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

public class Enemy_Oppossum : MonoBehaviour {

    public LayerMask enemyMask;
    public float speed = 2;
    Rigidbody2D myBody;
    Transform myTrans;
    float myWidth, myHeight;

	// Use this for initialization
	void Start () {
        myTrans = this.transform;
        myBody = this.GetComponent<Rigidbody2D>();
        SpriteRenderer mySprite = this.GetComponent<SpriteRenderer>();
        myWidth = mySprite.bounds.extents.x;
        myHeight = mySprite.bounds.extents.y;
	}

	// Update is called once per frame
	void Update () {

        // Check to see if theres ground in front of us before moving forward
        Vector2 lineCastPos = myTrans.position.toVector2() - myTrans.right.toVector2() * myWidth + Vector2.up * myHeight;
        Debug.DrawLine(lineCastPos, lineCastPos + Vector2.down);
        bool isGrounded = Physics2D.Linecast(lineCastPos, lineCastPos + Vector2.down, enemyMask);
        Debug.DrawLine(lineCastPos, lineCastPos - myTrans.right.toVector2() * 0.05f);
        bool isBlocked = Physics2D.Linecast(lineCastPos, lineCastPos -myTrans.right.toVector2() * 0.02f, enemyMask);

        //If there's no ground, turn around or if I am blocked, turn around
        if (!isGrounded || isBlocked)
        {
            Vector3 currRot = myTrans.eulerAngles;
            currRot.y += 180;
            myTrans.eulerAngles = currRot;
        }

        // Always move forward
        Vector2 myVel = myBody.velocity;
        myVel.x = -myTrans.right.x * speed;
        myBody.velocity = myVel;
	}
}