using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using YY.Admin.ViewModels.RubberQuickTest;

namespace YY.Admin.Views.RubberQuickTest;

public partial class RubberQuickTestOperationView : UserControl
{
    private RubberQuickTestOperationViewModel? _vm;

    public RubberQuickTestOperationView()
    {
        InitializeComponent();
        Loaded += OnLoaded;
        DataContextChanged += OnDataContextChanged;
        Unloaded += (_, _) => DetachViewModel();
    }

    private void OnLoaded(object sender, RoutedEventArgs e)
    {
        // 兜底：AutoWireViewModel 可能在构造函数订阅 DataContextChanged 之前就设置了 DataContext
        AttachViewModel(DataContext as RubberQuickTestOperationViewModel);
    }

    private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        DetachViewModel();
        AttachViewModel(DataContext as RubberQuickTestOperationViewModel);
    }

    private void AttachViewModel(RubberQuickTestOperationViewModel? vm)
    {
        if (vm == null || ReferenceEquals(_vm, vm)) return;

        _vm = vm;
        _vm.InspectColumnsChanged += RebuildInspectColumns;
        _vm.DataPointColumns.CollectionChanged += OnDataPointColumnsChanged;
        RebuildInspectColumns();
    }

    private void DetachViewModel()
    {
        if (_vm == null) return;
        _vm.InspectColumnsChanged -= RebuildInspectColumns;
        _vm.DataPointColumns.CollectionChanged -= OnDataPointColumnsChanged;
        _vm = null;
    }

    private void OnDataPointColumnsChanged(object? sender, NotifyCollectionChangedEventArgs e)
        => RebuildInspectColumns();

    private void RebuildInspectColumns()
    {
        if (!Dispatcher.CheckAccess())
        {
            Dispatcher.Invoke(RebuildInspectColumns);
            return;
        }

        var vm = _vm ?? DataContext as RubberQuickTestOperationViewModel;
        if (vm == null) return;

        InspectResultGrid.Columns.Clear();

        InspectResultGrid.Columns.Add(new DataGridTextColumn
        {
            Header = "编号",
            Binding = new Binding(nameof(QuickTestInspectRowViewModel.RowNo))
            {
                Mode = BindingMode.OneWay
            },
            IsReadOnly = true,
            Width = 80
        });

        for (int i = 0; i < vm.DataPointColumns.Count; i++)
        {
            var col = vm.DataPointColumns[i];
            var columnIndex = i;
            var header = string.IsNullOrWhiteSpace(col.PointName)
                ? $"数据点{columnIndex + 1}"
                : col.PointName;

            InspectResultGrid.Columns.Add(new DataGridTextColumn
            {
                Header = header,
                Binding = new Binding($"Cells[{columnIndex}].Value")
                {
                    UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
                    Mode = BindingMode.TwoWay,
                    TargetNullValue = string.Empty
                },
                Width = 100,
                IsReadOnly = false
            });
        }

        InspectResultGrid.Columns.Add(new DataGridTextColumn
        {
            Header = "实验结果",
            Binding = new Binding(nameof(QuickTestInspectRowViewModel.InspectResultText))
            {
                Mode = BindingMode.OneWay
            },
            IsReadOnly = true,
            Width = 90
        });
    }

    private void InspectResultGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        var vm = _vm ?? DataContext as RubberQuickTestOperationViewModel;
        if (vm == null) return;
        vm.SelectedInspectRow = InspectResultGrid.SelectedItem as QuickTestInspectRowViewModel;
    }
}