using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Input;
using System.Windows.Threading;

namespace WarframeClock
{
    /// <summary>
    /// Interaction logic for OverlayWindow.xaml
    /// </summary>
    public partial class OverlayWindow : OverlayWindowBase
    {
        private readonly OverlayWindowViewModel _vm;
        private readonly DispatcherTimer _updateTimer;

        public OverlayWindow(OverlayWindowViewModel vm)
        {
            InitializeComponent();
            DataContext = _vm = vm;

            _vm.PropertyChanged += OnVmPropertyChanged;
            _updateTimer = new DispatcherTimer(TimeSpan.FromMilliseconds(100), DispatcherPriority.Background,
                (_, __) => AdjustOverlay(), Dispatcher.CurrentDispatcher);
        }

        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);
            _updateTimer.Start();
        }

        protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
            _updateTimer.Stop();
            _vm.PropertyChanged -= OnVmPropertyChanged;
        }

        private void OnVmPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == nameof(OverlayWindowViewModel.Standalone) && _vm.Standalone)
            {
                (App.Current.MainWindow = new StandaloneOverlayWindow(_vm)).Show();
                Close();
            }
        }

        private Point _dragOriginalPosition;
        private bool _dragStarted;
        private Point _dragOffset;

        private void OverlayLabelOverlay_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (!_vm.SettingsMode)
                return;
            _dragStarted = true;
            _dragOriginalPosition = OverlayLabelOverlay.TranslatePoint(new Point(0, 0), this);
            _dragOffset = e.GetPosition(this);
            ((UIElement)sender).CaptureMouse();
        }

        private void OverlayLabelOverlay_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (!_vm.SettingsMode)
                return;
            if (_dragStarted)
            {
                ((UIElement)sender).ReleaseMouseCapture();
                _dragStarted = false;
            }
        }

        private void OverlayLabelOverlay_MouseMove(object sender, MouseEventArgs e)
        {
            if (!_vm.SettingsMode)
                return;
            if (_dragStarted)
            {
                var p = e.GetPosition(this);
                var newX = _dragOriginalPosition.X + p.X - _dragOffset.X;
                if (newX <= ActualWidth / 2)
                {
                    Settings.DockToX = Settings.AlignmentX.Left;
                    Settings.MarginX = newX;
                }
                else
                {
                    Settings.DockToX = Settings.AlignmentX.Right;
                    Settings.MarginX = ActualWidth - newX - OverlayLabelOverlay.ActualWidth;
                }
                var newY = _dragOriginalPosition.Y + p.Y - _dragOffset.Y;
                if (newY <= ActualHeight / 2)
                {
                    Settings.DockToY = Settings.AlignmentY.Top;
                    Settings.MarginY = newY;
                }
                else
                {
                    Settings.DockToY = Settings.AlignmentY.Bottom;
                    Settings.MarginY = ActualHeight - newY - OverlayLabelOverlay.ActualHeight;
                }

                _vm.RefreshPosition();
            }
        }
    }
}