using System;
using UnityEngine;

namespace LiveOpsExamples
{
  /// <summary>
  /// A collectible snack. Bobs gently (sine, 0.08 world units amplitude, 650 ms
  /// half-period — mirrors the Phaser yoyo tween) and raises <see cref="Collected"/>
  /// when the player overlaps its trigger, then destroys itself.
  /// </summary>
  [RequireComponent(typeof(SpriteRenderer))]
  public class Snack : MonoBehaviour
  {
    private const float BobAmplitude = 0.08f;
    private const float BobHalfPeriodSeconds = 0.65f;

    public SpriteRenderer Player { get; set; }

    public event Action<Snack> Collected;

    private Vector3 _basePosition;
    private float _elapsed;

    private void Start()
    {
      _basePosition = transform.position;
    }

    private void Update()
    {
      _elapsed += Time.deltaTime;
      var offset = Mathf.Sin(_elapsed * Mathf.PI / BobHalfPeriodSeconds) * BobAmplitude;
      transform.position = _basePosition + new Vector3(0f, offset, 0f);
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
      if (Player == null || other.gameObject != Player.gameObject)
        return;

      Collected?.Invoke(this);
      Destroy(gameObject);
    }
  }
}