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

namespace HeuristicLab.Optimization {

  [Item("RunCollection Formula Modifier", "Modifies a RunCollection by adding results using the given formula.")]
  [StorableClass]
  public class RunCollectionFormulaModifer : ParameterizedNamedItem, IRunCollectionModifier {

    public override bool CanChangeName { get { return false; } }
    public override bool CanChangeDescription { get { return false; } }

    public ValueParameter<StringValue> ResultNameParameter {
      get { return (ValueParameter<StringValue>)Parameters["ResultName"]; }
    }    
    
    public ValueParameter<StringValue> FormulaParameter {
      get { return (ValueParameter<StringValue>)Parameters["Formula"]; }
    }    

    #region Construction & Cloning    
    [StorableConstructor]
    protected RunCollectionFormulaModifer(bool deserializing) : base(deserializing) { }
    protected RunCollectionFormulaModifer(RunCollectionFormulaModifer original, Cloner cloner)
      : base(original, cloner) {
      RegisterEvents();
    }
    public RunCollectionFormulaModifer() {
      Parameters.Add(new ValueParameter<StringValue>("ResultName", "The name of the result to be generated by this formula.", new StringValue("Calc.Value")));
      Parameters.Add(new ValueParameter<StringValue>("Formula", "RPN formula for new value. This can contain existing run parameters or results (optionally in quotes if they contain whitespace), numbers and arithmetic operators in postfix notation.", new StringValue("1 1 +")));
      UpdateName();
      RegisterEvents();
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new RunCollectionFormulaModifer(this, cloner);
    }
    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      RegisterEvents();
    }
    #endregion

    private void RegisterEvents() {
      ResultNameParameter.ToStringChanged += Parameter_NameChanged;
      FormulaParameter.ToStringChanged += Parameter_NameChanged;
    }

    void Parameter_NameChanged(object sender, EventArgs e) {
      UpdateName();
    }

    private void UpdateName() {
      name = string.Format("{0} := {1}", ResultNameParameter.Value.Value, FormulaParameter.Value.Value);
      OnNameChanged();
    }

    public void Modify(List<IRun> runs) {
      var calc = new Calculator {Formula = FormulaParameter.Value.Value};      
      foreach (var run in runs) {
        var variables = new Dictionary<string, IItem>();
        foreach (var param in run.Parameters)
          variables[param.Key] = param.Value;
        foreach (var result in run.Results)
          variables[result.Key] = result.Value;
        run.Results[ResultNameParameter.Value.Value] = calc.GetValue(variables);        
      }      
    }
    
  }
}