campfire/Assets/Scripts/CasettePickup.cs

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

[RequireComponent(typeof(AudioSource))]
public class CasettePickup : MonoBehaviour {
    public AudioClip[] Clips;
    public string DisplayPrompt {
        get {
            return (PreviousInQueue != null && PreviousInQueue.Playing) ? "Queue casette" : "Play casette";
        }
    }
    public bool Playing {
        get {
            return Source.isPlaying;
        }
    }
    public bool PickedUp = false;

    private AudioSource Source;
    private CasettePickup PreviousInQueue;
    private int WaitingIndex;

    private void Awake() {
        Source = GetComponent<AudioSource>();
        CasetteProgress.CasetteCount = Clips.Length;
    }

    private void Update() {
        if (PickedUp) {
            transform.localScale = Vector3.Lerp(transform.localScale, Vector3.zero, 10f * Time.deltaTime);
        }

        if (PreviousInQueue != null) {
            if (!PreviousInQueue.Playing) {
                PreviousInQueue = null;
                Source.PlayOneShot(Clips[WaitingIndex]);
            } else if (PreviousInQueue == null && !Source.isPlaying) {
                Destroy(gameObject);
            }
        } else if (CasetteProgress.AllCasettesPlayed && !Playing) {
            Destroy(gameObject);
        }
    }

    public void Play(CasettePickup previous) {
        PickedUp = true;
        int Index = CasetteProgress.PlayNext();
        if (Index != -1) {
            if (previous == null) {
                Source.PlayOneShot(Clips[Index]);
            } else {
                PreviousInQueue = previous;
                WaitingIndex = Index;
            }
        }
    }
}