using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Controls.Primitives;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Animation;

namespace Ink_Canvas.Helpers
{
    internal class AnimationsHelper
    {
        #region Win32 API - 用于提升 Popup 层级和刷新位置

        [DllImport("user32.dll")]
        private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

        [DllImport("user32.dll")]
        private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

        [DllImport("user32.dll")]
        private static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);

        [StructLayout(LayoutKind.Sequential)]
        private struct RECT
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

        private const uint GW_HWNDPREV = 3;
        private static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
        private static readonly IntPtr HWND_TOP = new IntPtr(0);
        private const uint SWP_NOMOVE = 0x0002;
        private const uint SWP_NOSIZE = 0x0001;
        private const uint SWP_NOACTIVATE = 0x0010;
        private const uint SWP_SHOWWINDOW = 0x0040;

        /// <summary>
        /// 强制刷新 Popup 的实际窗口位置（终极方案）
        /// 通过 Win32 API 直接操作窗口句柄
        /// </summary>
        public static void ForceRefreshPopupPosition(Popup popup)
        {
            if (popup?.Child == null || !popup.IsOpen) return;

            try
            {
                Application.Current.Dispatcher.BeginInvoke(new Action(() =>
                {
                    try
                    {
                        var source = PresentationSource.FromVisual(popup.Child) as HwndSource;
                        if (source?.Handle == null) return;

                        var hwnd = source.Handle;

                        // 获取当前窗口位置
                        if (GetWindowRect(hwnd, out RECT rect))
                        {
                            // 使用相同的参数调用 SetWindowPos，但加上 SWP_SHOWWINDOW
                            // 这会强制窗口管理器重新评估并更新窗口位置
                            SetWindowPos(
                                hwnd,
                                HWND_TOP,
                                rect.Left, rect.Top,
                                rect.Right - rect.Left,
                                rect.Bottom - rect.Top,
                                SWP_NOACTIVATE | SWP_SHOWWINDOW);

                            System.Diagnostics.Debug.WriteLine($"[PopupZOrder] Force refreshed position: ({rect.Left}, {rect.Top})");
                        }
                    }
                    catch (Exception ex)
                    {
                        System.Diagnostics.Debug.WriteLine($"[PopupZOrder] ForceRefreshPopupPosition failed: {ex.Message}");
                    }
                }), System.Windows.Threading.DispatcherPriority.Render);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"[PopupZOrder] ForceRefreshPopupPosition error: {ex.Message}");
            }
        }

        /// <summary>
        /// 将 Popup 窗口提升到最顶层，确保不被其他控件遮挡
        /// 采用多重策略确保置顶生效
        /// </summary>
        private static void BringPopupToFront(Popup popup)
        {
            try
            {
                if (popup?.Child == null) return;

                Action bringToTopAction = () =>
                {
                    try
                    {
                        var source = PresentationSource.FromVisual(popup.Child) as HwndSource;
                        if (source?.Handle == null) return;

                        var hwnd = source.Handle;

                        // 策略1：直接设置为 TOPMOST（最高优先级）
                        SetWindowPos(hwnd, HWND_TOPMOST,
                            0, 0, 0, 0,
                            SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_SHOWWINDOW);

                        System.Diagnostics.Debug.WriteLine($"[PopupZOrder] Set TOPMOST for popup");
                    }
                    catch (Exception ex)
                    {
                        System.Diagnostics.Debug.WriteLine($"[PopupZOrder] BringPopupToFront failed: {ex.Message}");
                    }
                };

                // 立即执行第一次
                Application.Current.Dispatcher.BeginInvoke(bringToTopAction,
                    System.Windows.Threading.DispatcherPriority.Render);

                // 延迟 50ms 后再次执行（确保在其他窗口操作之后）
                Application.Current.Dispatcher.BeginInvoke(bringToTopAction,
                    System.Windows.Threading.DispatcherPriority.Normal);

                // 延迟 100ms 后第三次执行（最终确认）
                Application.Current.Dispatcher.BeginInvoke(bringToTopAction,
                    System.Windows.Threading.DispatcherPriority.Background);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"[PopupZOrder] BringPopupToFront error: {ex.Message}");
            }
        }

        #endregion

        private static UIElement ResolveAnimationTarget(UIElement element)
        {
            return element;
        }

        public static void ShowWithFadeIn(UIElement element, double duration = 0.15)
        {
            if (element.Visibility == Visibility.Visible) return;

            if (element == null)
                throw new ArgumentNullException(nameof(element));

            var sb = new Storyboard();

            // 渐变动画
            var fadeInAnimation = new DoubleAnimation
            {
                From = 0.5,
                To = 1,
                Duration = TimeSpan.FromSeconds(duration)
            };
            Storyboard.SetTargetProperty(fadeInAnimation, new PropertyPath(UIElement.OpacityProperty));

            sb.Children.Add(fadeInAnimation);

            element.Visibility = Visibility.Visible;

            sb.Begin((FrameworkElement)element);
        }

        public static void ShowWithSlideFromBottomAndFade(UIElement element, double duration = 0.15)
        {
            try
            {
                if (element == null)
                    throw new ArgumentNullException(nameof(element));

                if (element.Visibility == Visibility.Visible) return;

                element.Visibility = Visibility.Visible;

                var target = ResolveAnimationTarget(element);

                var sb = new Storyboard();

                var fadeInAnimation = new DoubleAnimation
                {
                    From = 0.5,
                    To = 1,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                fadeInAnimation.EasingFunction = new CubicEase();

                Storyboard.SetTargetProperty(fadeInAnimation, new PropertyPath(UIElement.OpacityProperty));

                var slideAnimation = new DoubleAnimation
                {
                    From = 10,
                    To = 0,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                Storyboard.SetTargetProperty(slideAnimation, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.Y)"));

                slideAnimation.EasingFunction = new CubicEase();

                sb.Children.Add(fadeInAnimation);
                sb.Children.Add(slideAnimation);

                target.RenderTransform = new TranslateTransform();

                sb.Begin((FrameworkElement)target);
            }
            catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex); }
        }

        public static void ShowWithSlideFromLeftAndFade(UIElement element, double duration = 0.25)
        {
            try
            {
                if (element.Visibility == Visibility.Visible) return;

                if (element == null)
                    throw new ArgumentNullException(nameof(element));

                var sb = new Storyboard();

                // 渐变动画
                var fadeInAnimation = new DoubleAnimation
                {
                    From = 0.5,
                    To = 1,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                Storyboard.SetTargetProperty(fadeInAnimation, new PropertyPath(UIElement.OpacityProperty));

                // 滑动动画
                var slideAnimation = new DoubleAnimation
                {
                    From = element.RenderTransform.Value.OffsetX - 20, // 滑动距离
                    To = 0,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                Storyboard.SetTargetProperty(slideAnimation, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.X)"));

                sb.Children.Add(fadeInAnimation);
                sb.Children.Add(slideAnimation);

                element.Visibility = Visibility.Visible;
                element.RenderTransform = new TranslateTransform();

                sb.Begin((FrameworkElement)element);
            }
            catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex); }
        }

        public static void ShowWithScaleFromLeft(UIElement element, double duration = 0.2)
        {
            try
            {
                if (element.Visibility == Visibility.Visible) return;

                if (element == null)
                    throw new ArgumentNullException(nameof(element));

                var sb = new Storyboard();

                // 水平方向的缩放动画
                var scaleXAnimation = new DoubleAnimation
                {
                    From = 0,
                    To = 1,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                Storyboard.SetTargetProperty(scaleXAnimation, new PropertyPath("(UIElement.RenderTransform).(ScaleTransform.ScaleX)"));

                // 垂直方向的缩放动画
                var scaleYAnimation = new DoubleAnimation
                {
                    From = 0,
                    To = 1,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                scaleYAnimation.EasingFunction = new CubicEase();
                scaleXAnimation.EasingFunction = new CubicEase();
                Storyboard.SetTargetProperty(scaleYAnimation, new PropertyPath("(UIElement.RenderTransform).(ScaleTransform.ScaleY)"));

                sb.Children.Add(scaleXAnimation);
                sb.Children.Add(scaleYAnimation);

                element.Visibility = Visibility.Visible;
                element.RenderTransformOrigin = new Point(0, 0.5); // 左侧中心点为基准
                element.RenderTransform = new ScaleTransform(0, 0);

                sb.Begin((FrameworkElement)element);
            }
            catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex); }
        }

        public static void ShowWithScaleFromRight(UIElement element, double duration = 0.2)
        {
            try
            {
                if (element.Visibility == Visibility.Visible) return;

                if (element == null)
                    throw new ArgumentNullException(nameof(element));

                var sb = new Storyboard();

                // 水平方向的缩放动画
                var scaleXAnimation = new DoubleAnimation
                {
                    From = 0,
                    To = 1,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                Storyboard.SetTargetProperty(scaleXAnimation, new PropertyPath("(UIElement.RenderTransform).(ScaleTransform.ScaleX)"));

                // 垂直方向的缩放动画
                var scaleYAnimation = new DoubleAnimation
                {
                    From = 0,
                    To = 1,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                Storyboard.SetTargetProperty(scaleYAnimation, new PropertyPath("(UIElement.RenderTransform).(ScaleTransform.ScaleY)"));

                scaleYAnimation.EasingFunction = new CubicEase();
                scaleXAnimation.EasingFunction = new CubicEase();

                sb.Children.Add(scaleXAnimation);
                sb.Children.Add(scaleYAnimation);

                element.Visibility = Visibility.Visible;
                element.RenderTransformOrigin = new Point(1, 0.5); // 右侧中心点为基准
                element.RenderTransform = new ScaleTransform(0, 0);

                sb.Begin((FrameworkElement)element);
            }
            catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex); }
        }

        public static void HideWithSlideAndFade(UIElement element, double duration = 0.15)
        {
            try
            {
                if (element == null)
                    throw new ArgumentNullException(nameof(element));

                if (element.Visibility == Visibility.Collapsed) return;

                var target = ResolveAnimationTarget(element);

                var sb = new Storyboard();

                var fadeOutAnimation = new DoubleAnimation
                {
                    From = 1,
                    To = 0,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                fadeOutAnimation.EasingFunction = new CubicEase();
                Storyboard.SetTargetProperty(fadeOutAnimation, new PropertyPath(UIElement.OpacityProperty));

                var slideAnimation = new DoubleAnimation
                {
                    From = 0,
                    To = 10,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                slideAnimation.EasingFunction = new CubicEase();

                Storyboard.SetTargetProperty(slideAnimation, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.Y)"));

                sb.Children.Add(fadeOutAnimation);
                sb.Children.Add(slideAnimation);

                sb.Completed += (s, e) =>
                {
                    element.Visibility = Visibility.Collapsed;
                };

                target.RenderTransform = new TranslateTransform();
                sb.Begin((FrameworkElement)target);
            }
            catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex); }
        }

        public static void HideWithFadeOut(UIElement element, double duration = 0.15)
        {
            if (element.Visibility == Visibility.Collapsed) return;

            if (element == null)
                throw new ArgumentNullException(nameof(element));

            var sb = new Storyboard();

            var fadeOutAnimation = new DoubleAnimation
            {
                From = 1,
                To = 0,
                Duration = TimeSpan.FromSeconds(duration)
            };
            Storyboard.SetTargetProperty(fadeOutAnimation, new PropertyPath(UIElement.OpacityProperty));

            sb.Children.Add(fadeOutAnimation);

            sb.Completed += (s, e) =>
            {
                element.Visibility = Visibility.Collapsed;
            };

            sb.Begin((FrameworkElement)element);
        }

        public static void ShowPopupWithSlideAndFade(Popup popup, double duration = 0.15)
        {
            try
            {
                if (popup == null)
                    throw new ArgumentNullException(nameof(popup));

                if (popup.IsOpen) return;

                var child = popup.Child as FrameworkElement;
                if (child == null)
                {
                    popup.IsOpen = true;
                    BringPopupToFront(popup);
                    return;
                }

                child.Opacity = 0.5;
                child.RenderTransform = new TranslateTransform(0, 10);

                popup.IsOpen = true;

                // 提升 Popup 到最顶层
                BringPopupToFront(popup);

                var sb = new Storyboard();

                var fadeInAnimation = new DoubleAnimation
                {
                    From = 0.5,
                    To = 1,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                fadeInAnimation.EasingFunction = new CubicEase();
                Storyboard.SetTargetProperty(fadeInAnimation, new PropertyPath(UIElement.OpacityProperty));

                var slideAnimation = new DoubleAnimation
                {
                    From = 10,
                    To = 0,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                slideAnimation.EasingFunction = new CubicEase();
                Storyboard.SetTargetProperty(slideAnimation, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.Y)"));

                sb.Children.Add(fadeInAnimation);
                sb.Children.Add(slideAnimation);

                sb.Begin(child);
            }
            catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex); }
        }

        public static void HidePopupWithSlideAndFade(Popup popup, double duration = 0.15)
        {
            try
            {
                if (popup == null)
                    throw new ArgumentNullException(nameof(popup));

                if (!popup.IsOpen) return;

                var child = popup.Child as FrameworkElement;
                if (child == null)
                {
                    popup.IsOpen = false;
                    return;
                }

                var sb = new Storyboard();

                var fadeOutAnimation = new DoubleAnimation
                {
                    From = 1,
                    To = 0,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                fadeOutAnimation.EasingFunction = new CubicEase();
                Storyboard.SetTargetProperty(fadeOutAnimation, new PropertyPath(UIElement.OpacityProperty));

                var slideAnimation = new DoubleAnimation
                {
                    From = 0,
                    To = 10,
                    Duration = TimeSpan.FromSeconds(duration)
                };
                slideAnimation.EasingFunction = new CubicEase();
                Storyboard.SetTargetProperty(slideAnimation, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.Y)"));

                sb.Children.Add(fadeOutAnimation);
                sb.Children.Add(slideAnimation);

                sb.Completed += (s, e) =>
                {
                    popup.IsOpen = false;
                    child.Opacity = 1;
                    child.RenderTransform = new TranslateTransform();
                };

                child.RenderTransform = new TranslateTransform();
                sb.Begin(child);
            }
            catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex); }
        }

    }
}