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

public class Enemy : MonoBehaviour
{

    public float visionRadius;
    public float attackRadius;
    public float speed;

    GameObject player;

    Vector3 initialPosition;
    Vector3 target;

    Animator anim;
    Rigidbody2D rb2d;

    private void Start() {
        player = GameObject.FindGameObjectWithTag("Player");

        initialPosition = transform.position;
        target = initialPosition;

        anim = GetComponent<Animator>();
        rb2d = GetComponent<Rigidbody2D>();
    }

    private void Update() {

        RaycastHit2D hit = Physics2D.Raycast(transform.position, player.transform.position - transform.position, visionRadius, 1 << LayerMask.NameToLayer("Default"));

        Vector3 forward = transform.TransformDirection(player.transform.position - transform.position);
        Debug.DrawRay(transform.position, forward, Color.red);

        if (hit.collider != null) {
            if (hit.collider.tag == "Player") {
                target = player.transform.position;
            }
        }

        float distance = Vector3.Distance(target, transform.position);
        Vector3 dir = (target - transform.position).normalized;

        if (target != initialPosition && distance < attackRadius) {
            anim.SetFloat("movX", dir.x);
            anim.SetFloat("movY", dir.y);
            anim.Play("Enemy_Walk");
            anim.speed = 0;
        } else if (target != initialPosition && distance < visionRadius && distance > attackRadius) {
            rb2d.MovePosition(transform.position + dir * speed * Time.deltaTime);
            anim.speed = 1;
            anim.SetFloat("movX", dir.x);
            anim.SetFloat("movY", dir.y);
            anim.SetBool("walking", true);
        } else if (distance > visionRadius) {
            target = initialPosition;
        }

        if (target == initialPosition && distance < 0.02f) {
            transform.position = initialPosition;
            anim.SetBool("walking", false);
        }

        Debug.DrawLine(transform.position, target, Color.green);
    }

    private void OnDrawGizmosSelected() {
        Gizmos.color = Color.yellow;
        Gizmos.DrawWireSphere(transform.position, visionRadius);
        Gizmos.DrawWireSphere(transform.position, attackRadius);
    }
}