using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using HEAL.Attic;
using HeuristicLab.Collections;
using HeuristicLab.Core;

namespace HeuristicLab.JsonInterface {
  public class ItemCollectionConverter : BaseConverter {
    public override int Priority => 5;

    public override bool CanConvertType(Type t) =>
      t.GetInterfaces().Any(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IItemCollection<>));

    public override IJsonItem Extract(IItem value, IJsonItemConverter root) {
      var collection = (dynamic)value;
      var item = new ListJsonItem();
      IList<IJsonItem> valueItems = new List<IJsonItem>();

      foreach(IItem i in collection) {
        var tmp = root.Extract(i, root);
        valueItems.Add(tmp);
      }
      if (valueItems.Count > 0) {
        var targetType = valueItems.First().GetType();
        item.TargetTypeGUID = StorableTypeAttribute.GetStorableTypeAttribute(targetType).Guid.ToString();
      }

      item.Value = valueItems.ToArray();
      return item;
    }

    public override void Inject(IItem item, IJsonItem data, IJsonItemConverter root) {
      var collection = (dynamic)item;
      var listItem = data as ListJsonItem;
      var genericType = item.GetType().GetGenericArguments().First();

      foreach (var i in listItem.Value) {
        var tmp = Instantiate(genericType);
        if (data.Active) {
          i.Active = true;
          root.Inject(tmp, i, root);
          collection.Add((dynamic)tmp);
        }
      }
    }
  }
}