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

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

namespace BizHawk.Client.EmuHawk
{
	public partial class TAStudio : Form, IToolForm
	{
		// TODO: UI flow that conveniently allows to start from savestate
		private const string MarkerColumnName = "MarkerColumn";
		private const string FrameColumnName = "FrameColumn";

		private readonly MarkerList _markers = new MarkerList();
		private readonly List<TasClipboardEntry> _tasClipboard = new List<TasClipboardEntry>();

		private int _defaultWidth;
		private int _defaultHeight;
		private TasMovie _tas;

		// Input Painting
		private string _startDrawColumn = string.Empty;
		//private bool _startOn;
		private bool _startMarkerDrag;
		private bool _startFrameDrag;

		private Dictionary<string, string> _map = null;
		private Dictionary<string, string> ColumnNames
		{
			get
			{
				if (_map == null)
				{
					var lg = new Bk2LogEntryGenerator(string.Empty);
					lg.SetSource(Global.MovieSession.MovieControllerAdapter);
					_map = lg.Map();
				}

				return _map;
			}
		}

		public TAStudio()
		{
			InitializeComponent();
			TasView.QueryItemText += TasView_QueryItemText;
			TasView.QueryItemBkColor += TasView_QueryItemBkColor;
			TasView.VirtualMode = true;
			Closing += (o, e) =>
			{
				if (AskSave())
				{
					SaveConfigSettings();
					GlobalWin.OSD.AddMessage("TAStudio Disengaged");
					if (Global.MovieSession.Movie is TasMovie)
					{
						GlobalWin.MainForm.StopMovie(saveChanges: false);
					}
				}
				else
				{
					e.Cancel = true;
				}
			};

			TopMost = Global.Config.TAStudioSettings.TopMost;
			TasView.InputPaintingMode = Global.Config.TAStudioDrawInput;
			TasView.PointedCellChanged += TasView_PointedCellChanged;
		}

		#region IToolForm implementation

		public bool AskSave()
		{
			if (_tas.Changes)
			{
				GlobalWin.Sound.StopSound();
				var result = MessageBox.Show("Save Changes?", "Tastudio", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question, MessageBoxDefaultButton.Button3);
				GlobalWin.Sound.StartSound();
				if (result == DialogResult.Yes)
				{
					SaveTasMenuItem_Click(null, null);
				}
				else if (result == DialogResult.No)
				{
					return true;
				}
				else if (result == DialogResult.Cancel)
				{
					return false;
				}
			}

			return true;
		}

		public bool UpdateBefore
		{
			get { return false; }
		}

		public void UpdateValues()
		{
			if (!IsHandleCreated || IsDisposed)
			{
				return;
			}

			TasView.ItemCount = _tas.InputLogLength;
			if (_tas.IsRecording)
			{
				TasView.ensureVisible(_tas.InputLogLength - 1);
			}
			else
			{
				TasView.ensureVisible(Global.Emulator.Frame - 1);
			}
		}

		public void Restart()
		{
			if (!IsHandleCreated || IsDisposed)
			{
				return;
			}
		}

		#endregion

		private void TasView_QueryItemBkColor(int index, int column, ref Color color)
		{
			var record = _tas[index];
			if (_markers.CurrentFrame == index + 1)
			{
				color = Color.LightBlue;
			}
			else if (!record.HasState)
			{
				color = BackColor;
			}
			else
			{
				color = record.Lagged ? Color.Pink : Color.LightGreen;
			}
		}

		private void TasView_QueryItemText(int index, int column, out string text)
		{
			try
			{
				var columnName = TasView.Columns[column].Name;
				//var columnText = TasView.Columns[column].Text;

				if (columnName == MarkerColumnName)
				{
					text = _markers.CurrentFrame == index + 1 ? ">" : string.Empty;
				}
				else if (columnName == FrameColumnName)
				{
					text = (index + 1).ToString().PadLeft(5, '0');
				}
				else
				{
					//Serialize TODO
					//text = _tas[index].IsPressed(columnName) ? columnText : string.Empty;
					text = string.Empty;
				}
			}
			catch (Exception ex)
			{
				text = string.Empty;
				MessageBox.Show("oops\n" + ex);
			}
		}

		private void Tastudio_Load(object sender, EventArgs e)
		{
			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)
				{
					Global.MovieSession.Movie.Save();
					var newMovie = Global.MovieSession.Movie.ToTasMovie();
					Global.MovieSession.Movie.Stop();
					EngageTasStudio(newMovie);
				}
				else
				{
					Close();
					return;
				}
			}
			else if (Global.MovieSession.Movie.IsActive && Global.MovieSession.Movie is TasMovie)
			{
				_tas = Global.MovieSession.Movie as TasMovie;
			}
			else if (Global.Config.AutoloadTAStudioProject)
			{
				Global.MovieSession.Movie = new TasMovie();
				_tas = Global.MovieSession.Movie as TasMovie;
				LoadFileFromRecent(Global.Config.RecentTas[0]);
			}
			else
			{
				EngageTasStudio();
			}

			SetUpColumns();
			//LoadConfigSettings();
		}

		private void EngageTasStudio(TasMovie newMovie = null)
		{
			GlobalWin.OSD.AddMessage("TAStudio engaged");
			Global.MovieSession.Movie = newMovie ?? new TasMovie();
			
			_tas = Global.MovieSession.Movie as TasMovie;
			_tas.StartNewRecording();
			GlobalWin.MainForm.StartNewMovie(_tas, true, true);
		}

		private void StartNewSession()
		{
			if (AskSave())
			{
				GlobalWin.OSD.AddMessage("new TAStudio session started");
				_tas.StartNewRecording();
				GlobalWin.MainForm.StartNewMovie(_tas, true, true);
				TasView.ItemCount = _tas.InputLogLength;
			}
		}

		private void SetUpColumns()
		{
			TasView.Columns.Clear();
			AddColumn(MarkerColumnName, string.Empty, 18);
			AddColumn(FrameColumnName, "Frame#", 68);

			foreach (var kvp in ColumnNames)
			{
				AddColumn(kvp.Key, kvp.Value, 20 * kvp.Value.Length);
			}
		}

		public void AddColumn(string columnName, string columnText, int columnWidth)
		{
			if (TasView.Columns[columnName] == null)
			{
				var column = new ColumnHeader
				{
					Name = columnName,
					Text = columnText,
					Width = columnWidth,
				};

				TasView.Columns.Add(column);
			}
		}

		private void LoadConfigSettings()
		{
			_defaultWidth = Size.Width;
			_defaultHeight = Size.Height;

			if (Global.Config.TAStudioSettings.UseWindowPosition)
			{
				Location = Global.Config.TAStudioSettings.WindowPosition;
			}

			if (Global.Config.TAStudioSettings.UseWindowSize)
			{
				Size = Global.Config.TAStudioSettings.WindowSize;
			}
		}

		private void SaveConfigSettings()
		{
			Global.Config.TAStudioSettings.Wndx = Location.X;
			Global.Config.TAStudioSettings.Wndy = Location.Y;
			Global.Config.TAStudioSettings.Width = Right - Left;
			Global.Config.TAStudioSettings.Height = Bottom - Top;
		}

		public void LoadFileFromRecent(string path)
		{
			if (AskSave())
			{
				_tas.Filename = path;
				var loadResult = _tas.Load(); // TODO: Global.MovieSession.MovieLoad() needs to be called in order to set up the Movie adapter properly
				if (!loadResult)
				{
					ToolHelpers.HandleLoadError(Global.Config.RecentTas, path);
				}
				else
				{
					Global.Config.RecentTas.Add(path);
					TasView.ItemCount = _tas.InputLogLength;
				}
			}
		}

		private void GoToFrame(int frame)
		{
			// If past greenzone, emulate and capture states
			// If past greenzone AND movie, record input and capture states
			// If in greenzone, loadstate
			// If near a greenzone item, load and emulate
			// Do capturing and recording as needed
			if (_tas[frame - 1].HasState) // Go back 1 frame and emulate
			{
				_tas.SwitchToPlay();
				Global.Emulator.LoadStateBinary(new BinaryReader(new MemoryStream(_tas[frame].State.ToArray())));
				Global.Emulator.FrameAdvance(true);
				GlobalWin.DisplayManager.NeedsToPaint = true;
				TasView.ensureVisible(frame);
				TasView.Refresh();
			}
			else
			{
				// Find the earliest frame before this state
			}
		}

		private void SetSplicer()
		{
			// TODO: columns selected
			// TODO: clipboard
			var list = TasView.SelectedIndices;
			string message;

			if (list.Count > 0)
			{
				message = list.Count + " rows, 0 col, clipboard: ";
			}
			else
			{
				message = list.Count + " selected: none, clipboard: ";
			}

			message += _tasClipboard.Any() ? _tasClipboard.Count.ToString() : "empty";

			SplicerStatusLabel.Text = message;
		}

		private void RefreshFloatingWindowControl()
		{
			Owner = Global.Config.TAStudioSettings.FloatingWindow ? null : GlobalWin.MainForm;
		}

		#region Events

		#region File Menu

		private void FileSubMenu_DropDownOpened(object sender, EventArgs e)
		{
			ToBk2MenuItem.Enabled = 
				SaveTASMenuItem.Enabled =
				!string.IsNullOrWhiteSpace(_tas.Filename);
		}

		private void RecentSubMenu_DropDownOpened(object sender, EventArgs e)
		{
			RecentSubMenu.DropDownItems.Clear();
			RecentSubMenu.DropDownItems.AddRange(
				ToolHelpers.GenerateRecentMenu(Global.Config.RecentTas, LoadFileFromRecent)
			);
		}

		private void NewTasMenuItem_Click(object sender, EventArgs e)
		{
			StartNewSession();
		}

		private void OpenTasMenuItem_Click(object sender, EventArgs e)
		{
			if (AskSave())
			{
				var file = ToolHelpers.GetTasProjFileFromUser(_tas.Filename);
				if (file != null)
				{
					_tas.Filename = file.FullName;
					_tas.Load();
					Global.Config.RecentTas.Add(_tas.Filename);
					TasView.ItemCount = _tas.InputLogLength;
					MessageStatusLabel.Text = Path.GetFileName(_tas.Filename) + " loaded.";
				}
			}
		}

		private void SaveTasMenuItem_Click(object sender, EventArgs e)
		{
			if (string.IsNullOrEmpty(_tas.Filename))
			{
				SaveAsTasMenuItem_Click(sender, e);
			}
			else
			{
				_tas.Save();
				MessageStatusLabel.Text = Path.GetFileName(_tas.Filename) + " saved.";
			}
		}

		private void SaveAsTasMenuItem_Click(object sender, EventArgs e)
		{
			var file = ToolHelpers.GetTasProjSaveFileFromUser(_tas.Filename);
			if (file != null)
			{
				_tas.Filename = file.FullName;
				_tas.Save();
				Global.Config.RecentTas.Add(_tas.Filename);
				MessageStatusLabel.Text = Path.GetFileName(_tas.Filename) + " saved.";
			}
		}

		private void ToBk2MenuItem_Click(object sender, EventArgs e)
		{
			var bk2 = _tas.ToBk2();
			bk2.Save();
			MessageStatusLabel.Text = Path.GetFileName(bk2.Filename) + " created.";
			
		}

		private void ExitMenuItem_Click(object sender, EventArgs e)
		{
			Close();
		}

		#endregion

		#region Config

		private void ConfigSubMenu_DropDownOpened(object sender, EventArgs e)
		{
			DrawInputByDraggingMenuItem.Checked = Global.Config.TAStudioDrawInput;
		}

		private void DrawInputByDraggingMenuItem_Click(object sender, EventArgs e)
		{
			TasView.InputPaintingMode = Global.Config.TAStudioDrawInput ^= true;
		}

		private void CopyMenuItem_Click(object sender, EventArgs e)
		{
			_tasClipboard.Clear();
			var list = TasView.SelectedIndices;
			for (var i = 0; i < list.Count; i++)
			{
				//Serialize TODO
				//_tasClipboard.Add(new TasClipboardEntry(list[i], _tas[i].Buttons));
			}

			SetSplicer();
		}

		#endregion

		#region Settings Menu

		private void SettingsSubMenu_DropDownOpened(object sender, EventArgs e)
		{
			SaveWindowPositionMenuItem.Checked = Global.Config.TAStudioSettings.SaveWindowPosition;
			AutoloadMenuItem.Checked = Global.Config.AutoloadTAStudio;
			AutoloadProjectMenuItem.Checked = Global.Config.AutoloadTAStudioProject;
			AlwaysOnTopMenuItem.Checked = Global.Config.TAStudioSettings.TopMost;
			FloatingWindowMenuItem.Checked = Global.Config.TAStudioSettings.FloatingWindow;
		}

		private void AutoloadMenuItem_Click(object sender, EventArgs e)
		{
			Global.Config.AutoloadTAStudio ^= true;
		}

		private void AutoloadProjectMenuItem_Click(object sender, EventArgs e)
		{
			Global.Config.AutoloadTAStudioProject ^= true;
		}

		private void SaveWindowPositionMenuItem_Click(object sender, EventArgs e)
		{
			Global.Config.TAStudioSettings.SaveWindowPosition ^= true;
		}

		private void AlwaysOnTopMenuItem_Click(object sender, EventArgs e)
		{
			Global.Config.TAStudioSettings.TopMost ^= true;
		}

		private void FloatingWindowMenuItem_Click(object sender, EventArgs e)
		{
			Global.Config.TAStudioSettings.FloatingWindow ^= true;
			RefreshFloatingWindowControl();
		}

		private void RestoreDefaultSettingsMenuItem_Click(object sender, EventArgs e)
		{
			Size = new Size(_defaultWidth, _defaultHeight);

			Global.Config.TAStudioSettings.SaveWindowPosition = true;
			Global.Config.TAStudioSettings.TopMost = false;
			Global.Config.TAStudioSettings.FloatingWindow = false;

			RefreshFloatingWindowControl();
		}

		#endregion

		#region TASView Events

		private void TasView_MouseDown(object sender, MouseEventArgs e)
		{
			if (TasView.PointedCell.Row.HasValue && !string.IsNullOrEmpty(TasView.PointedCell.Column))
			{
				if (TasView.PointedCell.Column == MarkerColumnName)
				{
					_startMarkerDrag = true;
				}
				else if (TasView.PointedCell.Column == FrameColumnName)
				{
					_startFrameDrag = true;
				}
				else
				{
					//_tas.ToggleButton(TasView.PointedCell.Row.Value, TasView.PointedCell.Column);
					TasView.Refresh();

					_startDrawColumn = TasView.PointedCell.Column;
					//_startOn = _tas.IsPressed(TasView.PointedCell.Row.Value, TasView.PointedCell.Column);
				}
			}
		}

		private void TasView_MouseUp(object sender, MouseEventArgs e)
		{
			_startMarkerDrag = false;
			_startFrameDrag = false;
			_startDrawColumn = string.Empty;
		}

		private void TasView_PointedCellChanged(object sender, TasListView.CellEventArgs e)
		{
			if (_startMarkerDrag)
			{
				if (e.NewCell.Row.HasValue)
				{
					GoToFrame(e.NewCell.Row.Value);
				}
			}
			else if (_startFrameDrag)
			{
				if (e.OldCell.Row.HasValue && e.NewCell.Row.HasValue)
				{
					int startVal, endVal;
					if (e.OldCell.Row.Value < e.NewCell.Row.Value)
					{
						startVal = e.OldCell.Row.Value;
						endVal = e.NewCell.Row.Value;
					}
					else
					{
						startVal = e.NewCell.Row.Value;
						endVal = e.OldCell.Row.Value;
					}

					for (var i = startVal + 1; i <= endVal; i++)
					{
						TasView.SelectItem(i, true);
					}
				}
			}
			else if (TasView.IsPaintDown && e.NewCell.Row.HasValue && !string.IsNullOrEmpty(_startDrawColumn))
			{
				//_tas.SetBoolButton(e.NewCell.Row.Value, _startDrawColumn, /*_startOn*/ false); // Notice it uses new row, old column, you can only paint across a single column
				TasView.Refresh();
			}
		}

		private void TasView_SelectedIndexChanged(object sender, EventArgs e)
		{
			SetSplicer();
		}

		#endregion

		#region Dialog Events

		protected override void OnShown(EventArgs e)
		{
			RefreshFloatingWindowControl();
			base.OnShown(e);
		}

		#endregion

		#endregion

		#region Classes

		public class TasClipboardEntry
		{
			private readonly Dictionary<string, bool> _buttons;
			private readonly int _frame;

			public TasClipboardEntry(int frame, Dictionary<string, bool> buttons)
			{
				_frame = frame;
				_buttons = buttons;
			}

			public int Frame
			{
				get { return _frame; }
			}

			public Dictionary<string, bool> Buttons
			{
				get { return _buttons; }
			}
		}

		#endregion
	}
}