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

public class enemyMoving : MonoBehaviour
{
    // Rigidbody reference
    private Rigidbody2D rb2d;

    // moveSpeed of the enemy, edit in inspector
    [SerializeField] private float moveSpeed;
    // check distance, edit in inspector
    [SerializeField] private float distance;
    // change in inspector to see changes
    [SerializeField] private Vector2 checkOffset;

    // the ray origin
    Vector2 checkPosition;
    // direction of the enemy
    // 1 = right
    // -1 = left
    float direction = 1;

    void Start()
    {
        rb2d = GetComponent<Rigidbody2D>();
    }

    private void FixedUpdate()
    {
        direction = Mathf.Sign(moveSpeed);
        checkPosition = new Vector2(transform.position.x + checkOffset.x * direction,
            transform.position.y + checkOffset.y);

        RaycastHit2D hitInfo = Physics2D.Raycast(checkPosition, Vector2.down, distance);
        if (hitInfo.collider == null)
        {
            moveSpeed *= -1;
            transform.localScale = new Vector2(Mathf.Sign(moveSpeed), 1);
        }
        rb2d.velocity = new Vector2(moveSpeed, rb2d.velocity.y);
    }

    private void OnDrawGizmos()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawLine(new Vector2(transform.position.x + checkOffset.x * direction, transform.position.y + checkOffset.y),
            new Vector2(transform.position.x + checkOffset.x * direction, (transform.position.y + checkOffset.y) - distance));
    }

}