//#define REPLACE_SAME_TYPE


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



namespace vietlabs.fr2
{
	public class FR2_Export
	{
		// private static int processIndex;
		private const int maxThread = 5;

		//[MenuItem("Assets/FR2/Tools/Merge Duplicates")]

		private static Dictionary<string, ProcessReplaceData> listReplace;
        private static HashSet<string> cacheSelection;


		private static List<Thread> lstThreads;
		public static bool IsMergeProcessing { get; private set; }


		public static void ExportCSV(FR2_Ref[] csvSource)
		{
			var result = FR2_CSV.GetCSVRows(csvSource);
			if (result.Length > 0)
			{
				EditorGUIUtility.systemCopyBuffer = result;
				Debug.Log("[FR2] CSV file content (" + csvSource.Length + " assets) copied to clipboard!");
			}
			else
			{
				Debug.LogWarning("[FR2] Nothing to export!");
			}
		}

		[MenuItem("Assets/FR2/Toggle Ignore", false, 19)]
		private static void Ignore()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return;
			}
			
			Object[] actives = Selection.objects;
			for (var i = 0; i < actives.Length; i++)
			{
				string path = AssetDatabase.GetAssetPath(actives[i]);
				if (path.Equals(FR2_Cache.DEFAULT_CACHE_PATH))
				{
					continue;
				}

				if (FR2_Setting.IgnoreAsset.Contains(path))
				{
					FR2_Setting.RemoveIgnore(path);
				}
				else
				{
					FR2_Setting.AddIgnore(path);
				}
			}
		}

		[MenuItem("Assets/FR2/Copy GUID", false, 20)]
		private static void CopyGUID()
		{
			EditorGUIUtility.systemCopyBuffer = AssetDatabase.AssetPathToGUID(
				AssetDatabase.GetAssetPath(Selection.activeObject)
			);
		}

		[MenuItem("Assets/FR2/Export Selection", false, 21)]
		private static void ExportSelection()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return;
			}
			
			FR2_Unity.ExportSelection();
		}

		[MenuItem("Assets/FR2/Select Dependencies (assets I use)", false, 22)]
		private static void SelectDependencies_wtme()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return;
			}
			
			SelectDependencies(false);
		}

		[MenuItem("Assets/FR2/Refresh")]
		public static void ForceRefreshSelection()
		{
			var guids = Selection.assetGUIDs;
			if (!FR2_Cache.isReady) return; // cache not ready!

			for (var i = 0; i < guids.Length; i++)
			{
				string guid = guids[i];
				if (guid == FR2_Cache.CachePath)
				{
					continue;
				}
				
				if (!FR2_Asset.IsValidGUID(guid))
				{
					continue;
				}

				if (FR2_Cache.Api.AssetMap.ContainsKey(guid))
				{
					FR2_Cache.Api.RefreshAsset(guid, true);
#if FR2_DEBUG
				UnityEngine.Debug.Log("Changed : " + guids[i]);
#endif

					continue;
				}

				FR2_Cache.Api.AddAsset(guid);
			}

			FR2_Cache.Api.Check4Work();
		}

		[MenuItem("Assets/FR2/Select Dependencies included me", false, 23)]
		private static void SelectDependencies_wme()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return;
			}
			
			SelectDependencies(true);
		}

		//[MenuItem("Assets/FR2/Select")] 
		[MenuItem("Assets/FR2/Select Used (assets used me)", false, 24)]
		private static void SelectUsed_wtme()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return;
			}
			
			SelectUsed(false);
		}

		[MenuItem("Assets/FR2/Select Used included me", false, 25)]
		private static void SelectUsed_wme()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return;
			}
			
			SelectUsed(true);
		}

		[MenuItem("Assets/FR2/Export Dependencies", false, 40)]
		private static void ExportDependencies()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return;
			}
			
			var deps = GetSelectionDependencies();
			if (deps == null) return;
			
			Selection.objects = deps.ToArray();
			FR2_Unity.ExportSelection();
		}

		[MenuItem("Assets/FR2/Export Assets (no scripts)", false, 41)]
		private static void ExportAsset()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return;
			}
			
			List<Object> list = GetSelectionDependencies();
			
			for (int i = list.Count - 1; i >= 0; i--)
			{
				if (list[i] is MonoScript)
				{
					list.RemoveAt(i);
				}
			}

			//Debug.Log(i + ":" + list[i] + ":" + list[i].GetType());
			Selection.objects = list.ToArray();
			FR2_Unity.ExportSelection();
		}

		public static void MergeDuplicate(string guid_file)
		{
			// for (int i = 0; i < Selection.objects.Length; i++)
			// {
			//     Object item = Selection.objects[i];
			//     Debug.Log(item.name);
			// }
			//string guid_file = EditorGUIUtility.systemCopyBuffer;
			long toFileId = 0;
			var string_arr = guid_file.Split ('/');
			if (string_arr.Length > 1) {
				toFileId = long.Parse(string_arr[1]);
			}
			string guid = string_arr[0];
			// var wat = new System.Diagnostics.Stopwatch();
			// wat.Start();
			//validate clipboard guid

			string gPath = AssetDatabase.GUIDToAssetPath(guid);
			if (string.IsNullOrEmpty(gPath) || !gPath.StartsWith("Assets/"))
			{
				Debug.LogWarning("Invalid guid <" + guid + "> in clipboard, can not replace !");
				return;
			}

            var temp = FR2_Unity.Selection_AssetGUIDs;//cheat refresh selection, DO NOT delete
            HashSet<string> guids_files = FR2_Unity._Selection_AssetGUIDs;

			var realKey = "";
			foreach (var item in guids_files) {
				if (item.StartsWith (guid_file, System.StringComparison.Ordinal)) {
					realKey = item;
				}
			}
			if (string.IsNullOrEmpty(realKey))
			{
				Debug.LogWarning("Clipboard guid <" + guid +
					"> not found in Selection, you may not intentionally replace selection assets by clipboard guid");
//				foreach (var item in guids_files) {
//					Debug.Log ("item: " + item);
//				}
				return;
			}
			guids_files.Remove(realKey);
            cacheSelection = new HashSet<string>();
            foreach(var item in cacheSelection)
            {
                cacheSelection.Add(item);
            }
			if (guids_files.Count == 0)
			{
				Debug.LogWarning("No new asset selected to replace, must select all duplications to replace");
				return;
			}


            //check asset type, only replace same type
#if REPLACE_SAME_TYPE
            var type1 = AssetDatabase.GetMainAssetTypeAtPath(gPath);
            var importType1 = AssetImporter.GetAtPath(gPath);
#endif


            List<FR2_Asset> assetList = new List<FR2_Asset>();
            var lstFind = new List<string>();
            foreach (var item in guids_files)
            {
                var arr = item.Split('/');

                string g = arr[0];

#if REPLACE_SAME_TYPE
                var p2 = AssetDatabase.GUIDToAssetPath(g);
                var type2 = AssetDatabase.GetMainAssetTypeAtPath(p2);

                if(type1 != type2)
                {
                    Debug.LogWarning("Cannot replace asset: " + p2 + " becase difference type");
                    continue;
                }
                if(type1 == typeof(UnityEngine.Texture2D))
                {
                    var importType2 = AssetImporter.GetAtPath(p2) as TextureImporter;
                    var textureImportType1 = importType1 as TextureImporter;
                    if (importType2 == null || textureImportType1 == null)
                    {
                        Debug.LogWarning("Cannot replace asset: " + p2 + " becase difference type");
                        continue;
                    }
                    if(textureImportType1.textureType != importType2.textureType)
                    {
                        Debug.LogWarning("Cannot replace asset: " + p2 + " becase difference type");
                        continue;
                    }
                    if (textureImportType1.textureType == TextureImporterType.Sprite)
                    {
                        if (textureImportType1.spriteImportMode != importType2.spriteImportMode)
                        {
                            Debug.LogWarning("Cannot replace asset: " + p2 + " becase difference type");
                            continue;
                        }
                    }
                    //Debug.Log("import type " + mainImportType);
                }
                //Debug.Log("type: " + mainType);
#endif
                lstFind.Add(g);

                //                if (arr.Length > 1)
                //                {
                //                    long file = long.Parse(arr[1]);
                //                    
                //                }
            }
            if (lstFind.Count == 0)
            {
                Debug.LogWarning("No new asset selected to replace, must select all duplications to replace");
                return;
            }
            
            assetList = FR2_Cache.Api.FindAssets(lstFind.ToArray(), false);
            
			//replace one by one
			listReplace = new Dictionary<string, ProcessReplaceData>();
			lstThreads = new List<Thread>();
			for (int i = assetList.Count - 1; i >= 0; i--)
			{
				//Debug.Log("FR2 Replace GUID : " + assetList[i].guid + " ---> " + guid + " : " + assetList[i].UsedByMap.Count + " assets updated");
				string fromId = assetList[i].guid;

				List<FR2_Asset> arr = assetList[i].UsedByMap.Values.ToList();
				for (var j = 0; j < arr.Count; j++)
				{
					FR2_Asset a = arr[j];
					if (!listReplace.ContainsKey(a.assetPath))
					{
						listReplace.Add(a.assetPath, new ProcessReplaceData());
					}

					listReplace[a.assetPath].datas.Add(new ReplaceData
					{
						from = fromId,
						to = guid,
						asset = a,

                        toFileId = toFileId
					});
				}
			}

			foreach (KeyValuePair<string, ProcessReplaceData> item in listReplace)
			{
				item.Value.processIndex = item.Value.datas.Count - 1;
			}

			IsMergeProcessing = true;
			EditorApplication.update -= ApplicationUpdate;
			EditorApplication.update += ApplicationUpdate;

			// for (var i = assetList.Count - 1; i >= 0; i--)
			// {
			//     // Debug.Log("FR2 Replace GUID : " + assetList[i].guid + " ---> " + guid + " : " + assetList[i].UsedByMap.Count + " assets updated");
			//     var from = assetList[i].guid;

			//     var arr = assetList[i].UsedByMap.Values.ToList();
			//     for (var j = 0; j < arr.Count; j ++)
			//     {
			//         var a = arr[j];
			//         var result = a.ReplaceReference(from, guid);

			//         if (result && !dictAsset.ContainsKey(a.guid))
			//         {
			//             dictAsset.Add(a.guid, 1);
			//         }
			//     }
			// }
			// Debug.Log("Time replace guid " + wat.ElapsedMilliseconds);
			// wat = new System.Diagnostics.Stopwatch();
			// wat.Start();
			// var listRefresh = dictAsset.Keys.ToList();
			// for (var i = 0; i < listRefresh.Count; i++)
			// {
			//     FR2_Cache.Api.RefreshAsset(listRefresh[i], true);
			// }

			// FR2_Cache.Api.RefreshSelection();
			// FR2_Cache.Api.Check4Usage();
			// AssetDatabase.Refresh();
			// Debug.Log("Time replace guid " + wat.ElapsedMilliseconds);
		}

		private static void ApplicationUpdate()
		{
			bool notComplete = listReplace.Where(x => x.Value.processIndex >= 0).Count() > 0;
			if (lstThreads.Count <= 0 && notComplete)
			{
				foreach (KeyValuePair<string, ProcessReplaceData> item in listReplace)
				{
					if (item.Value.processIndex >= 0)
					{
						ReplaceData a = item.Value.datas[item.Value.processIndex--];
						a.isTerrian = a.asset.type == FR2_AssetType.TERRAIN;
						if (a.isTerrian)
						{
							a.terrainData =
								AssetDatabase.LoadAssetAtPath(a.asset.assetPath, typeof(Object)) as TerrainData;
						}
				
						a.isSucess = a.asset.ReplaceReference(a.from, a.to, a.toFileId, a.terrainData);
					}
				}
			}

			for (int i = lstThreads.Count - 1; i >= 0; i--)
			{
				if (!lstThreads[i].IsAlive)
				{
					lstThreads.RemoveAt(i);
				}
			}
			
			//if (lstThreads.Count <= 0 && !notComplete) //complete 
			{

				foreach (KeyValuePair<string, ProcessReplaceData> item in listReplace)
				{
					List<ReplaceData> lst = item.Value.datas;
					for (var i = 0; i < lst.Count; i++)
					{
						ReplaceData data = lst[i];
						if (!data.isUpdated && data.isSucess)
						{
							data.isUpdated = true;
							if (data.isTerrian)
							{
								EditorUtility.SetDirty(data.terrainData);
								AssetDatabase.SaveAssets();
								data.terrainData = null;
								FR2_Unity.UnloadUnusedAssets();
							}
							else
							{
								AssetDatabase.ImportAsset(data.asset.assetPath, ImportAssetOptions.Default);
							}
						}
					}
				}
			
				var guidsRefreshed = new HashSet<string>();
				EditorApplication.update -= ApplicationUpdate;
				foreach (KeyValuePair<string, ProcessReplaceData> item in listReplace)
				{
					List<ReplaceData> lst = item.Value.datas;
					for (var i = 0; i < lst.Count; i++)
					{
						ReplaceData data = lst[i];
						if (data.isSucess && !guidsRefreshed.Contains(data.asset.guid))
						{
							guidsRefreshed.Add(data.asset.guid);
							FR2_Cache.Api.RefreshAsset(data.asset.guid, true);
						}
					}
				}

				lstThreads = null;
				listReplace = null;
				FR2_Cache.Api.RefreshSelection();
				FR2_Cache.Api.Check4Work();
				
				AssetDatabase.Refresh();
				IsMergeProcessing = false;
			}
		}


		//[MenuItem("Assets/FR2/Tools/Fix Model Import Material")]
		//public static void FixModelImportMaterial(){
		//	if (Selection.activeObject == null) return;
		//	CreatePrefabReplaceModel((GameObject)Selection.activeObject);
		//}

		//[MenuItem("GameObject/FR2/Paste Materials", false, 10)]
		//public static void PasteMaterials(){
		//	if (Selection.activeObject == null) return;

		//	var r = Selection.activeGameObject.GetComponent<Renderer>();
		//	Undo.RecordObject(r, "Replace Materials");
		//	r.materials = model_materials;
		//	EditorUtility.SetDirty(r);
		//}

		//[MenuItem("GameObject/FR2/Copy Materials", false, 10)]
		//public static void CopyMaterials(){
		//	if (Selection.activeObject == null) return;
		//	var r = Selection.activeGameObject.GetComponent<Renderer>();
		//	if (r == null) return;
		//	model_materials = r.sharedMaterials;
		//}

		//-------------------------- APIs ----------------------

		private static void SelectDependencies(bool includeMe)
		{
			List<FR2_Asset> list = FR2_Cache.Api.FindAssets(FR2_Unity.Selection_AssetGUIDs, false);
			var dict = new Dictionary<string, Object>();

			if (includeMe)
			{
				AddToDict(dict, list.ToArray());
			}

			for (var i = 0; i < list.Count; i++)
			{
				AddToDict(dict, FR2_Asset.FindUsage(list[i]).ToArray());
			}

			Selection.objects = dict.Values.ToArray();
		}

		private static void SelectUsed(bool includeMe)
		{
			List<FR2_Asset> list = FR2_Cache.Api.FindAssets(FR2_Unity.Selection_AssetGUIDs, false);
			var dict = new Dictionary<string, Object>();

			if (includeMe)
			{
				AddToDict(dict, list.ToArray());
			}

			for (var i = 0; i < list.Count; i++)
			{
				AddToDict(dict, list[i].UsedByMap.Values.ToArray());
			}

			Selection.objects = dict.Values.ToArray();
		}


		//-------------------------- UTILS ---------------------

		internal static void AddToDict(Dictionary<string, Object> dict, params FR2_Asset[] list)
		{
			for (var j = 0; j < list.Length; j++)
			{
				string guid = list[j].guid;
				if (!dict.ContainsKey(guid))
				{
					string assetPath = AssetDatabase.GUIDToAssetPath(guid);
					dict.Add(guid, FR2_Unity.LoadAssetAtPath<Object>(assetPath));
				}
			}
		}

		private static List<Object> GetSelectionDependencies()
		{
			if (!FR2_Cache.isReady)
			{
				Debug.LogWarning("FR2 cache not yet ready, please open Window > FR2_Window and hit scan project!");
				return null;
			}

			return FR2_Cache.FindUsage(FR2_Unity.Selection_AssetGUIDs).Select(
				guid =>
				{
					string assetPath = AssetDatabase.GUIDToAssetPath(guid);
					return FR2_Unity.LoadAssetAtPath<Object>(assetPath);
				}
			).ToList();
		}

		private class ProcessReplaceData
		{
			public readonly List<ReplaceData> datas = new List<ReplaceData>();
			public int processIndex;
		}

		private class ReplaceData
		{
			public FR2_Asset asset;
			public string from;
			public bool isSucess;
			public bool isTerrian;
			public bool isUpdated;
			public TerrainData terrainData;
			public string to;

            public long toFileId;
		}

		//	AssetDatabase.ImportAsset(oAssetPath, ImportAssetOptions.Default);
		//	importer.importMaterials = false;
		//	var importer = AssetImporter.GetAtPath(oAssetPath) as ModelImporter;
		//	var nModel = AssetDatabase.LoadAssetAtPath<GameObject>(oAssetPath);

		//	// Reimport model with importMaterial = false
		//	var extension = Path.GetExtension(oAssetPath);

		//	model_materials = model.GetComponent<Renderer>().sharedMaterials;
		//	var oGUID = AssetDatabase.AssetPathToGUID(oAssetPath);

		//	var oAssetPath = AssetDatabase.GetAssetPath(model);
		//	if (model == null) return;
		//{
		//static void CreatePrefabReplaceModel(GameObject model)

		//static Material[] model_materials;

		//	//create prefab from new model
		//	var prefabPath = oAssetPath.Replace(extension, ".prefab");
		//	var clone = (GameObject)Object.Instantiate(nModel);
		//	clone.GetComponent<Renderer>().sharedMaterials = model_materials;
		//	PrefabUtility.CreatePrefab(prefabPath, clone, ReplacePrefabOptions.ReplaceNameBased);
		//	AssetDatabase.SaveAssets();
		//	GameObject.DestroyImmediate(clone);
		//}
	}
}