using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.ObjectModel;
using Aiwaz.Contracts;
using System.Collections.Specialized;
using System.Windows.Controls;
using System.Windows.Media;
using System.Reflection;
using System.IO;
using System.Windows.Media.Imaging;

namespace Aiwaz.Editor.ViewModels
{
    public class ResourceViewModel : ViewModelBase
    {
        private bool creating;

        public IResource Resource;

        public string DisplayName
        {
            get
            {
                return Resource.WellKnownName;
            }
            set
            {
                Resource.WellKnownName = value;
            }
        }

        public ImageSource DisplayIcon
        {
            get
            {
                var stream = File.OpenRead("Resources/icon.png");
                BitmapImage bitmap = new BitmapImage();
                bitmap.BeginInit();
                bitmap.StreamSource = stream;
                bitmap.EndInit();
                return bitmap;
            }
        }

        private ObservableCollection<ResourceViewModel> nodes;
        public ObservableCollection<ResourceViewModel> Nodes
        {
            get
            {
                if (nodes == null)
                {
                    nodes = new ObservableCollection<ResourceViewModel>();
                    nodes.CollectionChanged += new NotifyCollectionChangedEventHandler(nodes_CollectionChanged);
                }
                return nodes;
            }
            set
            {
                if (nodes != value)
                {
                    nodes = value;
                    OnPropertyChanged("Nodes");
                }
            }
        }

        void nodes_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            if (creating)
                return;

            if (e.Action == NotifyCollectionChangedAction.Add)
            {
                foreach (ResourceViewModel newItem in e.NewItems)
                {
                    Resource.Children.Insert(e.NewStartingIndex, newItem.Resource);
                }
            }
            else if (e.Action == NotifyCollectionChangedAction.Remove)
            {
                foreach (ResourceViewModel oldItem in e.OldItems)
                {
                    Resource.Children.Remove(oldItem.Resource);
                }
            }
            OnPropertyChanged("Nodes");
        }

        public ResourceViewModel(IResource resource)
        {
            this.Resource = resource;

            creating = true;
            if (resource.Children != null)
                foreach (var child in resource.Children)
                {
                    Nodes.Add(new ResourceViewModel(child));
                }
            creating = false;
            OnPropertyChanged("Nodes");
        }
    }
}