using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
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;
using Tango.SharedUI.Helpers;

namespace Tango.MachineStudio.Common.Controls
{
    /// <summary>
    /// Represents an MDI-style container
    /// </summary>
    /// <seealso cref="System.Windows.Controls.UserControl" />
    /// <seealso cref="System.Windows.Markup.IComponentConnector" />
    /// <seealso cref="System.Windows.Markup.IStyleConnector" />
    public partial class MdiContainerControl : UserControl
    {
        private const int MIN_SIZE = 200;

        public MdiContainerControl()
        {
            InitializeComponent();
        }

        public IEnumerable ItemsSource
        {
            get { return (IEnumerable)GetValue(ItemsSourceProperty); }
            set { SetValue(ItemsSourceProperty, value); }
        }
        public static readonly DependencyProperty ItemsSourceProperty =
            DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(MdiContainerControl), new PropertyMetadata(null));

        private void OnControlDragging(object sender, DragDeltaEventArgs e)
        {
            var mdiControl = GetSenderTag<MdiChild>(sender);
            mdiControl.Location = new Point(mdiControl.Location.X + e.HorizontalChange, mdiControl.Location.Y + e.VerticalChange);
            FitCanvas();
        }

        private T GetSenderTag<T>(object sender) where T : class
        {
            return (T)((sender as FrameworkElement).Tag);
        }

        private void FitCanvas()
        {
            Canvas canvas = GetCanvas();
            canvas.Width = canvas.Children.OfType<FrameworkElement>().Max(x => Canvas.GetLeft(x) + x.ActualWidth);
            canvas.Height = canvas.Children.OfType<FrameworkElement>().Max(x => Canvas.GetTop(x) + x.ActualHeight);
        }

        private Canvas GetCanvas()
        {
            return itemsControl.FindChild<Canvas>("canvas");
        }

        private void OnControlMouseDown(object sender, MouseButtonEventArgs e)
        {
            Canvas.SetZIndex(sender as FrameworkElement, GetCanvas().Children.OfType<FrameworkElement>().Max(x => Canvas.GetZIndex(x) + 1));
        }

        private void OnControlSizeRight(object sender, DragDeltaEventArgs e)
        {
            var mdiControl = GetSenderTag<MdiChild>(sender);
            if (double.IsNaN(mdiControl.View.Width)) mdiControl.View.Width = mdiControl.View.ActualWidth;
            if (mdiControl.View.Width + e.HorizontalChange > MIN_SIZE) mdiControl.View.Width += e.HorizontalChange;
        }

        private void OnControlSizeBottom(object sender, DragDeltaEventArgs e)
        {
            var mdiControl = GetSenderTag<MdiChild>(sender);
            if (double.IsNaN(mdiControl.View.Height)) mdiControl.View.Height = mdiControl.View.ActualHeight;
            if (mdiControl.View.Height + e.VerticalChange > MIN_SIZE) mdiControl.View.Height += e.VerticalChange;
        }

        private void OnControlResize(object sender, DragDeltaEventArgs e)
        {
            var mdiControl = GetSenderTag<MdiChild>(sender);

            if (double.IsNaN(mdiControl.View.Height)) mdiControl.View.Height = mdiControl.View.ActualHeight;
            if (double.IsNaN(mdiControl.View.Width)) mdiControl.View.Width = mdiControl.View.ActualWidth;

            if (mdiControl.View.Height + e.VerticalChange > MIN_SIZE) mdiControl.View.Height += e.VerticalChange;
            if (mdiControl.View.Width + e.HorizontalChange > MIN_SIZE) mdiControl.View.Width += e.HorizontalChange;
        }

        private void OnControlClosed(object sender, RoutedEventArgs e)
        {
            (ItemsSource as IList).Remove(GetSenderTag<MdiChild>(sender));
        }
    }
}