using System;
using System.Reflection;
using HarmonyLib;

using RobocraftX;
using RobocraftX.Common;
using RobocraftX.FrontEnd;
using RobocraftX.GUI;
using RobocraftX.GUI.MyGamesScreen;
using Svelto.ECS;
using Svelto.ECS.Experimental;
using Techblox.GameSelection;
using TechbloxModdingAPI.Engines;
using TechbloxModdingAPI.Utility;
using GameMode = RobocraftX.Common.GameMode;

namespace TechbloxModdingAPI.App
{
	public class GameMenuEngine : IFactoryEngine
    {
	    public WrappedHandler<MenuEventArgs> EnterMenu;

	    public WrappedHandler<MenuEventArgs> ExitMenu;
		public IEntityFactory Factory { set; private get; }

		public string Name => "TechbloxModdingAPIGameInfoGameEngine";

		public bool isRemovable => false;

		public EntitiesDB entitiesDB { set; private get; }

		public GameMenuEngine()
		{
			MenuEnteredEnginePatch.EnteredExitedMenu = () =>
			{
				if (IsInMenu)
					EnterMenu.Invoke(this, new MenuEventArgs { });
				else
					ExitMenu.Invoke(this, new MenuEventArgs { });
			};
		}

		public void Dispose()
		{
		}

		public void Ready()
		{
			MenuEnteredEnginePatch.IsInMenu = true; // At first it uses ActivateMenu(), then GoToMenu() which is patched
			MenuEnteredEnginePatch.EnteredExitedMenu();
		}

		// game functionality

		public bool IsInMenu => MenuEnteredEnginePatch.IsInMenu;

		public Game[] GetMyGames()
		{
			EntityCollection<MyGameDataEntityStruct> mgsevs = entitiesDB.QueryEntities<MyGameDataEntityStruct>(MyGamesScreenExclusiveGroups.MyGames);
			var mgsevsB = mgsevs.ToBuffer().buffer;
			Game[] games = new Game[mgsevs.count];
			for (int i = 0; i < mgsevs.count; i++)
			{
				Utility.Logging.MetaDebugLog($"Found game named {mgsevsB[i].GameName}");
				games[i] = new Game(mgsevsB[i].ID);
			}
			return games;
		}

        public bool CreateMyGame(EGID id, string path = "", uint thumbnailId = 0, string gameName = "", string creatorName = "", string description = "", long createdDate = 0L)
		{
			EntityInitializer eci = Factory.BuildEntity<MyGameDataEntityDescriptor_DamnItFJWhyDidYouMakeThisInternal>(id);
			eci.Init(new MyGameDataEntityStruct
			{
				SavedGamePath = new ECSString(path),
				ThumbnailId = thumbnailId,
				GameName = new ECSString(gameName),
				CreatorName = new ECSString(creatorName),
				GameDescription = new ECSString(description),
				CreatedDate = createdDate,
			});
			// entitiesDB.PublishEntityChange<MyGameDataEntityStruct>(id); // this will always fail
			return true;
		}

		public uint HighestID()
		{
			EntityCollection<MyGameDataEntityStruct> games = entitiesDB.QueryEntities<MyGameDataEntityStruct>(MyGamesScreenExclusiveGroups.MyGames);
			var gamesB = games.ToBuffer().buffer;
			uint max = 0;
			for (int i = 0; i < games.count; i++)
			{
				if (gamesB[i].ID.entityID > max)
				{
					max = gamesB[i].ID.entityID;
				}
			}
			return max;
		}

        public bool EnterGame(EGID id)
		{
			if (!ExistsGameInfo(id)) return false;
			ref MyGameDataEntityStruct mgdes = ref GetGameInfo(id);
			return EnterGame(mgdes.GameName, mgdes.FileId);
		}

        public bool EnterGame(string gameName, string fileId, bool autoEnterSim = false)
		{
			GameMode.CurrentMode = autoEnterSim ? RCXMode.Play : RCXMode.Build;
			var data = new GameSelectionData
			{
				gameMode = Techblox.GameSelection.GameMode.PlayGame,
				gameType = GameType.MachineEditor,
				saveName = gameName,
				saveType = SaveType.ExistingSave,
				gameID = "GAMEID_Road_Track", //TODO: Expose to the API
				userContentID = fileId
			};
			// the private FullGameCompositionRoot.SwitchToGame() method gets passed to menu items for this reason
			AccessTools.Method(typeof(FullGameCompositionRoot), "SwitchToGame").Invoke(FullGameFields.Instance, new object[]{data});
			return true;
		}

        public bool SetGameName(EGID id, string name)
		{
			if (!ExistsGameInfo(id)) return false;
			GetGameInfo(id).GameName.Set(name);
			GetGameViewInfo(id).MyGamesSlotComponent.GameName = StringUtil.SanitiseString(name);
			return true;
		}

		public bool SetGameDescription(EGID id, string name)
        {
            if (!ExistsGameInfo(id)) return false;
            GetGameInfo(id).GameDescription.Set(name);
			GetGameViewInfo(id).MyGamesSlotComponent.GameDescription = StringUtil.SanitiseString(name);
            return true;
        }

        public bool ExistsGameInfo(EGID id)
		{
			return entitiesDB.Exists<MyGameDataEntityStruct>(id);
		}

		public ref MyGameDataEntityStruct GetGameInfo(EGID id)
		{
			return ref GetComponent<MyGameDataEntityStruct>(id);
		}

        public dynamic GetGameViewInfo(EGID id)
        {
	        dynamic structOptional = AccessTools.Method("TechbloxModdingAPI.Utility.NativeApiExtensions:QueryEntityOptional", new []{typeof(EntitiesDB), typeof(EGID)})
		        .MakeGenericMethod(AccessTools.TypeByName("RobocraftX.GUI.MyGamesScreen.MyGamesSlotEntityViewStruct"))
		        .Invoke(null, new object[] {entitiesDB, new EGID(id.entityID, MyGamesScreenExclusiveGroups.GameSlotGuiEntities)});
	        if (structOptional == null) throw new Exception("Could not get game slot entity");
	        return structOptional ? structOptional : null;
        }

		public ref T GetComponent<T>(EGID id) where T: unmanaged, IEntityComponent
		{
			return ref entitiesDB.QueryEntity<T>(id);
		}
	}

	internal class MyGameDataEntityDescriptor_DamnItFJWhyDidYouMakeThisInternal : GenericEntityDescriptor<MyGameDataEntityStruct> { }
	
	[HarmonyPatch]
	static class MenuEnteredEnginePatch
	{
		internal static bool IsInMenu;
		internal static Action EnteredExitedMenu;
		public static void Postfix()
		{
			IsInMenu = true;
			EnteredExitedMenu();
		}

		public static MethodBase TargetMethod()
		{
			return AccessTools.Method(typeof(FullGameCompositionRoot), "GoToMenu");
		}
	}
	
	[HarmonyPatch]
	static class MenuExitedEnginePatch
	{
		public static void Prefix()
		{
			MenuEnteredEnginePatch.IsInMenu = false;
			MenuEnteredEnginePatch.EnteredExitedMenu();
		}

		public static MethodBase TargetMethod()
		{
			return AccessTools.Method(typeof(FullGameCompositionRoot), "SwitchToGame");
		}
	}

	public struct MenuEventArgs
	{

	}
}