using System;
using UnityEngine;
using Colosseum.Player;

namespace Colosseum.UI
{
    /// <summary>
    /// 플레이어 HUD - 체력/마나 바 관리
    /// </summary>
    public class PlayerHUD : MonoBehaviour
    {
        [Header("Stat Bars")]
        [SerializeField] private StatBar healthBar;
        [SerializeField] private StatBar manaBar;

        [Header("Target")]
        [Tooltip("자동으로 로컬 플레이어 찾기")]
        [SerializeField] private bool autoFindPlayer = true;

        private PlayerNetworkController targetPlayer;

        private void Start()
        {
            if (autoFindPlayer)
            {
                FindLocalPlayer();
            }
        }

        private void Update()
        {
            // 플레이어가 아직 없으면 계속 찾기
            if (targetPlayer == null && autoFindPlayer)
            {
                FindLocalPlayer();
            }
        }

        private void OnDestroy()
        {
            // 이벤트 구독 해제
            UnsubscribeFromEvents();
        }

        private void FindLocalPlayer()
        {
            foreach (var player in FindObjectsByType<PlayerNetworkController>(FindObjectsSortMode.None))
            {
                if (player.IsOwner)
                {
                    SetTarget(player);
                    break;
                }
            }
        }

        /// <summary>
        /// 추적할 플레이어 설정
        /// </summary>
        public void SetTarget(PlayerNetworkController player)
        {
            // 이전 타겟 구독 해제
            UnsubscribeFromEvents();

            targetPlayer = player;

            // 새 타겟 구독
            SubscribeToEvents();

            // 초기 값 설정
            UpdateStatBars();
        }

        private void SubscribeToEvents()
        {
            if (targetPlayer == null) return;

            targetPlayer.OnHealthChanged += HandleHealthChanged;
            targetPlayer.OnManaChanged += HandleManaChanged;
            targetPlayer.OnShieldChanged += HandleShieldChanged;
        }

        private void UnsubscribeFromEvents()
        {
            if (targetPlayer == null) return;

            targetPlayer.OnHealthChanged -= HandleHealthChanged;
            targetPlayer.OnManaChanged -= HandleManaChanged;
            targetPlayer.OnShieldChanged -= HandleShieldChanged;
        }

        private void HandleHealthChanged(float oldValue, float newValue)
        {
            if (healthBar != null && targetPlayer != null)
            {
                healthBar.SetValue(newValue, targetPlayer.MaxHealth, targetPlayer.Shield);
            }
        }

        private void HandleManaChanged(float oldValue, float newValue)
        {
            if (manaBar != null && targetPlayer != null)
            {
                manaBar.SetValue(newValue, targetPlayer.MaxMana);
            }
        }

        private void HandleShieldChanged(float oldValue, float newValue)
        {
            if (healthBar != null && targetPlayer != null)
            {
                healthBar.SetValue(targetPlayer.Health, targetPlayer.MaxHealth, newValue);
            }
        }

        private void UpdateStatBars()
        {
            if (targetPlayer == null) return;

            if (healthBar != null)
            {
                healthBar.SetValue(targetPlayer.Health, targetPlayer.MaxHealth, targetPlayer.Shield);
            }

            if (manaBar != null)
            {
                manaBar.SetValue(targetPlayer.Mana, targetPlayer.MaxMana);
            }
        }
    }
}