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

public class Enemy_Wander_Script : MonoBehaviour
{
    public int speed = 4;
    public bool doesIdle = true;
    public bool doesFall = false;
    public float wakeDistance = 15;
    public int enemyLayer = 9;

    private float moveX;
    private float width;
    private float height;

    private int idleTime = 0;

    private void Start()
    {
        SpriteRenderer sprite = GetComponent<SpriteRenderer>();
        width = GetComponent<SpriteRenderer>().bounds.size.x;
        height = GetComponent<SpriteRenderer>().bounds.size.y;

        Vector2 localScale = gameObject.transform.localScale;
        moveX = localScale.x < 0 ? -1 : 1;
    }

    void Update()
    {
        if (Static_GlobalStats.paused) {
            GetComponent<Animator>().SetFloat("speed", 0);
            return;
        }

        if (gameObject.transform.position.y < -100)
        {
            Destroy(gameObject);
            return;
        }

        if (gameObject.GetComponent<Collider2D>().enabled && Vector2.Distance(gameObject.transform.position, GameObject.FindWithTag("Player").transform.position) < wakeDistance)
        {
            Rigidbody2D rigidbody = gameObject.GetComponent<Rigidbody2D>();

            if (doesIdle && Random.Range(0, 1000) <= 1) idleTime = Random.Range(20, 300);

            if (idleTime > 0)
            {
                idleTime--;
            }
            else
            {
                rigidbody.velocity = new Vector2(moveX * speed, rigidbody.velocity.y);
            }

            GetComponent<Animator>().SetFloat("speed", Mathf.Abs(rigidbody.velocity.x));
            GetComponent<Animator>().SetBool("grounded", true);

            int layerMask = ~(1 << enemyLayer);

            for (float y = gameObject.transform.position.y - height * 0.55f; y <= gameObject.transform.position.y + height * 0.55f; y += 0.1f)
            {
                RaycastHit2D frontalHit = Physics2D.Raycast(new Vector2(gameObject.transform.position.x, y), new Vector2(moveX, 0), width * 0.55f, layerMask);
                if (frontalHit.collider && frontalHit.collider.tag != "Collectable" && frontalHit.collider.tag != "Projectile" && frontalHit.collider.tag != "Player")
                {
                    flipEnemy();
                    break;
                }
            }

            if (!doesFall)
            {
                RaycastHit2D groundHit = Physics2D.Raycast(new Vector2(gameObject.transform.position.x + moveX * width * 0.55f, gameObject.transform.position.y), Vector2.down, 2 * height, layerMask);
                if (!groundHit.collider)
                {
                    flipEnemy();
                }
            }
        }
    }

    void flipEnemy()
    {
        moveX = -moveX;

        Vector2 localScale = gameObject.transform.localScale;
        localScale.x *= -1;
        transform.localScale = localScale;
    }
}