using System;
using System.Threading.Tasks;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;

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

namespace BizHawk.Client.EmuHawk
{
	public partial class PlayMovie : Form
	{
		private readonly PlatformFrameRates PlatformFrameRates = new PlatformFrameRates();

		private List<IMovie> _movieList = new List<IMovie>();
		private bool _sortReverse;
		private string _sortedCol;

		private bool _sortDetailsReverse;
		private string _sortedDetailsCol;

		public PlayMovie()
		{
			InitializeComponent();
			MovieView.QueryItemText += MovieView_QueryItemText;
			MovieView.VirtualMode = true;
			_sortReverse = false;
			_sortedCol = string.Empty;

			_sortDetailsReverse = false;
			_sortedDetailsCol = string.Empty;
		}

		private void PlayMovie_Load(object sender, EventArgs e)
		{
			IncludeSubDirectories.Checked = Global.Config.PlayMovie_IncludeSubdir;
			MatchHashCheckBox.Checked = Global.Config.PlayMovie_MatchHash;
			ScanFiles();
			PreHighlightMovie();
		}

		private void MovieView_QueryItemText(int index, int column, out string text)
		{
			text = string.Empty;
			if (column == 0) // File
			{
				text = Path.GetFileName(_movieList[index].Filename);
			}

			if (column == 1) // System
			{
				text = _movieList[index].SystemID;
			}

			if (column == 2) // Game
			{
				text = _movieList[index].GameName;
			}

			if (column == 3) // Time
			{
				text = PlatformFrameRates.MovieTime(_movieList[index]).ToString(@"hh\:mm\:ss\.fff");
			}
		}

		private void Run()
		{
			var indices = MovieView.SelectedIndices;
			if (indices.Count > 0) // Import file if necessary
			{
				GlobalWin.MainForm.StartNewMovie(_movieList[MovieView.SelectedIndices[0]], false);
			}
		}

		private int? AddMovieToList(string filename, bool force)
		{
			using (var file = new HawkFile(filename))
			{
				if (!file.Exists)
				{
					return null;
				}
				
				var index = IsDuplicateOf(filename);
				if (!index.HasValue)
				{
					//System.Diagnostics.Stopwatch watch = new System.Diagnostics.Stopwatch(); watch.Start();
					var movie = PreLoadMovieFile(file, force);
					if (movie == null)
					{
						return null;
					}
					//watch.Stop(); Console.WriteLine("[{0}] {1}",watch.ElapsedMilliseconds,Path.GetFileName(filename));
					
					lock (_movieList)
					{
						_movieList.Add(movie);
						index = _movieList.Count - 1;
					}

					_sortReverse = false;
					_sortedCol = string.Empty;
				}

				return index;
			}

		}

		private int? IsDuplicateOf(string filename)
		{
			for (var i = 0; i < _movieList.Count; i++)
			{
				if (_movieList[i].Filename == filename)
				{
					return i;
				}
			}

			return null;
		}

		private IMovie PreLoadMovieFile(HawkFile hf, bool force)
		{
			var movie = MovieService.Get(hf.CanonicalFullPath);

			try
			{
				movie.PreLoadHeaderAndLength(hf);

				// Don't do this from browse
				if (movie.Hash == Global.Game.Hash ||
					Global.Config.PlayMovie_MatchHash == false || force)
				{
					return movie;
				}
			}
			catch (Exception ex)
			{
				// TODO: inform the user that a movie failed to parse in some way
				Console.WriteLine(ex.Message);
			}

			return null;
		}

		private void UpdateList()
		{
			MovieView.Refresh();
			MovieCount.Text = _movieList.Count + " movie"
				+ (_movieList.Count != 1 ? "s" : string.Empty);
		}

		private void PreHighlightMovie()
		{
			if (Global.Game == null)
			{
				return;
			}

			var indices = new List<int>();

			// Pull out matching names
			for (var i = 0; i < _movieList.Count; i++)
			{
				if (PathManager.FilesystemSafeName(Global.Game) == _movieList[i].GameName)
				{
					indices.Add(i);
				}
			}

			if (indices.Count == 0)
			{
				return;
			}

			if (indices.Count == 1)
			{
				HighlightMovie(indices[0]);
				return;
			}

			// Prefer tas files
			var tas = new List<int>();
			for (var i = 0; i < indices.Count; i++)
			{
				foreach (var ext in MovieService.MovieExtensions)
				{
					if (Path.GetExtension(_movieList[indices[i]].Filename).ToUpper() == "." + ext)
					{
						tas.Add(i);
					}
				}
			}

			if (tas.Count == 1)
			{
				HighlightMovie(tas[0]);
				return;
			}
			
			if (tas.Count > 1)
			{
				indices = new List<int>(tas);
			}

			// Final tie breaker - Last used file
			var file = new FileInfo(_movieList[indices[0]].Filename);
			var time = file.LastAccessTime;
			var mostRecent = indices.First();
			for (var i = 1; i < indices.Count; i++)
			{
				file = new FileInfo(_movieList[indices[0]].Filename);
				if (file.LastAccessTime > time)
				{
					time = file.LastAccessTime;
					mostRecent = indices[i];
				}
			}

			HighlightMovie(mostRecent);
			return;
		}

		private void HighlightMovie(int index)
		{
			MovieView.SelectedIndices.Clear();
			MovieView.setSelection(index);
			MovieView.SelectItem(index, true);
		}

		private void ScanFiles()
		{
			_movieList.Clear();
			MovieView.ItemCount = 0;
			MovieView.Update();

			var directory = PathManager.MakeAbsolutePath(Global.Config.PathEntries.MoviesPathFragment, null);
			if (!Directory.Exists(directory))
			{
				Directory.CreateDirectory(directory);
			}

			var dpTodo = new Queue<string>();
			var fpTodo = new List<string>();
			dpTodo.Enqueue(directory);
			Dictionary<string, int> ordinals = new Dictionary<string, int>();

			while (dpTodo.Count > 0)
			{
				string dp = dpTodo.Dequeue();
				
				//enqueue subdirectories if appropriate
				if (Global.Config.PlayMovie_IncludeSubdir)
					foreach(var subdir in Directory.GetDirectories(dp))
						dpTodo.Enqueue(subdir);

				//add movies
				fpTodo.AddRange(Directory.GetFiles(dp, "*." + MovieService.DefaultExtension));
				fpTodo.AddRange(Directory.GetFiles(dp, "*." + TasMovie.Extension));
			}

			//in parallel, scan each movie
			Parallel.For(0, fpTodo.Count, (i) =>
			//for(int i=0;i<fpTodo.Count;i++)
			{
				var file = fpTodo[i];
				lock(ordinals) ordinals[file] = i;
				AddMovieToList(file, force: false);
			}
			);

			//sort by the ordinal key to maintain relatively stable results when rescanning
			_movieList.Sort((a, b) => ordinals[a.Filename].CompareTo(ordinals[b.Filename]));

			RefreshMovieList();
		}

		#region Events

		#region Movie List

		void RefreshMovieList()
		{
			MovieView.ItemCount = _movieList.Count;
			UpdateList();
		}

		private void MovieView_DragEnter(object sender, DragEventArgs e)
		{
			e.Effect = e.Data.GetDataPresent(DataFormats.FileDrop) ? DragDropEffects.Copy : DragDropEffects.None;
		}

		private void MovieView_DragDrop(object sender, DragEventArgs e)
		{
			var filePaths = (string[])e.Data.GetData(DataFormats.FileDrop);

			filePaths
				.Where(path => MovieService.MovieExtensions.Contains(Path.GetExtension(path).Replace(".", "")))
				.ToList()
				.ForEach(path => AddMovieToList(path, force: true));

			RefreshMovieList();
		}

		private void MovieView_KeyDown(object sender, KeyEventArgs e)
		{
			if (e.Control && e.KeyCode == Keys.C)
			{
				var indexes = MovieView.SelectedIndices;
				if (indexes.Count > 0)
				{
					var copyStr = new StringBuilder();
					foreach (int index in indexes)
					{
						copyStr
							.Append(_movieList[index].Filename).Append('\t')
							.Append(_movieList[index].SystemID).Append('\t')
							.Append(_movieList[index].GameName).Append('\t')
							.Append(PlatformFrameRates.MovieTime(_movieList[index]).ToString(@"hh\:mm\:ss\.fff"))
							.AppendLine();

						Clipboard.SetDataObject(copyStr.ToString());
					}
				}
			}
		}

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

		private void MovieView_ColumnClick(object sender, ColumnClickEventArgs e)
		{
			var columnName = MovieView.Columns[e.Column].Text;
			if (_sortedCol != columnName)
			{
				_sortReverse = false;
			}

			switch (columnName)
			{
				case "File":
					if (_sortReverse)
					{
						_movieList = _movieList
							.OrderByDescending(x => Path.GetFileName(x.Filename))
							.ThenBy(x => x.SystemID)
							.ThenBy(x => x.GameName)
							.ThenBy(x => x.FrameCount)
							.ToList();
					}
					else
					{
						_movieList = _movieList
							.OrderBy(x => Path.GetFileName(x.Filename))
							.ThenBy(x => x.SystemID)
							.ThenBy(x => x.GameName)
							.ThenBy(x => x.FrameCount)
							.ToList();
					}
					break;
				case "SysID":
					if (_sortReverse)
					{
						_movieList = _movieList
							.OrderByDescending(x => x.SystemID)
							.ThenBy(x => Path.GetFileName(x.Filename))
							.ThenBy(x => x.GameName)
							.ThenBy(x => x.FrameCount)
							.ToList();
					}
					else
					{
						_movieList = _movieList
							.OrderBy(x => x.SystemID)
							.ThenBy(x => Path.GetFileName(x.Filename))
							.ThenBy(x => x.GameName)
							.ThenBy(x => x.FrameCount)
							.ToList();
					}
					break;
				case "Game":
					if (_sortReverse)
					{
						_movieList = _movieList
							.OrderByDescending(x => x.GameName)
							.ThenBy(x => Path.GetFileName(x.Filename))
							.ThenBy(x => x.SystemID)
							.ThenBy(x => x.FrameCount)
							.ToList();
					}
					else
					{
						_movieList = _movieList
							.OrderBy(x => x.GameName)
							.ThenBy(x => Path.GetFileName(x.Filename))
							.ThenBy(x => x.SystemID)
							.ThenBy(x => x.FrameCount)
							.ToList();
					}
					break;
				case "Length (est.)":
					if (_sortReverse)
					{
						_movieList = _movieList
							.OrderByDescending(x => x.FrameCount)
							.ThenBy(x => Path.GetFileName(x.Filename))
							.ThenBy(x => x.SystemID)
							.ThenBy(x => x.FrameCount)
							.ToList();
					}
					else
					{
						_movieList = _movieList
							.OrderBy(x => x.FrameCount)
							.ThenBy(x => Path.GetFileName(x.Filename))
							.ThenBy(x => x.SystemID)
							.ThenBy(x => x.GameName)
							.ToList();
					}
					break;
			}

			_sortedCol = columnName;
			_sortReverse = !_sortReverse;
			MovieView.Refresh();
		}

		private void MovieView_SelectedIndexChanged(object sender, EventArgs e)
		{
			toolTip1.SetToolTip(DetailsView, string.Empty);
			DetailsView.Items.Clear();
			if (MovieView.SelectedIndices.Count < 1)
			{
				OK.Enabled = false;
				return;
			}

			OK.Enabled = true;

			var firstIndex = MovieView.SelectedIndices[0];
			MovieView.ensureVisible(firstIndex);

			foreach (var kvp in _movieList[firstIndex].HeaderEntries)
			{
				var item = new ListViewItem(kvp.Key);
				item.SubItems.Add(kvp.Value);

				bool add = true;

				switch (kvp.Key)
				{
					case HeaderKeys.SHA1:
						if (kvp.Value != Global.Game.Hash)
						{
							item.BackColor = Color.Pink;
							toolTip1.SetToolTip(DetailsView, "Current SHA1: " + Global.Game.Hash);
						}
						break;
					case HeaderKeys.EMULATIONVERSION:
						if (kvp.Value != VersionInfo.GetEmuVersion())
						{
							item.BackColor = Color.Yellow;
						}
						break;
					case HeaderKeys.PLATFORM:
						if (kvp.Value != Global.Game.System)
						{
							item.BackColor = Color.Pink;
						}
						break;
				}

				if(add)
					DetailsView.Items.Add(item);
			}

			var FpsItem = new ListViewItem("Fps");
			FpsItem.SubItems.Add(string.Format("{0:0.#######}", Fps(_movieList[firstIndex])));
			DetailsView.Items.Add(FpsItem);

			var FramesItem = new ListViewItem("Frames");
			FramesItem.SubItems.Add(_movieList[firstIndex].FrameCount.ToString());
			DetailsView.Items.Add(FramesItem);
			CommentsBtn.Enabled = _movieList[firstIndex].Comments.Any();
			SubtitlesBtn.Enabled = _movieList[firstIndex].Subtitles.Any();
		}

		public double Fps(IMovie movie)
		{
			var system = movie.HeaderEntries[HeaderKeys.PLATFORM];
			var pal = movie.HeaderEntries.ContainsKey(HeaderKeys.PAL) &&
					movie.HeaderEntries[HeaderKeys.PAL] == "1";

			return new PlatformFrameRates()[system, pal];
			
		}

		private void EditMenuItem_Click(object sender, EventArgs e)
		{
			MovieView.SelectedIndices
				.Cast<int>()
				.Select(index => _movieList[index])
				.ToList()
				.ForEach(movie => System.Diagnostics.Process.Start(movie.Filename));
		}

		#endregion

		#region Details

		private void DetailsView_ColumnClick(object sender, ColumnClickEventArgs e)
		{
			var detailsList = new List<MovieDetails>();
			for (var i = 0; i < DetailsView.Items.Count; i++)
			{
				detailsList.Add(new MovieDetails
				{
					Keys = DetailsView.Items[i].Text,
					Values = DetailsView.Items[i].SubItems[1].Text,
					BackgroundColor = DetailsView.Items[i].BackColor
				});
			}

			var columnName = DetailsView.Columns[e.Column].Text;
			if (_sortedDetailsCol != columnName)
			{
				_sortDetailsReverse = false;
			}

			switch (columnName)
			{
				// Header, Value
				case "Header":
					if (_sortDetailsReverse)
					{
						detailsList = detailsList
							.OrderByDescending(x => x.Keys)
							.ThenBy(x => x.Values).ToList();
					}
					else
					{
						detailsList = detailsList
						   .OrderBy(x => x.Keys)
						   .ThenBy(x => x.Values).ToList();
					}

					break;
				case "Value":
					if (_sortDetailsReverse)
					{
						detailsList = detailsList
							.OrderByDescending(x => x.Values)
							.ThenBy(x => x.Keys).ToList();
					}
					else
					{
						detailsList = detailsList
							.OrderBy(x => x.Values)
							.ThenBy(x => x.Keys).ToList();
					}

					break;
			}

			DetailsView.Items.Clear();
			foreach (var detail in detailsList)
			{
				var item = new ListViewItem { Text = detail.Keys, BackColor = detail.BackgroundColor };
				item.SubItems.Add(detail.Values);
				DetailsView.Items.Add(item);
			}

			_sortedDetailsCol = columnName;
			_sortDetailsReverse = !_sortDetailsReverse;
		}

		private void CommentsBtn_Click(object sender, EventArgs e)
		{
			var indices = MovieView.SelectedIndices;
			if (indices.Count > 0)
			{
				var form = new EditCommentsForm();
				form.GetMovie(_movieList[MovieView.SelectedIndices[0]]);
				form.Show();
			}
		}

		private void SubtitlesBtn_Click(object sender, EventArgs e)
		{
			var indices = MovieView.SelectedIndices;
			if (indices.Count > 0)
			{
				var s = new EditSubtitlesForm { ReadOnly = true };
				s.GetMovie(_movieList[MovieView.SelectedIndices[0]]);
				s.Show();
			}
		}

		#endregion

		#region Misc Widgets

		private void BrowseMovies_Click(object sender, EventArgs e)
		{
			var ofd = new OpenFileDialog
			{
				Filter = "Movie Files (*." + MovieService.DefaultExtension + ")|*." + MovieService.DefaultExtension +
					"|TAS project Files (*." + TasMovie.Extension + ")|*." + TasMovie.Extension +
					"|All Files|*.*",
				InitialDirectory = PathManager.MakeAbsolutePath(Global.Config.PathEntries.MoviesPathFragment, null)
			};

			var result = ofd.ShowHawkDialog();
			if (result == DialogResult.OK)
			{
				var file = new FileInfo(ofd.FileName);
				if (!file.Exists)
				{
					return;
				}

				int? index = AddMovieToList(ofd.FileName, true);
				RefreshMovieList();
				if (index.HasValue)
				{
					MovieView.SelectedIndices.Clear();
					MovieView.setSelection(index.Value);
					MovieView.SelectItem(index.Value, true);
				}
			}
		}

		private void Scan_Click(object sender, EventArgs e)
		{
			ScanFiles();
			PreHighlightMovie();
		}

		private void IncludeSubDirectories_CheckedChanged(object sender, EventArgs e)
		{
			Global.Config.PlayMovie_IncludeSubdir = IncludeSubDirectories.Checked;
			ScanFiles();
			PreHighlightMovie();
		}

		private void MatchHashCheckBox_CheckedChanged(object sender, EventArgs e)
		{
			Global.Config.PlayMovie_MatchHash = MatchHashCheckBox.Checked;
			ScanFiles();
			PreHighlightMovie();
		}

		private void Ok_Click(object sender, EventArgs e)
		{
			Run();
			Global.MovieSession.ReadOnly = ReadOnlyCheckBox.Checked;
			Close();
		}

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

		#endregion

		#endregion
	}
}