using System.Windows.Controls;
using CommunityToolkit.Mvvm.Messaging;
using ExcelHelper.Message;
using ExcelHelper.Views.ViewModels;

namespace ExcelHelper.Views.Pages;

/// <summary>
/// ImportExcelPage.xaml 的交互逻辑
/// </summary>
public partial class ImportExcelPage : Page, IView, IRecipient<UpdateDataGridColumnsMessage>
{
    private readonly ImportViewModel ViewModel;
    public ImportExcelPage(ImportViewModel viewModel)
    {
        InitializeComponent();
        this.DataContext = ViewModel = viewModel;
        ViewModel.IsActive = true;
        // Register a message in some module
        WeakReferenceMessenger.Default.Register<UpdateDataGridColumnsMessage>(this, (r, message) =>
        {
            if (message.Value != null)
            {
                ExcelDataPreviewGrid.Columns.Clear();
                foreach (var column in message.Value)
                {
                    ExcelDataPreviewGrid.Columns.Add(column);
                }
            }
        });
        DropFileMask.Visibility = System.Windows.Visibility.Visible;
    }
    private void Grid_DragEnter(object sender, System.Windows.DragEventArgs e)
    {
        if (e.Data.GetDataPresent(System.Windows.DataFormats.FileDrop))
        {
            e.Effects = System.Windows.DragDropEffects.Link;
        }
        else
        {
            e.Effects = System.Windows.DragDropEffects.None;
        }
        DropFileMask.Visibility = System.Windows.Visibility.Visible;
    }

    private void Grid_Drop(object sender, System.Windows.DragEventArgs e)
    {
        DropFileMask.Visibility = System.Windows.Visibility.Collapsed; 
        if (e.Data.GetDataPresent(System.Windows.DataFormats.FileDrop))
        {
            var files = (string[])e.Data.GetData(System.Windows.DataFormats.FileDrop);
            if (files.Length > 0)
            {
                ViewModel.FileDrop(files);
            }
        }
        
    }

    private void Grid_DragLeave(object sender, System.Windows.DragEventArgs e)
    {
        DropFileMask.Visibility = System.Windows.Visibility.Collapsed; 
    }

    void IRecipient<UpdateDataGridColumnsMessage>.Receive(UpdateDataGridColumnsMessage message)
    {
        if (message.Value != null)
        {
            ExcelDataPreviewGrid.Columns.Clear();
            foreach (var column in message.Value)
            {
                ExcelDataPreviewGrid.Columns.Add(column);
            }
        }
    }
}