using UnityEngine;
using UnityEngine.UI;
using IndianOceanAssets.Engine2_5D;
using GameFramework;

namespace GameFramework
{
    /// <summary>
    /// 游戏内 HUD —— 显示血量、灵灯数量/CD、分数、暂停按钮。
    /// 挂在 Gameplay 场景的 HUD Canvas 上。
    /// </summary>
    public class GameHUD : MonoBehaviour
    {
        [Header("血量")]
        [SerializeField] private Slider healthSlider;
        [SerializeField] private Text healthText;

        [Header("灵灯")]
        [SerializeField] private Text lanternCountText;
        [SerializeField] private Text lanternCDText;
        [SerializeField] private Image lanternCDFill; // 可选：CD 圆形填充

        [Header("分数")]
        [SerializeField] private Text scoreText;

        [Header("暂停")]
        [SerializeField] private Button pauseButton;

        private HealthSystem _playerHealth;
        private SpiritLanternSystem _lanternSystem;
        private int _maxHealth;

        void Start()
        {
            // 查找玩家
            var player = GameObject.FindWithTag("Player");
            if (player != null)
            {
                _playerHealth = player.GetComponent<HealthSystem>();
                _lanternSystem = player.GetComponent<SpiritLanternSystem>();

                // 获取 maxHealth
                if (_playerHealth != null)
                {
                    var field = typeof(HealthSystem).GetField("maxHealth",
                        System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                    if (field != null)
                        _maxHealth = (int)field.GetValue(_playerHealth);
                    else
                        _maxHealth = 100;
                }
            }

            // 绑定暂停按钮
            if (pauseButton != null)
                pauseButton.onClick.AddListener(OnPauseClick);

            // 订阅分数事件
            ScoreManager.onScoreChanged += UpdateScore;

            // 初始更新
            UpdateScore(ScoreManager.Instance != null ? ScoreManager.Instance.CurrentScore : 0);
        }

        void OnDestroy()
        {
            ScoreManager.onScoreChanged -= UpdateScore;
        }

        void Update()
        {
            UpdateHealth();
            UpdateLantern();
        }

        private void UpdateHealth()
        {
            if (_playerHealth == null) return;

            // 获取当前血量
            var field = typeof(HealthSystem).GetField("health",
                System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
            int currentHealth = field != null ? (int)field.GetValue(_playerHealth) : _maxHealth;

            if (healthSlider != null)
                healthSlider.value = (float)currentHealth / _maxHealth;

            if (healthText != null)
                healthText.text = $"{currentHealth}/{_maxHealth}";
        }

        private void UpdateLantern()
        {
            if (_lanternSystem == null) return;

            if (lanternCountText != null)
                lanternCountText.text = $"灵灯: {_lanternSystem.RemainingLanterns}";

            if (lanternCDText != null)
            {
                if (_lanternSystem.IsCooldownReady)
                    lanternCDText.text = "就绪";
                else
                    lanternCDText.text = $"{_lanternSystem.CooldownRemaining:F1}s";
            }

            if (lanternCDFill != null)
            {
                // CD 填充：就绪时满，冷却中递减
                var cdField = typeof(SpiritLanternSystem).GetField("cooldown",
                    System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                float maxCD = cdField != null ? (float)cdField.GetValue(_lanternSystem) : 3f;
                lanternCDFill.fillAmount = _lanternSystem.IsCooldownReady ? 1f :
                    1f - (_lanternSystem.CooldownRemaining / maxCD);
            }
        }

        private void UpdateScore(int score)
        {
            if (scoreText != null)
                scoreText.text = $"分数: {score}";
        }

        private void OnPauseClick()
        {
            if (TimeController.Instance != null)
                TimeController.Instance.Pause();
        }
    }
}