using UnityEngine;

[RequireComponent(typeof(Animator))]
public class ZombieController : MonoBehaviour
{
    private static readonly int DieHash = Animator.StringToHash("Die");
    private static readonly int IsAttackingHash = Animator.StringToHash("isAttacking");
    private static readonly int IsWalkingHash = Animator.StringToHash("isWalking");
    private static readonly int IsRunningHash = Animator.StringToHash("isRunning");

    [Header("Health")]
    private readonly float maxHealth = 50;
    private float currentHealth;

    [Header("Movement")]
    private readonly float walkSpeed = 1f;
    private readonly float runSpeed = 2f;
    private readonly float runDistance = 5f;      // od kedy začne bežať
    private readonly float attackDistance = 1.5f; // od kedy útočí

    [Header("Attack")]
    private readonly float attackDamage = 10f;
    private readonly float attackCooldown = 1f;
    private float lastAttackTime;

    private Transform player;
    private Animator animator;

    private void Start()
    {
        currentHealth = maxHealth;
        animator = GetComponent<Animator>();

        GameObject playerObject = GameObject.FindGameObjectWithTag("Player");
        if (playerObject != null)
            player = playerObject.transform;
        else
            Debug.LogWarning("Zombie nenašiel hráča — skontroluj tag 'Player'");
    }

    private void Update()
    {
        if (player == null) return;

        float distance = Vector3.Distance(transform.position, player.position);

        if (distance <= attackDistance)
        {
            StopMoving();
            TryAttack();
        }
        else if (distance <= runDistance)
        {
            MoveToPlayer(runSpeed);
            animator.SetBool(IsRunningHash, true);
            animator.SetBool(IsWalkingHash, false);
            animator.SetBool(IsAttackingHash, false);
        }
        else
        {
            MoveToPlayer(walkSpeed);
            animator.SetBool(IsWalkingHash, true);
            animator.SetBool(IsRunningHash, false);
            animator.SetBool(IsAttackingHash, false);
        }
    }

    private void MoveToPlayer(float speed)
    {
        Vector3 direction = (player.position - transform.position).normalized;
        transform.position += speed * Time.deltaTime * direction;
        transform.LookAt(new Vector3(player.position.x, transform.position.y, player.position.z));
    }

    private void StopMoving()
    {
        animator.SetBool(IsWalkingHash, false);
        animator.SetBool(IsRunningHash, false);
    }

    private void TryAttack()
    {
        animator.SetBool(IsAttackingHash, true);

        if (Time.time - lastAttackTime >= attackCooldown)
        {
            lastAttackTime = Time.time;
            Debug.Log($"{gameObject.name} útočí na hráča za {attackDamage} damage!");
            // player.GetComponent<PlayerHealth>()?.TakeDamage(attackDamage);
        }
    }

    public void TakeDamage(float amount)
    {
        currentHealth -= amount;
        Debug.Log($"{gameObject.name} dostal {amount} damage. HP: {currentHealth}/{maxHealth}");

        if (currentHealth <= 0)
            Die();
    }

    private void Die()
    {
        Debug.Log($"{gameObject.name} je mŕtvy!");
        animator.SetTrigger(DieHash);
        Destroy(gameObject, 2f);
    }
}