using System.Windows;
using System.Windows.Input;
using Livia.Utility.DependencyInjection;
using Livia.ViewModels;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Livia.Views.Controls;

/// <summary>
/// Interaction logic for ImageRotationViewer.xaml
/// </summary>
public partial class ImageRotationViewerControl
{
    private readonly ILogger _logger;
    private Point? _initialMousePosition;
    private double _initialWindowCenterModifier;
    private double _initialWindowWidthModifier;

    public ImageRotationViewerControl()
    {
        InitializeComponent();
        _logger = ActivatorUtilities.GetServiceOrCreateInstance<ILogger>(ServiceProviderFactory.ServiceProvider);
    }

    private void OnPreviewMouseWheel(object sender, MouseWheelEventArgs e)
    {
        if (DataContext is not ImageRotationViewerControlViewModel viewModel)
            return;

        if (e.Delta < 0)
        {
            viewModel.PrevImage();
        }
        else
        {
            viewModel.NextImage();
        }
        e.Handled = true;
    }

    private void DefaultWindowLevelButtonClick(object sender, RoutedEventArgs e)
    {
        if (DataContext is not ImageRotationViewerControlViewModel viewModel)
            return;

        viewModel.SetDefaultWindowLevel();
    }

    private void OnPreviewMouseDown(object sender, MouseButtonEventArgs e)
    {
        //requires left ctrl
        if (!Keyboard.IsKeyDown(Key.LeftCtrl))
            return;

        if (DataContext is not ImageRotationViewerControlViewModel viewModel)
            return;

        if (!viewModel.StructureImageSeries.WindowCenterModifiable)
            return;

        //set cursor
        Cursor = Cursors.Cross;
        _initialMousePosition = e.GetPosition(this);
        _initialWindowCenterModifier = viewModel.WindowCenterModifier;
        _initialWindowWidthModifier = viewModel.WindowWidthModifier;
        _logger.LogInformation("Mouse Down, WindowCenterModifier = {wc}, WindowWidthModifier = {ww}", _initialWindowCenterModifier, _initialWindowWidthModifier);
    }

    private void OnPreviewMouseUp(object sender, MouseButtonEventArgs e)
    {
        _initialMousePosition = null;
        //reset cursor
        Cursor = Cursors.Arrow;
    }

    private void OnMouseMove(object sender, MouseEventArgs e)
    {
        if (DataContext is not ImageRotationViewerControlViewModel viewModel)
            return;

        if (_initialMousePosition == null)
            return;

        Vector delta = _initialMousePosition.Value - e.GetPosition(this);
        Size size = RenderSize;

        double xDelta = delta.X / size.Width;
        double yDelta = delta.Y / size.Height;

        viewModel.WindowWidthModifier = _initialWindowWidthModifier - xDelta;
        viewModel.WindowCenterModifier = _initialWindowCenterModifier + yDelta;
        
        //_logger.LogInformation("Mouse move,dx = {x}, dy = {y}", xDelta, yDelta);
    }

    private void OnMouseLeave(object sender, MouseEventArgs e)
    {
        _initialMousePosition = null;
        //reset cursor
        Cursor = Cursors.Arrow;
    }

    private void OnPreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (DataContext is not ImageRotationViewerControlViewModel viewModel)
            return;

        // ReSharper disable once ConvertIfStatementToSwitchStatement
        if (e.Key is Key.W or Key.Up)
        {
            viewModel.NextImage();
        }
        else if (e.Key is Key.S or Key.Down)
        {
            viewModel.PrevImage();
        }

        Focus();
    }

    private void OnMouseEnter(object sender, MouseEventArgs e)
    {
        if (Application.Current.Windows.OfType<SettingsWindow>().Any())
        {
            return;
        }

        Focus();
    }
}