#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 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 System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HeuristicLab.Problems.VehicleRouting.Interfaces;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Core;
using HeuristicLab.Parameters;
using HeuristicLab.Data;
using HeuristicLab.Optimization;
using HeuristicLab.PluginInfrastructure;
using HeuristicLab.Problems.VehicleRouting.Variants;
using HeuristicLab.Problems.VehicleRouting.Encodings;

namespace HeuristicLab.Problems.VehicleRouting.ProblemInstances {
  [Item("CVRPTWEvaluator", "Represents a single depot CVRPTW evaluator.")]
  [StorableClass]
  public class CVRPTWEvaluator: CVRPEvaluator {
    public ILookupParameter<DoubleValue> TardinessParameter {
      get { return (ILookupParameter<DoubleValue>)Parameters["Tardiness"]; }
    }

    public ILookupParameter<DoubleValue> TravelTimeParameter {
      get { return (ILookupParameter<DoubleValue>)Parameters["TravelTime"]; }
    }

    protected override VRPEvaluation CreateTourEvaluation() {
      return new CVRPTWEvaluation();
    }

    protected override void EvaluateTour(VRPEvaluation eval, IVRPProblemInstance instance, Tour tour) {
      base.EvaluateTour(eval, instance, tour);

      ITimeWindowedProblemInstance vrptw = instance as ITimeWindowedProblemInstance;

      double time = 0.0;
      double waitingTime = 0.0;
      double serviceTime = 0.0;
      double tardiness = 0.0;

      //simulate a tour, start and end at depot
      for (int i = 0; i <= tour.Stops.Count; i++) {
        int start = 0;
        if (i > 0)
          start = tour.Stops[i - 1];
        int end = 0;
        if (i < tour.Stops.Count)
          end = tour.Stops[i];

        //drive there
        double currentDistace = vrptw.GetDistance(start, end);
        time += currentDistace;

        //check if it was serviced on time
        if (time > vrptw.DueTime[end])
          tardiness += time - vrptw.DueTime[end];

        //wait
        double currentWaitingTime = 0.0;
        if (time < vrptw.ReadyTime[end])
          currentWaitingTime = vrptw.ReadyTime[end] - time;
        waitingTime += currentWaitingTime;
        time += currentWaitingTime;

        //service
        double currentServiceTime = vrptw.ServiceTime[end];
        serviceTime += currentServiceTime;
        time += currentServiceTime;
      }

      (eval as CVRPTWEvaluation).Tardiness = tardiness;
      (eval as CVRPTWEvaluation).TravelTime = time;

      double penalty = tardiness * vrptw.TardinessPenalty.Value;
      eval.Penalty += penalty;
      eval.Quality += penalty;
      eval.Quality += time * vrptw.TimeFactor.Value;
    }

    protected override void InitResultParameters() {
      base.InitResultParameters();

      TardinessParameter.ActualValue = new DoubleValue(0);
      TravelTimeParameter.ActualValue = new DoubleValue(0);
    }

    protected override void UpdateResultParameters(VRPEvaluation tourEvaluation) {
      base.UpdateResultParameters(tourEvaluation);

      TardinessParameter.ActualValue.Value += (tourEvaluation as CVRPTWEvaluation).Tardiness;
      TravelTimeParameter.ActualValue.Value += (tourEvaluation as CVRPTWEvaluation).TravelTime;
    }
    
    [StorableConstructor]
    protected CVRPTWEvaluator(bool deserializing) : base(deserializing) { }

    public CVRPTWEvaluator() {
      Parameters.Add(new LookupParameter<DoubleValue>("Tardiness", "The tardiness."));
      Parameters.Add(new LookupParameter<DoubleValue>("TravelTime", "The travel time."));
    }
  }
}