using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using Code.Infrastructure.Configs;
using Code.Infrastructure.EventBus;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.Audio;
using UnityEngine.Pool;
using UnityEngine.ResourceManagement.AsyncOperations;
using Object = UnityEngine.Object;

namespace Code.Infrastructure.Audio
{
    public interface IAudioSourcePool
    {
        AudioSource GetSource(AudioSourceType sourceType);
        void ReleaseSource(AudioSource source);
    }

    public class AudioSourcePool : IAudioSourcePool, IDisposable
    {
        // The pool holds plain GameObjects (you can swap this for any component type).
        private IObjectPool<AudioSource> _pool; 
        private GameObject _sourcePrefab;

        private Dictionary<AudioSourceType, AudioSourceSettingsConfig> _settings;
        
        public AudioSourcePool(Dictionary<AudioSourceType, AudioSourceSettingsConfig> settings) => _settings = settings;
        
        private string _configsLabel;
        private AsyncOperationHandle<IList<AudioSourceSettingsConfig>> _handles;
        private AssetReference _sourcePrefabConfigReference;
        private AsyncOperationHandle<AudioSourcePrefabConfig> _prefabConfigHandle;
        private AsyncOperationHandle<GameObject> _prefabHandle;
        private EventBus.EventBus _eventBus;
        
        public AudioSourcePool(IConfigLocator configLocator, EventBus.EventBus eventBus)
        {
            _eventBus = eventBus;
            
            _configsLabel = configLocator.TryGetManyConfigAssetReferences<AudioSourceSettingsConfig>();
            _sourcePrefabConfigReference = configLocator.TryGetConfigAssetReference<AudioSourcePrefabConfig>();
            
            LoadConfigs().Forget();
        }

        private async UniTaskVoid LoadConfigs()
        {
            _prefabConfigHandle = Addressables.LoadAssetAsync<AudioSourcePrefabConfig>(_sourcePrefabConfigReference);
            _handles = Addressables.LoadAssetsAsync<AudioSourceSettingsConfig>(_configsLabel);
            
            await UniTask.WhenAll(
                _prefabConfigHandle.ToUniTask(),
                _handles.ToUniTask());

            _prefabHandle = Addressables.LoadAssetAsync<GameObject>(_prefabConfigHandle.Result.sourcePrefab);
            
            _settings = _handles.Result.ToDictionary(x => x.sourceType);
            
            await _prefabHandle.ToUniTask();
            
            _pool = new ObjectPool<AudioSource>(
                createFunc: CreateItem,
                // actionOnGet: OnGet,
                actionOnRelease: OnRelease,
                actionOnDestroy: OnDestroyItem,
                collectionCheck: true,   // helps catch double-release mistakes
                defaultCapacity: 10,
                maxSize: 20
            );
            
            _eventBus.RaiseEvent<IAudioSourcePoolInitializedHandle>(x => x.AudioSourcePoolInitialized());
        }
        // Creates a new pooled GameObject the first time (and whenever the pool needs more).
        private AudioSource CreateItem()
        {
            var audioSource = Object.Instantiate(_prefabHandle.Result).GetComponent<AudioSource>();
            audioSource.name = "PooledAudioSource";
            Object.DontDestroyOnLoad(audioSource);
            return audioSource;
        }

        // Called when an item is taken from the pool.
        private void OnGet(AudioSource source)
        {
            //source.gameObject.SetActive(true);
        }

        // Called when an item is returned to the pool.
        private void OnRelease(AudioSource source)
        {
            source.Stop();
            source.resource = null;
            //source.gameObject.SetActive(false);
        }

        // Called when the pool decides to destroy an item (e.g., above max size).
        private void OnDestroyItem(AudioSource source)
        {
            Object.Destroy(source.gameObject);
        }
        
        public AudioSource GetSource(AudioSourceType sourceType)
        {
            var source = _pool.Get();
            
            source.spatialBlend = _settings[sourceType].spatialBlend;
            
            return source;
        }

        public void ReleaseSource(AudioSource source) => _pool.Release(source);
        
        public void Dispose()
        {
            Addressables.Release(_handles);
            Addressables.Release(_prefabConfigHandle);
            if(_sourcePrefab) Addressables.Release(_sourcePrefab);
        }
    }

    public interface IAudioSourcePoolInitializedHandle : IGlobalSubscriber
    {
        void AudioSourcePoolInitialized();
    }
}