using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace comal.timesheets
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class StringList : ContentView
    {
        public StringList()
        {
            InitializeComponent();
        }

        private void AddBtn_Clicked(object sender, EventArgs e)
        {
            stackLayout.Children.Add(
                CreateEditor()
                );
        }

        private DeleteableEditor CreateEditor(string text = "")
        {
            DeleteableEditor editor = new DeleteableEditor(text);
            editor.OnEditorDeleted += () => { stackLayout.Children.Remove(editor); };
            return editor;
        }

        public void LoadList(string[] items)
        {
            foreach (var item in items)
            {
                stackLayout.Children.Add(CreateEditor(item));
            }
        }

        public string[] SaveItems()
        {
            List<string> items = new List<string>();
            foreach (DeleteableEditor entry in stackLayout.Children)
            {
                if (!string.IsNullOrEmpty(entry.Text))
                    items.Add(entry.Text);
            }
            return items.ToArray();
        }
    }

    public delegate void EditorDeleted();

    public class DeleteableEditor : Grid
    {
        public event EditorDeleted OnEditorDeleted;
        public string Text { get; set; }
        public DeleteableEditor(string text = "")
        {
            Text = text;
            Setup();
        }

        private void Setup()
        {
            ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Auto) });

            var edt = new Entry();
            edt.Text = Text;
            edt.FontSize = 16;
            edt.TextChanged += (sender, e) =>
            {
                Text = edt.Text;
            };
            Grid.SetColumn(edt, 0);

            Image img = new Image { Source = "closee.png", HeightRequest = 20, WidthRequest = 20, Margin = new Thickness(2,2,10,2) };
            img.GestureRecognizers.Add(new TapGestureRecognizer { Command = new Command(Close) });
            Grid.SetColumn(img, 1);

            Children.Add(edt);
            Children.Add(img);
        }


        private void Close(object obj)
        {
            OnEditorDeleted?.Invoke();
        }
    }
}