using UnityEngine;

public class Ball : MonoBehaviour {

    //config params
    [SerializeField] Paddle paddle1;
    [SerializeField] float xPush = 2f;
    [SerializeField] float yPush = 15f;
    [SerializeField] AudioClip[] ballSounds;
    [SerializeField] float randomFactor = 0.2f;

    //state
    Vector2 paddleToBallVector;
    private bool hasStarted = false;
    Vector2 paddlePos;


    // cached component references
    AudioSource audioSource;
    Rigidbody2D rb;

    // Start is called before the first frame update
    void Start() {
        paddleToBallVector = transform.position - paddle1.transform.position;
        audioSource = GetComponent<AudioSource>();
        rb = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    void Update() {
        if (!hasStarted) {
            LockBallToPaddle();
            LaunchOnClick();
        }
    }

    private void LaunchOnClick() {
        if (Input.GetMouseButtonDown(0)) {
            hasStarted = true;
            rb.velocity = new Vector2(xPush, yPush);
        }
    }

    private void LockBallToPaddle() {
        paddlePos = new Vector2(paddle1.transform.position.x, paddle1.transform.position.y);
        Debug.Log(paddlePos);
        transform.position = paddlePos + paddleToBallVector;
    }

    private void OnCollisionEnter2D(Collision2D collision) {
        Vector2 velocityTweak = new Vector2(Random.Range(0f, randomFactor), Random.Range(0f, randomFactor));
        if (hasStarted) {
            AudioClip clip = ballSounds[Random.Range(0, ballSounds.Length)];
            audioSource.PlayOneShot(clip);
            rb.velocity += velocityTweak;
        }
    }

    public void Reset() {
        hasStarted = false;
        LockBallToPaddle();
    }

}