using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using Avalonia.Media;
using System;
using System.Composition;

namespace RoslynPad.Roslyn.LanguageServices.ChangeSignature
{
    /// <summary>
    /// Interaction logic for ChangeSignatureDialog.xaml
    /// </summary>
    [Export(typeof(IChangeSignatureDialog))]
    internal partial class ChangeSignatureDialog : Window, IChangeSignatureDialog
    {
        private ChangeSignatureDialogViewModel? _viewModel;

        // Expose localized strings for binding
        public string ChangeSignatureDialogTitle => "Change Signature";
        public string Parameters => "Parameters";
        public string PreviewMethodSignature => "Preview Method Signature";
        public string PreviewReferenceChanges => "PreviewReferenceChanges";
        public string Remove => "Remove";
        public string Restore => "Restore";
        public string OK => "OK";
        public string Cancel => "Cancel";

        public IBrush? ParameterText { get; }
        public IBrush? RemovedParameterText { get; }
        public IBrush? DisabledParameterForeground { get; }
        public IBrush? DisabledParameterBackground { get; }
        public IBrush? StrikethroughBrush { get; }

        // Use C# Reorder Parameters helpTopic for C# and VB.
        public ChangeSignatureDialog()
        {
            AvaloniaXamlLoader.Load(this);

            // Set these headers explicitly because binding to DataGridTextColumn.Header is not
            // supported.
            //modifierHeader.Header = "Modifier";
            //defaultHeader.Header = "Default";
            //typeHeader.Header = "Type";
            //parameterHeader.Header = "Parameter";

            //ParameterText = SystemParameters.HighContrast ? SystemColors.WindowTextBrush : new SolidColorBrush(Color.FromArgb(0xFF, 0x1E, 0x1E, 0x1E));
            //RemovedParameterText = SystemParameters.HighContrast ? SystemColors.WindowTextBrush : new SolidColorBrush(Colors.Gray);
            //DisabledParameterBackground = SystemParameters.HighContrast ? SystemColors.WindowBrush : new SolidColorBrush(Color.FromArgb(0xFF, 0xDF, 0xE7, 0xF3));
            //DisabledParameterForeground = SystemParameters.HighContrast ? SystemColors.GrayTextBrush : new SolidColorBrush(Color.FromArgb(0xFF, 0xA2, 0xA4, 0xA5));
            //Members.Background = SystemParameters.HighContrast ? SystemColors.WindowBrush : new SolidColorBrush(Color.FromArgb(0xFF, 0xFF, 0xFF, 0xFF));
            //StrikethroughBrush = SystemParameters.HighContrast ? SystemColors.WindowTextBrush : new SolidColorBrush(Colors.Red);

            //Loaded += ChangeSignatureDialog_Loaded;
            //IsVisibleChanged += ChangeSignatureDialog_IsVisibleChanged;
        }

        //private void ChangeSignatureDialog_Loaded(object sender, RoutedEventArgs e)
        //{
        //    Members.Focus();
        //}

        //private void ChangeSignatureDialog_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        //{
        //    if ((bool)e.NewValue)
        //    {
        //        IsVisibleChanged -= ChangeSignatureDialog_IsVisibleChanged;
        //    }
        //}

        //private void OK_Click(object sender, RoutedEventArgs e)
        //{
        //    if (_viewModel.TrySubmit())
        //    {
        //        DialogResult = true;
        //    }
        //}

        //private void Cancel_Click(object sender, RoutedEventArgs e)
        //{
        //    DialogResult = false;
        //}

        //private void MoveUp_Click(object sender, EventArgs e)
        //{
        //    int 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)
        //{
        //    int oldSelectedIndex = Members.SelectedIndex;
        //    if (_viewModel.CanMoveDown && oldSelectedIndex >= 0)
        //    {
        //        _viewModel.MoveDown();
        //        Members.Items.Refresh();
        //        Members.SelectedIndex = oldSelectedIndex + 1;
        //    }

        //    SetFocusToSelectedRow();
        //}

        //private void Remove_Click(object sender, RoutedEventArgs e)
        //{
        //    if (_viewModel.CanRemove)
        //    {
        //        _viewModel.Remove();
        //        Members.Items.Refresh();
        //    }

        //    SetFocusToSelectedRow();
        //}

        //private void Restore_Click(object sender, RoutedEventArgs e)
        //{
        //    if (_viewModel.CanRestore)
        //    {
        //        _viewModel.Restore();
        //        Members.Items.Refresh();
        //    }

        //    SetFocusToSelectedRow();
        //}

        //private void SetFocusToSelectedRow()
        //{
        //    if (Members.SelectedIndex >= 0)
        //    {
        //        DataGridRow row = Members.ItemContainerGenerator.ContainerFromIndex(Members.SelectedIndex) as DataGridRow;
        //        if (row == null)
        //        {
        //            Members.ScrollIntoView(Members.SelectedItem);
        //            row = Members.ItemContainerGenerator.ContainerFromIndex(Members.SelectedIndex) as DataGridRow;
        //        }

        //        if (row != null)
        //        {
        //            FocusRow(row);
        //        }
        //    }
        //}

        //private void FocusRow(DataGridRow row)
        //{
        //    // TODO
        //    //DataGridCell cell = row.FindDescendant<DataGridCell>();
        //    //if (cell != null)
        //    //{
        //    //    cell.Focus();
        //    //}
        //}

        //private void MoveSelectionUp_Click(object sender, EventArgs e)
        //{
        //    int oldSelectedIndex = Members.SelectedIndex;
        //    if (oldSelectedIndex > 0)
        //    {
        //        var potentialNewSelectedParameter = Members.Items[oldSelectedIndex - 1] as ChangeSignatureDialogViewModel.ParameterViewModel;
        //        if (!potentialNewSelectedParameter.IsDisabled)
        //        {
        //            Members.SelectedIndex = oldSelectedIndex - 1;
        //        }
        //    }

        //    SetFocusToSelectedRow();
        //}

        //private void MoveSelectionDown_Click(object sender, EventArgs e)
        //{
        //    int oldSelectedIndex = Members.SelectedIndex;
        //    if (oldSelectedIndex >= 0 && oldSelectedIndex < Members.Items.Count - 1)
        //    {
        //        Members.SelectedIndex = oldSelectedIndex + 1;
        //    }

        //    SetFocusToSelectedRow();
        //}

        //private void Members_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        //{
        //    if (Members.SelectedIndex == -1)
        //    {
        //        Members.SelectedIndex = _viewModel.GetStartingSelectionIndex();
        //    }

        //    SetFocusToSelectedRow();
        //}

        //private void ToggleRemovedState(object sender, ExecutedRoutedEventArgs e)
        //{
        //    if (_viewModel.CanRemove)
        //    {
        //        _viewModel.Remove();
        //    }
        //    else if (_viewModel.CanRestore)
        //    {
        //        _viewModel.Restore();
        //    }

        //    Members.Items.Refresh();
        //    SetFocusToSelectedRow();
        //}

        public object ViewModel
        {
            get => DataContext ?? throw new InvalidOperationException("DataContext is null");
            set
            {
                DataContext = value;
                _viewModel = (ChangeSignatureDialogViewModel)value;
            }
        }

        bool? IRoslynDialog.Show()
        {
            //this.SetOwnerToActive();
            //return ShowDialog();
            return false;
        }
    }
}
