using System;
using Android.Content;
using Android.Support.V4.Widget;
using Android.Text;
using Android.Views;
using Android.Views.InputMethods;
using Android.Widget;
using Java.Lang;

namespace Xamarin.Forms.Platform.Android
{
	public sealed class EntryCellView : LinearLayout, ITextWatcher, global::Android.Views.View.IOnFocusChangeListener, TextView.IOnEditorActionListener, INativeElementView
	{
		public const double DefaultMinHeight = 55;

		readonly Cell _cell;
		readonly TextView _label;

		Color _labelTextColor;
		string _labelTextText;

		public EntryCellView(Context context, Cell cell) : base(context)
		{
			_cell = cell;
			SetMinimumWidth((int)context.ToPixels(50));
			SetMinimumHeight((int)context.ToPixels(85));
			Orientation = Orientation.Horizontal;

			var padding = (int)context.ToPixels(8);
			SetPadding((int)context.ToPixels(15), padding, padding, padding);

			_label = new TextView(context);
			TextViewCompat.SetTextAppearance(_label, global::Android.Resource.Style.TextAppearanceSmall);

			var layoutParams = new LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent) { Gravity = GravityFlags.CenterVertical };
			using (layoutParams)
				AddView(_label, layoutParams);

			EditText = new EntryCellEditText(context);
			EditText.AddTextChangedListener(this);
			EditText.OnFocusChangeListener = this;
			EditText.SetOnEditorActionListener(this);
			EditText.ImeOptions = ImeAction.Done;
			EditText.BackButtonPressed += OnBackButtonPressed;
			//editText.SetBackgroundDrawable (null);
			layoutParams = new LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.WrapContent) { Width = 0, Weight = 1, Gravity = GravityFlags.FillHorizontal | GravityFlags.Center };
			using (layoutParams)
				AddView(EditText, layoutParams);
		}

		public Action EditingCompleted { get; set; }

		public EntryCellEditText EditText { get; }

		public Action<bool> FocusChanged { get; set; }

		public string LabelText
		{
			get { return _labelTextText; }
			set
			{
				if (_labelTextText == value)
					return;

				_labelTextText = value;
				_label.Text = value;
			}
		}

		public Action<string> TextChanged { get; set; }

		public Element Element
		{
			get { return _cell; }
		}

		bool TextView.IOnEditorActionListener.OnEditorAction(TextView v, ImeAction actionId, KeyEvent e)
		{
			if (actionId == ImeAction.Done)
			{
				OnKeyboardDoneButtonPressed(EditText, EventArgs.Empty);
				EditText.ClearFocus();
				v.HideKeyboard();
			}

			// Fire Completed and dismiss keyboard for hardware / physical keyboards
			if (actionId == ImeAction.ImeNull && e.KeyCode == Keycode.Enter)
			{
				OnKeyboardDoneButtonPressed(EditText, EventArgs.Empty);
				EditText.ClearFocus();
				v.HideKeyboard();
			}

			return true;
		}

		void IOnFocusChangeListener.OnFocusChange(global::Android.Views.View view, bool hasFocus)
		{
			Action<bool> focusChanged = FocusChanged;
			if (focusChanged != null)
				focusChanged(hasFocus);
		}

		void ITextWatcher.AfterTextChanged(IEditable s)
		{
		}

		void ITextWatcher.BeforeTextChanged(ICharSequence s, int start, int count, int after)
		{
		}

		void ITextWatcher.OnTextChanged(ICharSequence s, int start, int before, int count)
		{
			Action<string> changed = TextChanged;
			if (changed != null)
				changed(s != null ? s.ToString() : null);
		}

		public void SetLabelTextColor(Color color, int defaultColorResourceId)
		{
			if (_labelTextColor == color)
				return;

			_labelTextColor = color;
			_label.SetTextColor(color.ToAndroid(defaultColorResourceId, _label.Context));
		}

		public void SetRenderHeight(double height)
		{
			SetMinimumHeight((int)Context.ToPixels(height == -1 ? DefaultMinHeight : height));
		}

		void OnBackButtonPressed(object sender, EventArgs e)
		{
			// TODO Clear focus
		}

		void OnKeyboardDoneButtonPressed(object sender, EventArgs e)
		{
			// TODO Clear focus
			Action editingCompleted = EditingCompleted;
			if (editingCompleted != null)
				editingCompleted();
		}
	}
}