using System;
using System.Windows.Forms;
using System.Threading;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.IO;
using QTOLibrary;

namespace Handbrake
{
    public partial class frmPreview : Form
    {

        QueryGenerator hb_common_func = new QueryGenerator();
        Functions.Encode process = new Functions.Encode();
        private delegate void UpdateUIHandler();
        String currently_playing = "";
        readonly frmMain mainWindow;
        private Process hbProc;
        private Thread player;
        private Boolean noQT;

        public frmPreview(frmMain mw)
        {
            try
            {
                InitializeComponent();
            }
            catch (Exception exc)
            {
                MessageBox.Show("It would appear QuickTime 7 is not installed. QuickTime preview functionality will be disabled! \n\n Debug Info:\n" + exc, "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                btn_playQT.Enabled = false;
                noQT = true;
            }
            this.mainWindow = mw;
            cb_preview.SelectedIndex = 0;
            cb_duration.SelectedIndex = 1;
        }
 
        #region Encode Sample
        private void btn_playVLC_Click(object sender, EventArgs e)
        {
            btn_playQT.Enabled = false;
            btn_playVLC.Enabled = false;
            lbl_status.Text = "Encoding Sample for (VLC) ...";
            String query = hb_common_func.GeneratePreviewQuery(mainWindow, cb_duration.Text, cb_preview.Text);
            ThreadPool.QueueUserWorkItem(procMonitor, query);  
        }
        private void btn_playQT_Click(object sender, EventArgs e)
        {
            btn_playQT.Enabled = false;
            btn_playVLC.Enabled = false;
            lbl_status.Text = "Encoding Sample for (QT) ...";
            String query = hb_common_func.GeneratePreviewQuery(mainWindow, cb_duration.Text, cb_preview.Text);
            ThreadPool.QueueUserWorkItem(procMonitor, query);
        }
        private void procMonitor(object state)
        {
            // Make sure we are not already encoding and if we are then display an error.
            if (hbProc != null)
                MessageBox.Show("Handbrake is already encoding a video!", "Status", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            else
            {
                hbProc = process.runCli(this, (string)state);
                hbProc.WaitForExit();
                hbProc = null;
                encodeCompleted();
            }
        }
        private void encodeCompleted()
        {
            try
            {
                if (InvokeRequired)
                {
                    BeginInvoke(new UpdateUIHandler(encodeCompleted));
                    return;
                }
                if (!noQT)
                    btn_playQT.Enabled = true;
                btn_playVLC.Enabled = true;

                // Decide which player to use.
                String playerSelection = lbl_status.Text.Contains("QT") ? "QT" : "VLC";

                lbl_status.Text = "Loading Clip ...";

                // Get the sample filename
                if (mainWindow.text_destination.Text != "")
                    currently_playing = mainWindow.text_destination.Text.Replace(".mp4", "_sample.mp4").Replace(".m4v", "_sample.m4v").Replace(".avi", "_sample.avi").Replace(".ogm", "_sample.ogm");

                // Play back in QT or VLC
                if (playerSelection == "QT")
                    play();
                else 
                    playVLC();
                
                lbl_status.Text = "";
            }
            catch (Exception exc)
            {
                MessageBox.Show("frmPreview.cs encodeCompleted " + exc, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        #endregion

        #region Playback

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

        /// <summary>
        /// Play the video back in an external VLC player
        /// </summary>
        private void playVLC()
        {
            // Launch VLC and play video.
            if (currently_playing != "")
            {
                if (File.Exists(currently_playing))
                {
                    if (File.Exists(Properties.Settings.Default.VLC_Path))
                    {
                        String args = "\"" + currently_playing + "\"";
                        ProcessStartInfo vlc = new ProcessStartInfo(Properties.Settings.Default.VLC_Path, args);
                        Process.Start(vlc);
                        lbl_status.Text = "VLC will now launch.";
                    }
                    else
                        MessageBox.Show("Unable to detect VLC Player. \nPlease make sure VLC is installed and the directory specified in the program options is correct.", "VLC", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
                else
                    MessageBox.Show("Unable to find the preview file. Either the file was deleted or the encode failed. Check the activity log for details.", "VLC", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }

        /// <summary>
        /// QT control - Open the file
        /// </summary>
        [STAThread]
        private void OpenMovie()
        {
            try
            {
                if (InvokeRequired)
                {
                    BeginInvoke(new UpdateUIHandler(OpenMovie));
                    return;
                }
                QTControl.URL = currently_playing;
                QTControl.Width = QTControl.Movie.Width;
                QTControl.Height = QTControl.Movie.Height;
                // The initial control size is 64,64. If we do not reload the clip here
                // it'll scale the video from 64,64. 
                // Unsure why as it correctly resizes the control to the movies actual size.
                QTControl.URL = currently_playing;
                QTControl.SetScale(0);
                QTControl.Show();

                this.Width = QTControl.Width + 5;
                this.Height = QTControl.Height + 90;
            }
            catch (COMException ex)
            {
                QTUtils qtu = new QTUtils();
                MessageBox.Show("Unable to open movie:\n\nError Code: " + ex.ErrorCode.ToString("X") + "\nQT Error code : " + qtu.QTErrorFromErrorCode(ex.ErrorCode));
            }
            catch (Exception ex)
            {
                MessageBox.Show("Unable to open movie:\n\n" + ex);
            }
        }
        #endregion
    }
}