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/*  frmQueue.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. */

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.IO;

namespace Handbrake
{
    public partial class frmQueue : Form
    {
        private delegate void ProgressUpdateHandler();
        private delegate void setEncoding();
        Functions.CLI cliObj = new Functions.CLI();
        Boolean cancel = false;
        Process hbProc = null;

        public frmQueue()
        {
            InitializeComponent();  
        }


        #region Queue / Handling

        public Boolean isEncoding()
        {
            if (hbProc == null)
                return false;
            else
                return true;
        }

        private void btn_encode_Click(object sender, EventArgs e)
        {
            // Reset some values

            if (list_queue.Items.Count != 0)
            {
                lbl_status.Visible = false;
                btn_encode.Enabled = false;
            }
            cancel = false;

            // Start the encode
            try
            {
                if (list_queue.Items.Count != 0)
                {
                    // Setup or reset some values
                    btn_stop.Visible = true;
                    progressBar.Value = 0;
                    lbl_progressValue.Text = "0 %";
                    progressBar.Step = 100 / list_queue.Items.Count;
                    progressBar.Update();
                    //ThreadPool.QueueUserWorkItem(startProc);
                    // Testing a new way of launching a thread. Hopefully will fix a random freeze up of the main thread.
                    Thread theQ = new Thread(startProc);
                    theQ.Start();
                }
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.ToString());
            }
        }

        private void btn_stop_Click(object sender, EventArgs e)
        {
            cancel = true;
            btn_stop.Visible = false;
            btn_encode.Enabled = true;
            MessageBox.Show("No further items on the queue will start. The current encode process will continue until it is finished. \nClick 'Encode Video' when you wish to continue encoding the queue.", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
        }

        private void startProc(object state)
        {
            try
            {

                while (list_queue.Items.Count != 0)
                {
                    string query = list_queue.Items[0].ToString();
                    setEncValue();
                    updateUIElements();


                    hbProc = cliObj.runCli(this, query);

                    hbProc.WaitForExit();
                    hbProc.Close();
                    hbProc.Dispose();
                    hbProc = null;

                    query = "";

                    if (cancel == true)
                    {
                        break;
                    }              
                }

                resetQueue();

               
                // After the encode is done, we may want to shutdown, suspend etc.
                cliObj.afterEncodeAction();
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.ToString());
            }
        }

        private void updateUIElements()
        {
            try
            {
                if (this.InvokeRequired)
                {
                    this.BeginInvoke(new ProgressUpdateHandler(updateUIElements));
                    return;
                }
                this.list_queue.Items.RemoveAt(0);

                progressBar.PerformStep();
                lbl_progressValue.Text = string.Format("{0} %", progressBar.Value);
                progressBar.Update();
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.ToString());
            }
        }

        private void resetQueue()
        {
            try
            {
                if (this.InvokeRequired)
                {
                    this.BeginInvoke(new ProgressUpdateHandler(resetQueue));
                    return;

                }
                btn_stop.Visible = false;
                btn_encode.Enabled = true;

                if (cancel == true)
                {
                    lbl_status.Visible = true;
                    lbl_status.Text = "Encode Queue Cancelled!";
                    text_edit.Text = "";
                }
                else
                {
                    lbl_status.Visible = true;
                    lbl_status.Text = "Encode Queue Completed!";
                    text_edit.Text = "";
                }
                
                lbl_progressValue.Text = "0 %";
                progressBar.Value = 0;
                progressBar.Update();

                lbl_source.Text = "-";
                lbl_dest.Text = "-";
                lbl_vEnc.Text = "-";
                lbl_aEnc.Text = "-";
                lbl_title.Text = "-";
                lbl_chapt.Text = "-";
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.ToString());
            }
        }
        
        private void setEncValue()
        {
            try
            {
                if (this.InvokeRequired)
                {
                    this.BeginInvoke(new setEncoding(setEncValue));
                }

                string query = query = list_queue.Items[0].ToString();

                // found query is a global varible
                Functions.QueryParser parsed = Functions.QueryParser.Parse(query);
                lbl_source.Text = parsed.Source;
                lbl_dest.Text = parsed.Destination;


                if (parsed.DVDTitle == 0)
                    lbl_title.Text = "Auto";
                else
                    lbl_title.Text = parsed.DVDTitle.ToString();

                string chapters = "";
                if (parsed.DVDChapterStart == 0)
                {
                    lbl_chapt.Text = "Auto";
                }
                else
                {
                    chapters = parsed.DVDChapterStart.ToString();
                    if (parsed.DVDChapterFinish != 0)
                        chapters = chapters + " - " + parsed.DVDChapterFinish;
                    lbl_chapt.Text = chapters;
                }

                lbl_vEnc.Text = parsed.VideoEncoder;
                lbl_aEnc.Text = parsed.AudioEncoder1;
            }
            catch (Exception)
            {
                // Do Nothing
            }
        }

        private void list_queue_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (list_queue.SelectedItem != null)
                text_edit.Text = list_queue.SelectedItem.ToString();

            listCount = list_queue.Items.Count;
        }

        #endregion

        #region Buttons

        private void btn_up_Click(object sender, EventArgs e)
        {
            int count = list_queue.Items.Count;
            int itemToMove = list_queue.SelectedIndex;
            int previousItemint = 0;
            String previousItem = "";

            if (itemToMove > 0)
            {
                previousItemint = itemToMove - 1;
                previousItem = list_queue.Items[previousItemint].ToString();
                list_queue.Items[previousItemint] = list_queue.Items[itemToMove];
                list_queue.Items[itemToMove] = previousItem;
                list_queue.SelectedIndex = list_queue.SelectedIndex - 1;
            }
        }

        private void btn_down_Click(object sender, EventArgs e)
        {
            int count = list_queue.Items.Count;
            int itemToMove = list_queue.SelectedIndex;
            int itemAfterInt = 0;
            String itemAfter = "";

            if (itemToMove < (count - 1))
            {
                itemAfterInt = itemToMove + 1;
                itemAfter = list_queue.Items[itemAfterInt].ToString();
                list_queue.Items[itemAfterInt] = list_queue.Items[itemToMove];
                list_queue.Items[itemToMove] = itemAfter;
                list_queue.SelectedIndex = list_queue.SelectedIndex + 1;
            }
        }

        private void btn_delete_Click(object sender, EventArgs e)
        {
            list_queue.Items.Remove(list_queue.SelectedItem);
        }

        private void btn_batch_Click(object sender, EventArgs e)
        {
            string queries = "";
            for (int i = 0; i < list_queue.Items.Count; i++)
            {
                string query = list_queue.Items[i].ToString();
                string fullQuery = '"' + Application.StartupPath.ToString() + "\\HandBrakeCLI.exe" + '"' + query;

                if (queries == "")
                    queries = queries + fullQuery;
                else
                    queries = queries + " && " + fullQuery;
            }
            string strCmdLine = queries;

            SaveFile.ShowDialog();
            string filename = SaveFile.FileName;

            if (filename != "")
            {
                try
                {
                    // Create a StreamWriter and open the file
                    StreamWriter line = new StreamWriter(filename);

                    // Write the batch file query to the file
                    line.WriteLine(strCmdLine);

                    // close the stream
                    line.Close();

                    MessageBox.Show("Your batch script has been sucessfully saved.", "Status", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }
                catch (Exception)
                {
                    MessageBox.Show("Unable to write to the file. Please make sure that the location has the correct permissions for file writing.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Hand);
                }

            }
        }

        int listCount = 0;
        private void btn_updateQuery_Click(object sender, EventArgs e)
        {
            if (text_edit.Text != "")
            {
                if (list_queue.Items.Count != listCount)
                {
                    MessageBox.Show("Unable to modify the selected item. The number of items on the list has changed.  \nPlease avoid modifying an item when a new encode is about to start!", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
                else
                {
                    if (list_queue.SelectedItem != null)
                        list_queue.Items[list_queue.SelectedIndex] = text_edit.Text;

                }
            }
        }

        private void btn_Close_Click(object sender, EventArgs e)
        {
            this.Hide();
        }

        #endregion   

        protected override void OnClosing(CancelEventArgs e)
        {
            e.Cancel = true;
            this.Hide();
            base.OnClosing(e);
        }
      
    }
}