using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

using Wpf.Ui.Extend.Models;

namespace Wpf.Ui.Extend.UserControls
{
    public partial class MultiCheckTreeView : UserControl
    {
        /// <summary>
        ///     构造
        /// </summary>
        public MultiCheckTreeView()
        {
            InitializeComponent();
        }

        /// <summary>
        ///     控件数据
        /// </summary>
        private IList<TreeModel> itemsSourceData;

        /// <summary>
        ///     控件数据
        /// </summary>
        public IList<TreeModel> ItemsSourceData
        {
            get => itemsSourceData;
            set
            {
                itemsSourceData = value;
                MultiCheckTree.ItemsSource = itemsSourceData;
            }
        }

        /// <summary>
        ///     获取选中所有项（父节点和子节点）
        /// </summary>
        /// <returns></returns>
        public IList<TreeModel> CheckedItemsIgnoreRelation()
        {
            return GetCheckedItemsIgnoreRelation(itemsSourceData);
        }

        /// <summary>
        ///     设置对应Id的项为选中状态
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public int SetCheckedById(string id, IList<TreeModel> treeList)
        {
            foreach (var tree in treeList)
            {
                if (tree.Id.Equals(id))
                {
                    tree.IsChecked = true;
                    return 1;
                }

                if (SetCheckedById(id, tree.Children) == 1)
                {
                    return 1;
                }
            }

            return 0;
        }

        /// <summary>
        ///     设置对应Id的项为选中状态
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public int SetCheckedById(string id)
        {
            foreach (var tree in ItemsSourceData)
            {
                if (tree.Id.Equals(id))
                {
                    tree.IsChecked = true;
                    return 1;
                }

                if (SetCheckedById(id, tree.Children) == 1)
                {
                    return 1;
                }
            }

            return 0;
        }

        /// <summary>
        ///     私有方法，忽略层次关系的情况下，获取选中项
        /// </summary>
        /// <param name="list"></param>
        /// <returns></returns>
        private IList<TreeModel> GetCheckedItemsIgnoreRelation(IList<TreeModel> list)
        {
            IList<TreeModel> treeList = [];
            foreach (var tree in list)
            {
                if (tree.IsChecked == true)
                {
                    treeList.Add(tree);
                }

                //第二次调用方法时由于没有子节点即为空，所以不进行执行下面语句，跳出下面的foreach语句
                foreach (var child in GetCheckedItemsIgnoreRelation(tree.Children))
                {
                    treeList.Add(child);
                }
            }

            return treeList;
        }

        private static DependencyObject VisualUpwardSearch<T>(DependencyObject source)
        {
            while (source != null && source.GetType() != typeof(T))
                source = VisualTreeHelper.GetParent(source);

            return source;
        }

        /// <summary>
        ///     全部展开菜单事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuExpandAll_Click(object sender, RoutedEventArgs e)
        {
            if (MultiCheckTree.ItemsSource != null)
            {
                foreach (TreeModel tree in MultiCheckTree.ItemsSource)
                {
                    tree.IsExpanded = true;
                    tree.SetChildrenExpanded(true);
                }
            }
        }

        /// <summary>
        ///     全部选中事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuSelectAll_Click(object sender, RoutedEventArgs e)
        {
            if (MultiCheckTree.ItemsSource != null)
            {
                foreach (TreeModel tree in MultiCheckTree.ItemsSource)
                {
                    tree.IsChecked = true;
                    tree.SetChildrenChecked(true);
                }
            }
        }

        /// <summary>
        ///     选中所有子项菜单事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuSelectAllChild_Click(object sender, RoutedEventArgs e)
        {
            if (MultiCheckTree.SelectedItem != null)
            {
                var tree = (TreeModel)MultiCheckTree.SelectedItem;
                tree.IsChecked = true;
                tree.SetChildrenChecked(true);
            }
        }

        /// <summary>
        ///     全部折叠菜单事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuUnExpandAll_Click(object sender, RoutedEventArgs e)
        {
            if (MultiCheckTree.ItemsSource != null)
            {
                foreach (TreeModel tree in MultiCheckTree.ItemsSource)
                {
                    tree.IsExpanded = false;
                    tree.SetChildrenExpanded(false);
                }
            }
        }

        /// <summary>
        ///     全部取消选中
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuUnSelectAll_Click(object sender, RoutedEventArgs e)
        {
            if (MultiCheckTree.ItemsSource != null)
            {
                foreach (TreeModel tree in MultiCheckTree.ItemsSource)
                {
                    tree.IsChecked = false;
                    tree.SetChildrenChecked(false);
                }
            }
        }

        private void treeNode_Click(object sender, RoutedEventArgs e)
        {
            if (VisualUpwardSearch<TreeViewItem>(e.OriginalSource as DependencyObject) is TreeViewItem item)
            {
                item.Focus();
                if (MultiCheckTree.SelectedItem != null)
                {
                    var tree = (TreeModel)MultiCheckTree.SelectedItem;
                    tree.SetChildrenChecked();
                    tree.SetParentChecked();
                }

                e.Handled = true;
            }
        }

        /// <summary>
        ///     鼠标右键事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void TreeViewItem_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (VisualUpwardSearch<TreeViewItem>(e.OriginalSource as DependencyObject) is TreeViewItem item)
            {
                item.Focus();
                e.Handled = true;
            }
        }
    }
}