#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2018 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.IO;
using System.IO.Compression;
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
using HeuristicLab.Problems.Instances;
using HeuristicLab.Problems.Instances.CordeauGQAP;

namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Instances {
  public class GeneralizedQAPLIBInstanceProvider : ProblemInstanceProvider<GQAPData> {
    public override string Name {
      get { return "Generalized QAPLIB"; }
    }

    public override string Description {
      get { return "GQAP instances based on flow and distance matrices from QAPLIB instances."; }
    }

    public override Uri WebLink {
      get { return null; }
    }

    public override string ReferencePublication {
      get { return null; }
    }

    private const string FileName = "Data";

    public override IEnumerable<IDataDescriptor> GetDataDescriptors() {
      var instanceArchiveName = GetResourceName(FileName + @"\.zip");
      if (String.IsNullOrEmpty(instanceArchiveName)) yield break;

      using (var instanceStream = new ZipArchive(GetType().Assembly.GetManifestResourceStream(instanceArchiveName), ZipArchiveMode.Read)) {
        foreach (var entry in instanceStream.Entries.Select(x => x.Name).OrderBy(x => x)) {
          yield return new GeneralizedQAPLIBInstanceDescriptor(Path.GetFileNameWithoutExtension(entry), GetDescription(), entry);
        }
      }
    }

    public override GQAPData LoadData(IDataDescriptor id) {
      var descriptor = (GeneralizedQAPLIBInstanceDescriptor)id;
      var instanceArchiveName = GetResourceName(FileName + @"\.zip");
      using (var instancesZipFile = new ZipArchive(GetType().Assembly.GetManifestResourceStream(instanceArchiveName), ZipArchiveMode.Read)) {
        var entry = instancesZipFile.GetEntry(descriptor.InstanceIdentifier);
        using (var stream = entry.Open()) {
          var parser = new CordeauGQAPParser();
          parser.Parse(stream);
          var instance = Load(parser);

          instance.Name = id.Name;
          instance.Description = id.Description;

          return instance;
        }
      }
    }

    public override bool CanImportData {
      get { return true; }
    }
    public override GQAPData ImportData(string path) {
      var parser = new CordeauGQAPParser();
      parser.Parse(path);
      var instance = Load(parser);

      instance.Name = Path.GetFileName(path);
      instance.Description = "Loaded from file \"" + path + "\" on " + DateTime.Now.ToString();

      return instance;
    }

    private GQAPData Load(CordeauGQAPParser parser) {
      var instance = new GQAPData();
      instance.BestKnownQuality = parser.BestKnownQuality;
      instance.Equipments = parser.Equipments;
      instance.Locations = parser.Locations;
      instance.Demands = parser.Demands;
      instance.Capacities = parser.Capacities;
      instance.Weights = parser.Weights;
      instance.Distances = parser.Distances;
      instance.InstallationCosts = parser.InstallationCosts;
      instance.TransportationCosts = parser.TransportationCosts;
      return instance;
    }

    private string GetDescription() {
      return "Embedded instance of plugin version " + Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyFileVersionAttribute), true).Cast<AssemblyFileVersionAttribute>().First().Version + ".";
    }

    protected virtual string GetResourceName(string fileName) {
      return Assembly.GetExecutingAssembly().GetManifestResourceNames()
              .Where(x => Regex.Match(x, @".*\.Data\." + fileName).Success).SingleOrDefault();
    }
  }
}