using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BulletEnemy : MonoBehaviour
{
    TroopsHealth currentHealth;
    TroopsHealth realDamage;

    private Transform target;

    public float speed = 70f;

    public int damage = 50;

    public float armor = 1;

    public float explosionRadius = 0f;
    public GameObject impactEffect;

    public void Seek(Transform _target)
    {
        target = _target;
    }

    void Update()
    {
        if (target == null)
        {
            Destroy(gameObject);
            return;
        }

        Vector3 dir = target.position - transform.position;
        float distanceThisFrame = speed * Time.deltaTime;

        if (dir.magnitude <= distanceThisFrame)
        {
            HitTarget();
            return;
        }

        transform.Translate(dir.normalized * distanceThisFrame, Space.World);
        transform.LookAt(target);
    }

    void HitTarget()
    {
        GameObject effectIns = (GameObject)Instantiate(impactEffect, transform.position, transform.rotation);
        Destroy(effectIns, 2f);

        if (explosionRadius > 0f)
        {
            Explode();
        }
        else
        {
            Damage(target);
        }

        Destroy(gameObject);
    }

    void Explode()
    {
        Collider[] colliders = Physics.OverlapSphere(transform.position, explosionRadius);
        foreach (Collider collider in colliders)
        {
            if (collider.tag == "Troops")
            {
                Damage(collider.transform);
            }
        }
    }

    void Damage(Transform troops)
    {

        TroopsHealth e = troops.GetComponent<TroopsHealth>();

        if (e != null)
        {
            e.TakeDamage(damage);
        }
    }

    public void TakeDamage(float amount)
    {
        var realDamage = amount - amount * .03f * armor;
        realDamage = Mathf.Max(1, realDamage);
        currentHealth -= realDamage;
    }

        void OnDrawGizmosSelected()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawWireSphere(transform.position, explosionRadius);
    }
}