using PDF_Office.CustomControl.ScanViewControl;
using PDF_Office.ViewModels.Scan;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace PDF_Office.Views.Scan
{
    /// <summary>
    /// ScanViwer.xaml 的交互逻辑
    /// </summary>
    public partial class ScanViwer : UserControl
    {
        ScanViwerViewModel scanViwerViewModel;
        MenuItem item;
        ContextMenu contextMenu;
        public ScanViwer()
        {
            InitializeComponent();
        }

        double scale = 1;
        private void Grid_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
            {
                if (e.Delta > 0)
                {
                    scale += 0.1;
                    if (scanViwerViewModel.IsShowRect)
                    {
                        Rect rect = new Rect(drawRect.X * scale, drawRect.Y * scale, drawRect.Width * scale, drawRect.Height * scale);
                        BitmapPanel.SetRect(rect);
                        BitmapPanel.RectDraw();
                    }
                    ImageGrid.Width = 500 * scale;
                    ImageGrid.Height = 500 * scale;
                }
                else
                {
                    if (scale > 0.2)
                    {
                        scale -= 0.2;
                    }
                    if (scanViwerViewModel.IsShowRect)
                    {
                        Rect rect = new Rect(drawRect.X * scale, drawRect.Y * scale, drawRect.Width * scale, drawRect.Height * scale);
                        BitmapPanel.SetRect(rect);
                        BitmapPanel.RectDraw();
                    }
                    ImageGrid.Width = 500 * scale;
                    ImageGrid.Height = 500 * scale;

                }
            }
            RedressControl.Visibility = Visibility.Collapsed;
        }

        private Point MouseDownPos;
        bool dowm = false;
        bool CreateNewRect = false;
        private async void CustomPanel_MouseDown(object sender, MouseButtonEventArgs e)
        {
            RedressControl.Visibility = Visibility.Visible;
            MouseDownPos = e.GetPosition(BitmapPanel);
            HitTestResult hitResult = VisualTreeHelper.HitTest(BitmapPanel, MouseDownPos);
            if (hitResult != null && hitResult.VisualHit is CustomDraw)
            {
                CustomDraw hitChild = (CustomDraw)hitResult.VisualHit;
                BitmapPanel.DisplayContent(hitChild);
                RedressControl.SetValue(Canvas.LeftProperty, hitChild.PaintRect.Left + (hitChild.PaintRect.Width / 2 - RedressControl.ActualWidth / 2));
                if (hitChild.PaintRect.Top - RedressControl.ActualHeight > 0)
                {
                    RedressControl.SetValue(Canvas.TopProperty, hitChild.PaintRect.Top - RedressControl.ActualHeight);
                }
                else
                {
                    RedressControl.SetValue(Canvas.TopProperty, hitChild.PaintRect.Bottom);
                }
                RedressControl.HitChild = hitChild;
                RedressControl.TextBoxContext = hitChild.PaintText;
                await Task.Delay(5);
                RedressControl.SelectAll();
                return;
            }
            RedressControl.Visibility = Visibility.Collapsed;
        }

        private void RedressControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (!(bool)e.NewValue)
            {
                BitmapPanel.DisplayContent(null);
            }
        }

        private void RedressControl_ApplyCommandHandler(object sender, EventArgs e)
        {
            RedressControl.HitChild.PaintText = RedressControl.TextBoxContext;
            RedressControl.HitChild.Draw();
            RedressControl.Visibility = Visibility.Collapsed;
        }

        private void BitmapPanel_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (scanViwerViewModel.IsShowRect)
            {
                Point clickPoint = e.GetPosition(BitmapPanel);
                dowm = true;
                BitmapPanel.RectSetMaxRect(BitmapPanel.DrawRect);
                if (!BitmapPanel.RectMouseLeftButtonDown(clickPoint) && BitmapPanel.DrawRect.Contains(clickPoint))
                {
                    CreateNewRect = true;
                }
            }
        }

        private void BitmapPanel_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            dowm = false;
            CreateNewRect = false;
        }
        private Rect drawRect;
        private void BitmapPanel_MouseMove(object sender, MouseEventArgs e)
        {
            if (scanViwerViewModel.IsShowRect)
            {
                Point currentPos = e.GetPosition(BitmapPanel);
                if (dowm && BitmapPanel.DrawRect.Contains(currentPos))
                {
                    if (CreateNewRect)
                    {
                        drawRect = new Rect(MouseDownPos, currentPos);
                        BitmapPanel.SetRect(drawRect);
                        BitmapPanel.RectDraw();
                    }
                    else
                    {
                        BitmapPanel.RectMouseMove(currentPos);
                        drawRect = BitmapPanel.GetClientRect();
                    }
                    drawRect = new Rect(drawRect.X / scale, drawRect.Y / scale, drawRect.Width / scale, drawRect.Height / scale);
                }
            }
        }

        private void BitmapPanel_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (scanViwerViewModel.IsShowRect)
            {
                Point clickPoint = e.GetPosition(BitmapPanel);
                if (BitmapPanel.RectMouseLeftButtonDown(clickPoint))
                {
                    BitmapPanel.ContextMenu = contextMenu;
                }
                else
                {
                    BitmapPanel.ContextMenu = null;
                }
                e.Handled = true;
            }
        }

        private void Item_Click(object sender, RoutedEventArgs e)
        {
            scanViwerViewModel.AreaProcess(BitmapPanel.GetClientRect(), BitmapPanel.DrawRect);
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            scanViwerViewModel = DataContext as ScanViwerViewModel;
            contextMenu = new ContextMenu();
            item = new MenuItem() { Header = "开始识别" };
            item.Click += Item_Click;
            contextMenu.Items.Add(item);
        }

        private void UserControl_Unloaded(object sender, RoutedEventArgs e)
        {
            item.Click -= Item_Click;
        }

        private void UserControl_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Escape)
            {
                BitmapPanel.SetRect(new Rect(0,0,0,0));
                BitmapPanel.RectDraw();
                e.Handled = true;
            }
        }
    }
}