using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Tango.MachineStudio.RML.ViewModels;
using Tango.BL.Entities;
using Tango.DragAndDrop;

namespace Tango.MachineStudio.RML.Views
{
    /// <summary>
    /// Interaction logic for ProcessParametersView.xaml
    /// </summary>
    public partial class ProcessParametersView : UserControl
    {
        private HashSet<ScrollViewer> _processTablesViewers;

        private MainViewVM _vm;
        public DraggingSurface DraggingSurface
        {
            get { return (DraggingSurface)GetValue(DraggingSurfaceProperty); }
            set { SetValue(DraggingSurfaceProperty, value); }
        }
        public static readonly DependencyProperty DraggingSurfaceProperty =
            DependencyProperty.Register("DraggingSurface", typeof(DraggingSurface), typeof(ProcessParametersView), new PropertyMetadata(null));
        
        public double WidthLilquidFactors
        {
            get { return (double )GetValue(WidthLilquidFactorsProperty); }
            set { SetValue(WidthLilquidFactorsProperty, value); }
        }

        // Using a DependencyProperty as the backing store for WidthLilquidFactors.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty WidthLilquidFactorsProperty =
            DependencyProperty.Register("WidthLilquidFactors", typeof(double ), typeof(ProcessParametersView), new PropertyMetadata(null));

        
        public ProcessParametersView()
        {
            InitializeComponent();
            _processTablesViewers = new HashSet<ScrollViewer>();
            DraggingSurface = draggingSurface;
            Loaded += (_, __) => { _vm = DataContext as MainViewVM; };
        }
        private void OnProcessTableDropped(object sender, DropEventArgs e)
        {
            ProcessParametersTable dragged = e.Draggable.DataContext as ProcessParametersTable;
            ProcessParametersTable dropped = e.Droppable.DataContext as ProcessParametersTable;
            _vm.OnProcessParametersTableDropped(dragged, dropped);
        }

        private void ScrollViewer_Loaded(object sender, RoutedEventArgs e)
        {
            var viewer = sender as ScrollViewer;
            if (!_processTablesViewers.Contains(viewer))
            {
                viewer.ScrollChanged += Viewer_ScrollChanged;
                _processTablesViewers.Add(viewer);
            }
        }

        private void Viewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
        {
            foreach (var viewer in _processTablesViewers.Where(x => x.IsLoaded && x.IsVisible && x != sender).ToList())
            {
                viewer.ScrollToVerticalOffset(e.VerticalOffset);
            }
        }
    }
}