using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using Klocman.Extensions;
using Klocman.Forms;
using Klocman.Forms.Tools;
using Klocman.Tools;
using UninstallTools.Properties;
using UninstallTools.Startup;
using UninstallTools.Startup.Browser;
using UninstallTools.Startup.Normal;
using UninstallTools.Startup.Task;

namespace UninstallTools.Dialogs
{
    public partial class StartupManagerWindow : Form
    {
        private StartupManagerWindow()
        {
            InitializeComponent();

            comboBoxFilter.SelectedIndex = 0;
        }

        private List<StartupEntryBase> AllItems { get; set; }

        private IEnumerable<StartupEntryBase> Selection
        {
            get { return listView1.SelectedItems.Cast<ListViewItem>().Select(x => x.Tag as StartupEntryBase); }
        }

        /*private IEnumerable<StartupEntryBase> VisibleItems
        {
            get { return listView1.Items.Cast<ListViewItem>().Select(x => x.Tag as StartupEntryBase); }
        }*/

        /// <summary>
        ///     Show startup manager dialog. Returns latest startup entry list.
        /// </summary>
        /// <param name="owner">Parent form</param>
        public static IEnumerable<StartupEntryBase> ShowManagerDialog(Form owner)
        {
            using (var window = new StartupManagerWindow())
            {
                if (owner != null)
                {
                    window.StartPosition = FormStartPosition.CenterParent;
                    window.Icon = owner.Icon;
                }
                window.ShowDialog(owner);
                return window.AllItems;
            }
        }

        private void buttonExport_Click(object sender, EventArgs e)
        {
            exportDialog.ShowDialog();
        }

        private void buttonRefresh_Click(object sender, EventArgs e)
        {
            ReloadItems(sender, e);
        }

        private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
        {
            e.Cancel = true;
            moveToRegistryToolStripMenuItem.Enabled = false;

            CheckState? enableCheckState = null;
            CheckState? allUserCheckState = null;
            foreach (var item in Selection)
            {
                e.Cancel = false;

                if (!enableCheckState.HasValue)
                    enableCheckState = item.Disabled ? CheckState.Unchecked : CheckState.Checked;
                else if (enableCheckState.Value != (item.Disabled ? CheckState.Unchecked : CheckState.Checked))
                    enableCheckState = CheckState.Indeterminate;

                var normalStartupEntry = item as StartupEntry;
                if (normalStartupEntry != null)
                {
                    if (!allUserCheckState.HasValue)
                        allUserCheckState = normalStartupEntry.AllUsers ? CheckState.Checked : CheckState.Unchecked;
                    else if (allUserCheckState.Value !=
                             (normalStartupEntry.AllUsers ? CheckState.Checked : CheckState.Unchecked))
                        allUserCheckState = CheckState.Indeterminate;

                    if (!normalStartupEntry.IsRegKey)
                        moveToRegistryToolStripMenuItem.Enabled = true;
                }
            }

            enableToolStripMenuItem.Enabled = enableCheckState.HasValue;
            enableToolStripMenuItem.CheckState = enableCheckState ?? CheckState.Unchecked;

            runForAllUsersToolStripMenuItem.Enabled = allUserCheckState.HasValue;
            runForAllUsersToolStripMenuItem.CheckState = allUserCheckState ?? CheckState.Unchecked;
        }

        private void copyToClipboardToolStripMenuItem_Click(object sender, EventArgs e)
        {
            var parts = Selection.Select(x => x.ToLongString()).ToArray();
            if (parts.Any())
            {
                try
                {
                    Clipboard.SetText(string.Join(Environment.NewLine, parts));
                }
                catch (Exception ex)
                {
                    PremadeDialogs.GenericError(ex);
                }
            }
        }

        private void DeleteSelected()
        {
            if (CustomMessageBox.ShowDialog(this, new CmbBasicSettings(
                Localisation.StartupManager_Message_Delete_Title, Localisation.StartupManager_Message_Delete_Header,
                Localisation.StartupManager_Message_Delete_Details,
                SystemIcons.Question, Buttons.ButtonRemove, Buttons.ButtonCancel)) ==
                CustomMessageBox.PressedButton.Middle)
            {
                try
                {
                    foreach (var item in Selection)
                    {
                        item.Delete();
                    }
                }
                catch (Exception ex)
                {
                    PremadeDialogs.GenericError(ex);
                }
            }
        }

        private void deleteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DeleteSelected();

            ReloadItems(sender, e);
        }

        private void listView1_MouseClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                if (listView1.SelectedItems.Count > 0 && listView1.FocusedItem.Bounds.Contains(e.Location))
                {
                    contextMenuStrip.Show(Cursor.Position);
                }
            }
        }

        private void listView1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (listView1.SelectedItems.Count > 0 && listView1.FocusedItem.Bounds.Contains(e.Location))
            {
                openFileLocationToolStripMenuItem_Click(sender, e);
            }
        }

        private void openFileLocationToolStripMenuItem_Click(object sender, EventArgs e)
        {
            foreach (var item in Selection)
            {
                try
                {
                    WindowsTools.OpenExplorerFocusedOnObject(item.CommandFilePath);
                }
                catch (Exception ex)
                {
                    PremadeDialogs.GenericError(ex);
                }
            }
        }

        private void openLinkLocationToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                StartupManager.OpenStartupEntryLocations(Selection);
            }
            catch (Exception ex)
            {
                PremadeDialogs.GenericError(ex);
            }
        }

        private void ReloadItems(object sender, EventArgs e)
        {
            Cursor = Cursors.WaitCursor;
            if (listView1.Items.Count < 1)
            {
                listView1.Items.Add(Localisation.StartupManager_Loading);
                listView1.Update();
            }

            SelectionChanged(sender, e);

            listView1.BeginUpdate();

            AllItems = StartupManager.GetAllStartupItems().ToList();

            // Get icons
            if (listView1.SmallImageList == null)
                listView1.SmallImageList = new ImageList();
            listView1.SmallImageList.Images.Clear();
            listView1.SmallImageList.Images.Add(SystemIcons.Warning);
            foreach (var entry in AllItems)
            {
                try
                {
                    if (entry.CommandFilePath != null && !listView1.SmallImageList.Images.ContainsKey(entry.ProgramName)
                        && File.Exists(entry.CommandFilePath))
                    {
                        var icon = Icon.ExtractAssociatedIcon(entry.CommandFilePath);
                        if (icon != null)
                            listView1.SmallImageList.Images.Add(entry.ProgramName, icon);
                    }
                }
                catch
                {
                    // Ignore failed icon gets
                }
            }

            UpdateList(false);

            listView1.EndUpdate();
            Cursor = Cursors.Default;
        }

        private void UpdateList(bool pauseLvUpdates = true)
        {
            if (pauseLvUpdates)
            {
                Cursor = Cursors.WaitCursor;
                listView1.BeginUpdate();
            }

            var query = from item in AllItems
                where comboBoxFilter.SelectedIndex == 0 ||
                      comboBoxFilter.SelectedIndex == 1 && item is StartupEntry ||
                      comboBoxFilter.SelectedIndex == 2 && item is TaskEntry ||
                      comboBoxFilter.SelectedIndex == 3 && item is BrowserHelperEntry
                orderby item.ProgramName ascending
                select new ListViewItem(new[]
                {
                    item.ProgramName,
                    (!item.Disabled).ToYesNo(),
                    item.Company,
                    item.ParentShortName,
                    item.Command
                })
                {
                    Tag = item,
                    ForeColor = item.Disabled ? SystemColors.GrayText : SystemColors.ControlText,
                    ImageIndex = Math.Max(listView1.SmallImageList.Images.IndexOfKey(item.ProgramName), 0)
                };

            // Populate list items
            listView1.Items.Clear();
            listView1.Items.AddRange(query.ToArray());

            if (pauseLvUpdates)
            {
                listView1.EndUpdate();
                Cursor = Cursors.Default;
            }
        }

        private void runCommandToolStripMenuItem_Click(object sender, EventArgs e)
        {
            foreach (var command in Selection)
            {
                if (!PremadeDialogs.StartProcessSafely(command.Command))
                    break;
            }
        }

        private void saveFileDialog1_FileOk(object sender, CancelEventArgs e)
        {
            var parts = Selection.Select(x => x.ToLongString()).ToArray();
            if (parts.Any())
            {
                try
                {
                    File.WriteAllText(exportDialog.FileName, string.Join(Environment.NewLine, parts));
                }
                catch (Exception ex)
                {
                    PremadeDialogs.GenericError(ex);
                    e.Cancel = true;
                }
            }
        }

        private void SelectionChanged(object sender, EventArgs e)
        {
            var sel = listView1.SelectedItems.Count > 0;
            buttonExport.Enabled = sel;
        }

        private void StartupManagerWindow_Shown(object sender, EventArgs e)
        {
            Refresh();
            ReloadItems(sender, e);
        }

        private void enableToolStripMenuItem_Click(object sender, EventArgs e)
        {
            enableToolStripMenuItem.CheckState = enableToolStripMenuItem.CheckState == CheckState.Unchecked
                ? CheckState.Checked
                : CheckState.Unchecked;

            foreach (var item in Selection)
            {
                try
                {
                    item.Disabled = enableToolStripMenuItem.CheckState == CheckState.Unchecked;
                }
                catch (Exception ex)
                {
                    PremadeDialogs.GenericError(ex);
                }
            }

            UpdateList();
        }

        private void runForAllUsersToolStripMenuItem_Click(object sender, EventArgs e)
        {
            runForAllUsersToolStripMenuItem.CheckState = runForAllUsersToolStripMenuItem.CheckState ==
                                                         CheckState.Unchecked
                ? CheckState.Checked
                : CheckState.Unchecked;

            foreach (var item in Selection.OfType<StartupEntry>())
            {
                try
                {
                    item.AllUsers = runForAllUsersToolStripMenuItem.CheckState == CheckState.Checked;
                }
                catch (Exception ex)
                {
                    PremadeDialogs.GenericError(ex);
                }
            }

            UpdateList();
        }

        private void moveToRegistryToolStripMenuItem_Click(object sender, EventArgs e)
        {
            foreach (var item in Selection.OfType<StartupEntry>())
            {
                try
                {
                    StartupEntryManager.MoveToRegistry(item);
                }
                catch (Exception ex)
                {
                    PremadeDialogs.GenericError(ex);
                }
            }

            UpdateList();
        }

        private void createBackupToolStripMenuItem_Click(object sender, EventArgs e)
        {
            folderBrowserDialog.ShowDialog(this);
            if (!Directory.Exists(folderBrowserDialog.SelectedPath)) return;

            foreach (var item in Selection)
            {
                try
                {
                    item.CreateBackup(folderBrowserDialog.SelectedPath);
                }
                catch (Exception ex)
                {
                    PremadeDialogs.GenericError(ex);
                }
            }

            Process.Start(folderBrowserDialog.SelectedPath);

            UpdateList();
        }

        private void comboBoxFilter_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (AllItems != null)
                UpdateList();
        }
    }
}