using System;
using System.Collections.Generic;
using System.Linq;
using Xamarin.Forms;

namespace comal.timesheets
{
    
    public class ExpanderViewItem
    {
        public String Description { get; set; }
        public bool Selected { get; set; }
    }
    
    public class ExpanderViewGroup
    {
        
        public String Description { get; set; }
        
        public ImageSource Image { get; set; }

        private List<ExpanderViewItem> _items = new List<ExpanderViewItem>();

        public ExpanderViewItem[] Items => _items.ToArray();

        public ExpanderViewGroup AddItem(ExpanderViewItem item)
        {
            _items.Add(item);
            return this;
        }

        public void DeleteItem(ExpanderViewItem item)
        {
            if (_items.Contains(item))
                _items.Remove(item);
        }

        public void Clear() => _items.Clear();

    }
    
    
    public class ExpanderViewData
    {
        private List<ExpanderViewGroup> _groups = new List<ExpanderViewGroup>();

        public ExpanderViewGroup[] Groups => _groups.ToArray();

        public ExpanderViewGroup AddGroup(ExpanderViewGroup group)
        {
            _groups.Add(group);
            return group;
        }
        
        public void DeleteGroup(ExpanderViewGroup group)
        {
            if (_groups.Contains(group))
                _groups.Remove(group);
        }

        public void Clear() => _groups.Clear();

        public ExpanderViewItem[] SelectedItems
        {
            get
            {
                List<ExpanderViewItem> results = new List<ExpanderViewItem>();
                foreach (var group in Groups)
                    results.AddRange(group.Items.Where(x => x.Selected));
                return results.ToArray();
            }
        }

    }
}