using HeuristicLab.BioBoost.Representation;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.MainForm;
using HeuristicLab.Optimization;
using HeuristicLab.Optimizer;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MenuItem = HeuristicLab.MainForm.WindowsForms.MenuItem;


namespace HeuristicLab.BioBoost.Views {
  internal sealed class ExportSolutionMenuItem : MenuItem, IOptimizerUserInterfaceItemProvider {
    public override string Name {
      get { return "Export CSV"; }
    }

    public override IEnumerable<string> Structure {
      get { return new string[] { "&File" }; }
    }

    public override int Position {
      get { return 1450; }
    }

    protected override void OnToolStripItemSet(EventArgs e) {
      ToolStripItem.Enabled = false;
    }

    protected override void OnActiveViewChanged(object sender, EventArgs e) {
      IContentView activeView = MainFormManager.MainForm.ActiveView as IContentView;
      if (activeView == null) {
        ToolStripItem.Enabled = false;
        return;
      }

      var content = activeView.Content;
      RunCollection runCollection = content as RunCollection;
      var optimizer = content as IOptimizer;
      if (runCollection == null && optimizer != null) {
        runCollection = ((IOptimizer)content).Runs;
      }

      var alg = content as IAlgorithm;
      var solution = content as BioBoostCompoundSolution;

      ToolStripItem.Enabled =
        // at least on run with a result || or the alg is paused and results contains a bioboost solution
        (runCollection != null && runCollection.Any(run => run.Results.Any(p => p.Value is BioBoostCompoundSolution))) ||
        (alg != null && alg.ExecutionState == ExecutionState.Paused && alg.Results.Any(r => r.Value is BioBoostCompoundSolution)) ||
        (solution != null)
        ;
    }

    public override void Execute() {
      var folderBrowserDialog = new FolderBrowserDialog();
      folderBrowserDialog.Description = "Select the export directory.";
      folderBrowserDialog.RootFolder = Environment.SpecialFolder.Desktop;
      if (folderBrowserDialog.ShowDialog() == DialogResult.OK) {
        var folderName = folderBrowserDialog.SelectedPath;
        IContentView activeView = (IContentView)MainFormManager.MainForm.ActiveView;
        var mainForm = (MainForm.WindowsForms.MainForm)MainFormManager.MainForm;
        mainForm.AddOperationProgressToContent(activeView.Content, "Export solutions.");

        Action<IContentView> action = (view) => {
          var i = 0;
          // export the solutions of all runs
          foreach (var run in view.Content.GetObjectGraphObjects(excludeStaticMembers: true).OfType<Run>()) {
            var solution =
              run.GetObjectGraphObjects(excludeStaticMembers: true).OfType<BioBoostCompoundSolution>().FirstOrDefault();
            if (solution == null) continue;
            ExportSolution(folderName, i++, run.Name, solution);
          }
          // export the solutions in the results of the paused algorithm
          var alg = view.Content as IAlgorithm;
          if (alg != null && alg.ExecutionState == ExecutionState.Paused) {
            foreach (var solution in alg.Results.Select(r => r.Value).OfType<BioBoostCompoundSolution>()) {
              ExportSolution(folderName, i++, alg.Name, solution);
            }
          }

          // export the solution itself
          var bioBoostSolution = view.Content as BioBoostCompoundSolution;
          if (bioBoostSolution != null)
            ExportSolution(folderName, i++, bioBoostSolution.Name, bioBoostSolution);
        };

        action.BeginInvoke(activeView, delegate(IAsyncResult result) {
          try {
            action.EndInvoke(result);
          } catch (SystemException e) {
            var dialog = new HeuristicLab.PluginInfrastructure.ErrorDialog(e);
            dialog.ShowDialog();
          }
          mainForm.RemoveOperationProgressFromContent(activeView.Content);
        }, null);
      }
    }

    private void ExportSolution(string folderName, int i, string name, BioBoostCompoundSolution solution) {
      var csv = CreateCsvSolution(solution);
      var filename = string.Format("{0}-{1}.csv", i, name);
      // remove invalid characters
      foreach (var ch in Path.GetInvalidFileNameChars()) {
        filename = filename.Replace(ch, '_');

      }
      var path = Path.Combine(folderName, filename);
      if (path.Length >= 248) throw new PathTooLongException("The path is longer than 248 characters. Try to save your files in a different folder");
      if (filename.Length >= 260) throw new PathTooLongException("The filename is longer than 260 characters. Please change the name of runs to something shorter.");
      File.WriteAllText(path, csv);
    }

    private string CreateCsvSolution(BioBoostCompoundSolution content) {
      content.EvaluateAndUpdateAllResults();
      var sb = new StringBuilder();
      // header
      sb.Append("NUTS_ID").Append(",");
      sb.Append(string.Join(",", content.IntValues.Select(x => string.Format("\"{0}\"", x.Key)))).Append(",");
      sb.Append(string.Join(",", content.IntValues.Select(x => string.Format("\"{0}-Region\"", x.Key)))).Append(",");
      sb.Append(string.Join(",", content.DoubleValues.Select(x => string.Format("\"{0}\"", x.Key)))).Append(",");
      sb.Append(string.Join(",", content.StringValues.Select(x => string.Format("\"{0}\"", x.Key))));
      sb.Append(Environment.NewLine);
      // rows
      for (int i = 0; i < content.LocationNames.Length; i++) {
        sb.Append(content.LocationNames[i]);
        foreach (var kvp in content.IntValues) { sb.Append(",").Append(kvp.Value[i].ToString("D", CultureInfo.InvariantCulture)); }
        foreach (var kvp in content.IntValues) { sb.Append(",").Append(kvp.Value[i] < 0 ? "" : content.LocationNames[kvp.Value[i]]); }
        foreach (var kvp in content.DoubleValues) { sb.Append(",").Append(kvp.Value[i].ToString("G", CultureInfo.InvariantCulture)); }
        foreach (var kvp in content.StringValues) { sb.Append(",").Append(kvp.Value[i]); }
        sb.Append(Environment.NewLine);
      }

      return sb.ToString();
    }

    /*
    private string CreateJsonSolution(BioBoostCompoundSolution content) {
      var builder = new StringBuilder();
      builder.Append("{ \"type\": \"FeatureCollection\", \n\"features\": [");
      for (int i = 0; i < content.LocationNames.Length; i++) {
        if (i > 0) builder.Append(",");
        builder.Append("\n{ \"type\": \"Feature\", \"properties\": { \"NUTS_ID\": \"");
        builder.Append(content.LocationNames[i]);
        builder.Append("\"");
        foreach (var kvp in content.IntValues) {
          var target = content.LocationNames[i];
          if (kvp.Value[i] >= 0) {
            target = content.LocationNames[kvp.Value[i]];
          }
          builder.Append(",\n                                     \"");
          builder.Append(kvp.Key);
          builder.Append("\": \"");
          builder.Append(target);
          builder.Append("\"");
        }
        foreach (var kvp in content.DoubleValues) {
          builder.Append(",\n                                     \"");
          builder.Append(kvp.Key);
          builder.Append("\": ");
          builder.Append(kvp.Value[i].ToString("R", CultureInfo.InvariantCulture));
        }
        builder.Append("} }");
      }
      builder.Append("\n]\n}");

      return builder.ToString();
    }
    */
  }
}