/*  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.Windows.Forms;

namespace Handbrake
{
    public partial class frmQueue : Form
    {
        private delegate void UpdateHandler();
        Queue.QueueHandler queue;

        public frmQueue(Queue.QueueHandler q)
        {
            InitializeComponent();

            this.queue = q;
            queue.OnEncodeStart += new EventHandler(queue_OnEncodeStart);
            queue.OnQueueFinished += new EventHandler(queue_OnQueueFinished);
            queue.OnPaused += new EventHandler(queue_OnPaused);
        }
        void queue_OnPaused(object sender, EventArgs e)
        {
            setUIEncodeFinished();
            updateUIElements();
        }
        void queue_OnQueueFinished(object sender, EventArgs e)
        {
            setUIEncodeFinished();
            resetQueue(); // Reset the Queue Window
        }
        void queue_OnEncodeStart(object sender, EventArgs e)
        {
            setUIEncodeStarted(); // make sure the UI is set correctly
            setCurrentEncodeInformation();
            updateUIElements(); // Redraw the Queue, a new encode has started.
        }

        /// <summary>
        /// Initializes the Queue list with the Arraylist from the Queue class
        /// </summary>
        public void setQueue()
        {
            updateUIElements();
        }

        // Start and Stop Controls
        private void btn_encode_Click(object sender, EventArgs e)
        {
            if (queue.isPaused)
            {
                setUIEncodeStarted();
                MessageBox.Show("Encoding restarted", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }

            if (!queue.isEncodeStarted)
                queue.startEncode();

        }
        private void btn_pause_Click(object sender, EventArgs e)
        {
            queue.pauseEncode();
            setUIEncodeFinished();
            resetQueue();
            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);
        }

        // Window Display Management
        private void setUIEncodeStarted()
        {
            if (InvokeRequired)
            {
                BeginInvoke(new UpdateHandler(setUIEncodeStarted));
                return;
            }
            btn_encode.Enabled = false;
            btn_pause.Visible = true;
        }
        private void setUIEncodeFinished()
        {
            if (InvokeRequired)
            {
                BeginInvoke(new UpdateHandler(setUIEncodeFinished));
                return;
            }
            btn_pause.Visible = false;
            btn_encode.Enabled = true;
        }
        private void resetQueue()
        {
            if (InvokeRequired)
            {
                BeginInvoke(new UpdateHandler(resetQueue));
                return;
            }
            btn_pause.Visible = false;
            btn_encode.Enabled = true;

            lbl_source.Text = "-";
            lbl_dest.Text = "-";
            lbl_vEnc.Text = "-";
            lbl_aEnc.Text = "-";
            lbl_title.Text = "-";
            lbl_chapt.Text = "-";

            lbl_encodesPending.Text = list_queue.Items.Count + " encode(s) pending";
        }
        private void redrawQueue()
        {
            if (InvokeRequired)
            {
                BeginInvoke(new UpdateHandler(redrawQueue));
                return;
            }

            list_queue.Items.Clear();
            List<Queue.QueueItem> theQueue = queue.getQueue();
            foreach (Queue.QueueItem queue_item in theQueue)
            {
                string q_item = queue_item.Query;
                Functions.QueryParser parsed = Functions.QueryParser.Parse(q_item);

                // Get the DVD Title
                 string title = parsed.DVDTitle == 0 ? "Auto" : parsed.DVDTitle.ToString();

                // Get the DVD Chapters
                string chapters;
                if (parsed.DVDChapterStart == 0)
                    chapters = "Auto";
                else
                {
                    chapters = parsed.DVDChapterStart.ToString();
                    if (parsed.DVDChapterFinish != 0)
                        chapters = chapters + " - " + parsed.DVDChapterFinish;
                }

                ListViewItem item = new ListViewItem();
                item.Text = title; // Title
                item.SubItems.Add(chapters); // Chapters
                item.SubItems.Add(queue_item.Source); // Source
                item.SubItems.Add(queue_item.Destination); // Destination
                item.SubItems.Add(parsed.VideoEncoder); // Video
                item.SubItems.Add(parsed.AudioEncoder1); // Audio

                list_queue.Items.Add(item);
            }
        }
        private void updateUIElements()
        {
            if (InvokeRequired)
            {
                BeginInvoke(new UpdateHandler(updateUIElements));
                return;
            }

            redrawQueue();
            lbl_encodesPending.Text = list_queue.Items.Count + " encode(s) pending";
        }
        private void setCurrentEncodeInformation()
        {
            try
            {
                if (InvokeRequired)
                {
                    BeginInvoke(new UpdateHandler(setCurrentEncodeInformation));
                }

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

                lbl_title.Text = parsed.DVDTitle == 0 ? "Auto" : parsed.DVDTitle.ToString();

                if (Equals(parsed.DVDChapterStart, 0))
                  lbl_chapt.Text = "Auto";
                else
                {
                    string 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
            }
        }

        // Queue Management
        private void btn_up_Click(object sender, EventArgs e)
        {
            if (list_queue.SelectedIndices.Count != 0)
            {
                int selected = list_queue.SelectedIndices[0];

                queue.moveUp(selected);
                queue.write2disk("hb_queue_recovery.xml"); // Update the queue recovery file
                updateUIElements();

                if (selected - 1 > 0)
                    list_queue.Items[selected - 1].Selected = true;

                list_queue.Select();
            }
        }
        private void btn_down_Click(object sender, EventArgs e)
        {
            if (list_queue.SelectedIndices.Count != 0)
            {
                int selected = list_queue.SelectedIndices[0];

                queue.moveDown(list_queue.SelectedIndices[0]);
                queue.write2disk("hb_queue_recovery.xml"); // Update the queue recovery file
                updateUIElements();

                if (selected + 1 < list_queue.Items.Count)
                    list_queue.Items[selected + 1].Selected = true;

                list_queue.Select();
            }
        }
        private void btn_delete_Click(object sender, EventArgs e)
        {
            if (list_queue.SelectedIndices.Count != 0)
            {
                queue.remove(list_queue.SelectedIndices[0]);
                queue.write2disk("hb_queue_recovery.xml"); // Update the queue recovery file
                updateUIElements();
                lbl_encodesPending.Text = list_queue.Items.Count + " encode(s) pending";
            }
        }
        private void list_queue_deleteKey(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Delete)
            {
                if (list_queue.SelectedIndices.Count != 0)
                {
                    queue.remove(list_queue.SelectedIndices[0]);
                    queue.write2disk("hb_queue_recovery.xml"); // Update the queue recovery file
                    updateUIElements();
                }
            }
        }

        // Queue Import/Export Features
        private void mnu_batch_Click(object sender, EventArgs e)
        {
            SaveFile.FileName = "";
            SaveFile.Filter = "Batch|.bat";
            SaveFile.ShowDialog();
            if (SaveFile.FileName != String.Empty)
                queue.writeBatchScript(SaveFile.FileName);
        }
        private void mnu_export_Click(object sender, EventArgs e)
        {
            SaveFile.FileName = "";
            SaveFile.Filter = "HandBrake Queue|*.queue";
            SaveFile.ShowDialog();
            if (SaveFile.FileName != String.Empty)
                queue.write2disk(SaveFile.FileName);
        }
        private void mnu_import_Click(object sender, EventArgs e)
        {
            OpenFile.FileName = "";
            OpenFile.ShowDialog();
            if (OpenFile.FileName != String.Empty)
                queue.recoverQueue(OpenFile.FileName);
            updateUIElements();
        }

        // Hide's the window when the user tries to "x" out of the window instead of closing it.
        protected override void OnClosing(CancelEventArgs e)
        {
            e.Cancel = true;
            this.Hide();
            base.OnClosing(e);
        }
    }
}