using UnityEngine;

public class Enemy : MonoBehaviour
{
    public int maxHealth = 2; //Set max health of the enemy
    private int currentHealth;

    public float moveSpeed = 2f;
    public Transform pointA; //Set a point for the enemy to move between (pointA to pointB)
    public Transform pointB;

    private Vector3 target;

    private float attackCooldown = 1f; // Seconds between attacks
    private float lastAttackTime;

    void Start()
    {
        currentHealth = maxHealth;
        target = pointB.position; //Automatically start heading towards point B
        EnemyManager.RegisterEnemy();
    }

    void Update()
    {
        Patrol(); //Constanstly move between patrol positions
    }

    private void OnDestroy()
    {
        EnemyManager.EnemyDied();
    }

    void Patrol() //Patrol logic
    {
        transform.position = Vector2.MoveTowards(transform.position, target, moveSpeed * Time.deltaTime); //Movement logic

        // Flip enemy sprite to face the direction it's moving
        Vector3 direction = target - transform.position;
        if (direction.x > 0)
        {
            transform.localScale = new Vector3(1, 1, 1);   // Face right
        }
        else if (direction.x < 0)
        {
            transform.localScale = new Vector3(-1, 1, 1);  // Face left
        }
            
        //Change direction when at the other point
        if (Vector2.Distance(transform.position, pointA.position) < 0.1f) 
        {
            target = pointB.position;
        }
        else if (Vector2.Distance(transform.position, pointB.position) < 0.1f)
        {
            target = pointA.position;
        }
        
    }

    public void TakeDamage(int damage)
    {
        currentHealth -= damage;

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

    void Die()
    {
        Destroy(gameObject);
    }

    // Damage player on contact, with cooldown to avoid spamming damage every frame
    private void OnTriggerStay2D(Collider2D collision)
    {
        if (collision.CompareTag("Player") && Time.time >= lastAttackTime + attackCooldown)
        {
            PlayerHealth playerHealth = collision.GetComponent<PlayerHealth>();
            if (playerHealth != null)
            {
                playerHealth.TakeDamage(1);
                lastAttackTime = Time.time;
            }
        }
    }
}