using System.Collections.Generic;

using HarmonyLib;
using RobocraftX;
using RobocraftX.Common;
using RobocraftX.Schedulers;
using RobocraftX.SimulationModeState;
using Svelto.ECS;
using Svelto.Tasks;
using Svelto.Tasks.Lean;
using RobocraftX.Blocks;
using RobocraftX.Common.Loading;
using RobocraftX.Multiplayer;
using RobocraftX.ScreenshotTaker;
using Techblox.Environment.Transition;
using Techblox.GameSelection;

using TechbloxModdingAPI.Blocks;
using TechbloxModdingAPI.Engines;
using TechbloxModdingAPI.Input;
using TechbloxModdingAPI.Players;
using TechbloxModdingAPI.Utility;

namespace TechbloxModdingAPI.App
{
	public class GameGameEngine : IApiEngine, IReactOnAddAndRemove<LoadingActionEntityStruct>
    {
		public WrappedHandler<GameEventArgs> EnterGame;

        public WrappedHandler<GameEventArgs> ExitGame;

		public string Name => "TechbloxModdingAPIGameInfoMenuEngine";

		public bool isRemovable => false;
		
		public EntitiesDB entitiesDB { set; private get; }

		private bool enteredGame;
		private bool loadingFinished;
		private bool playerJoined;

		public void Dispose()
		{
			ExitGame.Invoke(this, new GameEventArgs { GameName = GetGameData().saveName, GamePath = GetGameData().gameID });
			IsInGame = false;
			loadingFinished = false;
			playerJoined = false;
			enteredGame = false;
		}

		public void Ready()
		{
			enteredGame = true;
			Player.Joined += OnPlayerJoined;
		}

		private void OnPlayerJoined(object sender, PlayerEventArgs args)
		{
			if (args.Player.Type != PlayerType.Local) return;
			playerJoined = true;
			Player.Joined -= OnPlayerJoined;
			CheckJoinEvent();
		}

		// game functionality

		public bool IsInGame
		{
			get;
			private set;
		} = false;

		public void ExitCurrentGame(bool async = false)
		{
			if (async)
			{
				ExitCurrentGameAsync().RunOn(ClientLean.EveryFrameStepRunner_TimeRunningAndStopped);
			}
			else
			{
				entitiesDB.QueryEntity<GameSceneEntityStruct>(CommonExclusiveGroups.GameSceneEGID).WantsToQuit = true;
                entitiesDB.PublishEntityChange<GameSceneEntityStruct>(CommonExclusiveGroups.GameSceneEGID);
			}

		}

		public IEnumerator<TaskContract> ExitCurrentGameAsync()
		{
			/*
            while (Lean.EveryFrameStepRunner_RUNS_IN_TIME_STOPPED_AND_RUNNING.isStopping) { yield return Yield.It; }
            AccessTools.Method(typeof(FullGameCompositionRoot), "SwitchToMenu").Invoke(FullGameFields.Instance, new object[0]);*/
			yield return Yield.It;
			entitiesDB.QueryEntity<GameSceneEntityStruct>(CommonExclusiveGroups.GameSceneEGID).WantsToQuit = true;
            entitiesDB.PublishEntityChange<GameSceneEntityStruct>(CommonExclusiveGroups.GameSceneEGID);
		}

        public void SaveCurrentGame()
		{
			ref GameSceneEntityStruct gses = ref entitiesDB.QueryEntity<GameSceneEntityStruct>(CommonExclusiveGroups.GameSceneEGID);
			gses.LoadAfterSaving = false;
			gses.SaveNow = true;
			entitiesDB.PublishEntityChange<GameSceneEntityStruct>(CommonExclusiveGroups.GameSceneEGID);
		}

        public bool IsTimeRunningMode()
		{
			return TimeRunningModeUtil.IsTimeRunningMode(entitiesDB);
		}

        public bool IsTimeStoppedMode()
		{
			return TimeRunningModeUtil.IsTimeStoppedMode(entitiesDB);
		}

        public void ToggleTimeMode()
        {
	        if (TimeRunningModeUtil.IsTimeStoppedMode(entitiesDB))
		        FakeInput.ActionInput(toggleMode: true);
	        else
	        {
		        IEnumerator<TaskContract> ReloadBuildModeTask()
		        {
			        SwitchAnimationUtil.Start(entitiesDB);
			        while (SwitchAnimationUtil.IsFadeOutActive(entitiesDB))
				        yield return (TaskContract)Yield.It;
			        FullGameFields._multiplayerParams.MultiplayerMode = MultiplayerMode.SinglePlayer;
			        AccessTools.Method(typeof(FullGameCompositionRoot), "ReloadGame")
				        .Invoke(FullGameFields.Instance, new object[] { });
		        }

		        ReloadBuildModeTask().RunOn(ClientLean.UIScheduler);
	        }
        }

        public EGID[] GetAllBlocksInGame(BlockIDs filter = BlockIDs.Invalid)
        {
	        var allBlocks = entitiesDB.QueryEntities<BlockTagEntityStruct>();
	        List<EGID> blockEGIDs = new List<EGID>();
	        foreach (var (blocks, _) in allBlocks)
	        {
		        var (buffer, count) = blocks.ToBuffer();
		        for (int i = 0; i < count; i++)
		        {
			        uint dbid;
			        if (filter == BlockIDs.Invalid)
				        dbid = (uint)filter;
			        else
				        dbid = entitiesDB.QueryEntity<DBEntityStruct>(buffer[i].ID).DBID;
			        if (dbid == (ulong)filter)
				        blockEGIDs.Add(buffer[i].ID);
		        }
	        }

	        return blockEGIDs.ToArray();
        }

        public void EnableScreenshotTaker()
		{
			ref var local = ref entitiesDB.QueryEntity<ScreenshotModeEntityStruct>(ScreenshotTakerEgids.ScreenshotTaker);
			if (local.enabled)
				return;
			local.enabled = true;
			entitiesDB.PublishEntityChange<ScreenshotModeEntityStruct>(ScreenshotTakerEgids.ScreenshotTaker);
		}

        public GameSelectionComponent GetGameData()
        {
	        return entitiesDB.QueryEntity<GameSelectionComponent>(GameSelectionConstants.GameSelectionEGID);
        }

        public void Add(ref LoadingActionEntityStruct entityComponent, EGID egid)
        {
        }

        public void Remove(ref LoadingActionEntityStruct entityComponent, EGID egid)
        { // Finished loading
	        if (!enteredGame) return;
	        enteredGame = false;
	        loadingFinished = true;
	        CheckJoinEvent();
        }

        private void CheckJoinEvent()
        {
	        if (!loadingFinished || !playerJoined) return;
	        EnterGame.Invoke(this, new GameEventArgs { GameName = GetGameData().saveName, GamePath = GetGameData().gameID });
	        IsInGame = true;
        }
    }
}