using UnityEngine;

[RequireComponent(typeof(Health))]
public class MeleeEnemy : MonoBehaviour
{
    enum State
    {
        Wandering = 0,
        Seeking = 1,
        Dead = 2,
    };

    //private State _currentState;
    private System.Action updateFunc;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        //_currentState = State::Wandering;
        updateFunc = DoWander;
        var h = GetComponent<Health>();
        h.OnDeath += ProcessDeath;
    }

#region Wander
    [Header("Wander")]
    public float dirChangeDuration = 2;
    public float wanderSpeed;

    private Vector3 wanderDir;
    private float _lastDirChange = -2;
    private void DoWander()
    {
        if (_lastDirChange + dirChangeDuration < Time.time)
        {
            wanderDir.x = Random.Range(-1f, 1f);
            wanderDir.y = Random.Range(-1f, 1f);
            _lastDirChange = Time.time;
            //Debug.Log($"New wander dir: {wanderDir}");
        }

        transform.position += wanderDir * wanderSpeed * Time.deltaTime;
    }
#endregion Wander

#region Seek
    [Header("Seek")]
    public float seekSpeed = 2;

    private Transform _target;
    private void DoSeek()
    {
        var dir = (_target.position - transform.position).normalized;
        transform.position += dir * seekSpeed * Time.deltaTime;
    }
#endregion Seek

    private void DoSleep()
    {

    }

    // Update is called once per frame
    private void Update()
    {
        updateFunc();
    }

    private void ProcessDeath()
    {
        // TODO: effects
        Destroy(gameObject);
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("Player"))
        {
            //Debug.Log("Player is in our sphere");
            _target = other.transform;
            updateFunc = DoSeek;
        }
    }

    private void OnCollisionEnter2D(Collision2D other)
    {
        if (other.collider.CompareTag("Player"))
        {
            Debug.Log("We have hit the player!");
            var health = other.gameObject.GetComponent<Health>();
            if (health != null)
            {
                updateFunc = DoSleep;
                Destroy(gameObject);
                health.DealDamage(5);
            }
        }
    }
}