using System.Collections;
using UnityEngine;

public class ObjectBehaviour : MonoBehaviour {

    //Variables
    Vector3 DestroyPtPos;
    Rigidbody rb;
    GameObject[] pieceList; //array of debris after explode
    Renderer rd;

    //public variables
    public float speed = 2f; // Speed
    public float cubeSize = 0.15f; //size of debris after explode
    public int noOfPieces = 30; //no of debris

    void Start() {
        //get Destroy position
        GameObject destroyPt = GameObject.Find("DestroyPoint");
        DestroyPtPos = destroyPt.transform.position;

        //get rigidbody
        rb = GetComponent<Rigidbody>();

        //get renderer
        rd = GetComponent<Renderer>();
    }

    // Update is called once per frame
    void Update () {
        //make objects fly to camera
        // takes 5 sec for it to reach the camera
        transform.position = Vector3.MoveTowards(transform.position, DestroyPtPos, speed * Time.deltaTime);
    }

    private void OnTriggerEnter(Collider other) {
        //if object collide DestroyPoint
        if (other.gameObject.name == "DestroyPoint") {
            print("collided");
            //to make object untouchable
            rb.isKinematic = false;
            rb.detectCollisions = false;

            //make object disappear
            rd.enabled = false;

            //explode after it touches DestroyPoint
            explode();
            //clear debris after 1 sec of explode
            StartCoroutine(delPieces());

            //decrease totalobjects count since 1 is destroyed
            Spawner.objectDestroyed = true;
        }
    }

    void explode() {
        //For loop to create 30 pieces as debris after explode
        int x = 50;
        pieceList = new GameObject[noOfPieces];
        for (int i = 0; i < noOfPieces; i++) {
            pieceList[i] = createPiece(x);
            x *= -1;
        }
    }

    public GameObject createPiece(int x) {
        //create piece
        GameObject piece;
        piece = GameObject.CreatePrimitive(PrimitiveType.Cube);

        //set piece position and scale and rotation
        piece.name = "Debris";
        piece.transform.position = transform.position + new Vector3(cubeSize, cubeSize, cubeSize);
        piece.transform.localScale = new Vector3(cubeSize, cubeSize, cubeSize);
        piece.transform.localEulerAngles = new Vector3(cubeSize * x, cubeSize * x, cubeSize * x);
        //add rigidbody and set mass
        piece.AddComponent<Rigidbody>();
        piece.GetComponent<Rigidbody>().mass = 0.05f;
        //add color
        piece.GetComponent<Renderer>().material.color = new Color(1, 1, 1, 1);

        return piece;
    }

    private IEnumerator delPieces() {
        //Clear debris after 1 seconds
        yield return new WaitForSeconds(1);
        foreach (GameObject item in pieceList) {
            Destroy(item);
        }
        pieceList = new GameObject[0];
        yield return new WaitForSeconds(5);
        Destroy(gameObject);
    }
}