source: branches/HeuristicLab.MetaOptimization/HeuristicLab.Problems.MetaOptimization/3.3/Encoding/ParameterConfigurations/ParameterConfiguration.cs @ 5267

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.PluginInfrastructure;
using System.Text;
using System.Reflection;
using HeuristicLab.Optimization;

namespace HeuristicLab.Problems.MetaOptimization {
  [StorableClass]
  public class ParameterConfiguration : Item, IParameterConfiguration, IStorableContent {
    public bool IsOptimizable {
      get { return true; }
    }

    [Storable]
    public string Filename { get; set; }

    [Storable]
    protected bool optimize;
    public bool Optimize {
      get { return optimize; }
      set {
        if (optimize != value) {
          optimize = value;
          if (optimize) {
            PopulateValueConfigurations();
          } else {
            this.ValueConfigurations.Clear();
          }
          OnOptimizeChanged();
          OnToStringChanged();
        }
      }
    }

    [Storable]
    protected string parameterName;
    public string ParameterName {
      get { return parameterName; }
      set {
        if (parameterName != value) {
          parameterName = value;
          OnToStringChanged();
        }
      }
    }

    [Storable]
    protected Type parameterDataType;
    public Type ParameterDataType {
      get { return this.parameterDataType; }
    }

    [Storable]
    protected Type[] validTypes;
    public Type[] ValidTypes {
      get { return validTypes; }
      protected set {
        if (this.validTypes != value) {
          this.validTypes = value;
        }
      }
    }

    [Storable]
    protected Type valueDataType;
    public Type ValueDataType {
      get { return valueDataType; }
      protected set { this.valueDataType = value; }
    }

    [Storable]
    protected ICheckedValueConfigurationCollection valueConfigurations;
    public ICheckedValueConfigurationCollection ValueConfigurations {
      get { return this.valueConfigurations; }
      protected set {
        if (this.valueConfigurations != value) {
          if (this.valueConfigurations != null) DeregisterValueConfigurationEvents();
          this.valueConfigurations = value;
          if (this.valueConfigurations != null) RegisterValueConfigurationEvents();
        }
      }
    }

    [Storable]
    private int actualValueConfigurationIndex = 0;
    public int ActualValueConfigurationIndex {
      get { return actualValueConfigurationIndex; }
      set { actualValueConfigurationIndex = value; }
    }

    [Storable]
    protected ConstrainedValue actualValue;
    public ConstrainedValue ActualValue {
      get { return actualValue; }
      set {
        if (actualValue != value) {
          DeregisterActualValueEvents();
          actualValue = value;
          RegisterActualValueEvents();
        }
      }
    }

    [Storable]
    protected bool isNullable;
    public bool IsNullable {
      get { return isNullable; }
      protected set {
        if (this.isNullable != value) {
          this.isNullable = value;
        }
      }
    }

    [Storable]
    protected IItemSet<IItem> validValues;

    #region Constructors and Cloning
    public ParameterConfiguration(string parameterName, IValueParameter valueParameter) {
      this.ParameterName = parameterName;
      this.parameterDataType = valueParameter.GetType();
      this.valueDataType = valueParameter.DataType;
      this.validValues = GetValidValues(valueParameter);
      this.validTypes = GetValidTypes(valueParameter).ToArray();
      this.IsNullable = valueParameter.ItemName.StartsWith("Optional");
      if (IsNullable) {
        validTypes = new List<Type>(validTypes) { typeof(NullValue) }.ToArray();
      }
      this.ValueConfigurations = new CheckedValueConfigurationCollection();
      this.ActualValue = new ConstrainedValue(
        valueParameter.Value != null ? (IItem)valueParameter.Value.Clone() : null, 
        valueParameter.DataType, 
        this.validValues != null ? new ItemSet<IItem>(this.validValues) : CreateValidValues(), 
        this.IsNullable);
      if (Optimize) {
        PopulateValueConfigurations();
      }
    }

    public ParameterConfiguration() { }
    [StorableConstructor]
    protected ParameterConfiguration(bool deserializing) { }
    protected ParameterConfiguration(ParameterConfiguration original, Cloner cloner)
      : base(original, cloner) {
      this.parameterName = original.ParameterName;
      this.parameterDataType = original.parameterDataType;
      this.valueDataType = original.ValueDataType;
      this.validValues = cloner.Clone(original.validValues);
      this.validTypes = original.validTypes.ToArray();
      this.valueConfigurations = cloner.Clone(original.ValueConfigurations);
      this.ActualValue = cloner.Clone(original.ActualValue);
      this.optimize = original.optimize;
      this.actualValueConfigurationIndex = original.actualValueConfigurationIndex;
      this.isNullable = original.isNullable;
      if (this.valueConfigurations != null) RegisterValueConfigurationEvents();
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new ParameterConfiguration(this, cloner);
    }
    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      if (this.valueConfigurations != null) RegisterValueConfigurationEvents();
    }
    #endregion

    private void RegisterValueConfigurationEvents() {
      this.ValueConfigurations.CheckedItemsChanged += new Collections.CollectionItemsChangedEventHandler<IValueConfiguration>(ValueConfigurations_CheckedItemsChanged);
      this.ValueConfigurations.ItemsAdded += new Collections.CollectionItemsChangedEventHandler<IValueConfiguration>(ValueConfigurations_ItemsAdded);
      this.ValueConfigurations.ItemsRemoved += new Collections.CollectionItemsChangedEventHandler<IValueConfiguration>(ValueConfigurations_ItemsRemoved);
    }

    private void DeregisterValueConfigurationEvents() {
      this.ValueConfigurations.CheckedItemsChanged -= new Collections.CollectionItemsChangedEventHandler<IValueConfiguration>(ValueConfigurations_CheckedItemsChanged);
      this.ValueConfigurations.ItemsAdded -= new Collections.CollectionItemsChangedEventHandler<IValueConfiguration>(ValueConfigurations_ItemsAdded);
      this.ValueConfigurations.ItemsRemoved -= new Collections.CollectionItemsChangedEventHandler<IValueConfiguration>(ValueConfigurations_ItemsRemoved);
    }

    private void RegisterActualValueEvents() {
      if (this.ActualValue != null) this.ActualValue.ToStringChanged += new EventHandler(ActualValue_ToStringChanged);
    }
    private void DeregisterActualValueEvents() {
      if (this.ActualValue != null) this.ActualValue.ToStringChanged -= new EventHandler(ActualValue_ToStringChanged);
    }

    private void PopulateValueConfigurations() {
      foreach (Type t in this.validTypes) {
        if (t == typeof(NullValue)) {
          this.ValueConfigurations.Add(new NullValueConfiguration());
        } else {
          IItem val;
          if (ActualValue.Value != null && ActualValue.ValueDataType == t) {
            val = (IItem)ActualValue.Value.Clone(); // use existing value for that type (if available)
          } else {
            val = CreateItem(t);
          }
          this.ValueConfigurations.Add(new ValueConfiguration(val, val.GetType()), true);
        }
      }
    }

    private IEnumerable<Type> GetValidTypes(IValueParameter parameter) {
      // in case of IOperator return empty list, otherwise hundreds of types would be returned. this mostly occurs for Successor which will never be optimized
      if (parameter.DataType == typeof(IOperator))
        return new List<Type>();

      if (IsSubclassOfRawGeneric(typeof(OptionalConstrainedValueParameter<>), parameter.GetType())) {
        var parameterValidValues = (IEnumerable)parameter.GetType().GetProperty("ValidValues").GetValue(parameter, new object[] { });
        return parameterValidValues.Cast<object>().Select(x => x.GetType());
      } else {
        return ApplicationManager.Manager.GetTypes(valueDataType, true);
      }
    }

    private IItemSet<IItem> GetValidValues(IValueParameter parameter) {
      if (IsSubclassOfRawGeneric(typeof(OptionalConstrainedValueParameter<>), parameter.GetType())) {
        var x = (IEnumerable)parameter.GetType().GetProperty("ValidValues").GetValue(parameter, new object[] { });
        return new ItemSet<IItem>(x.Cast<IItem>().Select(y => (IItem)y.Clone())); // cloning actually saves memory, because references to event-subscribers are removed
      } else {
        return null;
      }
    }

    public IItem CreateItem(Type type) {
      // no valid values; just instantiate
      if (validValues == null)
        return (IItem)Activator.CreateInstance(type);

      if (type == typeof(NullValue))
        return new NullValue();
      
      // copy value from ValidValues; this ensures that previously set ActualNames for a type are kept
      IItem value = this.validValues.Where(v => v.GetType() == type).SingleOrDefault();
      if (value != null) 
        return value;

      return null;
    }

    private ItemSet<IItem> CreateValidValues() {
      var validValues = new ItemSet<IItem>();
      foreach (Type t in this.validTypes) {
        try {
          var val = CreateItem(t);
          validValues.Add(val);
        }
        catch (MissingMethodException) { /* Constructor is missing, don't use those types */ }
      }
      return validValues;
    }

    private static bool IsSubclassOfRawGeneric(Type generic, Type toCheck) {
      while (toCheck != typeof(object)) {
        var cur = toCheck.IsGenericType ? toCheck.GetGenericTypeDefinition() : toCheck;
        if (generic == cur) {
          return true;
        }
        toCheck = toCheck.BaseType;
      }
      return false;
    }

    void ValueConfigurations_CheckedItemsChanged(object sender, Collections.CollectionItemsChangedEventArgs<IValueConfiguration> e) {
      OnToStringChanged();
    }
    void ValueConfigurations_ItemsRemoved(object sender, Collections.CollectionItemsChangedEventArgs<IValueConfiguration> e) {
      OnToStringChanged();
    }
    void ValueConfigurations_ItemsAdded(object sender, Collections.CollectionItemsChangedEventArgs<IValueConfiguration> e) {
      OnToStringChanged();
    }

    #region INamedItem Properties
    public virtual string Name {
      get { return ParameterName; }
      set { throw new NotSupportedException(); }
    }
    public virtual string Description {
      get { return base.ItemDescription; }
      set { throw new NotSupportedException(); }
    }
    public virtual bool CanChangeDescription {
      get { return false; }
    }
    public virtual bool CanChangeName {
      get { return false; }
    }
    public override string ItemDescription {
      //get { return parameter != null ? parameter.Description : base.ItemDescription; }
      get { return base.ItemDescription; }
    }
    public override System.Drawing.Image ItemImage {
      //get { return parameter != null ? parameter.ItemImage : base.ItemImage; }
      get { return base.ItemImage; }
    }
    public override string ItemName {
      //get { return parameter != null ?parameter.ItemName : base.ItemName; }
      get { return base.ItemName; }
    }
    #endregion

    #region Events
    void ActualValue_ToStringChanged(object sender, EventArgs e) {
      OnToStringChanged();
    }
    #endregion

    #region Event Handler
    public virtual event EventHandler NameChanged;
    protected virtual void OnNameChanged(object sender, EventArgs e) {
      var handler = NameChanged;
      if (handler != null) handler(sender, e);
    }

    public virtual event EventHandler<CancelEventArgs<string>> NameChanging;
    protected virtual void OnNameChanging(object sender, CancelEventArgs<string> e) {
      var handler = NameChanging;
      if (handler != null) handler(sender, e);
    }

    public virtual event EventHandler DescriptionChanged;
    protected virtual void OnDescriptionChanged(object sender, EventArgs e) {
      var handler = DescriptionChanged;
      if (handler != null) handler(sender, e);
    }

    public virtual event EventHandler IsOptimizableChanged;
    private void OnIsOptimizableChanged() {
      var handler = IsOptimizableChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public virtual event EventHandler OptimizeChanged;
    protected virtual void OnOptimizeChanged() {
      var handler = OptimizeChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    #endregion

    public override string ToString() {
      if (Optimize) {
        return string.Format("{0}: (Optimize: {1})", ParameterName, ValueConfigurations.CheckedItems.Count());
      } else {
        return string.Format("{0}: {1}", ParameterName, ActualValue.Value);
      }
    }

    public string ParameterInfoString {
      get {
        StringBuilder sb = new StringBuilder();
        if (this.Optimize) {
          sb.Append(string.Format("{0}: {1}", parameterName, this.ActualValue.Value != null ? this.ActualValue.Value.ToString() : "null"));

          if (this.ActualValue.Value is IParameterizedItem) {
            string subParams = this.ValueConfigurations.CheckedItems.ElementAt(actualValueConfigurationIndex).ParameterInfoString;
            if (!string.IsNullOrEmpty(subParams)) {
              sb.Append(" (");
              sb.Append(subParams);
              sb.Append(")");
            }
          }
        }
        return sb.ToString();
      }
    }

    public static IParameterConfiguration Create(IParameterizedNamedItem parent, IParameter parameter) {
      if (parameter is IValueParameter) {
        IValueParameter valueParameter = parameter as IValueParameter;
        return new ParameterConfiguration(parameter.Name, valueParameter);
      }
      return null;
    }

    public void Parameterize(IValueParameter parameter) {
      if (Optimize) {
        if (this.ActualValue.Value is IParameterizedItem) {
          this.ValueConfigurations.CheckedItems.ElementAt(actualValueConfigurationIndex).Parameterize((IParameterizedItem)this.ActualValue.Value);
        }
      }
      var clonedValue = this.ActualValue.Value != null ? (IItem)this.ActualValue.Value.Clone() : null;
      AdaptValidValues(parameter, clonedValue);
      parameter.Value = clonedValue;
    }

    /// <summary>
    /// Adds value to the ValidValues of the parameter if they don't contain the value
    /// </summary>
    private void AdaptValidValues(IValueParameter parameter, IItem value) {
      // this requires some tricky reflection, because the type is unknown at runtime so parameter.ValidValues cannot be casted to Collection<?>
      if (IsSubclassOfRawGeneric(typeof(OptionalConstrainedValueParameter<>), parameter.GetType())) {
        var validValues = parameter.GetType().GetProperty("ValidValues").GetValue(parameter, new object[] { });
        Type validValuesType = validValues.GetType();

        var containsMethod = validValuesType.GetMethod("Contains");
        if (!(bool)containsMethod.Invoke(validValues, new object[] { value })) {
          var addMethod = validValuesType.GetMethod("Add");
          addMethod.Invoke(validValues, new object[] { value });
        }
      }
    }

    public void Randomize(IRandom random) {
      if (Optimize) {
        foreach (var vc in this.ValueConfigurations.CheckedItems) {
          vc.Randomize(random);
        }
        actualValueConfigurationIndex = random.Next(ValueConfigurations.CheckedItems.Count());
        this.ActualValue = this.ValueConfigurations.CheckedItems.ElementAt(actualValueConfigurationIndex).ActualValue;
      }
    }

    public void Mutate(IRandom random, MutateDelegate mutate, ParameterConfigurationManipulator pcmanip) {
      if (Optimize) {
        foreach (IValueConfiguration vc in this.ValueConfigurations.CheckedItems) {
          vc.Mutate(random, mutate, pcmanip);
        }
        mutate(random, this, pcmanip);
      }
    }

    public void Cross(IRandom random, IOptimizable other, CrossDelegate cross, ParameterConfigurationCrossover pccross) {
      if (Optimize) {
        IParameterConfiguration otherPc = (IParameterConfiguration)other;
        for (int i = 0; i < this.ValueConfigurations.Count; i++) {
          cross(random, other, pccross);
          //this.ValueConfigurations.ElementAt(i).Cross(otherPc.ValueConfigurations.ElementAt(i), random);
        }
        //if (random.NextDouble() > 0.5) {
        //  actualValueConfigurationIndex = ((ParameterConfiguration)other).actualValueConfigurationIndex;
        //}
        //this.ActualValue = this.ValueConfigurations.CheckedItems.ElementAt(actualValueConfigurationIndex).ActualValue;
      }
    }

    public void UpdateActualValueIndexToItem(IValueConfiguration vc) {
      for (int i = 0; i < this.ValueConfigurations.CheckedItems.Count(); i++) {
        if (this.ValueConfigurations.CheckedItems.ElementAt(i) == vc) {
          this.actualValueConfigurationIndex = i;
          return;
        }
      }
    }

  }
}