(opponent_id: String, sets: int = 3, time_limit: float = 300.0) -> Dictionary:
	if not OPPONENT_PRESETS.has(opponent_id):
		return {"ok": false, "reason": "INVALID_OPPONENT", "msg": "未知的守擂武者！"}
	
	active_opponent = OPPONENT_PRESETS[opponent_id].duplicate(true)
	max_sets = sets
	sets_to_win = int(ceil(float(max_sets) / 2.0))
	time_limit_per_round = time_limit
	
	score_a = 0
	score_b = 0
	current_round = 1
	
	_prepare_round()
	
	duel_started.emit(active_opponent["name"], max_sets, time_limit_per_round)
	return {
		"ok": true,
		"opponent": active_opponent["name"],
		"max_sets": max_sets,
		"sets_to_win": sets_to_win,
		"pos_a": player_pos,
		"pos_b": opponent_pos
	}

# 准备新回合
func _prepare_round() -> void:
	match_state = STATE_COUNTDOWN
	countdown_timer = 3.0
	round_timer = time_limit_per_round
	
	player_pos = START_POINT_A
	opponent_pos = START_POINT_B
	opponent_current_hp = int(active_opponent.get("max_hp", 10000))

# 心跳逻辑推进
func update(delta: float) -> void:
	if match_state == STATE_COUNTDOWN:
		countdown_timer -= delta
		if countdown_timer <= 0.0:
			match_state = STATE_FIGHTING
			round_started.emit(current_round)
	elif match_state == STATE_FIGHTING:
		round_timer -= delta
		if round_timer <= 0.0:
			# 回合超时：双方均未击倒，判定为平局或根据剩余生命决出
			_handle_round_over("timeout")

# 40250 禁药规则拦截
func use_potion_check(item_vnum: int) -> bool:
	if match_state == STATE_FIGHTING or match_state == STATE_COUNTDOWN:
		# 27001~27006 为红蓝药水
		if item_vnum >= 27001 and item_vnum <= 27006:
			rule_violation_intercepted.emit("POTION_FORBIDDEN_IN_ARENA")
			return false
	return true

# 40250 禁马规则拦截
func mount_check() -> bool:
	if match_state == STATE_FIGHTING or match_state == STATE_COUNTDOWN:
		rule_violation_intercepted.emit("MOUNT_FORBIDDEN_IN_ARENA")
		return false
	return true

# 40250 擂台边界巡检
func check_boundary(pos: Vector2) -> bool:
	if not ARENA_BOUNDS.has_point(pos):
		rule_violation_intercepted.emit("OUT_OF_ARENA_BOUNDS")
		return false
	return true

# 击倒判定处理
func record_defeat(defeated_side: String) -> Dictionary:
	if match_state != STATE_FIGHTING:
		return {"ok": false, "reason": "NOT_IN_FIGHTING_STATE"}
	
	var round_winner := ""
	if defeated_side == "B": # 对手倒下，玩家得分
		score_a += 1
		round_winner = "A"
	elif defeated_side == "A": # 玩家倒下，对手得分
		score_b += 1
		round_winner = "B"
	
	return _handle_round_over(round_winner)

# 回合结束与大局胜负判定
func _handle_round_over(winner_side: String) -> Dictionary:
	match_state = STATE_ROUND_OVER
	round_ended.emit(winner_side, score_a, score_b)
	
	# 检查大局是否已有胜者
	if score_a >= sets_to_win or score_b >= sets_to_win or current_round >= max_sets:
		match_state = STATE_FINISHED
		var grand_winner := "A" if score_a > score_b else ("B" if score_b > score_a else "DRAW")
		
		var reward: Dictionary = {}
		if grand_winner == "A":
			reward = {
				"arena_points": 100 * sets_to_win,
				"gold": 500000,
				"title": "【竞技场常胜军】"
			}
		
		duel_finished.emit(grand_winner, score_a, score_b, reward)
		return {
			"ok": true,
			"match_finished": true,
			"winner": grand_winner,
			"score_a": score_a,
			"score_b": score_b,
			"reward": reward
		}
	
	# 进入下一回合
	current_round += 1
	_prepare_round()
	
	return {
		"ok": true,
		"match_finished": false,
		"current_round": current_round,
		"score_a": score_a,
		"score_b": score_b
	}

# 重置武斗场状态
func reset_arena() -> void:
	match_state = STATE_IDLE
	current_round = 1
	score_a = 0
	score_b = 0
	active_opponent.clear()