#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

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

namespace HeuristicLab.Core.Networks {
  [Item("ParameterizedPort", "An abstract base class for parameterized ports of optimization network nodes.")]
  [StorableClass]
  public abstract class ParameterizedPort : Port, IParameterizedPort {
    public override IEnumerable<INetworkItem> Children {
      get { return base.Children.Concat(Parameters.AsEnumerable<INetworkItem>()); }
    }

    [Storable]
    private PortParameterCollection parameters;
    protected PortParameterCollection Parameters {
      get { return parameters; }
    }
    private ReadOnlyKeyedItemCollection<string, IPortParameter> readOnlyParameters;
    IKeyedItemCollection<string, IPortParameter> IParameterizedPort.Parameters {
      get {
        if (readOnlyParameters == null) readOnlyParameters = parameters.AsReadOnly();
        return readOnlyParameters;
      }
    }

    [StorableConstructor]
    protected ParameterizedPort(bool deserializing) : base(deserializing) { }
    protected ParameterizedPort(ParameterizedPort original, Cloner cloner)
      : base(original, cloner) {
      parameters = cloner.Clone(original.parameters);
      foreach (var p in Parameters)
        p.Parent = this;
      readOnlyParameters = null;
      RegisterParametersEvents();
    }
    protected ParameterizedPort()
      : base("ParameterizedPort") {
      parameters = new PortParameterCollection();
      readOnlyParameters = null;
      RegisterParametersEvents();
    }
    protected ParameterizedPort(string name)
      : base(name) {
      parameters = new PortParameterCollection();
      readOnlyParameters = null;
      RegisterParametersEvents();
    }
    protected ParameterizedPort(string name, string description)
      : base(name, description) {
      parameters = new PortParameterCollection();
      readOnlyParameters = null;
      RegisterParametersEvents();
    }

    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      foreach (var p in Parameters)
        p.Parent = this;
      RegisterParametersEvents();
    }

    public event EventHandler InterfaceChanged;
    protected virtual void OnInterfaceChanged() {
      var handler = InterfaceChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    #region Parameters Events
    protected virtual void RegisterParametersEvents() {
      parameters.ItemsAdded += Parameters_ItemsAdded;
      parameters.ItemsRemoved += Parameters_ItemsRemoved;
      parameters.ItemsReplaced += Parameters_ItemsReplaced;
      parameters.CollectionReset += Parameters_CollectionReset;
      foreach (var p in parameters)
        RegisterParameterEvents(p);
    }
    protected virtual void Parameters_ItemsAdded(object sender, Collections.CollectionItemsChangedEventArgs<IPortParameter> e) {
      foreach (var p in e.Items) {
        p.Parent = this;
        RegisterParameterEvents(p);
      }
      OnInterfaceChanged();
    }
    protected virtual void Parameters_ItemsRemoved(object sender, Collections.CollectionItemsChangedEventArgs<IPortParameter> e) {
      foreach (var p in e.Items) {
        p.Parent = null;
        DeregisterParameterEvents(p);
      }
      OnInterfaceChanged();
    }
    protected virtual void Parameters_ItemsReplaced(object sender, Collections.CollectionItemsChangedEventArgs<IPortParameter> e) {
      foreach (var p in e.OldItems) {
        p.Parent = null;
        DeregisterParameterEvents(p);
      }
      foreach (var p in e.Items) {
        p.Parent = this;
        RegisterParameterEvents(p);
      }
      OnInterfaceChanged();
    }
    protected virtual void Parameters_CollectionReset(object sender, Collections.CollectionItemsChangedEventArgs<IPortParameter> e) {
      foreach (var p in e.OldItems) {
        p.Parent = null;
        DeregisterParameterEvents(p);
      }
      foreach (var p in e.Items) {
        p.Parent = this;
        RegisterParameterEvents(p);
      }
      OnInterfaceChanged();
    }
    #endregion

    #region Parameter Events
    protected virtual void RegisterParameterEvents(IPortParameter parameter) {
      parameter.NameChanged += Parameter_NameChanged;
      parameter.TypeChanged += Parameter_TypeChanged;
    }
    protected virtual void DeregisterParameterEvents(IPortParameter parameter) {
      parameter.NameChanged -= Parameter_NameChanged;
      parameter.TypeChanged -= Parameter_TypeChanged;
    }
    protected virtual void Parameter_NameChanged(object sender, EventArgs e) {
      OnInterfaceChanged();
    }
    protected virtual void Parameter_TypeChanged(object sender, EventArgs e) {
      OnInterfaceChanged();
    }
    #endregion
  }
}