using BPA.Models;
using BPA.Helper;
using BPASmartClient.MorkF.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.Imaging;
using System.Windows.Shapes;

namespace BPASmartClient.MorkF.View
{
    /// <summary>
    /// LocalMenu.xaml 的交互逻辑
    /// </summary>
    public partial class LocalMenu : Window
    {

        double X, Y;
        Border ultUE;
        Popup mypopup;
        ListBoxItem OldItem;
        ListBoxItem new_Item;
        bool isDown = false;

        int lao_index;
        int new_index;


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

        public LocalMenu()
        {
            InitializeComponent();
            ActionManage.GetInstance.CancelRegister("LocalMenuClose");
            ActionManage.GetInstance.Register(new Action(() =>
            {
                this.Hide();
            }), "LocalMenuClose");
        }

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

        private int GetCurrentIndex(GetPositionDelegate getPosition)
        {
            int index = -1;
            for (int i = 0; i < listview1.Items.Count; ++i)
            {
                ListBoxItem 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);

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

        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 (sender is ListBox listview && e.LeftButton == MouseButtonState.Pressed && listview.SelectedItem != null)
            {
                var pos = e.GetPosition(listview1);
                HitTestResult result = VisualTreeHelper.HitTest(listview1, pos);
                if (result == null)
                {
                    return;
                }
                var listBoxItem = Utils.FindVisualParent<ListBoxItem>(result.VisualHit);
                if (listBoxItem == null || listBoxItem.Content != listview1.SelectedItem)
                {
                    return;
                }
                DataObject dataObj = new DataObject(listBoxItem.Content as PotActions);
                DragDrop.DoDragDrop(listview1, dataObj, DragDropEffects.Move);
                ActionManage.GetInstance.Send("SortFryTime");
            }


        }

        private void listview1_Drop(object sender, DragEventArgs e)
        {
            var pos = e.GetPosition(listview1);
            var result = VisualTreeHelper.HitTest(listview1, pos);
            if (result == null)
            {
                return;
            }
            //查找元数据
            var sourcePerson = e.Data.GetData(typeof(PotActions)) as PotActions;
            if (sourcePerson == null)
            {
                return;
            }
            //查找目标数据
            var listBoxItem = Utils.FindVisualParent<ListBoxItem>(result.VisualHit);
            if (listBoxItem == null)
            {
                return;
            }
            var targetPerson = listBoxItem.Content as PotActions;
            if (ReferenceEquals(targetPerson, sourcePerson))
            {
                return;
            }
            int i = listview1.Items.IndexOf(sourcePerson);
            int j = listview1.Items.IndexOf(targetPerson);
            ActionManage.GetInstance.Send(new int[] { i, j }, "PotActionStep");
            //LocalMenuViewModel.PotActionStep.RemoveAt(listview1.Items.IndexOf(sourcePerson));
            //LocalMenuViewModel.PotActionStep.Insert(listview1.Items.IndexOf(targetPerson)+1, sourcePerson);
            //targetPerson.FryTime = listview1.Items.IndexOf(targetPerson) -1;
            //LocalMenuViewModel.PotActionStep.Move(listview1.Items.IndexOf(sourcePerson), listview1.Items.IndexOf(targetPerson));


        }

        private void listview1_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {

            ////鼠标未按下返回
            //if (!isDown) return;

            //isDown = false;

            //var pos = e.GetPosition(listview1);
            //HitTestResult result = VisualTreeHelper.HitTest(listview1, pos);
            //if (result == null) return;
            //new_Item = Utils.FindVisualParent<ListBoxItem>(result.VisualHit);
            //if (mypopup != null)
            //{
            //    mypopup.IsOpen = false;
            //    mypopup = null;
            //}

            //MoveListBoxStyle(e, false);


        }

        private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            this.DragMove();
        }

        private void Materials_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            string str = Materials.SelectedValue?.ToString();
            if (str != string.Empty)
            {
                ActionManage.GetInstance.Send("LoacMenuSelectMaterial", str);
            }
        }



        /// <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;
                    //            item.Background = Brushes.AliceBlue;
                    //            lao_index = LocalMenuViewModel.PotActionStep.IndexOf(item.Content as PotActions);
                    //            new_index = LocalMenuViewModel.PotActionStep.IndexOf(ChildListBoxItem.Content as PotActions);
                    //            //LocalMenuViewModel.PotActionStep.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
                {

                    //LocalMenuViewModel.PotActionStep.Move(lao_index, new_index);

                    //移动到某行减轻某行 暗黑
                    foreach (ListBoxItem item in Utils.FindVisualChildren<ListBoxItem>(listview1))
                    {
                        item.Background = Brushes.Transparent;
                        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;
                    }
                }
            }
        }
    }
}