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

namespace BFEditor.Build
{
	public class CompareAssetBundleWindow : EditorWindow
	{
		private string newestABPath = "";
		private string lastABPath = "";
		public bool IsAndroid = true;
		private List<string> ABList = new List<string>();
		Vector2 resultScrollPos;
	    public CompareAssetBundleWindow()
	    {
	        titleContent = new GUIContent("AssetBundle对比");
	    }

	    private void OnEnable()
		{
			GetNewestABPath();
		}

	    void OnGUI()
	    {
			GUILayout.Space(18);
	        GUILayout.BeginHorizontal();
	        GUILayout.Label("当前版本AB路径");
	        GUILayout.TextField(newestABPath, GUILayout.Width(600));
	        if (GUILayout.Button("选择", GUILayout.Width(80)))
	        {
	            string openPath = EditorUtility.OpenFolderPanel("select ab path", newestABPath, "");
	            if (openPath.CompareTo("") != 0){
	                newestABPath = openPath;
	            }
	        }
	        GUILayout.EndHorizontal();
	        GUILayout.Space(10);

			GUILayout.BeginHorizontal();
	        GUILayout.Label("上个版本AB路径");
	        GUILayout.TextField(lastABPath, GUILayout.Width(600));
	        if (GUILayout.Button("选择", GUILayout.Width(80)))
	        {
	            string openPath = EditorUtility.OpenFolderPanel("select ab path", lastABPath, "");
	            if (openPath.CompareTo("") != 0){
	                lastABPath = openPath;
	            }
	        }
	        GUILayout.EndHorizontal();
			GUILayout.Space(10);

			GUILayout.BeginHorizontal();
	        GUILayout.Space(150);
	        if (GUILayout.Button("对比", GUILayout.Width(200), GUILayout.Height(40)))
	        {
				CheckMD5AndAssetHash();
	        }

			GUILayout.Space(100);
			if (GUILayout.Button("使用上个版本的AB修复", GUILayout.Width(200), GUILayout.Height(40)))
	        {
				UseLastABFix();
	        }
	        GUILayout.EndHorizontal();
	        GUILayout.Space(30);

			DrawResult();
	    }

		private void DrawResult()
	    {
			resultScrollPos = GUILayout.BeginScrollView(resultScrollPos, GUILayout.Width(800), GUILayout.Height(620));
            for (int i = ABList.Count - 1; i >= 0; i--)
            {
                var path = ABList[i];

                GUILayout.BeginHorizontal();
                GUILayout.Space(20);
				EditorGUILayout.TextField(path);

                GUILayout.Space(10);

                GUILayout.EndHorizontal();
            }
            GUILayout.EndScrollView();
		}

		private void CheckMD5AndAssetHash()
		{
			if (string.IsNullOrEmpty(newestABPath))
			{
				return;
			}
			if (string.IsNullOrEmpty(lastABPath))
			{
				return;
			}
			ABList.Clear();
			var manifestPath = System.IO.Path.Combine(newestABPath, "asset_bundle_manifest.ab");
			var manifestAB = AssetBundle.LoadFromFile(manifestPath);
            var Manifest = manifestAB.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
            manifestAB.Unload(false);

			var lastManifestPath = System.IO.Path.Combine(lastABPath, "asset_bundle_manifest.ab");
			var lastManifestAB = AssetBundle.LoadFromFile(lastManifestPath);
            var lastManifest = lastManifestAB.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
            lastManifestAB.Unload(false);

			var allAB = Manifest.GetAllAssetBundles();
			foreach(var path in allAB)
			{
				if (path.Contains("ab_config.bytes") || path.Contains("asset_bundle_manifest.ab"))
				{
					continue;
				}
				var fullPathA = Path.Combine(newestABPath, path);
				var fullPathB = Path.Combine(lastABPath, path);
				if (File.Exists(fullPathB) && BF.GameLaunchUtils.GetFileMD5(fullPathA).CompareTo(BF.GameLaunchUtils.GetFileMD5(fullPathB)) != 0)
				{
					if (Manifest.GetAssetBundleHash(path) == lastManifest.GetAssetBundleHash(path))
					{
						// md5 不一致但是AssetHash一致的情况
						ABList.Add(path);
					}
				}
			}
		}

		private void UseLastABFix()
		{
			if (string.IsNullOrEmpty(newestABPath))
			{
				return;
			}
			if (string.IsNullOrEmpty(lastABPath))
			{
				return;
			}
			if (ABList.Count == 0)
			{
				return;
			}
			foreach(var path in ABList)
			{
				var fullPathA = Path.Combine(newestABPath, path);
				var fullPathB = Path.Combine(lastABPath, path);
				File.Copy(fullPathB, fullPathA, true);
			}
			var version = newestABPath.Substring(newestABPath.Replace("\\", "/").LastIndexOf("/") + 1);
			AssetBundleUtils.RegenerateABConfigMd5(newestABPath, version);

			ABList.Clear();
		}

	    public static void ShowWindow()
	    {
	        var window = GetWindow<CompareAssetBundleWindow>();
	        window.Show();
	    }

		private void GetNewestABPath()
		{
			var bundleCachePath = IsAndroid ? Application.dataPath + "/../HistoryAssetBundles" : Application.dataPath + "/../HistoryAssetBundles/IOS";
			var dirInfo = new DirectoryInfo(bundleCachePath);
            var dirs = dirInfo.GetDirectories();
			if (dirs.Length == 0)
			{
				newestABPath = "";
				lastABPath = "";
			}
			if (dirs.Length == 1)
			{
				newestABPath = dirs[0].FullName;
				lastABPath = "";
			}
			var hightestIndex = 0;
			var secondIndex = 0;
            for (var i = 1; i < dirs.Length; i++)
            {
				if (dirs[i].FullName.CompareTo(dirs[hightestIndex].FullName) > 0)
				{
					secondIndex = hightestIndex;
					hightestIndex = i;
				}
            }
			newestABPath = dirs[hightestIndex].FullName;
			if (hightestIndex > 0)
			{
				lastABPath = dirs[secondIndex].FullName;
			}
		}
	}
}