using System;
using Android.Widget;
using Android.App;
using System.Collections.Generic;
using Android.Views;
using System.Collections;
using System.Linq;
using Xamarin.Forms.Controls;
using Xamarin.Forms.Platform.Android;
using Xamarin.Forms;
using Xamarin.Forms.ControlGallery.Android;
using Android.Graphics.Drawables;
using System.Threading.Tasks;
using Android.Content;
using Android.Runtime;
using Android.Util;
using AButton = Android.Widget.Button;

[assembly: ExportRenderer (typeof (Bugzilla31395.CustomContentView), typeof (CustomContentRenderer))]
[assembly: ExportRenderer (typeof (NativeListView), typeof (NativeListViewRenderer))]
[assembly: ExportRenderer (typeof (NativeListView2), typeof (NativeAndroidListViewRenderer))]
[assembly: ExportRenderer (typeof (NativeCell), typeof (NativeAndroidCellRenderer))]

namespace Xamarin.Forms.ControlGallery.Android
{
	public class NativeListViewRenderer : ViewRenderer<NativeListView, global::Android.Widget.ListView>
	{
		public NativeListViewRenderer ()
		{
		}

		protected override void OnElementChanged (ElementChangedEventArgs<NativeListView> e)
		{
			base.OnElementChanged (e);

			if (Control == null) {
				SetNativeControl (new global::Android.Widget.ListView (Forms.Context));
			}

			if (e.OldElement != null) {
				// unsubscribe
				Control.ItemClick -= Clicked;
			}

			if (e.NewElement != null) {
				// subscribe

				Control.Adapter = new NativeListViewAdapter (Forms.Context as Activity, e.NewElement);
				Control.ItemClick += Clicked;
			}
		}

		void Clicked (object sender, AdapterView.ItemClickEventArgs e) {
			Element.NotifyItemSelected (Element.Items.ToList()[e.Position]);
		}

		protected override void OnElementPropertyChanged (object sender, System.ComponentModel.PropertyChangedEventArgs e)
		{
			base.OnElementPropertyChanged (sender, e);
			if (e.PropertyName == NativeListView.ItemsProperty.PropertyName) {
				// update the Items list in the UITableViewSource

				Control.Adapter = new NativeListViewAdapter (Forms.Context as Activity, Element);
			}
		}
	}

	public class NativeListViewAdapter: BaseAdapter<string> {
		readonly Activity _context;
		IList<string> _tableItems = new List<string>();

		public IEnumerable<string> Items {
			set { 
				_tableItems = value.ToList();
			}
		}

		public NativeListViewAdapter(Activity context, NativeListView view)
		{
			_context = context;
			_tableItems = view.Items.ToList();
		}

		public override string this[int position]
		{
			get
			{ 
				return _tableItems[position];
			}
		}

		public override long GetItemId(int position)
		{
			return position;
		}

		public override int Count
		{
			get { return _tableItems.Count; }
		}

		public override global::Android.Views.View GetView(int position, global::Android.Views.View convertView, ViewGroup parent)
		{
			// Get our object for this position
			var item = _tableItems[position];

			var view = convertView;
			if (view == null) { // no view to re-use, create new
				view = _context.LayoutInflater.Inflate(global::Android.Resource.Layout.SimpleListItem1, null);
			}

			view.FindViewById<TextView> (global::Android.Resource.Id.Text1).Text = item;

			return view;
		}
	}

	/// <summary>
	/// This renderer uses a view defined in /Resources/Layout/NativeAndroidCell.axml
	/// as the cell layout
	/// </summary>
	public class NativeAndroidCellRenderer : ViewCellRenderer
	{
		public NativeAndroidCellRenderer ()
		{
		}

		protected override global::Android.Views.View GetCellCore (Cell item, global::Android.Views.View convertView, ViewGroup parent, Context context)
		{
			var x = (NativeCell)item;

			var view = convertView;

						if (view == null) {// no view to re-use, create new
							view = (context as Activity).LayoutInflater.Inflate (Resource.Layout.NativeAndroidCell, null);
						} else { // re-use, clear image
							// doesn't seem to help
							//view.FindViewById<ImageView> (Resource.Id.Image).Drawable.Dispose ();
						}
			
						view.FindViewById<TextView>(Resource.Id.Text1).Text = x.Name;
						view.FindViewById<TextView>(Resource.Id.Text2).Text = x.Category;

						// grab the old image and dispose of it
						// TODO: optimize if the image is the *same* and we want to just keep it
						if (view.FindViewById<ImageView> (Resource.Id.Image).Drawable != null) {
							using (var image = view.FindViewById<ImageView> (Resource.Id.Image).Drawable as BitmapDrawable) {
								if (image != null) {
									if (image.Bitmap != null) {
										//image.Bitmap.Recycle ();
										image.Bitmap.Dispose ();
									}
								}
							}
						}
			
						// If a new image is required, display it
						if (!string.IsNullOrWhiteSpace (x.ImageFilename)) {
							context.Resources.GetBitmapAsync (x.ImageFilename).ContinueWith ((t) => {
								var bitmap = t.Result;
								if (bitmap != null) {
									view.FindViewById<ImageView> (Resource.Id.Image).SetImageBitmap (bitmap);
									bitmap.Dispose ();
								}
							}, TaskScheduler.FromCurrentSynchronizationContext() );
			
						} else {
							// clear the image
							view.FindViewById<ImageView> (Resource.Id.Image).SetImageBitmap (null);
						}

			return view;
		}
	}

	public class NativeAndroidListViewRenderer : ViewRenderer<NativeListView2, global::Android.Widget.ListView>
	{
		public NativeAndroidListViewRenderer ()
		{
		}

		protected override void OnElementChanged (ElementChangedEventArgs<NativeListView2> e)
		{
			base.OnElementChanged (e);

			if (Control == null) {
				SetNativeControl (new global::Android.Widget.ListView (Forms.Context));
			}

			if (e.OldElement != null) {
				// unsubscribe
				Control.ItemClick -= Clicked;
			}

			if (e.NewElement != null) {
				// subscribe
				Control.Adapter = new NativeAndroidListViewAdapter (Forms.Context as Activity, e.NewElement);
				Control.ItemClick += Clicked;
			}
		}

		//		public override void Layout (int l, int t, int r, int b)
		//		{
		//			base.Layout (l, t, r, b);
		//		}

		void Clicked (object sender, AdapterView.ItemClickEventArgs e) {
			Element.NotifyItemSelected (Element.Items.ToList()[e.Position]);
		}

		protected override void OnElementPropertyChanged (object sender, System.ComponentModel.PropertyChangedEventArgs e)
		{
			base.OnElementPropertyChanged (sender, e);
			if (e.PropertyName == NativeListView.ItemsProperty.PropertyName) {
				// update the Items list in the UITableViewSource

				Control.Adapter = new NativeAndroidListViewAdapter (Forms.Context as Activity, Element);
			}
		}
	}

	/// <summary>
	/// This adapter uses a view defined in /Resources/Layout/NativeAndroidListViewCell.axml
	/// as the cell layout
	/// </summary>
	public class NativeAndroidListViewAdapter : BaseAdapter<DataSource> {
		readonly Activity _context;
		IList<DataSource> _tableItems = new List<DataSource>();

		public IEnumerable<DataSource> Items {
			set { 
				_tableItems = value.ToList();
			}
		}

		public NativeAndroidListViewAdapter(Activity context, NativeListView2 view)
		{
			_context = context;
			_tableItems = view.Items.ToList();
		}

		public override DataSource this[int position]
		{
			get
			{ 
				return _tableItems[position];
			}
		}

		public override long GetItemId(int position)
		{
			return position;
		}

		public override int Count
		{
			get { return _tableItems.Count; }
		}

		public override global::Android.Views.View GetView(int position, global::Android.Views.View convertView, ViewGroup parent)
		{
			var item = _tableItems[position];

			var view = convertView;
			if (view == null) {// no view to re-use, create new
				view = _context.LayoutInflater.Inflate (Resource.Layout.NativeAndroidListViewCell, null);
			} else { // re-use, clear image
				// doesn't seem to help
				//view.FindViewById<ImageView> (Resource.Id.Image).Drawable.Dispose ();
			}
			view.FindViewById<TextView>(Resource.Id.Text1).Text = item.Name;
			view.FindViewById<TextView>(Resource.Id.Text2).Text = item.Category;

			// grab the old image and dispose of it
			// TODO: optimize if the image is the *same* and we want to just keep it
			if (view.FindViewById<ImageView> (Resource.Id.Image).Drawable != null) {
				using (var image = view.FindViewById<ImageView> (Resource.Id.Image).Drawable as BitmapDrawable) {
					if (image != null) {
						if (image.Bitmap != null) {
							//image.Bitmap.Recycle ();
							image.Bitmap.Dispose ();
						}
					}
				}
			}

			// If a new image is required, display it
			if (!string.IsNullOrWhiteSpace (item.ImageFilename)) {
				_context.Resources.GetBitmapAsync (item.ImageFilename).ContinueWith ((t) => {
					var bitmap = t.Result;
					if (bitmap != null) {
						view.FindViewById<ImageView> (Resource.Id.Image).SetImageBitmap (bitmap);
						bitmap.Dispose ();
					}
				}, TaskScheduler.FromCurrentSynchronizationContext());
			} else {
				// clear the image
				view.FindViewById<ImageView> (Resource.Id.Image).SetImageBitmap (null);
			}

			return view;
		}
	}
	public class CustomContentRenderer : ViewRenderer
	{
	}

    public class CustomNativeButton : AButton
    {
        public CustomNativeButton (IntPtr javaReference, JniHandleOwnership transfer) : base (javaReference, transfer)
        {
        }

        public CustomNativeButton (Context context) : base (context)
        {
        }

        public CustomNativeButton (Context context, IAttributeSet attrs) : base (context, attrs)
        {
        }

        public CustomNativeButton (Context context, IAttributeSet attrs, int defStyleAttr) : base (context, attrs, defStyleAttr)
        {
        }

        public CustomNativeButton (Context context, IAttributeSet attrs, int defStyleAttr, int defStyleRes) : base (context, attrs, defStyleAttr, defStyleRes)
        {
        }
    }

    public class CustomButtonRenderer : ButtonRenderer
    {
        protected override void OnElementChanged (ElementChangedEventArgs<Button> e)
        {
            if(Control == null) {
                CustomNativeButton b = new CustomNativeButton (Context);
                SetNativeControl (b);
            }

            base.OnElementChanged (e);
        }
    }
}