using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEditor;
using UnityEngine;
using UnityObject = UnityEngine.Object;

namespace vietlabs.fr2
{
	public class FR2_Bookmark : IRefDraw
	{	
		internal static HashSet<string> guidSet = new HashSet<string>();
		internal static HashSet<string> instSet = new HashSet<string>(); // Do not reference directly to SceneObject (which might be destroyed anytime)
		
		public static int Count
		{
			get { return guidSet.Count + instSet.Count; }
		}

		public static bool Contains(string guidOrInstID)
		{
			return guidSet.Contains(guidOrInstID) || instSet.Contains(guidOrInstID);
		}

		public static bool Contains(UnityObject sceneObject)
		{
			var id = sceneObject.GetInstanceID().ToString();
			return instSet.Contains(id);
		}
        public static bool Contains(FR2_Ref rf)
        {
            if (rf.isSceneRef)
            {
                if (instSet == null) return false;
                return instSet.Contains(rf.component.GetInstanceID().ToString());
            }
            else
            {
                if (guidSet == null) return false;
                return guidSet.Contains(rf.asset.guid);
            }
        }
        public static void Add(UnityObject sceneObject)
		{
			if (sceneObject == null) return;
			var id = sceneObject.GetInstanceID().ToString();
			instSet.Add(id); // hashset does not need to check exist before add
			dirty = true;
		}

		public static void Add(string guid)
		{
			if (guidSet.Contains(guid)) return;
			var assetPath = AssetDatabase.GUIDToAssetPath(guid);
			if (string.IsNullOrEmpty(assetPath))
			{
				Debug.LogWarning("Invalid GUID: " + guid);
				return;
			}

			guidSet.Add(guid);
			dirty = true;
			//Debug.Log(instSet.Count + " : " + guidSet.Count);
		}

		public static void Remove(UnityObject sceneObject)
		{
			if (sceneObject == null) return;
			var id = sceneObject.GetInstanceID().ToString();
			instSet.Remove(id); 
			dirty = true;
		}

		public static void Remove(string guidOrInstID)
		{
			guidSet.Remove(guidOrInstID);
			instSet.Remove(guidOrInstID);
			dirty = true;
		}
		
		public static void Clear()
		{
			guidSet.Clear();
			instSet.Clear();
			dirty = true;
		}

		public static void Add(FR2_Ref rf)
		{
            
			if (rf.isSceneRef)
			{
                //Debug.Log("add " + rf.component);
                Add(rf.component);
			}
			else
			{
				Add(rf.asset.guid);
			}
		}

		public static void Remove(FR2_Ref rf)
		{
            
			if (rf.isSceneRef)
			{
                //Debug.Log("remove: " + rf.component);
                Remove(rf.component);
			}
			else
			{
				Remove(rf.asset.guid);
			}
		}
		
		public static void Commit()
		{
			var list = new List<Object>();

			foreach (string guid in guidSet)
			{
				string path = AssetDatabase.GUIDToAssetPath(guid);
				Object obj = AssetDatabase.LoadAssetAtPath(path, typeof(Object));
				if (obj != null) list.Add(obj);
			}

			foreach (string instID in instSet)
			{
				var id = int.Parse(instID);
				var obj = EditorUtility.InstanceIDToObject(id);
				if (obj != null) list.Add(obj);
			}

			Selection.objects = list.ToArray();
		}
		
		// ------------ instance

		//private readonly FR2_TreeUI2.GroupDrawer groupDrawer;
		private static bool dirty;
		private readonly FR2_RefDrawer drawer;
		internal Dictionary<string, FR2_Ref> refs = new Dictionary<string, FR2_Ref>();

		public FR2_Bookmark(IWindow window)
		{
			this.window = window;
			drawer = new FR2_RefDrawer(window);
            drawer.messageNoRefs = "Do bookmark something!";

            drawer.groupDrawer.hideGroupIfPossible = true;
			drawer.forceHideDetails = true;
			drawer.level0Group = string.Empty;
			
			dirty = true;
			drawer.SetDirty();
		}

		public IWindow window { get; set; }
		
		public int ElementCount()
		{
			return refs == null ? 0 : refs.Count;
		}

		public bool DrawLayout()
		{
			if (dirty) RefreshView();
			return drawer.DrawLayout();
		}
		
		public bool Draw(Rect rect)
		{
			if (dirty) RefreshView();
			if (refs == null)
			{
				Debug.Log("Refs is null!");
				return false;
			}
			
			var bottomRect = new Rect(rect.x+1f, rect.yMax - 16f, rect.width-2f, 16f);
			DrawButtons(bottomRect);

			rect.yMax -= 16f;
			return drawer.Draw(rect);
		}

		public void SetDirty()
		{
			drawer.SetDirty();
		}

		void DrawButtons(Rect rect)
		{
			if (Count == 0) return;

			GUILayout.BeginArea(rect);
			{
				GUILayout.BeginHorizontal();
				{
					if (GUILayout.Button("Select"))
					{
						Commit();
						window.WillRepaint = true;
					}
				
					if (GUILayout.Button("Clear"))
					{
						Clear();
						window.WillRepaint = true;
					}
				
					if (GUILayout.Button("CSV"))
					{
						FR2_Export.ExportCSV(refs.Values.ToArray());
					}
				
					if (GUILayout.Button("Delete"))
					{
                        FR2_Unity.BackupAndDeleteAssets(refs.Values.ToArray());
                        Clear();
                        GUIUtility.ExitGUI();
					}
				}
				GUILayout.EndHorizontal();
			}
			GUILayout.EndArea();
		}

		public void RefreshView()
		{
			if (refs == null) refs = new Dictionary<string, FR2_Ref>();
			refs.Clear();

			foreach (var guid in guidSet)
			{
				var asset = FR2_Cache.Api.Get(guid, false);
				refs.Add(guid, new FR2_Ref(0, 0, asset, null));
			}
			
			foreach (var instId in instSet)
			{
				refs.Add(instId, new FR2_SceneRef(0, EditorUtility.InstanceIDToObject(int.Parse(instId))));
			}

			
			drawer.SetRefs(refs);

			//Debug.Log("RefreshView: " + refs.Count);
			dirty = false;
		}

		internal void RefreshSort()
		{
			drawer.RefreshSort();
		}
	}
}