using DTS.Common.Interface.Groups.GroupTemplateList;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using DTS.Common.Controls;
using DTS.Common.Interface.Groups.GroupList;
using DTS.Common.Utils;

// ReSharper disable CheckNamespace

namespace GroupList
{
    /// <inheritdoc cref="IGroupListView" />
    /// <summary>
    /// Interaction logic for GroupListView.xaml
    /// </summary>
    public partial class GroupListView : IGroupListView
    {
        public GroupListView()
        {
            InitializeComponent();
        }

        private void ListViewHeader_Click(object sender, RoutedEventArgs e)
        {
            var colHeader = (GridViewColumnHeader)e.OriginalSource;
            var viewModel = (IGroupListViewModel)colHeader.DataContext;
            viewModel.Sort(colHeader.Tag, true);
        }
        private void GridViewColumnHeaderSearchable_OnSearch(object sender, RoutedEventArgs e)
        {
            var searchTerm = (string)e.OriginalSource;
            var columnTag = (sender as GridViewColumnHeaderSearchable)?.Tag;
            var vm = (IGroupListViewModel)DataContext;
            vm.Filter(columnTag, searchTerm);
        }
        private void GridViewColumnHeader_OnClick(object sender, RoutedEventArgs e)
        {
            var vm = (IGroupListViewModel)DataContext;
            var columnTag = (sender as GridViewColumnHeaderSearchable)?.Tag ?? Utils.FindChild<GridViewColumnHeaderSearchable>((DependencyObject)e.OriginalSource, null)?.Tag;
            vm?.Sort(columnTag, true);
        }
        private void MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            if (!(sender is ListView lv))
            {
                return;
            }
            var index = GetCurrentIndex(e.GetPosition, lv);
            if (index >= 0 && index < lv.Items.Count)
            {
                var vm = (IGroupListViewModel)lv.DataContext;
                vm.MouseDoubleClick(index);
            }
        }

        private delegate Point GetPositionDelegate(IInputElement element);
        private static int GetCurrentIndex(GetPositionDelegate getPosition, ListView lv)
        {
            var index = -1;
            for (var i = 0; i < lv.Items.Count; i++)
            {
                var item = GetListViewItem(i, lv);
                if (item == null)
                    continue;
                if (IsMouseOverTarget(item, getPosition))
                {
                    index = i;
                    break;
                }
            }
            return index;
        }
        private static ListViewItem GetListViewItem(int index, ListView lv)
        {
            return lv.ItemContainerGenerator.ContainerFromIndex(index) as ListViewItem;
        }
        private static bool IsMouseOverTarget(Visual target, GetPositionDelegate getPosition)
        {
            var bounds = VisualTreeHelper.GetDescendantBounds(target);
            var mousePos = getPosition((IInputElement)target);
            return bounds.Contains(mousePos);
        }
    }
}