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

namespace HeuristicLab.Problems.MetaOptimization {
  // TODO: ItemName/Descr, storability
  [StorableClass]
  public abstract class ValueConfiguration : NamedItem, IValueConfiguration {
    [Storable]
    protected bool isOptimizable;
    public virtual bool IsOptimizable {
      get { return isOptimizable; }
      set {
        if (this.isOptimizable != value) {
          this.isOptimizable = value;
          OnIsOptimizableChanged();
        }
      }
    }

    [Storable]
    protected bool optimize;
    public virtual bool Optimize {
      get { return optimize; }
      set {
        if (optimize != value) {
          if (value == true && !this.IsOptimizable)
            throw new NotSupportedException("This value is not optimizable.");

          optimize = value;
          OnOptimizeChanged();
          OnToStringChanged();
        }
      }
    }

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

    [Storable]
    protected int number = 0;
    public int Number {
      get { return number; }
      set {
        if (value != number) {
          number = value;
          OnToStringChanged();
        }
      }
    }

    [Storable]
    protected bool valuesReadOnly = false;
    public virtual bool ValuesReadOnly {
      get { return valuesReadOnly; }
      set {
        if (value != this.valuesReadOnly) {
          this.valuesReadOnly = value;
        }
      }
    }

    #region Constructors and Cloning
    protected ValueConfiguration(IItem value, Type valueDataType) {
      this.ActualValue = new ConstrainedValue(value, valueDataType, new ItemSet<IItem> { value }, false);
      this.IsOptimizable = true;
      this.Name = value == null ? "ValueConfiguration" : value.ItemName;
    }

    protected ValueConfiguration() { }
    [StorableConstructor]
    protected ValueConfiguration(bool deserializing) { }
    protected ValueConfiguration(ValueConfiguration original, Cloner cloner)
      : base(original, cloner) {
      this.actualValue = cloner.Clone(original.ActualValue);
      this.isOptimizable = original.isOptimizable;
      this.optimize = original.optimize;
      this.number = original.number;
      this.valuesReadOnly = original.valuesReadOnly;
      RegisterActualValueEvents();
    }
    #endregion

    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);
    }

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

    #region IItem Members
    public override string ItemDescription {
      get { return (actualValue != null && actualValue.Value != null) ? actualValue.Value.ItemDescription : base.ItemDescription; }
    }

    public override Image ItemImage {
      get { return (actualValue != null && actualValue.Value != null) ? actualValue.Value.ItemImage : base.ItemImage; }
    }

    public override string ItemName {
      get { return (actualValue != null && actualValue.Value != null) ? actualValue.Value.ItemDescription : base.ItemName; }
    }
    #endregion

    #region Event Handlers
    public virtual event EventHandler ValueChanged;
    protected virtual void OnValueChanged() {
      var handler = ValueChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    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 string NumberedName {
      get {
        if (this.number == 0) {
          return (ActualValue != null && ActualValue.Value != null) ? ActualValue.Value.ItemName : base.ToString();
        } else {
          return string.Format("{0} {1}", ActualValue.Value.ItemName, number);
        }
      }
    }

    public abstract void Randomize(IRandom random);
    public abstract void Mutate(IRandom random, MutateDelegate mutate, IIntValueManipulator intValueManipulator, IDoubleValueManipulator doubleValueManipulator);
    public abstract void Cross(IRandom random, IOptimizable other, CrossDelegate cross, IIntValueCrossover intValueCrossover, IDoubleValueCrossover doubleValueCrossover);
    public abstract double CalculateSimilarity(IOptimizable optimizable);
    public abstract string ParameterInfoString { get; }
    public abstract void CollectOptimizedParameterNames(List<string> parameterNames, string prefix);
    public abstract List<IOptimizable> GetAllOptimizables();
  }
}