using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
#if UNITY_EDITOR
using UnityEditor.AddressableAssets;
#endif
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;
using UnityEngine.ResourceManagement.ResourceProviders;
using UnityEngine.SceneManagement;

namespace DDD
{
    public class AssetManager : Singleton<AssetManager>, IManager
    {
        public void Init()
        {
            
        }

        public async void PostInit()
        {
            try
            {
                await Addressables.InitializeAsync().Task;
            }
            catch (Exception e)
            {
                Debug.Assert(false, $"Addressables initialization failed\n{e}");
            }
        }

        public static async Task<T> LoadAsset<T>(string key) where T : UnityEngine.Object
        {
            var handle = Addressables.LoadAssetAsync<T>(key);
            await handle.Task;
            
            if (handle.Status == AsyncOperationStatus.Succeeded)
                return handle.Result;

            Debug.LogError($"Addressable load failed : {key}");
            return null;
        }
        
        public static async Task<T> LoadAsset<T>(AssetReference reference) where T : UnityEngine.Object
        {
            if (reference == null)
            {
                Debug.LogError("Null AssetReference");
                return null;
            }

            var handle = reference.LoadAssetAsync<T>();
            await handle.Task;

            if (handle.Status == AsyncOperationStatus.Succeeded)
                return handle.Result;

            Debug.LogError($"AssetReference load failed: {reference.RuntimeKey}");
            return null;
        }

        public static async Task<List<T>> LoadAssetsByLabel<T>(string label) where T : UnityEngine.Object
        {
            var handle = Addressables.LoadAssetsAsync<T>(label, null);
            await handle.Task;

            if (handle.Status == AsyncOperationStatus.Succeeded)
                return handle.Result.ToList();

            Debug.LogError($"[AssetManager] Failed to load assets with label: {label}");
            return new List<T>();
        }

        public static async Task<SceneInstance> LoadScene(string key, LoadSceneMode mode = LoadSceneMode.Additive)
        {
            var handle = Addressables.LoadSceneAsync(key, mode);
            await handle.Task;

            if (handle.Status == AsyncOperationStatus.Succeeded)
                return handle.Result;

            Debug.LogError($"Scene load failed: {key}");
            return default;
        }

        public static async Task UnloadScene(SceneInstance sceneInstance)
        {
            var handle = Addressables.UnloadSceneAsync(sceneInstance);
            await handle.Task;
        }
        
        public static bool HasLabel(string addressKey, string label)
        {
#if UNITY_EDITOR
            var settings = AddressableAssetSettingsDefaultObject.Settings;
            if (settings == null) return false;

            var entry = settings.groups
                .SelectMany(g => g.entries)
                .FirstOrDefault(e => e.address == addressKey);

            if (entry == null) return false;

            return entry.labels.Contains(label);
#else
    return true;
#endif
        }
    }
}