#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;

namespace HeuristicLab.Problems.Instances.PermutationProblems.LinearOrdering {
  public class LOPSPECInstanceProvider : ProblemInstanceProvider<LOPData> {

    public override string Name
    {
      get { return "SPEC"; }
    }

    public override string Description
    {
      get { return "Linear Ordering Problems SPEC test instances"; }
    }

    public override Uri WebLink
    {
      get { return new Uri("http://www.optsicom.es/lolib/lop/Spec.zip"); }
    }

    public override string ReferencePublication
    {
      get { return "Martí, R., & Reinelt, G. (2011). The Linear Ordering Problem. Applied Mathematical Sciences. Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-16729-4"; }
    }

    public override IEnumerable<IDataDescriptor> GetDataDescriptors() {
      var instanceArchiveName = GetResourceName("SPEC.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 LOPDataDescriptor(Path.GetFileNameWithoutExtension(entry), GetDescription(), entry, null);
        }
      }
    }

    public override LOPData LoadData(IDataDescriptor id) {
      var descriptor = (LOPDataDescriptor)id;
      var instanceArchiveName = GetResourceName("SPEC.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 LOPParser();
          parser.Parse(stream);
          return Load(parser);
        }
      }
    }

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

    private LOPData Load(LOPParser parser) {
      var instance = new LOPData {
        Name = parser.Name,
        Description = parser.Description,
        Dimension = parser.Dimension,
        Matrix = parser.Matrix,
        BestKnownPermutation = parser.BestKnownPermutation,
        BestKnownQuality = parser.BestKnownQuality
      };
      return instance;
    }

    public override bool CanExportData
    {
      get { return false; }
    }

    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()
        .SingleOrDefault(x => Regex.Match(x, @".*\.Data\." + fileName).Success);
    }
  }
}