/*  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;
using Handbrake.EncodeQueue;

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

        public frmQueue(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();
        }

        /// <summary>
        /// Initializes the Queue list, then shows and activates the window
        /// </summary>
        public new void Show()
        {
            Show(true);
        }

        /// <summary>
        /// Initializes the Queue list only if doSetQueue is true, then shows and activates the window
        /// </summary>
        /// <param name="doSetQueue">Indicates whether to call setQueue() before showing the window</param>
        public void Show(bool doSetQueue)
        {
            if (doSetQueue) setQueue();
            base.Show();
            Activate();
        }

        // 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.pauseEncodeQueue();
            setUIEncodeFinished();
            resetQueue();
            MessageBox.Show("No further items on the queue will start. The current encode process will continue until it is finished. \nClick 'Encode' 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<QueueItem> theQueue = queue.getQueue();
            foreach (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

                // Display The Audio Track Information
                string audio = string.Empty;
                foreach (Functions.AudioTrack track in parsed.AudioInformation)
                {
                    if (audio != "")
                        audio += ", " + track.Encoder;
                    else
                        audio = track.Encoder;
                }
                item.SubItems.Add(audio); // 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.lastQueueItem.Query);
                lbl_source.Text = queue.lastQueueItem.Source;
                lbl_dest.Text = queue.lastQueueItem.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;

                // Display The Audio Track Information
                string audio = string.Empty;
                foreach (Functions.AudioTrack track in parsed.AudioInformation)
                {
                    if (audio != "")
                        audio += ", " + track.Encoder;
                    else
                        audio = track.Encoder;
                }
                lbl_aEnc.Text = audio;
            }
            catch (Exception)
            {
                // Do Nothing
            }
        }
        private void deleteSelectedItems()
        {
            // If there are selected items
            if (list_queue.SelectedIndices.Count > 0)
            {
                // Save the selected indices to select them after the move
                List<int> selectedIndices = new List<int>(list_queue.SelectedIndices.Count);
                foreach (int selectedIndex in list_queue.SelectedIndices)
                    selectedIndices.Add(selectedIndex);

                int firstSelectedIndex = selectedIndices[0];

                // Reverse the list to delete the items from last to first (preserves indices)
                selectedIndices.Reverse();

                // Remove each selected item
                foreach (int selectedIndex in selectedIndices)
                    queue.remove(selectedIndex);

                updateUIElements();

                // Select the item where the first deleted item was previously
                if (firstSelectedIndex < list_queue.Items.Count)
                    list_queue.Items[firstSelectedIndex].Selected = true;
            }

            list_queue.Select(); // Activate the control to show the selected items
        }

        // Queue Management
        private void mnu_up_Click(object sender, EventArgs e)
        {
            moveUp();
        }
        private void mnu_Down_Click(object sender, EventArgs e)
        {
            moveDown();
        }
        private void mnu_delete_Click(object sender, EventArgs e)
        {
            deleteSelectedItems();
        }
        private void btn_up_Click(object sender, EventArgs e)
        {
            moveUp();
        }
        private void btn_down_Click(object sender, EventArgs e)
        {
            moveDown();
        }
        private void btn_delete_Click(object sender, EventArgs e)
        {
            deleteSelectedItems();
        }
        private void list_queue_deleteKey(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Delete)
                deleteSelectedItems();
        }
        private void moveUp()
        {
            // If there are selected items and the first item is not selected
            if (list_queue.SelectedIndices.Count > 0 && !list_queue.SelectedIndices.Contains(0))
            {
                // Copy the selected indices to preserve them during the movement
                List<int> selectedIndices = new List<int>(list_queue.SelectedIndices.Count);
                foreach (int selectedIndex in list_queue.SelectedIndices)
                    selectedIndices.Add(selectedIndex);

                // Move up each selected item
                foreach (int selectedIndex in selectedIndices)
                    queue.moveUp(selectedIndex);

                updateUIElements();

                // Keep the selected item(s) selected, now moved up one index
                foreach (int selectedIndex in selectedIndices)
                    if (selectedIndex - 1 > -1) // Defensive programming: ensure index is good
                        list_queue.Items[selectedIndex - 1].Selected = true;
            }

            list_queue.Select(); // Activate the control to show the selected items
        }
        private void moveDown()
        {
            // If there are selected items and the last item is not selected
            if (list_queue.SelectedIndices.Count > 0 &&
                !list_queue.SelectedIndices.Contains(list_queue.Items[list_queue.Items.Count - 1].Index))
            {
                // Copy the selected indices to preserve them during the movement
                List<int> selectedIndices = new List<int>(list_queue.SelectedIndices.Count);
                foreach (int selectedIndex in list_queue.SelectedIndices)
                    selectedIndices.Add(selectedIndex);

                // Reverse the indices to move the items down from last to first (preserves indices)
                selectedIndices.Reverse();

                // Move down each selected item
                foreach (int selectedIndex in selectedIndices)
                    queue.moveDown(selectedIndex);

                updateUIElements();

                // Keep the selected item(s) selected, now moved down one index
                foreach (int selectedIndex in selectedIndices)
                    if (selectedIndex + 1 < list_queue.Items.Count) // Defensive programming: ensure index is good
                        list_queue.Items[selectedIndex + 1].Selected = true;
            }

            list_queue.Select(); // Activate the control to show the selected items
        }

        // 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.updateQueueRecoveryFile(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();
        }
        private void mnu_readd_Click(object sender, EventArgs e)
        {
            if (queue.lastQueueItem != null)
            {
                queue.add(queue.lastQueueItem.Query, queue.lastQueueItem.Source, queue.lastQueueItem.Destination);
                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);
        }

    }
}