using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using HandyControl.Controls;
using PgItem = PropertyGridLib.Controls.PropertyItem;

namespace TeamAAS.Dialogs.Dialogs
{
    /// <summary>
    /// 基于 PropertyGridLib 的通用属性编辑对话框。
    /// 将任意对象传入 SelectedObject，PropertyGrid 自动生成编辑界面。
    /// 可选执行按钮：传入 ExecuteAction 后显示"执行"按钮，点击后台执行不卡UI，执行中变为"停止"可取消。
    /// </summary>
    public partial class PropertyGridDialog
    {
        /// <summary>用户是否点击了确定</summary>
        public bool Result { get; private set; }

        /// <summary>执行回调（对象, 取消令牌），传入则显示执行按钮</summary>
        public Action<object, CancellationToken> ExecuteAction { get; set; }

        private CancellationTokenSource _cts;
        private bool _isExecuting;
        private bool _refreshingProperties;

        /// <summary>最近一次持久提示。悬停提示结束后回落到这里。</summary>
        private string _lastTip = string.Empty;

        /// <summary>当前编辑的对象</summary>
        public object SelectedObject
        {
            get => PropertyGrid.SelectedObject;
            set
            {
                PropertyGrid.SelectedObject = value;
                Title = $"属性编辑 - {value?.GetType().Name ?? ""}";
            }
        }

        /// <summary>自定义窗口标题</summary>
        public string DialogTitle
        {
            get => Title;
            set => Title = value;
        }

        public PropertyGridDialog()
        {
            InitializeComponent();
            UiScaler.Attach(this); // 分辨率/DPI 自适应
            Closing += (s, e) => { if (_isExecuting) e.Cancel = true; };
            PropertyGrid.AddHandler(Selector.SelectionChangedEvent, new SelectionChangedEventHandler(OnComboSelectionChanged), true);
            PropertyGrid.AddHandler(UIElement.PreviewMouseLeftButtonDownEvent, new MouseButtonEventHandler(OnComboPreviewMouseDown), true);
            // 回车 = 确认（执行中除外）
            PreviewKeyDown += (s, e) =>
            {
                if (e.Key == System.Windows.Input.Key.Enter && !_isExecuting)
                {
                    BtnOK.RaiseEvent(new RoutedEventArgs(System.Windows.Controls.Button.ClickEvent));
                    e.Handled = true;
                }
            };
        }

        /// <summary>
        /// 设置编辑对象和标题。
        /// </summary>
        public void Setup(object obj, string title = null)
        {
            PropertyGrid.SelectedObject = obj;
            Title = title ?? $"属性编辑 - {obj?.GetType().Name ?? ""}";
        }

        /// <summary>
        /// 设置编辑对象、标题和执行回调。
        /// </summary>
        public void Setup(object obj, string title, Action<object, CancellationToken> executeAction)
        {
            PropertyGrid.SelectedObject = obj;
            Title = title ?? $"属性编辑 - {obj?.GetType().Name ?? ""}";
            ExecuteAction = executeAction;
            if (executeAction != null)
                BtnExecute.Visibility = Visibility.Visible;
        }

        /// <summary>
        /// 设置底部提示栏的持久提示（线程安全）。null/空 = 显示最近一次持久提示。
        /// </summary>
        public void ShowTip(string message)
        {
            void Apply()
            {
                if (string.IsNullOrWhiteSpace(message))
                {
                    TxtTip.Text = _lastTip;
                    return;
                }
                _lastTip = message;
                TxtTip.Text = message;
            }

            if (Dispatcher.CheckAccess()) Apply(); else Dispatcher.Invoke(Apply);
        }

        /// <summary>
        /// 显示鼠标悬停临时提示（线程安全）。message 为 null/空时结束悬停，回落到最近一次持久提示。
        /// </summary>
        public void ShowHoverHint(string message)
        {
            void Apply()
            {
                TxtTip.Text = string.IsNullOrWhiteSpace(message) ? _lastTip : message;
            }

            if (Dispatcher.CheckAccess()) Apply(); else Dispatcher.Invoke(Apply);
        }

        /// <summary>窗体自带按钮的悬停提示：把 Tag 文本写入底部提示栏</summary>
        private void BtnTip_MouseEnter(object sender, MouseEventArgs e)
        {
            if ((sender as FrameworkElement)?.Tag is string tip && !string.IsNullOrWhiteSpace(tip))
                TxtTip.Text = tip;
        }

        /// <summary>悬停结束：回落到最近一次持久提示</summary>
        private void BtnTip_MouseLeave(object sender, MouseEventArgs e)
        {
            TxtTip.Text = _lastTip;
        }

        private void BtnExecute_Click(object sender, RoutedEventArgs e)
        {
            if (_isExecuting)
            {
                // 正在执行 → 停止
                _cts?.Cancel();
                return;
            }

            // 开始执行
            _cts = new CancellationTokenSource();
            _isExecuting = true;
            BtnExecute.Content = "停止";
            BtnExecute.Style = FindResource("ButtonDanger") as System.Windows.Style;
            PropertyGrid.IsEnabled = false;
            BtnOK.IsEnabled = false;
            BtnCancel.IsEnabled = false;

            var token = _cts.Token;
            var obj = PropertyGrid.SelectedObject;

            Task.Run(() =>
            {
                try
                {
                    ExecuteAction?.Invoke(obj, token);
                }
                catch (OperationCanceledException) { }
                catch (Exception ex)
                {
                    Dispatcher.Invoke(() => Growl.Error($"执行失败: {ex.Message}"));
                }
            }).ContinueWith(t =>
            {
                Dispatcher.Invoke(() =>
                {
                    _isExecuting = false;
                    BtnExecute.Content = "执行";
                    BtnExecute.Style = FindResource("ButtonInfo") as System.Windows.Style;
                    PropertyGrid.IsEnabled = true;
                    BtnOK.IsEnabled = true;
                    BtnCancel.IsEnabled = true;
                    if (t.IsCanceled)
                        Growl.Info("已停止");
                });
            });
        }

        private void BtnOK_Click(object sender, RoutedEventArgs e)
        {
            _cts?.Cancel();
            // 强制让 PropertyGrid 中的所有编辑控件提交修改
            // 关键：PropertyGridLib 的 ComboBox 使用 LostFocus 作为 UpdateSourceTrigger
            // 所以需要在关闭前确保所有下拉框关闭且焦点移出

            // 1. 关闭所有打开的 ComboBox 下拉框
            CloseAllComboBoxes(PropertyGrid);

            // 2. 临时将焦点移到按钮上，这会触发 PropertyGrid 内部控件的 LostFocus 事件
            BtnOK.Focus();

            // 3. 等待一个 Dispatcher 帧，让绑定更新生效
            Dispatcher.Invoke(() => { }, System.Windows.Threading.DispatcherPriority.Input);

            Result = true;
            Close();
        }

        /// <summary>
        /// 递归关闭所有 ComboBox 的下拉框
        /// </summary>
        private static void CloseAllComboBoxes(DependencyObject root)
        {
            if (root == null) return;
            int count = VisualTreeHelper.GetChildrenCount(root);
            for (int i = 0; i < count; i++)
            {
                var child = VisualTreeHelper.GetChild(root, i);
                if (child is System.Windows.Controls.ComboBox combo && combo.IsDropDownOpen)
                {
                    combo.IsDropDownOpen = false;
                }
                CloseAllComboBoxes(child);
            }
        }

        private void BtnCancel_Click(object sender, RoutedEventArgs e)
        {
            _cts?.Cancel();
            Result = false;
            Close();
        }

        private void OnComboSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_refreshingProperties || e.AddedItems == null || e.AddedItems.Count == 0) return;
            var combo = e.OriginalSource as System.Windows.Controls.ComboBox
                        ?? FindComboBox(e.OriginalSource as DependencyObject);
            if (combo?.DataContext is not PgItem item) return;
            var owner = PropertyGrid.SelectedObject;
            if (owner == null || string.IsNullOrEmpty(item.Name)) return;

            var pd = TypeDescriptor.GetProperties(owner)[item.Name];
            if (pd == null || pd.IsReadOnly) return;

            object val = combo.SelectedItem ?? combo.Text;
            object current = pd.GetValue(owner);
            if (val != null && !Equals(current, val))
            {
                try { pd.SetValue(owner, val); }
                catch { /* 类型转换失败时仍走 LostFocus 写回 */ }
            }

            var refresh = pd.Attributes[typeof(RefreshPropertiesAttribute)] as RefreshPropertiesAttribute;
            if (refresh == null || refresh.RefreshProperties == RefreshProperties.None) return;
            if (Equals(current, val)) return;

            _refreshingProperties = true;
            try
            {
                PropertyGrid.RefreshProperties();
            }
            finally
            {
                _refreshingProperties = false;
            }
        }

        /// <summary>
        /// PropertyGridLib 只在创建属性项时抓一次 TypeConverter 下拉项。展开前按当前对象重取，
        /// 这样「先选卡再选轴」能看到该卡的轴列表。
        /// </summary>
        private void OnComboPreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            var combo = FindComboBox(e.OriginalSource as DependencyObject);
            if (combo == null || combo.DataContext is not PgItem item) return;
            RefreshComboStandardValues(combo, item);
        }

        private void RefreshComboStandardValues(System.Windows.Controls.ComboBox combo, PgItem item)
        {
            var owner = PropertyGrid.SelectedObject;
            if (owner == null || string.IsNullOrEmpty(item.Name)) return;
            var pd = TypeDescriptor.GetProperties(owner)[item.Name];
            var conv = pd?.Converter;
            if (conv == null || !conv.GetStandardValuesSupported()) return;

            var values = conv.GetStandardValues(new EditorTypeDescriptorContext(owner, pd));
            if (values == null || values.Count == 0) return;

            var list = values.Cast<object>().ToList();
            combo.ItemsSource = list;
        }

        private static System.Windows.Controls.ComboBox FindComboBox(DependencyObject start)
        {
            for (var d = start; d != null; d = VisualTreeHelper.GetParent(d))
            {
                if (d is System.Windows.Controls.ComboBox combo) return combo;
            }
            return null;
        }

        private sealed class EditorTypeDescriptorContext : ITypeDescriptorContext
        {
            public EditorTypeDescriptorContext(object instance, PropertyDescriptor property)
            {
                Instance = instance;
                PropertyDescriptor = property;
            }

            public IContainer Container => null;
            public object Instance { get; }
            public PropertyDescriptor PropertyDescriptor { get; }
            public object GetService(Type serviceType) => null;
            public void OnComponentChanged() { }
            public bool OnComponentChanging() => true;
        }
    }
}