using System;
using UnityEngine;

public class EnemyHealth : MonoBehaviour, IDamageable
{
    [SerializeField] private float maxHealth = 100f;
    [SerializeField] private float knockbackDuration = 0.5f;

    public float CurrentHealth { get; private set; }
    public float MaxHealth => maxHealth;
    public bool IsDead { get; private set; }

    public event Action<float, float> OnHealthChanged; // ★追加：HP変更イベント(現在HP, 最大HP)
    public event Action<float> OnKnockbackRequested;
    public event Action OnDeath;

    private EnemyAI enemyAI;
    private Animator anim;
    private Collider col;

    private static readonly int DeadHash = Animator.StringToHash("Dead");

    private void Awake()
    {
        CurrentHealth = maxHealth;
        enemyAI = GetComponent<EnemyAI>();
        anim = GetComponent<Animator>();
        col = GetComponent<Collider>();
    }

    private void Start()
    {
        OnHealthChanged?.Invoke(CurrentHealth, maxHealth);
    }

    private void OnEnable()
    {
        if (enemyAI != null)
        {
            OnKnockbackRequested += enemyAI.TriggerKnockback;
            OnDeath += enemyAI.DisableAIOnDeath;
        }
    }

    private void OnDisable()
    {
        if (enemyAI != null)
        {
            OnKnockbackRequested -= enemyAI.TriggerKnockback;
            OnDeath -= enemyAI.DisableAIOnDeath;
        }
    }

    public void TakeDamage(DamageInfo damageInfo)
    {
        if (IsDead) return;

        CurrentHealth = Mathf.Max(0f, CurrentHealth - damageInfo.amount);
        OnHealthChanged?.Invoke(CurrentHealth, maxHealth); // ★HP変更をUIに通知

        if (CurrentHealth <= 0f)
        {
            Die();
        }
        else
        {
            OnKnockbackRequested?.Invoke(knockbackDuration);
        }
    }

    private void Die()
    {
        if (IsDead) return;
        IsDead = true;

        if (anim != null) anim.SetTrigger(DeadHash);
        if (col != null) col.enabled = false;

        OnDeath?.Invoke();
        Destroy(gameObject, 3.0f);
    }
}