using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using UnityEngine;

#if UNITY_EDITOR
using UnityEditor;
#endif

namespace ETModel
{
	public static class ResourcesHelper
	{
		public static string[] GetDependencies(string assetBundleName)
		{
			string[] dependencies = new string[0];
			if (!Define.IsAsync)
			{
#if UNITY_EDITOR
				dependencies = AssetDatabase.GetAssetBundleDependencies(assetBundleName, true);
#endif
			}
			else
			{
				dependencies = ResourcesComponent.AssetBundleManifestObject.GetAllDependencies(assetBundleName);
			}
			return dependencies;
		}

		public static string[] GetSortedDependencies(string assetBundleName)
		{
			Dictionary<string, int> info = new Dictionary<string, int>();
			List<string> parents = new List<string>();
			CollectDependencies(parents, assetBundleName, info);
			string[] ss = info.OrderBy(x => x.Value).Select(x => x.Key).ToArray();
			return ss;
		}

		public static void CollectDependencies(List<string> parents, string assetBundleName, Dictionary<string, int> info)
		{
			parents.Add(assetBundleName);
			string[] deps = GetDependencies(assetBundleName);
			foreach (string parent in parents)
			{
				if (!info.ContainsKey(parent))
				{
					info[parent] = 0;
				}
				info[parent] += deps.Length;
			}


			foreach (string dep in deps)
			{
				if (parents.Contains(dep))
				{
					throw new Exception($"包有循环依赖，请重新标记: {assetBundleName} {dep}");
				}
				CollectDependencies(parents, dep, info);
			}
			parents.RemoveAt(parents.Count - 1);
		}
	}
}