using System.Collections.Generic;
using System.Linq;
using JD.Asset;
using JD.Kernel.Classes;
using TeaBox;

namespace JD.AssetBrowser
{
    public class AssetBrowserContext : Singleton<AssetBrowserContext>
    {
        private IEnumerable<IAsset> _selectedAssets = new List<IAsset>();

        public IAsset Selection
        {
            get
            {
                return SelectedAssets?.FirstOrDefault();
            }
            set
            {
                SelectedAssets = new List<IAsset> {value};
            }
        }

        public IEnumerable<IAsset> SelectedAssets
        {
            get
            {
                return _selectedAssets;
            }

            set
            {
                if (Equals(value, _selectedAssets))
                {
                    return;
                }

                _selectedAssets = value;
                SelectionChanged?.Invoke();
            }
        }

        public delegate void SelectionChangedEventHandler();

        public event SelectionChangedEventHandler SelectionChanged;
    }
}