// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
#nullable disable
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using Microsoft.VisualStudio.LanguageServices.Implementation.Utilities;
using Microsoft.VisualStudio.LanguageServices.Utilities;
using Microsoft.VisualStudio.PlatformUI;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.PickMembers;
 
/// <summary>
/// Interaction logic for ExtractInterfaceDialog.xaml
/// </summary>
internal partial class PickMembersDialog : DialogWindow
{
    private readonly PickMembersDialogViewModel _viewModel;
 
    // Expose localized strings for binding
    public string PickMembersDialogTitle => ServicesVSResources.Pick_members;
    public string PickMembersTitle { get; }
 
    public string SelectAll => ServicesVSResources.Select_All;
    public string DeselectAll => ServicesVSResources.Deselect_All;
    public string OK => ServicesVSResources.OK;
    public string Cancel => ServicesVSResources.Cancel;
 
    internal PickMembersDialog(PickMembersDialogViewModel viewModel, string title)
    {
        PickMembersTitle = title;
        _viewModel = viewModel;
        SetCommandBindings();
 
        InitializeComponent();
        DataContext = viewModel;
    }
 
    private void SetCommandBindings()
    {
        CommandBindings.Add(new CommandBinding(
            new RoutedCommand(
                "SelectAllClickCommand",
                typeof(PickMembersDialog),
                new InputGestureCollection(new List<InputGesture> { new KeyGesture(Key.S, ModifierKeys.Alt) })),
            Select_All_Click));
 
        CommandBindings.Add(new CommandBinding(
            new RoutedCommand(
                "DeselectAllClickCommand",
                typeof(PickMembersDialog),
                new InputGestureCollection(new List<InputGesture> { new KeyGesture(Key.D, ModifierKeys.Alt) })),
            Deselect_All_Click));
    }
 
    private void SearchTextBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        _viewModel.Filter(SearchTextBox.Text);
        Members.Items.Refresh();
    }
 
    private void OK_Click(object sender, RoutedEventArgs e)
        => DialogResult = true;
 
    private void Cancel_Click(object sender, RoutedEventArgs e)
        => DialogResult = false;
 
    private void Select_All_Click(object sender, RoutedEventArgs e)
        => _viewModel.SelectAll();
 
    private void Deselect_All_Click(object sender, RoutedEventArgs e)
        => _viewModel.DeselectAll();
 
    private void MoveUp_Click(object sender, EventArgs e)
    {
        var oldSelectedIndex = Members.SelectedIndex;
        if (_viewModel.CanMoveUp && oldSelectedIndex >= 0)
        {
            _viewModel.MoveUp();
            Members.Items.Refresh();
            Members.SelectedIndex = oldSelectedIndex - 1;
        }
 
        SetFocusToSelectedRow();
    }
 
    private void MoveDown_Click(object sender, EventArgs e)
    {
        var oldSelectedIndex = Members.SelectedIndex;
        if (_viewModel.CanMoveDown && oldSelectedIndex >= 0)
        {
            _viewModel.MoveDown();
            Members.Items.Refresh();
            Members.SelectedIndex = oldSelectedIndex + 1;
        }
 
        SetFocusToSelectedRow();
    }
 
    private void SetFocusToSelectedRow()
    {
        if (Members.SelectedIndex >= 0)
        {
            if (Members.ItemContainerGenerator.ContainerFromIndex(Members.SelectedIndex) is not ListViewItem row)
            {
                Members.ScrollIntoView(Members.SelectedItem);
                row = Members.ItemContainerGenerator.ContainerFromIndex(Members.SelectedIndex) as ListViewItem;
            }
 
            row?.Focus();
        }
    }
 
    private void OnListViewPreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Space && e.KeyboardDevice.Modifiers == ModifierKeys.None)
        {
            ToggleCheckSelection();
            e.Handled = true;
        }
    }
 
    private void OnListViewDoubleClick(object sender, MouseButtonEventArgs e)
    {
        if (e.ChangedButton == MouseButton.Left)
        {
            ToggleCheckSelection();
            e.Handled = true;
        }
    }
 
    private void ToggleCheckSelection()
    {
        var selectedItems = Members.SelectedItems.OfType<MemberSymbolViewModel>().ToArray();
        var allChecked = selectedItems.All(m => m.IsChecked);
        foreach (var item in selectedItems)
        {
            item.IsChecked = !allChecked;
        }
    }
 
    internal TestAccessor GetTestAccessor()
        => new(this);
 
    internal readonly struct TestAccessor
    {
        private readonly PickMembersDialog _dialog;
 
        public TestAccessor(PickMembersDialog dialog)
            => _dialog = dialog;
 
        public Button OKButton => _dialog.OKButton;
 
        public Button CancelButton => _dialog.CancelButton;
 
        public Button UpButton => _dialog.UpButton;
 
        public Button DownButton => _dialog.DownButton;
 
        public AutomationDelegatingListView Members => _dialog.Members;
    }
}