using UnityEngine;
using System.Collections;

public class EnemyPatrol : Enemy
{
    public LayerMask enemyMask;
    public float speed = 1;
    Rigidbody2D myBody;
    Transform myTrans;
    float myWidth, myHeight;

    protected override void Start() {
        base.Start();
        myTrans = this.transform;
        myBody = this.GetComponent<Rigidbody2D>();
        SpriteRenderer mySprite = this.GetComponent<SpriteRenderer>();
        myWidth = mySprite.bounds.extents.x;
        myHeight = mySprite.bounds.extents.y;
    }

    void FixedUpdate () {

        //Use this position to cast the isGrounded/isBlocked lines from
        Vector2 lineCastPos = myTrans.position.toVector2() - myTrans.right.toVector2() * myWidth + Vector2.up * myHeight;
        //Check to see if there's ground in front of us before moving forward
        Debug.DrawLine(lineCastPos, lineCastPos + Vector2.down);
        bool isGrounded = Physics2D.Linecast(lineCastPos, lineCastPos + Vector2.down, enemyMask);
        //Check to see if there's a wall in front of us before moving forward
        Debug.DrawLine(lineCastPos, lineCastPos - myTrans.right.toVector2() * .05f);
        bool isBlocked = Physics2D.Linecast(lineCastPos, lineCastPos - myTrans.right.toVector2() * .05f, enemyMask);

        //If theres no ground, turn around. Or if I hit a wall, 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;

    }
}