using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HeuristicLab.Core;
using HeuristicLab.Common;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Problems.MetaOptimization {
  // todo: check that at least 1 elements needs to be selected
  // todo: control creatable item types
  [StorableClass]
  public class CheckedValueConfigurationCollection : CheckedItemCollection<IValueConfiguration>, ICheckedValueConfigurationCollection {
    [Storable]
    private int minItemCount = 1;
    public int MinItemCount { 
      get { return minItemCount; } 
    }

    [Storable]
    protected IItemSet<IItem> validValues;
    public IItemSet<IItem> ValidValues {
      get { return validValues; }
    }

    public CheckedValueConfigurationCollection(IItemSet<IItem> validValues) {
      this.validValues = validValues;
      RegisterEvents();
    }
    public CheckedValueConfigurationCollection() {
      RegisterEvents();
    }
    [StorableConstructor]
    protected CheckedValueConfigurationCollection(bool deserializing) : base(deserializing) {
      RegisterEvents();
    }
    protected CheckedValueConfigurationCollection(CheckedValueConfigurationCollection original, Cloner cloner) : base(original, cloner) {
      this.minItemCount = original.MinItemCount;
      this.validValues = original.validValues;
      RegisterEvents();
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new CheckedValueConfigurationCollection(this, cloner);
    }
    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      RegisterEvents();
    }

    private void RegisterEvents() {
      this.ItemsRemoved += new Collections.CollectionItemsChangedEventHandler<IValueConfiguration>(CheckedValueConfigurationCollection_ItemsRemoved);
    }
    private void DeregisterEvents() {
      this.ItemsRemoved -= new Collections.CollectionItemsChangedEventHandler<IValueConfiguration>(CheckedValueConfigurationCollection_ItemsRemoved);
    }

    private void CheckedValueConfigurationCollection_ItemsRemoved(object sender, Collections.CollectionItemsChangedEventArgs<IValueConfiguration> e) {
      // auch collectionreset gehört berücksichtigt
      // funktioniert so nicht ganz, weil die view das hinzufügen nicht mitkriegt
      //if (this.Count < minItemCount) {
      //  foreach (var item in e.Items) {
      //    if (this.Count >= minItemCount)
      //      break;
      //    this.Add(item);
      //  }
      //}
    }
  }
}