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

namespace HeuristicLab.Problems.MetaOptimization {
  [StorableClass]
  public class Range<T> : Item, IRange<T> where T : class, IItem, IStringConvertibleValue, IDeepCloneable {
    [Storable]
    private T lowerBound;
    public T LowerBound {
      get { return lowerBound; }
      set {
        if (lowerBound != value) {
          if (lowerBound != null) {
            lowerBound.ValueChanged -= new EventHandler(lowerBound_ValueChanged);
          }
          lowerBound = value;
          if (lowerBound != null) {
            lowerBound.ValueChanged += new EventHandler(lowerBound_ValueChanged);
          }
          OnLowerBoundChanged();
        }
      }
    }

    [Storable]
    private T upperBound;
    public T UpperBound {
      get { return upperBound; }
      set {
        if (upperBound != value) {
          if (upperBound != null) {
            upperBound.ValueChanged -= new EventHandler(upperBound_ValueChanged);
          }
          upperBound = value;
          if (upperBound != null) {
            upperBound.ValueChanged += new EventHandler(upperBound_ValueChanged);
          }
          OnUpperBoundChanged();
        }
      }
    }

    [Storable]
    private T stepSize;
    public T StepSize {
      get { return stepSize; }
      set {
        if (stepSize != value) {
          if (stepSize != null) {
            stepSize.ValueChanged -= new EventHandler(upperBound_ValueChanged);
          }
          stepSize = value;
          if (stepSize != null) {
            stepSize.ValueChanged += new EventHandler(stepSize_ValueChanged);
          }
          OnStepSizeChanged();
        }
      }
    }

    public Range() {
      LowerBound = Activator.CreateInstance<T>();
      UpperBound = Activator.CreateInstance<T>();
      StepSize = Activator.CreateInstance<T>(); // todo: stepsize should be != 0
    }

    [StorableConstructor]
    protected Range(bool deserializing) : base(deserializing) { }
    protected Range(Range<T> original, Cloner cloner) : base(original, cloner) {
      this.LowerBound = cloner.Clone(original.LowerBound);
      this.UpperBound = cloner.Clone(original.UpperBound);
      this.StepSize = cloner.Clone(original.StepSize);
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new Range<T>(this, cloner);
    }

    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      if (lowerBound != null) {
        lowerBound.ValueChanged += new EventHandler(lowerBound_ValueChanged);
      }
      if (upperBound != null) {
        upperBound.ValueChanged += new EventHandler(upperBound_ValueChanged);
      }
      if (stepSize != null) {
        stepSize.ValueChanged += new EventHandler(stepSize_ValueChanged);
      }
    }

    void lowerBound_ValueChanged(object sender, EventArgs e) {
      OnToStringChanged();
    }
    void upperBound_ValueChanged(object sender, EventArgs e) {
      OnToStringChanged();
    }
    void stepSize_ValueChanged(object sender, EventArgs e) {
      OnToStringChanged();
    }

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

    public event EventHandler UpperBoundChanged;
    private void OnUpperBoundChanged() {
      var handler = UpperBoundChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler StepSizeChanged;
    private void OnStepSizeChanged() {
      var handler = StepSizeChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public override string ToString() {
      return string.Format("[{0},{1}:{2}]", LowerBound.ToString(), UpperBound.ToString(), StepSize.ToString());
    }
  }
}