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

namespace DrillTools
{
    /// <summary>
    /// ToolReorderConfirmationWindow.xaml 的交互逻辑
    /// </summary>
    public partial class ToolReorderConfirmationWindow : Window
    {
        /// <summary>
        /// 是否确认重排
        /// </summary>
        public bool IsConfirmed { get; private set; }

        /// <summary>
        /// 标记是否正在处理选中项同步，防止递归调用
        /// </summary>
        private bool _isSynchronizingSelection = false;

        /// <summary>
        /// 构造函数
        /// </summary>
        public ToolReorderConfirmationWindow()
        {
            InitializeComponent();
            DataContext = new ToolReorderConfirmationViewModel();
        }

        /// <summary>
        /// 使用原始和重排后的刀具列表初始化窗口
        /// </summary>
        /// <param name="originalTools">原始刀具列表</param>
        /// <param name="reorderedTools">重排后刀具列表</param>
        public ToolReorderConfirmationWindow(IEnumerable<ToolItem> originalTools, IEnumerable<ToolItem> reorderedTools) : this()
        {
            if (DataContext is ToolReorderConfirmationViewModel viewModel)
            {
                viewModel.LoadTools(originalTools, reorderedTools);
            }
        }

        /// <summary>
        /// 确认按钮点击事件
        /// </summary>
        private void ConfirmButton_Click(object sender, RoutedEventArgs e)
        {
            IsConfirmed = true;
            Close();
        }

        /// <summary>
        /// 取消按钮点击事件
        /// </summary>
        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            IsConfirmed = false;
            Close();
        }

        /// <summary>
        /// 原始刀序列表滚动事件处理
        /// </summary>
        private void OriginalToolsListView_ScrollChanged(object sender, ScrollChangedEventArgs e)
        {
            if (sender is System.Windows.Controls.ListView listView && e.VerticalChange != 0)
            {
                // 获取原始列表的滚动位置
                var scrollViewer = GetScrollViewer(listView);
                if (scrollViewer != null)
                {
                    // 同步到重排后列表
                    var reorderedScrollViewer = GetScrollViewer(ReorderedToolsListView);
                    if (reorderedScrollViewer != null)
                    {
                        reorderedScrollViewer.ScrollToVerticalOffset(scrollViewer.VerticalOffset);
                    }
                }
            }
        }

        /// <summary>
        /// 重排后刀序列表滚动事件处理
        /// </summary>
        private void ReorderedToolsListView_ScrollChanged(object sender, ScrollChangedEventArgs e)
        {
            if (sender is System.Windows.Controls.ListView listView && e.VerticalChange != 0)
            {
                // 获取重排后列表的滚动位置
                var scrollViewer = GetScrollViewer(listView);
                if (scrollViewer != null)
                {
                    // 同步到原始列表
                    var originalScrollViewer = GetScrollViewer(OriginalToolsListView);
                    if (originalScrollViewer != null)
                    {
                        originalScrollViewer.ScrollToVerticalOffset(scrollViewer.VerticalOffset);
                    }
                }
            }
        }

        /// <summary>
        /// 原始刀序列表选中项变化事件处理
        /// </summary>
        private void OriginalToolsListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_isSynchronizingSelection)
                return;

            try
            {
                _isSynchronizingSelection = true;

                if (OriginalToolsListView.SelectedItem is ToolOrderItem selectedOriginalItem)
                {
                    // 在重排后列表中查找对应的刀具
                    var matchingItem = FindMatchingToolItem(ReorderedToolsListView, selectedOriginalItem);
                    if (matchingItem != null)
                    {
                        ReorderedToolsListView.SelectedItem = matchingItem;
                        // 确保选中的项可见
                        ReorderedToolsListView.ScrollIntoView(matchingItem);
                    }
                }
                else
                {
                    // 如果原始列表没有选中项，清空重排后列表的选中项
                    ReorderedToolsListView.SelectedItem = null;
                }
            }
            finally
            {
                _isSynchronizingSelection = false;
            }
        }

        /// <summary>
        /// 重排后刀序列表选中项变化事件处理
        /// </summary>
        private void ReorderedToolsListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_isSynchronizingSelection)
                return;

            try
            {
                _isSynchronizingSelection = true;

                if (ReorderedToolsListView.SelectedItem is ToolOrderItem selectedReorderedItem)
                {
                    // 在原始列表中查找对应的刀具
                    var matchingItem = FindMatchingToolItem(OriginalToolsListView, selectedReorderedItem);
                    if (matchingItem != null)
                    {
                        OriginalToolsListView.SelectedItem = matchingItem;
                        // 确保选中的项可见
                        OriginalToolsListView.ScrollIntoView(matchingItem);
                    }
                }
                else
                {
                    // 如果重排后列表没有选中项，清空原始列表的选中项
                    OriginalToolsListView.SelectedItem = null;
                }
            }
            finally
            {
                _isSynchronizingSelection = false;
            }
        }

        /// <summary>
        /// 在ListView中查找匹配的刀具项
        /// </summary>
        /// <param name="listView">要搜索的ListView</param>
        /// <param name="targetItem">目标刀具项</param>
        /// <returns>匹配的刀具项，如果未找到则返回null</returns>
        private ToolOrderItem FindMatchingToolItem(System.Windows.Controls.ListView listView, ToolOrderItem targetItem)
        {
            if (listView?.ItemsSource == null || targetItem == null)
                return null;

            foreach (var item in listView.Items)
            {
                if (item is ToolOrderItem toolItem)
                {
                    // 使用与ViewModel中相同的匹配逻辑：基于孔径和刀具类型
                    // 注意：这里使用ToolTypeDisplay进行比较，因为ToolOrderItem中没有ToolType属性
                    if (Math.Abs(toolItem.Diameter - targetItem.Diameter) < 0.001 &&
                        toolItem.ToolTypeDisplay == targetItem.ToolTypeDisplay)
                    {
                        return toolItem;
                    }
                }
            }

            return null;
        }

        /// <summary>
        /// 获取ListView中的ScrollViewer控件
        /// </summary>
        /// <param name="listView">ListView控件</param>
        /// <returns>ScrollViewer控件</returns>
        private ScrollViewer GetScrollViewer(System.Windows.Controls.ListView listView)
        {
            if (listView == null)
                return null;

            // 使用VisualTreeHelper查找ScrollViewer
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(listView); i++)
            {
                var child = VisualTreeHelper.GetChild(listView, i);
                if (child is ScrollViewer scrollViewer)
                {
                    return scrollViewer;
                }
                // 递归查找子控件
                var result = GetScrollViewerFromChild(child);
                if (result != null)
                    return result;
            }
            return null;
        }

        /// <summary>
        /// 从子控件中递归查找ScrollViewer
        /// </summary>
        /// <param name="parent">父控件</param>
        /// <returns>ScrollViewer控件</returns>
        private ScrollViewer GetScrollViewerFromChild(DependencyObject parent)
        {
            if (parent == null)
                return null;

            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
            {
                var child = VisualTreeHelper.GetChild(parent, i);
                if (child is ScrollViewer scrollViewer)
                {
                    return scrollViewer;
                }
                // 递归查找
                var result = GetScrollViewerFromChild(child);
                if (result != null)
                    return result;
            }
            return null;
        }
    }
}