using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Threading;
using CommunityToolkit.Mvvm.Messaging;
using Seyounth.Hyosung.UI.ViewModels.Pages;
using Wpf.Ui.Controls;
using DataGrid = System.Windows.Controls.DataGrid;
using TextBox = System.Windows.Controls.TextBox;

namespace Seyounth.Hyosung.UI.Views.Pages
{
    public partial class DataPage : INavigableView<DataViewModel>
    {
        public DataViewModel ViewModel { get; }

        public DataPage(DataViewModel viewModel)
        {
            ViewModel = viewModel;
            DataContext = this;

            InitializeComponent();
            WeakReferenceMessenger.Default.Register<PalletManagementViewModel.SavePalletCompletedMessage>(this, (r, m) =>
            {
                // 提交当前编辑并取消编辑模式
                VarietyDataGrid.CommitEdit();
                VarietyDataGrid.CancelEdit();
            });
        }

        private void VarietyDataGrid_AddingNewItem(object? sender, AddingNewItemEventArgs e)
        {
            Dispatcher.BeginInvoke(new Action(() =>
            {
                if (VarietyDataGrid.Items.Count == 0) return;

                var lastIndex = VarietyDataGrid.Items.Count - 1;
                VarietyDataGrid.ScrollIntoView(VarietyDataGrid.Items[lastIndex]);
                VarietyDataGrid.SelectedIndex = lastIndex;

                if (VarietyDataGrid.ItemContainerGenerator.ContainerFromIndex(lastIndex) is not DataGridRow row) return;
                row.Focus();
                VarietyDataGrid.CurrentColumn = VarietyDataGrid.Columns[0];
                VarietyDataGrid.BeginEdit();
            }), DispatcherPriority.ContextIdle);
        }
        
        private void VarietyDataGrid_CellEditEnding(object? sender, DataGridCellEditEndingEventArgs e)
        {
            if (e.EditAction == DataGridEditAction.Commit)
            {
                var binding = e.EditingElement.GetBindingExpression(TextBox.TextProperty);
                binding?.UpdateSource();
            }
        }

        private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (sender is ComboBox comboBox)
            {
                // 获取所在DataGrid行
                var dataGridRow = FindVisualParent<DataGridRow>(comboBox);
                var dataGrid = FindVisualParent<DataGrid>(comboBox);
                if (dataGrid != null && dataGridRow != null && !dataGridRow.IsEditing)
                {
                    dataGrid.CurrentItem = dataGridRow.Item;
                    dataGrid.BeginEdit();
                }
            }
        }
    
        private static T FindVisualParent<T>(DependencyObject child) where T : DependencyObject
        {
            while (child != null && child is not T)
            {
                child = VisualTreeHelper.GetParent(child);
            }
            return child as T;
        }
    }
}