using Microsoft.WindowsAPICodePack.Controls;
using Microsoft.WindowsAPICodePack.Shell;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace Tango.FSE.UI.Storage
{
    /// <summary>
    /// Interaction logic for ExplorerControlWindow.xaml
    /// </summary>
    public partial class ExplorerControlDialog : Window
    {
        private static string _lastDirectory;
        private static Point? _lastLocation;

        private string _currentLocation;

        public List<String> SelectedItems { get; set; }
        public String InitialDirectory { get; set; }

        public ObservableCollection<ShellObject> ShellHistory
        {
            get { return (ObservableCollection<ShellObject>)GetValue(ShellHistoryProperty); }
            set { SetValue(ShellHistoryProperty, value); }
        }
        public static readonly DependencyProperty ShellHistoryProperty =
            DependencyProperty.Register("ShellHistory", typeof(ObservableCollection<ShellObject>), typeof(ExplorerControlDialog), new PropertyMetadata(null));

        public ExplorerControlDialog()
        {
            SelectedItems = new List<string>();
            ShellHistory = new ObservableCollection<ShellObject>();

            InitializeComponent();
            Loaded += ExplorerControlWindow_Loaded;
            SourceInitialized += ExplorerControlWindow_SourceInitialized;
            explorer.browser.SelectionChanged += Browser_SelectionChanged;
            explorer.browser.NavigationComplete += Browser_NavigationComplete;
            btnSelect.IsEnabled = false;
            btnBack.IsEnabled = false;
            btnForward.IsEnabled = false;

            if (_lastLocation != null)
            {
                WindowStartupLocation = WindowStartupLocation.Manual;
                Left = _lastLocation.Value.X;
                Top = _lastLocation.Value.Y;
            }
            else
            {
                WindowStartupLocation = WindowStartupLocation.CenterOwner;
            }
        }

        private void FillShellHistory(ShellObject current)
        {
            ShellHistory.Clear();

            ShellObject parent = current;

            while (parent != null)
            {
                ShellHistory.Insert(0, parent);

                if (parent.ToString() == "This PC") break;

                parent = parent.Parent;
            }
        }

        private void Browser_NavigationComplete(object sender, Microsoft.WindowsAPICodePack.Controls.NavigationCompleteEventArgs e)
        {
            _currentLocation = e.NewLocation.ParsingName;
            ShellObject shell = ShellObject.FromParsingName(_currentLocation);

            if (shell.ToString() != "This PC")
            {
                btnUp.IsEnabled = true;
                txtLocation.Text = shell.GetDisplayName(DisplayNameType.FileSystemPath);
            }
            else
            {
                btnUp.IsEnabled = false;
                txtLocation.Text = "";
            }

            FillShellHistory(shell);

            btnBack.IsEnabled = explorer.browser.NavigationLog.CanNavigateBackward;
            btnForward.IsEnabled = explorer.browser.NavigationLog.CanNavigateForward;
        }

        private void Browser_SelectionChanged(object sender, EventArgs e)
        {
            if (explorer.browser.SelectedItems.OfType<ShellObject>().ToList().Count > 0)
            {
                btnSelect.IsEnabled = true;
            }
            else
            {
                btnSelect.IsEnabled = false;
            }
        }

        private void ExplorerControlWindow_SourceInitialized(object sender, EventArgs e)
        {
            this.HideMinimizeAndMaximizeButtons();
        }

        private void ExplorerControlWindow_Loaded(object sender, RoutedEventArgs e)
        {
            ShellObject initialShellObject = (ShellObject)KnownFolders.Desktop;

            if (InitialDirectory != null && Directory.Exists(InitialDirectory))
            {
                initialShellObject = ShellObject.FromParsingName(InitialDirectory);
            }
            else if (_lastDirectory != null && Directory.Exists(_lastDirectory))
            {
                initialShellObject = ShellObject.FromParsingName(_lastDirectory);
            }

            explorer.browser.Navigate(initialShellObject);
        }

        private void BtnSelect_Click(object sender, RoutedEventArgs e)
        {
            SelectedItems.Clear();

            foreach (var item in explorer.browser.SelectedItems.OfType<ShellObject>())
            {
                SelectedItems.Add(item.ParsingName);
            }

            _lastDirectory = _currentLocation;
            _lastLocation = new Point(Left, Top);


            DialogResult = true;
            Close();
        }

        private void BtnCancel_Click(object sender, RoutedEventArgs e)
        {
            _lastLocation = new Point(Left, Top);
            Close();
        }

        private void BtnBack_Click(object sender, RoutedEventArgs e)
        {
            explorer.browser.NavigateLogLocation(NavigationLogDirection.Backward);
        }

        private void BtnForward_Click(object sender, RoutedEventArgs e)
        {
            explorer.browser.NavigateLogLocation(NavigationLogDirection.Forward);
        }

        private void BtnUp_Click(object sender, RoutedEventArgs e)
        {
            ShellObject currentLocation = ShellObject.FromParsingName(_currentLocation);
            explorer.browser.Navigate(currentLocation.Parent);
        }

        private void TxtLocation_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            listHistory.Visibility = Visibility.Collapsed;
        }

        private void TxtLocation_LostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            listHistory.Visibility = Visibility.Visible;
        }

        private void OnHistoryItemClicked(object sender, RoutedEventArgs e)
        {
            ShellObject shell = (sender as Button).DataContext as ShellObject;
            explorer.browser.Navigate(shell);
        }
    }

    internal static class WindowExtensions
    {
        // from winuser.h
        private const int GWL_STYLE = -16,
                          WS_MAXIMIZEBOX = 0x10000,
                          WS_MINIMIZEBOX = 0x20000;

        [DllImport("user32.dll")]
        extern private static int GetWindowLong(IntPtr hwnd, int index);

        [DllImport("user32.dll")]
        extern private static int SetWindowLong(IntPtr hwnd, int index, int value);

        internal static void HideMinimizeAndMaximizeButtons(this Window window)
        {
            IntPtr hwnd = new System.Windows.Interop.WindowInteropHelper(window).Handle;
            var currentStyle = GetWindowLong(hwnd, GWL_STYLE);

            SetWindowLong(hwnd, GWL_STYLE, (currentStyle & ~WS_MAXIMIZEBOX & ~WS_MINIMIZEBOX));
        }
    }
}