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

public class BackgroundScrollController : MonoBehaviour {

    [SerializeField] GameObject roadGameObject;
    [SerializeField] float scrollSpeed = 5f;
    [SerializeField] float timeBetweenRoads = .5f;
    [SerializeField] float destroyAfterSeconds = 2f;

    // Use this for initialization
    void Start () {
        StartCoroutine(BackgroundScroll());
    }

    private IEnumerator BackgroundScroll()
    {
        // Instantiates road as a gameobject, sets the velocity to scroll downwards, and then destroys it after a set amount of time.
        GameObject road = Instantiate(roadGameObject, new Vector3 (transform.position.x, transform.position.y, 5), Quaternion.identity) as GameObject;
        road.transform.parent = transform;
        road.GetComponent<Rigidbody2D>().velocity = new Vector2(0, -scrollSpeed);
        Destroy(road, destroyAfterSeconds);

        // Waiting to restart the coroutine
        yield return new WaitForSeconds(timeBetweenRoads);

        StartCoroutine(BackgroundScroll());
    }
}