using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using System.ComponentModel;

using BizHawk.Emulation.Common;
using BizHawk.Emulation.Common.IEmulatorExtensions;

using BizHawk.Client.Common;
using BizHawk.Client.Common.MovieConversionExtensions;

using BizHawk.Client.EmuHawk.WinFormExtensions;
using BizHawk.Client.EmuHawk.ToolExtensions;

namespace BizHawk.Client.EmuHawk
{
	public partial class TAStudio : ToolFormBase, IToolFormAutoConfig, IControlMainform
	{
		// TODO: UI flow that conveniently allows to start from savestate
		public TasMovie CurrentTasMovie => Global.MovieSession.Movie as TasMovie;
		private MainForm Mainform => GlobalWin.MainForm;

		public bool IsInMenuLoop { get; private set; }
		public string StatesPath => PathManager.MakeAbsolutePath(Global.Config.PathEntries["Global", "TAStudio states"].Path, null);

		private readonly List<TasClipboardEntry> _tasClipboard = new List<TasClipboardEntry>();
		private const string CursorColumnName = "CursorColumn";
		private const string FrameColumnName = "FrameColumn";
		private BackgroundWorker _seekBackgroundWorker;
		private MovieEndAction _originalEndAction; // The movie end behavior selected by the user (that is overridden by TAStudio)
		private UndoHistoryForm _undoForm;
		private Timer _autosaveTimer;

		private readonly int _defaultMainSplitDistance;
		private readonly int _defaultBranchMarkerSplitDistance;

		/// <summary>
		/// Gets a value that separates "restore last position" logic from seeking caused by navigation.
		/// TASEditor never kills LastPositionFrame, and it only pauses on it, if it hasn't been greenzoned beforehand and middle mouse button was pressed.
		/// </summary>
		public int LastPositionFrame { get; private set; }

		private Dictionary<string, string> GenerateColumnNames()
		{
			var lg = Global.MovieSession.LogGeneratorInstance();
			lg.SetSource(Global.MovieSession.MovieControllerAdapter);
			return ((Bk2LogEntryGenerator)lg).Map();
		}

		[ConfigPersist]
		public TAStudioSettings Settings { get; set; }

		[ConfigPersist]
		public Font TasViewFont { get; set; } = new Font("Arial", 8.25F, FontStyle.Bold, GraphicsUnit.Point, 0);

		public class TAStudioSettings
		{
			public TAStudioSettings()
			{
				RecentTas = new RecentFiles(8);
				DrawInput = true;
				AutoPause = true;
				FollowCursor = true;
				ScrollSpeed = 6;
				FollowCursorAlwaysScroll = false;
				FollowCursorScrollMethod = "near";
				BranchCellHoverInterval = 1;
				SeekingCutoffInterval = 2;
				AutosaveInterval = 120000;
				AutosaveAsBk2 = false;
				AutosaveAsBackupFile = false;
				BackupPerFileSave = false;
				SingleClickFloatEdit = false;
				OldControlSchemeForBranches = false;
				LoadBranchOnDoubleClick = true;

				// default to taseditor fashion
				DenoteStatesWithIcons = false;
				DenoteStatesWithBGColor = true;
				DenoteMarkersWithIcons = false;
				DenoteMarkersWithBGColor = true;
			}

			public RecentFiles RecentTas { get; set; }
			public bool DrawInput { get; set; }
			public bool AutoPause { get; set; }
			public bool AutoRestoreLastPosition { get; set; }
			public bool FollowCursor { get; set; }
			public bool EmptyMarkers { get; set; }
			public int ScrollSpeed { get; set; }
			public bool FollowCursorAlwaysScroll { get; set; }
			public string FollowCursorScrollMethod { get; set; }
			public int BranchCellHoverInterval { get; set; }
			public int SeekingCutoffInterval { get; set; } // unused, relying on VisibleRows is smarter
			public uint AutosaveInterval { get; set; }
			public bool AutosaveAsBk2 { get; set; }
			public bool AutosaveAsBackupFile { get; set; }
			public bool BackupPerFileSave { get; set; }
			public bool SingleClickFloatEdit { get; set; }
			public bool OldControlSchemeForBranches { get; set; } // branch loading will behave differently depending on the recording mode
			public bool LoadBranchOnDoubleClick { get; set; }
			public bool DenoteStatesWithIcons { get; set; }
			public bool DenoteStatesWithBGColor { get; set; }
			public bool DenoteMarkersWithIcons { get; set; }
			public bool DenoteMarkersWithBGColor { get; set; }
			public int MainVerticalSplitDistance { get; set; }
			public int BranchMarkerSplitDistance { get; set; }
		}

		#region Initializing

		public TAStudio()
		{
			void SetImages()
			{
				RecentSubMenu.Image = Properties.Resources.Recent;
				recentMacrosToolStripMenuItem.Image = Properties.Resources.Recent;
				TASEditorManualOnlineMenuItem.Image = Properties.Resources.Help;
				ForumThreadMenuItem.Image = Properties.Resources.TAStudio;

				Icon = Properties.Resources.TAStudio_MultiSize;
			}

			Settings = new TAStudioSettings();
			InitializeComponent();
			SetImages();
			InitializeSeekWorker();

			_defaultMainSplitDistance = MainVertialSplit.SplitterDistance;
			_defaultBranchMarkerSplitDistance = BranchesMarkersSplit.SplitterDistance;

			// TODO: show this at all times or hide it when saving is done?
			SavingProgressBar.Visible = false;

			WantsToControlStopMovie = true;
			WantsToControlRestartMovie = true;
			TasPlaybackBox.Tastudio = this;
			MarkerControl.Tastudio = this;
			BookMarkControl.Tastudio = this;
			TasView.QueryItemText += TasView_QueryItemText;
			TasView.QueryItemBkColor += TasView_QueryItemBkColor;
			TasView.QueryRowBkColor += TasView_QueryRowBkColor;
			TasView.QueryItemIcon += TasView_QueryItemIcon;
			TasView.QueryFrameLag += TasView_QueryFrameLag;
			TasView.PointedCellChanged += TasView_PointedCellChanged;
			TasView.MultiSelect = true;
			LastPositionFrame = -1;
		}

		public void LoadBranchByIndex(int index)
		{
			BookMarkControl.LoadBranchExternal(index);
		}

		private void AutosaveTimerEventProcessor(object sender, EventArgs e)
		{
			if (CurrentTasMovie == null)
			{
				return;
			}

			if (!CurrentTasMovie.Changes || Settings.AutosaveInterval == 0 
				|| CurrentTasMovie.Filename == DefaultTasProjName())
			{
				return;
			}

			if (Settings.AutosaveAsBackupFile)
			{
				if (Settings.AutosaveAsBk2)
				{
					SaveBk2BackupMenuItem_Click(sender, e);
				}
				else
				{
					SaveBackupMenuItem_Click(sender, e);
				}
			}
			else
			{
				if (Settings.AutosaveAsBk2)
				{
					ToBk2MenuItem_Click(sender, e);
				}
				else
				{
					SaveTas();
				}
			}
		}

		private void InitializeSeekWorker()
		{
			if (_seekBackgroundWorker != null)
			{
				_seekBackgroundWorker.Dispose();
				_seekBackgroundWorker = null; // Idk if this line is even useful.
			}

			_seekBackgroundWorker = new BackgroundWorker
			{
				WorkerReportsProgress = true,
				WorkerSupportsCancellation = true
			};

			_seekBackgroundWorker.DoWork += (s, e) =>
			{
				this.Invoke(() => MessageStatusLabel.Text = "Seeking...");
				this.Invoke(() => SavingProgressBar.Visible = true);
				for (;;)
				{
					if (_seekBackgroundWorker.CancellationPending || !IsHandleCreated || !Mainform.PauseOnFrame.HasValue)
					{
						e.Cancel = true;
						break;
					}

					int diff = Emulator.Frame - _seekStartFrame.Value;
					int unit = Mainform.PauseOnFrame.Value - _seekStartFrame.Value;
					double progress = 0;

					if (diff != 0 && unit != 0)
					{
						progress = (double)100d / unit * diff;
					}

					if (progress < 0)
					{
						progress = 0;
					}

					_seekBackgroundWorker.ReportProgress((int)progress);
					System.Threading.Thread.Sleep(1);
				}
			};

			_seekBackgroundWorker.ProgressChanged += (s, e) =>
			{
				this.Invoke(() => SavingProgressBar.Value = e.ProgressPercentage);
			};

			_seekBackgroundWorker.RunWorkerCompleted += (s, e) =>
			{
				this.Invoke(() => SavingProgressBar.Visible = false);
				this.Invoke(() => MessageStatusLabel.Text = "");
				InitializeSeekWorker(); // Required, or it will error when trying to report progress again.
			};
		}

		private bool _initialized;
		private void Tastudio_Load(object sender, EventArgs e)
		{
			if (!InitializeOnLoad())
			{
				Close();
				DialogResult = DialogResult.Cancel;
				return;
			}

			SetColumnsFromCurrentStickies();

			if (TasView.Rotatable)
			{
				RightClickMenu.Items.AddRange(TasView.GenerateContextMenuItems()
					.ToArray());

				RightClickMenu.Items
					.OfType<ToolStripMenuItem>()
					.First(t => t.Name == "RotateMenuItem")
					.Click += (o, ov) => { CurrentTasMovie.FlagChanges(); };
			}

			TasView.InputPaintingMode = Settings.DrawInput;
			TasView.ScrollSpeed = Settings.ScrollSpeed;
			TasView.AlwaysScroll = Settings.FollowCursorAlwaysScroll;
			TasView.ScrollMethod = Settings.FollowCursorScrollMethod;
			TasView.SeekingCutoffInterval = Settings.SeekingCutoffInterval;
			BookMarkControl.HoverInterval = Settings.BranchCellHoverInterval;

			_autosaveTimer = new Timer(components);
			_autosaveTimer.Tick += AutosaveTimerEventProcessor;
			if (Settings.AutosaveInterval > 0)
			{
				_autosaveTimer.Interval = (int)Settings.AutosaveInterval;
				_autosaveTimer.Start();
			}

			// Remembering Split container logic
			if (Settings.MainVerticalSplitDistance > 0)
			{
				try
				{
					MainVertialSplit.SplitterDistance = Settings.MainVerticalSplitDistance;
				}
				catch (Exception)
				{
					MainVertialSplit.SplitterDistance = _defaultMainSplitDistance;
				}
				
			}

			if (Settings.BranchMarkerSplitDistance > 0)
			{
				try
				{
					BranchesMarkersSplit.SplitterDistance = Settings.BranchMarkerSplitDistance;
				}
				catch (Exception)
				{
					BranchesMarkersSplit.SplitterDistance = _defaultBranchMarkerSplitDistance;
				}
			}

			TasView.Font = TasViewFont;
			RefreshDialog();
			_initialized = true;
		}

		private bool CanAutoload => Settings.RecentTas.AutoLoad && !string.IsNullOrEmpty(Settings.RecentTas.MostRecent);

		private bool InitializeOnLoad()
		{
			Mainform.PauseOnFrame = null;
			Mainform.PauseEmulator();

			// Start Scenario 0: core needs a nag
			// But do not nag if auto-loading
			if (!CanAutoload && !EmuHawkUtil.EnsureCoreIsAccurate(Emulator))
			{
				// Inaccurate core but allow the user to continue anyway
			}

			// Start Scenario 1: A regular movie is active
			if (Global.MovieSession.Movie.IsActive && !(Global.MovieSession.Movie is TasMovie))
			{
				var result = MessageBox.Show("In order to use Tastudio, a new project must be created from the current movie\nThe current movie will be saved and closed, and a new project file will be created\nProceed?", "Convert movie", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
				if (result == DialogResult.OK)
				{
					ConvertCurrentMovieToTasproj();
					StartNewMovieWrapper(false);
					SetUpColumns();
				}
				else
				{
					return false;
				}
			}

			// Start Scenario 2: A tasproj is already active
			else if (Global.MovieSession.Movie.IsActive && Global.MovieSession.Movie is TasMovie)
			{
				bool result = LoadFile(new FileInfo(CurrentTasMovie.Filename), gotoFrame: Emulator.Frame);
				if (!result)
				{
					TasView.AllColumns.Clear();
					StartNewTasMovie();
				}
			}

			// Start Scenario 3: No movie, but user wants to autoload their last project
			else if (CanAutoload)
			{
				bool result = LoadFile(new FileInfo(Settings.RecentTas.MostRecent));
				if (!result)
				{
					TasView.AllColumns.Clear();
					StartNewTasMovie();
				}
			}

			// Start Scenario 4: No movie, default behavior of engaging tastudio with a new default project
			else
			{
				StartNewTasMovie();
			}

			if (Emulator.IsNull())
			{
				DisengageTastudio();
				return false;
			}

			EngageTastudio();
			return true;
		}

		private void SetTasMovieCallbacks(TasMovie movie = null)
		{
			if (movie == null)
			{
				movie = CurrentTasMovie;
			}

			movie.ClientSettingsForSave = ClientSettingsForSave;
			movie.GetClientSettingsOnLoad = GetClientSettingsOnLoad;
		}

		private string ClientSettingsForSave()
		{
			return TasView.UserSettingsSerialized();
		}

		private void GetClientSettingsOnLoad(string settingsJson)
		{
			TasView.LoadSettingsSerialized(settingsJson);
		}

		private void SetUpColumns()
		{
			TasView.AllColumns.Clear();
			AddColumn(CursorColumnName, "", 18);
			AddColumn(
				new RollColumn
				{
					Name = FrameColumnName,
					Text = "Frame#",
					Width = 68,
					Type = ColumnType.Text,
					Rotatable = true
				});

			var columnNames = GenerateColumnNames();
			foreach (var kvp in columnNames)
			{
				ColumnType type;
				int digits;
				if (ControllerType.FloatControls.Contains(kvp.Key))
				{
					ControllerDefinition.FloatRange range = ControllerType.FloatRanges
						[ControllerType.FloatControls.IndexOf(kvp.Key)];
					type = ColumnType.Float;
					digits = Math.Max(kvp.Value.Length, range.MaxDigits());
				}
				else
				{
					type = ColumnType.Boolean;
					digits = kvp.Value.Length;
				}

				AddColumn(kvp.Key, kvp.Value, (digits * 6) + 14, type); // magic numbers reused in EditBranchTextPopUp()
			}

			var columnsToHide = TasView.AllColumns
				.Where(c =>
					// todo: make a proper user editable list?
					c.Name == "Power"
					|| c.Name == "Reset"
					|| c.Name == "Light Sensor"
					|| c.Name == "Open"
					|| c.Name == "Close"
					|| c.Name == "Disc Select"
					|| c.Name.StartsWith("Tilt")
					|| c.Name.StartsWith("Key ")
					|| c.Name.EndsWith("Tape")
					|| c.Name.EndsWith("Disk")
					|| c.Name.EndsWith("Block")
					|| c.Name.EndsWith("Status"));

			foreach (var column in columnsToHide)
			{
				column.Visible = false;
			}

			TasView.AllColumns.ColumnsChanged();

			// Patterns
			int bStart = 0;
			int fStart = 0;
			if (BoolPatterns == null)
			{
				BoolPatterns = new AutoPatternBool[ControllerType.BoolButtons.Count + 2];
				FloatPatterns = new AutoPatternFloat[ControllerType.FloatControls.Count + 2];
			}
			else
			{
				bStart = BoolPatterns.Length - 2;
				fStart = FloatPatterns.Length - 2;
				Array.Resize(ref BoolPatterns, ControllerType.BoolButtons.Count + 2);
				Array.Resize(ref FloatPatterns, ControllerType.FloatControls.Count + 2);
			}

			for (int i = bStart; i < BoolPatterns.Length - 2; i++)
			{
				BoolPatterns[i] = new AutoPatternBool(1, 1);
			}

			BoolPatterns[BoolPatterns.Length - 2] = new AutoPatternBool(1, 0);
			BoolPatterns[BoolPatterns.Length - 1] = new AutoPatternBool(
				Global.Config.AutofireOn, Global.Config.AutofireOff);

			for (int i = fStart; i < FloatPatterns.Length - 2; i++)
			{
				FloatPatterns[i] = new AutoPatternFloat(new[] { 1f });
			}

			FloatPatterns[FloatPatterns.Length - 2] = new AutoPatternFloat(new[] { 1f });
			FloatPatterns[FloatPatterns.Length - 1] = new AutoPatternFloat(
				1f, Global.Config.AutofireOn, 0f, Global.Config.AutofireOff);

			SetUpToolStripColumns();
		}

		public void AddColumn(string columnName, string columnText, int columnWidth, ColumnType columnType = ColumnType.Boolean)
		{
			AddColumn(
				new RollColumn
				{
					Name = columnName,
					Text = columnText,
					Width = columnWidth,
					Type = columnType
				});
		}

		private void AddColumn(RollColumn column)
		{
			if (TasView.AllColumns[column.Name] == null)
				TasView.AllColumns.Add(column);
		}

		private void EngageTastudio()
		{
			GlobalWin.OSD.AddMessage("TAStudio engaged");
			SetTasMovieCallbacks();
			SetTextProperty();
			Mainform.RelinquishControl(this);
			_originalEndAction = Global.Config.MovieEndAction;
			Mainform.ClearRewindData();
			Global.Config.MovieEndAction = MovieEndAction.Record;
			Mainform.SetMainformMovieInfo();
			Global.MovieSession.ReadOnly = true;
			SetSplicer();
		}

		#endregion

		#region Loading

		private void ConvertCurrentMovieToTasproj()
		{
			Global.MovieSession.Movie.Save();
			Global.MovieSession.Movie = Global.MovieSession.Movie.ToTasMovie();
			Global.MovieSession.Movie.Save();
			Global.MovieSession.Movie.SwitchToPlay();
			Settings.RecentTas.Add(Global.MovieSession.Movie.Filename);
		}

		private bool LoadFile(FileInfo file, bool startsFromSavestate = false, int gotoFrame = 0)
		{
			if (!file.Exists)
			{
				Settings.RecentTas.HandleLoadError(file.FullName);
				return false;
			}

			TasMovie newMovie = new TasMovie(startsFromSavestate);
			newMovie.TasStateManager.InvalidateCallback = GreenzoneInvalidated;
			newMovie.Filename = file.FullName;

			BookMarkControl.LoadedCallback = BranchLoaded;
			BookMarkControl.SavedCallback = BranchSaved;
			BookMarkControl.RemovedCallback = BranchRemoved;

			if (!HandleMovieLoadStuff(newMovie))
			{
				return false;
			}

			Settings.RecentTas.Add(newMovie.Filename); // only add if it did load

			if (startsFromSavestate)
			{
				GoToFrame(0);
			}
			else if (gotoFrame > 0)
			{
				GoToFrame(gotoFrame);
			}
			else
			{
				GoToFrame(CurrentTasMovie.Session.CurrentFrame);
			}

			// If we are loading an existing non-default movie, we will already have columns generated
			// Only set up columns if needed
			if (!TasView.AllColumns.Any())
			{
				SetUpColumns();
			}

			SetUpToolStripColumns();

			CurrentTasMovie.PropertyChanged += TasMovie_OnPropertyChanged;
			CurrentTasMovie.CurrentBranch = CurrentTasMovie.Session.CurrentBranch;
			BookMarkControl.UpdateTextColumnWidth();
			MarkerControl.UpdateTextColumnWidth();
			// clear all selections
			TasView.DeselectAll();
			BookMarkControl.Restart();
			MarkerControl.Restart();

			RefreshDialog();
			return true;
		}

		private void StartNewTasMovie()
		{
			if (AskSaveChanges())
			{
				Global.MovieSession.Movie = new TasMovie();
				var stateManager = ((TasMovie)Global.MovieSession.Movie).TasStateManager;
				
				stateManager.InvalidateCallback = GreenzoneInvalidated;

				BookMarkControl.LoadedCallback = BranchLoaded;
				BookMarkControl.SavedCallback = BranchSaved;
				BookMarkControl.RemovedCallback = BranchRemoved;

				CurrentTasMovie.PropertyChanged += TasMovie_OnPropertyChanged;
				CurrentTasMovie.Filename = DefaultTasProjName(); // TODO don't do this, take over any mainform actions that can crash without a filename
				CurrentTasMovie.PopulateWithDefaultHeaderValues();
				SetTasMovieCallbacks();
				CurrentTasMovie.ClearChanges(); // Don't ask to save changes here.

				if (HandleMovieLoadStuff())
				{
					CurrentTasMovie.TasStateManager.Capture(); // Capture frame 0 always.
				}

				// clear all selections
				TasView.DeselectAll();
				BookMarkControl.Restart();
				MarkerControl.Restart();
				SetUpColumns();
				RefreshDialog();
			}
		}

		private bool HandleMovieLoadStuff(TasMovie movie = null)
		{
			bool result;
			WantsToControlStopMovie = false;

			if (movie == null)
			{
				movie = CurrentTasMovie;
				result = StartNewMovieWrapper(movie.InputLogLength == 0, movie);
			}
			else
			{
				result = StartNewMovieWrapper(false, movie);
			}

			if (!result)
			{
				return false;
			}

			WantsToControlStopMovie = true;

			CurrentTasMovie.ChangeLog.ClearLog();
			CurrentTasMovie.ClearChanges();

			SetTextProperty();
			MessageStatusLabel.Text = $"{Path.GetFileName(CurrentTasMovie.Filename)} loaded.";

			return true;
		}

		private bool StartNewMovieWrapper(bool record, IMovie movie = null)
		{
			_initializing = true;

			if (movie == null)
			{
				movie = CurrentTasMovie;
			}
			
			SetTasMovieCallbacks(movie as TasMovie);

			bool result = Mainform.StartNewMovie(movie, record);
			if (result)
			{
				CurrentTasMovie.TasStateManager.Capture(); // Capture frame 0 always.
				BookMarkControl.UpdateTextColumnWidth();
				MarkerControl.UpdateTextColumnWidth();
			}

			TastudioPlayMode();

			_initializing = false;

			return result;
		}

		private void DummyLoadProject(string path)
		{
			if (AskSaveChanges())
			{
				LoadFile(new FileInfo(path));
			}
		}

		private void DummyLoadMacro(string path)
		{
			if (!TasView.AnyRowsSelected)
			{
				return;
			}

			var loadZone = new MovieZone(path)
			{
				Start = TasView.FirstSelectedIndex ?? 0
			};
			loadZone.PlaceZone(CurrentTasMovie);
		}

		private void SetColumnsFromCurrentStickies()
		{
			foreach (var column in TasView.VisibleColumns)
			{
				if (Global.StickyXORAdapter.IsSticky(column.Name))
				{
					column.Emphasis = true;
				}
			}
		}

		#endregion

		private void TastudioPlayMode()
		{
			TasPlaybackBox.RecordingMode = false;
		}

		private void TastudioRecordMode()
		{
			TasPlaybackBox.RecordingMode = true;
		}

		private void TastudioStopMovie()
		{
			Global.MovieSession.StopMovie(false);
			Mainform.SetMainformMovieInfo();
		}

		private void DisengageTastudio()
		{
			Mainform.PauseOnFrame = null;
			GlobalWin.OSD.AddMessage("TAStudio disengaged");
			Global.MovieSession.Movie = MovieService.DefaultInstance;
			Mainform.TakeBackControl();
			Global.Config.MovieEndAction = _originalEndAction;
			Mainform.SetMainformMovieInfo();

			// Do not keep TAStudio's disk save states.
			// if (Directory.Exists(statesPath)) Directory.Delete(statesPath, true);
			// TODO - do we need to dispose something here instead?
		}

		/// <summary>
		/// Used when starting a new project
		/// </summary>
		private static string DefaultTasProjName()
		{
			return Path.Combine(
				PathManager.MakeAbsolutePath(Global.Config.PathEntries.MoviesPathFragment, null),
				$"{TasMovie.DefaultProjectName}.{TasMovie.Extension}");
		}

		/// <summary>
		/// Used for things like SaveFile dialogs to suggest a name to the user
		/// </summary>
		private static string SuggestedTasProjName()
		{
			return Path.Combine(
				PathManager.MakeAbsolutePath(Global.Config.PathEntries.MoviesPathFragment, null),
				$"{PathManager.FilesystemSafeName(Global.Game)}.{TasMovie.Extension}");
		}

		private void SetTextProperty()
		{
			var text = "TAStudio";
			if (CurrentTasMovie != null)
			{
				text += $" - {CurrentTasMovie.Name}{(CurrentTasMovie.Changes ? "*" : "")}";
			}

			if (InvokeRequired)
			{
				this.Invoke(() => Text = text);
			}
			else
			{
				Text = text;
			}
		}

		public IEnumerable<int> GetSelection()
		{
			return TasView.SelectedRows;
		}

		public void RefreshDialog(bool refreshTasView = true, bool refreshBranches = true)
		{
			if (_exiting)
			{
				return;
			}

			if (refreshTasView)
			{
				RefreshTasView();
			}

			MarkerControl?.UpdateValues();

			if (refreshBranches)
			{
				BookMarkControl?.UpdateValues();
			}

			if (_undoForm != null && !_undoForm.IsDisposed)
			{
				_undoForm.UpdateValues();
			}
		}

		private void RefreshTasView()
		{
			TasView.RowCount = CurrentTasMovie.InputLogLength + 1;
			_lastRefresh = Emulator.Frame;
		}

		public void DoAutoRestore()
		{
			if (Settings.AutoRestoreLastPosition && LastPositionFrame != -1)
			{
				if (LastPositionFrame > Emulator.Frame) // Don't unpause if we are already on the desired frame, else runaway seek
				{
					StartSeeking(LastPositionFrame);
				}
			}
			else
			{
				if (_autoRestorePaused.HasValue && !_autoRestorePaused.Value)
				{
					// this happens when we're holding the left button while unpaused - view scrolls down, new input gets drawn, seek pauses
					Mainform.UnpauseEmulator();
				}

				_autoRestorePaused = null;
			}
		}

		private void StartAtNearestFrameAndEmulate(int frame, bool fromLua, bool fromRewinding)
		{
			if (frame == Emulator.Frame)
			{
				return;
			}

			_unpauseAfterSeeking = (fromRewinding || WasRecording) && !Mainform.EmulatorPaused;
			TastudioPlayMode();
			var closestState = CurrentTasMovie.TasStateManager.GetStateClosestToFrame(frame);
			if (closestState.Value.Length > 0 && (frame < Emulator.Frame || closestState.Key > Emulator.Frame))
			{
				LoadState(closestState);
			}

			if (fromLua)
			{
				bool wasPaused = Mainform.EmulatorPaused; 
				
				// why not use this? because I'm not letting the form freely run. it all has to be under this loop.
				// i could use this and then poll StepRunLoop_Core() repeatedly, but.. that's basically what I'm doing
				// PauseOnFrame = frame;
				
				// can't re-enter lua while doing this
				Mainform.SuppressLua = true;
				while (Emulator.Frame != frame)
				{
					Mainform.SeekFrameAdvance();
				}

				Mainform.SuppressLua = false;

				if (!wasPaused)
				{
					Mainform.UnpauseEmulator();
				}

				// lua botting users will want to re-activate record mode automatically -- it should be like nothing ever happened
				if (WasRecording)
				{
					TastudioRecordMode();
				}

				// now the next section won't happen since we're at the right spot
			}

			// frame == Emulator.Frame when frame == 0
			if (frame > Emulator.Frame)
			{
				// make seek frame keep up with emulation on fast scrolls
				if (Mainform.EmulatorPaused || Mainform.IsSeeking || fromRewinding || WasRecording)
				{
					StartSeeking(frame);
				}
				else
				{
					// GUI users may want to be protected from clobbering their video when skipping around...
					// well, users who are rewinding aren't. (that gets done through the seeking system in the call above)
					// users who are clicking around.. I don't know.
				}
			}
		}

		public void LoadState(KeyValuePair<int, byte[]> state)
		{
			using var ms = new MemoryStream(state.Value);
			using var br = new BinaryReader(ms);
			StatableEmulator.LoadStateBinary(br);

			if (state.Key == 0 && CurrentTasMovie.StartsFromSavestate)
			{
				Emulator.ResetCounters();
			}

			_hackyDontUpdate = true;
			GlobalWin.Tools.UpdateBefore();
			GlobalWin.Tools.UpdateAfter();
			_hackyDontUpdate = false;
		}

		public void AddBranchExternal()
		{
			BookMarkControl.AddBranchExternal();
		}

		public void RemoveBranchExternal()
		{
			BookMarkControl.RemoveBranchExternal();
		}

		private void UpdateOtherTools() // a hack probably, surely there is a better way to do this
		{
			_hackyDontUpdate = true;
			GlobalWin.Tools.UpdateBefore();
			GlobalWin.Tools.UpdateAfter();
			_hackyDontUpdate = false;
		}

		public void TogglePause()
		{
			Mainform.TogglePause();
		}

		private void SetSplicer()
		{
			// TODO: columns selected?
			var temp = $"Selected: {TasView.SelectedRows.Count()} {(TasView.SelectedRows.Count() == 1 ? "frame" : "frames")}, States: {CurrentTasMovie.TasStateManager.Count}";
			if (_tasClipboard.Any()) temp += $", Clipboard: {_tasClipboard.Count} {(_tasClipboard.Count == 1 ? "frame" : "frames")}";
			SplicerStatusLabel.Text = temp;
		}

		private void UpdateChangesIndicator()
		{
			// TODO
		}

		private void DoTriggeredAutoRestoreIfNeeded()
		{
			if (_triggerAutoRestore)
			{
				DoAutoRestore();

				_triggerAutoRestore = false;
				_autoRestorePaused = null;
			}
		}

		public void InsertNumFrames(int insertionFrame, int numberOfFrames)
		{
			if (insertionFrame < CurrentTasMovie.InputLogLength)
			{
				bool needsToRollback = TasView.FirstSelectedIndex < Emulator.Frame;

				CurrentTasMovie.InsertEmptyFrame(insertionFrame, numberOfFrames);

				if (needsToRollback)
				{
					GoToLastEmulatedFrameIfNecessary(insertionFrame);
					DoAutoRestore();
				}
				else
				{
					RefreshDialog();
				}
			}
		}

		public void DeleteFrames(int beginningFrame, int numberOfFrames)
		{
			if (beginningFrame < CurrentTasMovie.InputLogLength)
			{
				int[] framesToRemove = Enumerable.Range(beginningFrame, numberOfFrames).ToArray();
				CurrentTasMovie.RemoveFrames(framesToRemove);
				SetSplicer();

				var needsToRollback = beginningFrame < Emulator.Frame;
				if (needsToRollback)
				{
					GoToLastEmulatedFrameIfNecessary(beginningFrame);
					DoAutoRestore();
				}
				else
				{
					RefreshDialog();
				}
			}
		}

		#region Dialog Events

		private void Tastudio_Closing(object sender, FormClosingEventArgs e)
		{
			if (!_initialized)
			{
				return;
			}

			_exiting = true;

			if (AskSaveChanges())
			{
				WantsToControlStopMovie = false;
				TastudioStopMovie();
				DisengageTastudio();
			}
			else
			{
				e.Cancel = true;
				_exiting = false;
			}

			_undoForm?.Close();
		}

		/// <summary>
		/// This method is called every time the Changes property is toggled on a <see cref="TasMovie"/> instance.
		/// </summary>
		private void TasMovie_OnPropertyChanged(object sender, PropertyChangedEventArgs e)
		{
			SetTextProperty();
		}

		private void TAStudio_DragDrop(object sender, DragEventArgs e)
		{
			if (!AskSaveChanges())
			{
				return;
			}

			var filePaths = (string[])e.Data.GetData(DataFormats.FileDrop);
			if (Path.GetExtension(filePaths[0]) == $".{TasMovie.Extension}")
			{
				FileInfo file = new FileInfo(filePaths[0]);
				if (file.Exists)
				{
					LoadFile(file);
				}
			}
		}

		private void TAStudio_MouseLeave(object sender, EventArgs e)
		{
			DoTriggeredAutoRestoreIfNeeded();
		}

		protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
		{
			if (keyData == Keys.Tab
				|| keyData == (Keys.Shift | Keys.Tab)
				|| keyData == Keys.Space)
			{
				return true;
			}

			return base.ProcessCmdKey(ref msg, keyData);
		}

		#endregion

		private bool AutoAdjustInput()
		{
			TasMovieRecord lagLog = CurrentTasMovie[Emulator.Frame - 1]; // Minus one because get frame is +1;
			bool isLag = Emulator.AsInputPollable().IsLagFrame;

			if (lagLog.WasLagged.HasValue)
			{
				if (lagLog.WasLagged.Value && !isLag)
				{
					// Deleting this frame requires rewinding a frame.
					CurrentTasMovie.ChangeLog.AddInputBind(Emulator.Frame - 1, true, $"Bind Input; Delete {Emulator.Frame - 1}");
					bool wasRecording = CurrentTasMovie.ChangeLog.IsRecording;
					CurrentTasMovie.ChangeLog.IsRecording = false;

					CurrentTasMovie.RemoveFrame(Emulator.Frame - 1);
					CurrentTasMovie.RemoveLagHistory(Emulator.Frame); // Removes from WasLag

					CurrentTasMovie.ChangeLog.IsRecording = wasRecording;
					GoToFrame(Emulator.Frame - 1);
					return true;
				}
				else if (!lagLog.WasLagged.Value && isLag)
				{ // (it shouldn't need to rewind, since the inserted input wasn't polled)
					CurrentTasMovie.ChangeLog.AddInputBind(Emulator.Frame - 1, false, $"Bind Input; Insert {Emulator.Frame - 1}");
					bool wasRecording = CurrentTasMovie.ChangeLog.IsRecording;
					CurrentTasMovie.ChangeLog.IsRecording = false;

					CurrentTasMovie.InsertInput(Emulator.Frame - 1, CurrentTasMovie.GetInputLogEntry(Emulator.Frame - 2));
					CurrentTasMovie.InsertLagHistory(Emulator.Frame, true);

					CurrentTasMovie.ChangeLog.IsRecording = wasRecording;
					return true;
				}
			}

			return false;
		}

		private void MainVerticalSplit_SplitterMoved(object sender, SplitterEventArgs e)
		{
			Settings.MainVerticalSplitDistance = MainVertialSplit.SplitterDistance;
		}

		private void BranchesMarkersSplit_SplitterMoved(object sender, SplitterEventArgs e)
		{
			Settings.BranchMarkerSplitDistance = BranchesMarkersSplit.SplitterDistance;
		}

		private void TasView_CellDropped(object sender, InputRoll.CellEventArgs e)
		{
			if (e.NewCell?.RowIndex != null && !CurrentTasMovie.Markers.IsMarker(e.NewCell.RowIndex.Value))
			{
				var currentMarker = CurrentTasMovie.Markers.Single(m => m.Frame == e.OldCell.RowIndex.Value);
				int newFrame = e.NewCell.RowIndex.Value;
				var newMarker = new TasMovieMarker(newFrame, currentMarker.Message);
				CurrentTasMovie.Markers.Remove(currentMarker);
				CurrentTasMovie.Markers.Add(newMarker);
				RefreshDialog();
			}
		}

		private void NewFromSubMenu_DropDownOpened(object sender, EventArgs e)
		{
			NewFromNowMenuItem.Enabled =
				CurrentTasMovie.InputLogLength > 0
				&& !CurrentTasMovie.StartsFromSaveRam;

			NewFromCurrentSaveRamMenuItem.Enabled =
				CurrentTasMovie.InputLogLength > 0
				&& SaveRamEmulator != null;
		}

		private void TASMenu_MenuActivate(object sender, EventArgs e)
		{
			IsInMenuLoop = true;
		}

		private void TASMenu_MenuDeactivate(object sender, EventArgs e)
		{
			IsInMenuLoop = false;
		}

		// Stupid designer
		protected void DragEnterWrapper(object sender, DragEventArgs e)
		{
			GenericDragEnter(sender, e);
		}

		private void SetFontMenuItem_Click(object sender, EventArgs e)
		{
			using var fontDialog = new FontDialog
			{
				ShowColor = false,
				Font = TasView.Font
			};
			var result = fontDialog.ShowDialog();
			if (result != DialogResult.Cancel)
			{
				TasView.Font = TasViewFont = fontDialog.Font;
				TasView.Refresh();
			}
		}
	}
}