/*  frmPreview.cs $
    This file is part of the HandBrake source code.
    Homepage: <http://handbrake.fr/>.
    It may be used under the terms of the GNU General Public License. */

namespace Handbrake
{
    using System;
    using System.Diagnostics;
    using System.IO;
    using System.Runtime.InteropServices;
    using System.Threading;
    using System.Windows;
    using System.Windows.Forms;
    using Functions;

    using HandBrake.ApplicationServices.Services;
    using HandBrake.ApplicationServices.Services.Interfaces;

    using QTOControlLib;
    using QTOLibrary;

    using MessageBox = System.Windows.Forms.MessageBox;

    /// <summary>
    /// The Preview Window
    /// </summary>
    public partial class frmPreview : Form
    {
        #region Private Variables

        /// <summary>
        /// The Main Window
        /// </summary>
        private readonly frmMain mainWindow;

        /// <summary>
        /// True if QT is not installed
        /// </summary>
        private readonly bool noQt;

        /// <summary>
        /// The encode queue
        /// </summary>
        private readonly IQueue encodeQueue = new Queue();

        /// <summary>
        /// What is currently playing
        /// </summary>
        private string currentlyPlaying = string.Empty;

        /// <summary>
        /// Play With VLC tracker
        /// </summary>
        private bool playWithVlc;

        /// <summary>
        /// A Thread for the video player
        /// </summary>
        private Thread player;

        #endregion

        /// <summary>
        /// Initializes a new instance of the <see cref="frmPreview"/> class.
        /// </summary>
        /// <param name="mw">
        /// The mw.
        /// </param>
        public frmPreview(frmMain mw)
        {
            try
            {
                InitializeComponent();
            }
            catch (Exception)
            {
                this.noQt = true;

                int borderWidth = (this.Width - this.ClientSize.Width) / 2;
                int titlebarAndBorder = this.Height - this.ClientSize.Height;

                this.Height = toolBar.Height + titlebarAndBorder + 1;
                btn_playQT.Enabled = false;
                btn_playQT.Visible = false;
            }

            this.mainWindow = mw;

            cb_preview.SelectedIndex = 0;
            cb_duration.SelectedIndex = 1;

            cb_preview.Items.Clear();
            for (int i = 1; i <= Properties.Settings.Default.previewScanCount; i++)
            {
                cb_preview.Items.Add(i.ToString());
            }

            cb_preview.SelectedIndex = 0;

            encodeQueue.EncodeStarted += this.EncodeQueueEncodeStarted;
            encodeQueue.EncodeEnded += this.EncodeQueueEncodeEnded;
        }

        #region Delegates
        /// <summary>
        /// Update UI Delegate
        /// </summary>
        /// <param name="sender">
        /// The sender.
        /// </param>
        /// <param name="e">
        /// The e.
        /// </param>
        private delegate void UpdateUiHandler(object sender, EventArgs e);

        /// <summary>
        /// The Open Movie Handler
        /// </summary>
        private delegate void OpenMovieHandler();
        #endregion

        #region Event Handlers
        /// <summary>
        /// The encode has started
        /// </summary>
        /// <param name="sender">
        /// The sender.
        /// </param>
        /// <param name="e">
        /// The e.
        /// </param>
        private void EncodeQueueEncodeStarted(object sender, EventArgs e)
        {
            encodeQueue.EncodeStatusChanged += this.EncodeQueueEncodeStatusChanged;
        }

        /// <summary>
        /// The Enocde has ended
        /// </summary>
        /// <param name="sender">
        /// The sender.
        /// </param>
        /// <param name="e">
        /// The e.
        /// </param>
        private void EncodeQueueEncodeEnded(object sender, EventArgs e)
        {
            encodeQueue.EncodeStatusChanged -= this.EncodeQueueEncodeStatusChanged;

            try
            {
                if (this.InvokeRequired)
                {
                    this.BeginInvoke(new UpdateUiHandler(EncodeQueueEncodeEnded), new[] { sender, e });
                    return;
                }

                ProgressBarStatus.Visible = false;
                lbl_encodeStatus.Visible = false;

                if (!this.noQt)
                    btn_playQT.Enabled = true;
                btn_playVLC.Enabled = true;

                this.Text = this.Text.Replace(" (Encoding)", string.Empty);

                // Get the sample filename
                if (this.mainWindow.text_destination.Text != string.Empty)
                    this.currentlyPlaying =
                        this.mainWindow.text_destination.Text.Replace(".mp4", "_sample.mp4").Replace(".m4v", "_sample.m4v").
                            Replace(".mkv", "_sample.mkv");

                // Play back in QT or VLC
                if (!playWithVlc)
                    Play();
                else
                    PlayVlc();
            }
            catch (Exception exc)
            {
                Main.ShowExceptiowWindow("An Unexpected error has occured", exc.ToString());
            }
        }

        /// <summary>
        /// Encode status has changed
        /// </summary>
        /// <param name="sender">
        /// The sender.
        /// </param>
        /// <param name="e">
        /// The e.
        /// </param>
        private void EncodeQueueEncodeStatusChanged(object sender, HandBrake.ApplicationServices.EncodeProgressEventArgs e)
        {
            if (this.InvokeRequired)
            {
                this.BeginInvoke(new Encode.EncodeProgessStatus(this.EncodeQueueEncodeStatusChanged), new[] { sender, e });
                return;
            }

            lbl_encodeStatus.Text = e.PercentComplete + "%";
            ProgressBarStatus.Value = (int)Math.Round(e.PercentComplete);
        }
        #endregion

        #region Encode Sample

        /// <summary>
        /// Play with VLC
        /// </summary>
        /// <param name="sender">
        /// The sender.
        /// </param>
        /// <param name="e">
        /// The e.
        /// </param>
        private void PlayVlcClick(object sender, EventArgs e)
        {
            ProgressBarStatus.Visible = true;
            ProgressBarStatus.Value = 0;
            lbl_encodeStatus.Visible = true;
            playWithVlc = true;
            this.panel1.Visible = false;
            
            try
            {
                if (!this.noQt)
                    QTControl.URL = string.Empty;

                if (File.Exists(this.currentlyPlaying))
                    File.Delete(this.currentlyPlaying);
            }
            catch (Exception)
            {
                MessageBox.Show(this, "存在するプレビュー用ファイルを削除できません。アプリケーションを再起動すると解決するかもしれません。", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

            btn_playQT.Enabled = false;
            btn_playVLC.Enabled = false;
            this.Text += " (Encoding)";
            int duration;
            int.TryParse(cb_duration.Text, out duration);
            string query = QueryGenerator.GeneratePreviewQuery(this.mainWindow, duration, cb_preview.Text);
            ThreadPool.QueueUserWorkItem(this.CreatePreview, query);
        }

        /// <summary>
        /// Encode and Play with QT
        /// </summary>
        /// <param name="sender">
        /// The sender.
        /// </param>
        /// <param name="e">
        /// The e.
        /// </param>
        private void PlayQtClick(object sender, EventArgs e)
        {
            playWithVlc = false;
            this.panel1.Visible = true;
            if (this.noQt)
            {
                MessageBox.Show(this,
                                "QuickTime 7がインストールされていないか、利用できない状態です。QuickTimeをインストールもしくは再インストールしてください。",
                                "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (this.mainWindow.text_destination.Text.Contains(".mkv"))
            {
                MessageBox.Show(this,
                                "QuickTimeはMKVファイルをサポートしていません。VLCを利用してください。",
                                "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            else
            {
                ProgressBarStatus.Visible = true;
                ProgressBarStatus.Value = 0;
                lbl_encodeStatus.Visible = true;
                try
                {
                    QTControl.URL = string.Empty;
                    if (File.Exists(this.currentlyPlaying))
                        File.Delete(this.currentlyPlaying);
                }
                catch (Exception)
                {
                    MessageBox.Show(this, "以前作成したプレビュー用ファイルを削除できません。アプリケーションを再起動すると解決するかもしれません。", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }

                btn_playQT.Enabled = false;
                btn_playVLC.Enabled = false;
                this.Text += " (Encoding)";
                int duration;
                int.TryParse(cb_duration.Text, out duration);
                string query = QueryGenerator.GeneratePreviewQuery(this.mainWindow, duration, cb_preview.Text);

                ThreadPool.QueueUserWorkItem(this.CreatePreview, query);
            }
        }

        /// <summary>
        /// Create the Preview.
        /// </summary>
        /// <param name="state">
        /// The state.
        /// </param>
        private void CreatePreview(object state)
        {
            // Make sure we are not already encoding and if we are then display an error.
            if (encodeQueue.IsEncoding)
            {
                MessageBox.Show(
                    this,
                    "Handbrake is already encoding a video!",
                    "Warning",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Warning);

                return;
            }

            encodeQueue.CreatePreviewSample((string)state);
        }

        #endregion

        #region Playback

        /// <summary>
        /// Play the video back in the QuickTime control
        /// </summary>
        private void Play()
        {
            this.player = new Thread(OpenMovie) { IsBackground = true };
            this.player.Start();
        }

        /// <summary>
        /// Play the video back in an external VLC Player
        /// </summary>
        private void PlayVlc()
        {
            // Launch VLC and Play video.
            if (this.currentlyPlaying != string.Empty)
            {
                if (File.Exists(this.currentlyPlaying))
                {
                    // Attempt to find VLC if it doesn't exist in the default set location.
                    string vlcPath;

                    if (8 == IntPtr.Size ||
                        (!String.IsNullOrEmpty(Environment.GetEnvironmentVariable("PROCESSOR_ARCHITEW6432"))))
                        vlcPath = Environment.GetEnvironmentVariable("ProgramFiles(x86)");
                    else
                        vlcPath = Environment.GetEnvironmentVariable("ProgramFiles");

                    vlcPath = vlcPath != null
                                  ? vlcPath + @"\VideoLAN\VLC\vlc.exe"
                                  : @"C:\Program Files (x86)\VideoLAN\VLC\vlc.exe";

                    if (!File.Exists(Properties.Settings.Default.VLC_Path))
                    {
                        if (File.Exists(vlcPath))
                        {
                            Properties.Settings.Default.VLC_Path = "C:\\Program Files (x86)\\VideoLAN\\VLC\\vlc.exe";
                            Properties.Settings.Default.Save(); // Save this new path if it does
                        }
                        else
                        {
                            MessageBox.Show(this,
                                            "Unable to detect VLC Player. \nPlease make sure VLC is installed and the directory specified in HandBrake's options is correct. (See: \"Tools Menu > Options > Picture Tab\") ",
                                            "VLC", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        }
                    }

                    if (File.Exists(Properties.Settings.Default.VLC_Path))
                    {
                        string args = "\"" + this.currentlyPlaying + "\"";
                        ProcessStartInfo vlc = new ProcessStartInfo(Properties.Settings.Default.VLC_Path, args);
                        Process.Start(vlc);
                    }
                }
                else
                        MessageBox.Show(this, "VLCを見つけられませんでした。VLCがインストールされているか、またオプションで正しいパスを指定しているかどうかを確認してください。\nこの設定は、「ツール」メニューの「オプション」を選択→「画像」タブで変更できます。", "VLC", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }

        /// <summary>
        /// QT control - Open the file
        /// </summary>
        [STAThread]
        private void OpenMovie()
        {
            try
            {
                if (InvokeRequired)
                {
                    BeginInvoke(new OpenMovieHandler(OpenMovie));
                    return;
                }
                QTControl.URL = this.currentlyPlaying;
                QTControl.SetSizing(QTSizingModeEnum.qtControlFitsMovie, true);
                QTControl.URL = this.currentlyPlaying;
                QTControl.Show();

                this.ClientSize = QTControl.Size;
                this.Height += toolBar.Height;
            }
            catch (COMException ex)
            {
                QTUtils qtu = new QTUtils();
                Main.ShowExceptiowWindow("動画ファイルを開けませんでした。", ex + Environment.NewLine + qtu.QTErrorFromErrorCode(ex.ErrorCode));
            }
            catch (Exception ex)
            {
                Main.ShowExceptiowWindow("動画ファイルを開けませんでした。", ex.ToString());
            }
        }

        #endregion

        /// <summary>
        /// Remove any subscribed events then close.
        /// </summary>
        /// <param name="e">
        /// The e.
        /// </param>
        protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
        {
            encodeQueue.EncodeStarted -= this.EncodeQueueEncodeStarted;
            encodeQueue.EncodeEnded -= this.EncodeQueueEncodeEnded;
            base.OnClosing(e);
        }
    }
}