using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Threading;
using CommunityToolkit.Mvvm.Messaging;
using Seyounth.Hyosung.UI.ViewModels.Pages;

namespace Seyounth.Hyosung.UI.Views.Pages;

public partial class PalletManagementPage : Page
{
    public PalletManagementViewModel ViewModel { get; }

    public PalletManagementPage(PalletManagementViewModel 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
            PalletsDataGrid.CommitEdit();
            PalletsDataGrid.CancelEdit();
        });
    }

    private void PalletsDataGrid_AddingNewItem(object sender, AddingNewItemEventArgs e)
    {
        // 确保新项已添加到集合
        Dispatcher.BeginInvoke(new Action(() =>
        {
            if (PalletsDataGrid.Items.Count == 0) return;

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

            if (PalletsDataGrid.ItemContainerGenerator.ContainerFromIndex(lastIndex) is not DataGridRow row) return;
            row.Focus();
            PalletsDataGrid.CurrentColumn = PalletsDataGrid.Columns[0];
            PalletsDataGrid.BeginEdit();
        }), DispatcherPriority.ContextIdle);
    }

    // private void PalletDataGrid_RowEditEnding(object? sender, DataGridRowEditEndingEventArgs e)
    // {
    //     if (e.EditAction != DataGridEditAction.Commit) return;
    //     var dataGrid = (DataGrid)sender;
    //     dataGrid.CommitEdit(DataGridEditingUnit.Row, true);
    // }

    private void PalletDataGrid_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;
    }
}