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

namespace comal.timesheets
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class SelectionPage 
    {
        private SelectionPageMode _mode;
        private Action<MobileGridColumns> _configure;
        private Func<bool,object> _refresh;
        private Action<object[]> _selected;
        
        public SelectionPage(
            String title, 
            SelectionPageMode mode, 
            Action<MobileGridColumns> configure,
            Func<bool,object> refresh, 
            Action<object[]> selected)
        {

            _mode = mode;
            _configure = configure;
            _refresh = refresh;
            _selected = selected;
            
            InitializeComponent();
            
            
            Title = title;

            _selection.Mode = mode;
            
            if (_mode != SelectionPageMode.Immediate)
            {
                ToolbarItems.Clear();
                ToolbarItems.Add(new ToolbarItem("Select", null, DoSelectItems));
            }
            
            

        }

        protected override void OnAppearing()
        {
            _selection.Load();
            base.OnAppearing();
        }


        private void DoSelectItems()
        {
            _selected?.Invoke(_selection.SelectedItems);
            Navigation.PopAsync();
        }

        private void _selection_OnConfigureColumns(object sender, SelectionViewConfigureArgs args)
        {
            _configure?.Invoke(args.Columns);
        }

        private object _selection_OnRefresh(object sender, SelectionViewRefreshArgs args)
        {
            return _refresh?.Invoke(false);
        }

        private void _selection_OnSelectionChanged(object sender, SelectionViewSelectionChangedArgs args)
        {
            if (_mode == SelectionPageMode.Immediate)
                DoSelectItems();
        }
    }
}