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

namespace Management
{
    /// <summary>
    /// Single drive to play all SFX in game.  Contains a limiter that limits amount of times
    /// any one clip will play to prevent volume runaways and other sound wave based oddities.
    /// </summary>
    [RequireComponent(typeof(AudioSource))]
    public class SFX : MonoBehaviour
    {
        // The maximum number any individual clip can be played.
        [SerializeField] private int maxActiveClips;
        
        // singleton pattern
        private static SFX _instance;
        
        // audio driver
        private AudioSource _audioSource;
        
        // Playing clip registry.  Used as data source to limit amount of times a clip will play simultaneously
        private Dictionary<AudioClip, int> _clipsInProgress;
        
        /// <summary>
        /// Plpays the given audio clip through the audio driver
        /// </summary>
        /// <param name="clip">The sound to play</param>
        /// <param name="volume">The normalized volume it will play at</param>
        public void PlayOneShot(AudioClip clip, float volume = 1f)
        {
            if (clip == null) return;
            if (!_clipsInProgress.TryAdd(clip, 1))
            {
                if (_clipsInProgress[clip] >= maxActiveClips) return;
                _clipsInProgress[clip]++;
            }
            
            _audioSource.PlayOneShot(clip, volume);
            StartCoroutine(ClearClip(clip));
        }
        
        // Coroutine to clear registry once sound is finished.
        private IEnumerator ClearClip(AudioClip clip)
        {
            yield return new WaitForSeconds(clip.length);
            _clipsInProgress[clip]--;
            if  (_clipsInProgress[clip] <= 0) _clipsInProgress.Remove(clip);
        }
        
        private void Awake()
        {
            if (_instance != null && _instance != this)
            {
                Destroy(gameObject);
                return;
            }        
            
            _instance = this;
            DontDestroyOnLoad(gameObject);
            _audioSource = GetComponent<AudioSource>();
        }
    }
}