TowerController

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

public class TowerController : MonoBehaviour
{
    // Start is called before the first frame update
    public int damage = 1;
    public float speed = 4;
    public float radius = 20;
    public float curTime;
    public int level = 1;
    public int priceUpgrade = 200;
    public int priceSell = 150;

    private GameObject[] enemy;
    private GameObject closestEnemy;
    private GameObject myBase;
    public void LevelUp()
    {
        level++;
        speed = speed - (speed * 0.1f);
        radius = radius + (radius * 0.1f);
        damage = damage + (int)(damage * 0.1f);
        priceUpgrade = priceUpgrade + (int)(priceUpgrade * 0.1f);
        priceSell = priceSell + (int)(priceSell * 0.1f);
    }
    void Start()
    {
        curTime = speed;
        CapsuleCollider m_collider = GetComponent<CapsuleCollider>();
        m_collider.radius = radius;
        myBase = GameObject.FindGameObjectWithTag("Base");
    }

    // Update is called once per frame
    void Update()
    {
        curTime = curTime + Time.deltaTime;
        Collider[] enemyes = Physics.OverlapSphere(transform.position, radius);
        float distance = float.MaxValue;
        closestEnemy = null;
        foreach(Collider obj in enemyes)
        {
            if(obj.gameObject.tag == "Enemy")
            {
                if(Vector3.Distance(myBase.transform.position,
                    obj.gameObject.transform.position) < distance)
                {
                    distance = Vector3.Distance(myBase.transform.position,
                    obj.gameObject.transform.position);
                    closestEnemy = obj.gameObject;
                }
            }
        }
        if(closestEnemy != null)
        {
            Attack(closestEnemy);
        }
    }

    void Attack(GameObject enemy)
    {
        if (curTime >= speed)
        {
            Debug.Log("Attack");
            curTime = 0;
            MonsterController monster = enemy.GetComponent<MonsterController>();
            monster.hp -= damage;
            monster.AttackIndicate();
        }
    }
    /*
    void OnTriggerStay(Collider other)
    {
        enemy = GameObject.FindGameObjectsWithTag("Enemy");

        if (other.gameObject.tag == "Enemy")
        {
            //Debug.Log(other.gameObject.name);
            Attack(other.gameObject);
        }
    }*/

    void OnDrawGizmos()
    {
        Gizmos.color = Color.green;
        Gizmos.DrawWireSphere(transform.position, radius);

    }

    /*
    GameObject FindClosesEnemy()
    {
        float distance = Mathf.Infinity;
        Vector3 position = transform.position;
        GameObject closest;
        foreach (GameObject go in enemy)
        {
            Vector3 diff = go.transform.position - position;
            float curDistance = diff.sqrMagnitude;
            if(curDistance < distance)
            {
                closest = go;
                distance = curDistance;
            }
        }
        return closest;
    }*/
}