using UnityEngine;
using UnityEngine.AI;

/// <summary>
/// Attach to any door/window barrier the zombie should break through.
///
/// Setup:
///   - Add a NavMeshObstacle component (Carve = true) so the NavMesh treats it as blocked.
///   - Assign the barrier's layer to match AIBehaviour.barrierLayer.
///   - Optionally populate the 'boards' array with child visuals that get hidden as health drops.
/// </summary>
public class Barrier : MonoBehaviour
{
    [Header("Health")]
    public float maxHealth = 100f;

    [Header("Board Visuals (optional)")]
    [Tooltip("Child objects representing planks/boards. They are hidden progressively as health drops.")]
    public GameObject[] boards;

    public bool IsDestroyed { get; private set; }

    private float _health;
    private NavMeshObstacle _obstacle;

    void Awake()
    {
        _health   = maxHealth;
        _obstacle = GetComponent<NavMeshObstacle>();
    }

    public void TakeDamage(float damage)
    {
        if (IsDestroyed) return;

        _health -= damage;
        UpdateBoards();

        if (_health <= 0f)
            Break();
    }

    void UpdateBoards()
    {
        if (boards == null || boards.Length == 0) return;

        // Show boards proportional to remaining health
        int boardsToShow = Mathf.CeilToInt((_health / maxHealth) * boards.Length);
        for (int i = 0; i < boards.Length; i++)
        {
            if (boards[i] != null)
                boards[i].SetActive(i < boardsToShow);
        }
    }

    void Break()
    {
        IsDestroyed = true;

        // Disable the NavMesh obstacle so pathfinding opens back up
        if (_obstacle != null)
            _obstacle.enabled = false;

        // Disable colliders so zombies walk through
        foreach (Collider col in GetComponentsInChildren<Collider>())
            col.enabled = false;

        // Hide visuals
        foreach (GameObject board in boards)
            if (board != null) board.SetActive(false);

        Destroy(gameObject, 0.1f);
    }

#if UNITY_EDITOR
    void OnDrawGizmosSelected()
    {
        Gizmos.color = new Color(1f, 0.5f, 0f, 0.5f);
        Gizmos.DrawWireCube(transform.position, transform.localScale);
    }
#endif
}