using BPASmartClient.MilkWithTea.ViewModel;
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.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Effects;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace BPASmartClient.MilkWithTea.View
{
    /// <summary>
    /// RecipeConfige.xaml 的交互逻辑
    /// </summary>
    public partial  class RecipeConfige : Window
    {
        double X,Y;
        Border ultUE;
        Popup mypopup;
        ListBoxItem OldItem;
        bool isDown = false;

        /// <summary>
        /// 当前拖拽子控件Item
        /// </summary>
        private ListBoxItem ChildListBoxItem;

        public RecipeConfige()
        {
            InitializeComponent();
            ActionManage.GetInstance.CancelRegister("RecipeConfigeViewClose");
            ActionManage.GetInstance.Register(new Action(()=> this.Close()), "RecipeConfigeViewClose");
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
            
           
        }

       

       

        

        private int GetCurrentIndex(GetPositionDelegate getPosition)
        {
            int index = -1;
            for (int i = 0; i < listview1.Items.Count; ++i)
            {
                ListViewItem item = GetListViewItem(i);
                if (item != null && this.IsMouseOverTarget(item, getPosition))
                {
                    index = i;
                    break;
                }
            }
            return index;
        }

        private bool IsMouseOverTarget(Visual target, GetPositionDelegate getPosition)
        {
            Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
             Point mousePos = getPosition((IInputElement)target);
            return bounds.Contains(mousePos);
        }

        
        delegate Point GetPositionDelegate(IInputElement element);

        ListViewItem GetListViewItem(int index)
        {
            if (listview1.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)
                return null;
            return listview1.ItemContainerGenerator.ContainerFromIndex(index) as ListViewItem;
        }

        private void CloneVisual(Border border, MouseButtonEventArgs e)
        {
            ListBoxItem listBoxItem = new ListBoxItem();
            Point ptLeftUp = new Point(0, 0);
            ptLeftUp = listview1.PointToScreen(ptLeftUp);
            mypopup = new Popup();
            double y = e.GetPosition(listview1).Y;
            double x = e.GetPosition(listview1).X;
 
            VisualBrush brush = new VisualBrush(border);
            Rectangle rect = new Rectangle();
            rect.Width = border.ActualWidth;
            rect.Height = border.ActualHeight;
            rect.Fill = brush;
            rect.Opacity = border.Opacity;
            border.Opacity = 0.8;
            mypopup.Child = rect;
            mypopup.AllowsTransparency = true;
            mypopup.HorizontalOffset = ptLeftUp.X + x - ((FrameworkElement)ultUE).ActualWidth / 2;
            mypopup.VerticalOffset = ptLeftUp.Y + y - ((FrameworkElement)ultUE).ActualHeight / 2;
            mypopup.IsOpen = true;
        }

        private void listview1_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            try
            {
                if (isDown)
                {
                    isDown = false;
                    return;
                }
                var pos = e.GetPosition(listview1);
                HitTestResult result = VisualTreeHelper.HitTest(listview1, pos);
                if (result == null) return;
                OldItem = Utils.FindVisualParent<ListBoxItem>(result.VisualHit);
                if (OldItem != null)
                {
                    if (e.Source is Border)
                    {
                        ultUE = (Border)e.Source;
                        ultUE.CaptureMouse();
                        ChildListBoxItem = Utils.FindVisualParent<ListBoxItem>(VisualTreeHelper.HitTest(ultUE, e.GetPosition(ultUE)).VisualHit);
                        CloneVisual(ultUE, e);
                        isDown = true;
                    }
                }
            }
            catch (Exception)
            {

                throw;
            } 
        }



        private void listview1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDown == false) return;
            if (e.LeftButton != MouseButtonState.Pressed)
                listview1_MouseLeftButtonUp(null,null);
                Point ptLeftUp = new Point(0, 0);
                Point ptRightDown = new Point(this.ActualWidth, this.ActualHeight);
                ptLeftUp = listview1.PointToScreen(ptLeftUp);
                ptRightDown = listview1.PointToScreen(ptRightDown);
                double y = e.GetPosition(listview1).Y;
                double x = e.GetPosition(listview1).X;
                if (mypopup != null)
                {
                    mypopup.HorizontalOffset = ptLeftUp.X + x - ((FrameworkElement)ultUE).ActualWidth / 2;
                    mypopup.VerticalOffset = ptLeftUp.Y + y - ((FrameworkElement)ultUE).ActualHeight / 2;
                }
                MoveListBoxStyle(e, true);
            
           
        }

        private void listview1_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            //鼠标未按下返回
            if (!isDown) return;

            isDown = false;
            if (mypopup != null)
            {
                mypopup.IsOpen = false;
                mypopup = null;
            }

            MoveListBoxStyle(e, false);
            //if (OldItem == null) return;
            //var pos = e.GetPosition(listview1);
            //HitTestResult result = VisualTreeHelper.HitTest(listview1, pos);
            //if(result == null) return;
            //var Newitem = Utils.FindVisualParent<ListBoxItem>(result.VisualHit);
            //if (Newitem == null) return;
            //if (OldItem == Newitem) return;
            //int iold = listview1.Items.IndexOf((LocalMaterail)OldItem.DataContext);
            //int inew = listview1.Items.IndexOf((LocalMaterail)Newitem.DataContext);
            //RecipeConfigeViewModel.Materails.Move(iold,inew);
            
        }

        /// <summary>
        /// 移动效果
        /// </summary>
        /// <param name="boxItem"></param>
        private void MoveListBoxStyle(MouseEventArgs e, bool isBool)
        {
            try
            {
                if (isBool)//为真，根据鼠标位置设置行透明度和显示状态
                {
                    //移动到某行减轻某行 暗黑
                    foreach (ListBoxItem item in Utils.FindVisualChildren<ListBoxItem>(listview1))
                    {
                        if (item != ChildListBoxItem)//这就是其他控件
                        {
                            double item_width = item.ActualWidth;   //当前行宽
                            double item_height = item.ActualHeight; //当前行高
                            double item_x = e.GetPosition(item).X;  //鼠标相对当前行X位移
                            double item_y = e.GetPosition(item).Y;  //鼠标相对当前行Y位移

                            if (item_y <= item_height && item_y > 0 && item_x > 0 && item_x <= item_width)//鼠标进入哪一行,则将那一行变灰
                            {
                                item.Opacity = 0.5;
                                int lao_index = RecipeConfigeViewModel.Materails.IndexOf(item.Content as LocalMaterail);
                                int new_index = RecipeConfigeViewModel.Materails.IndexOf(ChildListBoxItem.Content as LocalMaterail);
                                RecipeConfigeViewModel.Materails.Move(lao_index, new_index);
                            }
                            else //鼠标没在哪一行，则保持原状
                            {
                                item.Opacity = 1;
                            }
                        }
                        else
                        {
                            item.Visibility = Visibility.Hidden;
                        }
                    }
                }
                else//为假 恢复所有行透明度和显示状态
                {
                    //移动到某行减轻某行 暗黑
                    foreach (ListBoxItem item in Utils.FindVisualChildren<ListBoxItem>(listview1))
                    {
                        item.Opacity = 1;
                        item.Visibility = Visibility.Visible;
                    }
                }
            }
            catch (Exception ex)
            {
            }
        }
    }



    internal static class Utils
    {
        //根据子元素查找父元素
        public static T FindVisualParent<T>(DependencyObject obj) where T : class
        {
            while (obj != null)
            {
                if (obj is T)
                    return obj as T;

                obj = VisualTreeHelper.GetParent(obj);
            }
            return null;
        }

        /// <summary>
        /// 查询子控件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
        {
            if (depObj != null)
            {
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                    if (child != null && child is T)
                    {
                        yield return (T)child;
                    }

                    foreach (T childOfChild in FindVisualChildren<T>(child))
                    {
                        yield return childOfChild;
                    }
                }
            }
        }
    }
}