using System.Linq;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.IO;

namespace BFEditor.Build
{	
	public class ABCycleDependUtils
	{
	    static AssetBundleManifest manifest;
	
	    public static bool CheckABCycleDepend(string outputPath)
	    {
	        Debug.Log("[bfinfo]检查循环依赖...");
	        manifest = GetManifest(outputPath);
	        if (manifest == null)
	        {
	            return true;
	        }
	
	        var result = true;
	
	        var allABs = manifest.GetAllAssetBundles();
	
	        var totalCount = allABs.Length;
	        var unit = (float)totalCount / 100;
	        var index = 1;
	        var i = 0;
	
	        foreach (var ab in allABs)
	        {
	            if (i >= index * unit)
	            {
	                EditorUtility.DisplayProgressBar("提示", "正在检查ab循环依赖...", (float)index / 100);
	                index++;
	            }
	
	            result = CheckCycleDepend(ab) && result;
	
	            i++;
	        }
	        EditorUtility.ClearProgressBar();
	
	        return result;
	    }
	
	    static AssetBundleManifest GetManifest(string outputPath)
	    {
	        var streamPath = Path.Combine(outputPath, "asset_bundle_manifest.ab");
	        if (!File.Exists(streamPath))
	        {
	            Debug.LogError("文件不存在 " + streamPath);
	            return null;
	        }
	
	        var assetBundle = AssetBundle.LoadFromFile(streamPath);
	        var manifest = assetBundle.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
	        assetBundle.Unload(false);
	        return manifest;
	    }
	
	    static bool CheckCycleDepend(string assetBundle)
	    {
	        var result = true;
	        var depends = manifest.GetAllDependencies(assetBundle);
	
	        foreach (var depend in depends)
	        {
	            var depend2 = manifest.GetAllDependencies(depend);
	            if (depend2.Contains(assetBundle))
	            {
	                Debug.LogError("存在循环依赖 " + assetBundle + "  " + depend);
	                result = false;
	            }
	        }
	
	        return result;
	    }
	}
}