// GuideOverlayWindow.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Windows.Media.Imaging;
using System.IO;
using System.Windows.Input;

namespace VisionCommonUI.UserGuide {
    public partial class GuideOverlayWindow : Window {
        public Action OnNextClicked;
        public Action OnPrevClicked;
        public Action OnExitClicked;
        public bool IsClosing { get; private set; } = false;

        protected override void OnClosing(System.ComponentModel.CancelEventArgs e) {
            IsClosing = true;
            base.OnClosing(e);
        }
        private RectangleGeometry _highlightGeometry;
        public GuideOverlayWindow() {
            InitializeComponent();
            Loaded += (_, __) =>
            {
                Mouse.Capture(this, CaptureMode.SubTree);
            };
            Deactivated += (_, __) => OnExitClicked?.Invoke();
        }

        public void Highlight(GuideStep step) {
            var area = step.HighlightArea;

            double x = Math.Floor(area.X);
            double y = Math.Floor(area.Y);
            double w = Math.Ceiling(area.Width);
            double h = Math.Ceiling(area.Height);
            double canvasW = Math.Ceiling(RootCanvas.ActualWidth);
            double canvasH = Math.Ceiling(RootCanvas.ActualHeight);

            // Top
            OverlayTop.Width = canvasW;
            OverlayTop.Height = y;
            Canvas.SetLeft(OverlayTop, 0);
            Canvas.SetTop(OverlayTop, 0);

            // Bottom
            OverlayBottom.Width = canvasW;
            OverlayBottom.Height = canvasH - (y + h);
            Canvas.SetLeft(OverlayBottom, 0);
            Canvas.SetTop(OverlayBottom, y + h);

            // Left
            OverlayLeft.Width = x;
            OverlayLeft.Height = h;
            Canvas.SetLeft(OverlayLeft, 0);
            Canvas.SetTop(OverlayLeft, y);

            // Right
            OverlayRight.Width = canvasW - (x + w);
            OverlayRight.Height = h;
            Canvas.SetLeft(OverlayRight, x + w);
            Canvas.SetTop(OverlayRight, y);


            HighlightRect.Width = w;
            HighlightRect.Height = h;
            Canvas.SetLeft(HighlightRect, x);
            Canvas.SetTop(HighlightRect, y);

            MessageText.Text = step.Message;
            MessageText.FontSize = step.FontSize;
            MessageText.Width = this.ActualWidth;
            MessageText.TextAlignment = TextAlignment.Left;
            MessageText.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
            var textSize = MessageText.DesiredSize;

            Point textPosition = (step.Placement == MessagePlacement.Above)
                ? new Point(area.X, Math.Max(area.Y - textSize.Height - 10, 0))
                : new Point(area.X, area.Bottom + 10);

            Canvas.SetLeft(MessageText, textPosition.X);
            Canvas.SetTop(MessageText, textPosition.Y);

            if (step.Imagesc != null) {
                MessageImage.Source = step.Imagesc;
                MessageImage.Visibility = Visibility.Visible;
                // 초기 크기 설정
                double baseWidth = this.ActualWidth * 0.7;
                double baseHeight = baseWidth * 0.66;
                Size imageSize = new Size(baseWidth, baseHeight);

                // 적절한 위치 계산
                Point textPos = new Point(Canvas.GetLeft(MessageText), Canvas.GetTop(MessageText));
                var smartPos = GetSmartImagePosition(step.HighlightArea, textPos, imageSize, out Size finalSize);

                MessageImage.Width = finalSize.Width;
                MessageImage.Height = finalSize.Height;

                Canvas.SetLeft(MessageImage, smartPos.X);
                Canvas.SetTop(MessageImage, smartPos.Y);
            }
            else {
                MessageImage.Visibility = Visibility.Collapsed;
            }
        }
        private Point GetSmartImagePosition(Rect highlight, Point textPosition, Size originalSize, out Size finalSize) {
            double canvasWidth = RootCanvas.ActualWidth;
            double canvasHeight = RootCanvas.ActualHeight;
            double padding = 10;

            double textBottom = textPosition.Y + MessageText.DesiredSize.Height;

            var below = new Point(highlight.X, textBottom + padding);
            var right = new Point(highlight.Right + padding, highlight.Top);
            var top = new Point(highlight.X, highlight.Y - originalSize.Height - padding);

            // 기본: 크기 유지
            finalSize = originalSize;

            bool FitsBelow = below.Y + originalSize.Height < canvasHeight;
            bool FitsRight = right.X + originalSize.Width < canvasWidth;
            bool FitsTop = top.Y > 0;

            if (FitsBelow) {
                return below;
            }
            if (FitsRight) {
                return right;
            }
            if (FitsTop) {
                return top;
            }

            // 축소 시도
            double scale = 0.8;
            while (scale > 0.3) {
                var scaled = new Size(originalSize.Width * scale, originalSize.Height * scale);

                if (textBottom + padding + scaled.Height < canvasHeight) {
                    finalSize = scaled;
                    return new Point(highlight.X, textBottom + padding);
                }

                scale -= 0.1;
            }

            // Fallback
            finalSize = new Size(200, 150);
            return new Point(10, 10);
        }

        private void Grid_MouseDown(object sender, MouseButtonEventArgs e) {
            if (e.OriginalSource is DependencyObject source && IsInsideGuideOverlay(source)) {
                OnNextClicked?.Invoke();
            }
            else {
                OnExitClicked?.Invoke();
            }
        }

        private void Grid_PreviewMouseWheel(object sender, MouseWheelEventArgs e) {
            if (e.Delta > 0) {
                OnPrevClicked?.Invoke();
                e.Handled = true;
            }
        }
        private bool IsInsideGuideOverlay(DependencyObject source) {
            while (source != null) {
                if (source == this) {
                    return true;
                }
                source = VisualTreeHelper.GetParent(source);
            }
            return false;
        }

        private void Window_PreviewMouseDown(object sender, MouseButtonEventArgs e) {
            Point clickPos = e.GetPosition(RootCanvas);

            // HitTest 대상 찾기
            HitTestResult result = VisualTreeHelper.HitTest(RootCanvas, clickPos);
            FrameworkElement hit = result != null ? result.VisualHit as FrameworkElement : null;

            if (hit == null || string.IsNullOrEmpty(hit.Name)) {
                OnExitClicked?.Invoke();
            }
        }
    }
}