#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2012 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.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
using ICSharpCode.SharpZipLib.Zip;

namespace HeuristicLab.Problems.Instances.BinPacking {
  public class BPPORLIBInstanceProvider : ProblemInstanceProvider<BPPData> {

    public override string Name {
      get { return "ORLIB BPP"; }
    }

    public override string Description {
      get { return "Bin packing problems from the Operations Research Library."; }
    }

    public override Uri WebLink {
      get { return new Uri("http://people.brunel.ac.uk/~mastjjb/jeb/orlib/binpacktwoinfo.html , http://www.diku.dk/~pisinger/new3dbpp/readme.3dbpp"); }
    }

    public override string ReferencePublication {
      get { return String.Empty; }
    }

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

      using (var instanceStream = new ZipInputStream(GetType().Assembly.GetManifestResourceStream(instanceArchiveName))) {
        foreach (var entry in GetZipContents(instanceStream).OrderBy(x => x)) {
          yield return new BPPORLIBDataDescriptor(Path.GetFileNameWithoutExtension(entry), GetDescription(), entry, null);
        }
      }
    }

    public override BPPData LoadData(IDataDescriptor id) {
      var descriptor = (BPPORLIBDataDescriptor)id;
      var instanceArchiveName = GetResourceName("JSSPORLIB.zip");
      using (var instancesZipFile = new ZipFile(GetType().Assembly.GetManifestResourceStream(instanceArchiveName))) {
        var entry = instancesZipFile.GetEntry(descriptor.InstanceIdentifier);

        using (var stream = instancesZipFile.GetInputStream(entry)) {
          var parser = new BPPORLIBParser();
          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 BPPData ImportData(string path) {
      var parser = new BPPORLIBParser();
      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 BPPData Load(BPPORLIBParser parser) {
      var instance = new BPPData {
        Items = parser.Items,
        BinMeasures = parser.BinMeasures,
        ItemMeasures = parser.ItemMeasures
      };
      return instance;
    }

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

    public override void ExportData(BPPData instance, string path) {
      var parser = new BPPORLIBParser {
        Name = instance.Name,
        Description = instance.Description,
        Items = instance.Items,
        BinMeasures = instance.BinMeasures,
        ItemMeasures = instance.ItemMeasures
      };
      parser.Export(path);
    }

    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);
    }

    protected IEnumerable<string> GetZipContents(ZipInputStream zipFile) {
      ZipEntry entry;
      while ((entry = zipFile.GetNextEntry()) != null) {
        yield return entry.Name;
      }
    }
  }
}