#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 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.Text;
using System.Windows.Forms;
using HeuristicLab.PluginInfrastructure;
using System.Net;
using System.ServiceModel;
using HeuristicLab.CEDMA.DB.Interfaces;
using HeuristicLab.CEDMA.DB;
using System.ServiceModel.Description;
using System.Linq;
using HeuristicLab.CEDMA.Core;

namespace HeuristicLab.CEDMA.Server {
  public class Dispatcher {
    private List<string> dispatchQueue;
    public IList<string> DispatchQueue {
      get { return dispatchQueue.AsReadOnly(); }
    }

    private IStore store;

    public Dispatcher(IStore store) {
      this.store = store;
      this.dispatchQueue = new List<string>();
    }

    private void FillDispatchQueue() {
      Dictionary<Entity, Dictionary<int, int>> numberOfModelsOfTargetVariableOfDataSet = new Dictionary<Entity, Dictionary<int, int>>();
      IList<Statement> datasetStatements = store.Select(new Statement(Ontology.AnyEntity, Ontology.PredicateInstanceOf, Ontology.TypeDataSet));
      foreach (Statement datasetStatement in datasetStatements) {
        numberOfModelsOfTargetVariableOfDataSet.Add(datasetStatement.Subject, new Dictionary<int, int>());
        IList<Statement> modelStatements = store.Select(new Statement(datasetStatement.Subject, Ontology.PredicateHasModel, Ontology.AnyEntity));
        foreach (Statement modelStatement in modelStatements) {
          IList<Statement> modelAttributeStatements = store.Select(new Statement((Entity)modelStatement.Property, Ontology.PredicateModelAttribute, Ontology.AnyEntity));
          foreach (Statement modelAttrStatement in modelAttributeStatements) {
            var targetVariableStatements = store.Select(new Statement((Entity)modelAttrStatement.Property, Ontology.PredicateModelAttributeName, Ontology.AnyEntity))
               .Where(t => (string)((Literal)t.Property).Value == "TargetVariable")
               .SelectMany(t => store.Select(new Statement((Entity)modelAttrStatement.Property, Ontology.PredicateModelAttributeValue, Ontology.AnyEntity)))
               .GroupBy(t => (int)((Literal)t.Property).Value);
            foreach (var targetVariable in targetVariableStatements) {
              numberOfModelsOfTargetVariableOfDataSet[datasetStatement.Subject].Add(targetVariable.Key, targetVariable.Count());
            }
          }
        }
      }
      foreach(KeyValuePair<Entity, Dictionary<int, int>> dataSetEntry in numberOfModelsOfTargetVariableOfDataSet) {
        DataSet dataSet = new DataSet(store, dataSetEntry.Key);
        foreach(int targetVariable in dataSet.Problem.AllowedTargetVariables)
          if (!dataSetEntry.Value.ContainsKey(targetVariable) || dataSetEntry.Value[targetVariable] < 10) {
            QueueJob(dataSet.Name + " - target variable: " + targetVariable);
          }
      }
    }

    private void QueueJob(string job) {
      dispatchQueue.Add(job);
    }

    private string GetNextJob() {
      if (dispatchQueue.Count == 0) FillDispatchQueue();
      string next = dispatchQueue[0];
      dispatchQueue.RemoveAt(0);
      return next;
    }

    internal void Start() {
      FillDispatchQueue();
    }
  }
}