#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2016 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.Drawing;
using System.Linq;
using System.Runtime.Remoting.Contexts;
using System.Threading.Tasks;
using HeuristicLab.Data;
using HeuristicLab.MainForm;
using HeuristicLab.Optimization;

namespace HeuristicLab.Problems.DataAnalysis.Views {
  [View("Residual Analysis")]
  [Content(typeof(IRegressionSolution))]
  public partial class RegressionSolutionResidualAnalysisView : DataAnalysisSolutionEvaluationView {

    public new IRegressionSolution Content {
      get { return (IRegressionSolution)base.Content; }
      set {
        base.Content = value;
      }
    }

    public RegressionSolutionResidualAnalysisView()
      : base() {
      InitializeComponent();
    }

    #region events
    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.ModelChanged += new EventHandler(Content_ModelChanged);
      Content.ProblemDataChanged += new EventHandler(Content_ProblemDataChanged);
    }

    protected override void DeregisterContentEvents() {
      base.DeregisterContentEvents();
      Content.ModelChanged -= new EventHandler(Content_ModelChanged);
      Content.ProblemDataChanged -= new EventHandler(Content_ProblemDataChanged);
    }

    protected virtual void Content_ProblemDataChanged(object sender, EventArgs e) {
      OnContentChanged();
    }

    protected virtual void Content_ModelChanged(object sender, EventArgs e) {
      OnContentChanged();
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      if (Content == null) {
        bubbleChartView.Content = null;
      } else {
        UpdateBubbleChart();
      }
    }

    private void UpdateBubbleChart() {
      if (Content == null) return;
      var selectedXAxis = bubbleChartView.SelectedXAxis;
      var selectedYAxis = bubbleChartView.SelectedYAxis;

      var problemData = Content.ProblemData;
      var ds = problemData.Dataset;
      var runs = new RunCollection();
      // produce training and test values separately as they might overlap (e.g. for ensembles)
      var predictedValuesTrain = Content.EstimatedTrainingValues.ToArray();
      int j = 0; // idx for predictedValues array
      var partitionId = "Partition";
      while (ds.VariableNames.Contains(partitionId)) partitionId += "_";
      foreach (var i in problemData.TrainingIndices) {
        var run = CreateRunForIdx(i, problemData);
        var targetValue = ds.GetDoubleValue(problemData.TargetVariable, i);
        AddErrors(run, predictedValuesTrain[j++], targetValue);
        run.Results.Add(partitionId, new StringValue("Training"));
        run.Color = Color.Gold;
        runs.Add(run);
      }
      var predictedValuesTest = Content.EstimatedTestValues.ToArray();
      j = 0;
      foreach (var i in problemData.TestIndices) {
        var run = CreateRunForIdx(i, problemData);
        var targetValue = ds.GetDoubleValue(problemData.TargetVariable, i);
        AddErrors(run, predictedValuesTest[j++], targetValue);
        run.Results.Add(partitionId, new StringValue("Test"));
        run.Color = Color.Red;
        runs.Add(run);
      }
      if (string.IsNullOrEmpty(selectedXAxis))
        selectedXAxis = "Index";
      if (string.IsNullOrEmpty(selectedYAxis))
        selectedYAxis = "Residual";

      bubbleChartView.Content = runs;
      bubbleChartView.SelectedXAxis = selectedXAxis;
      bubbleChartView.SelectedYAxis = selectedYAxis;
    }

    private void AddErrors(IRun run, double pred, double target) {
      var residual = target - pred;
      var relError = residual / target;
      var predId = "Prediction";
      while (run.Results.ContainsKey(predId)) predId += "_";
      var resId = "Residual";
      while (run.Results.ContainsKey(resId)) resId += "_";
      var relErrorId = "Rel. Error";
      while (run.Results.ContainsKey(relErrorId)) relErrorId += "_";
      run.Results.Add(predId, new DoubleValue(pred));
      run.Results.Add(resId, new DoubleValue(residual));
      run.Results.Add(relErrorId, new DoubleValue(relError));
    }

    private IRun CreateRunForIdx(int i, IRegressionProblemData problemData) {
      var ds = problemData.Dataset;
      var run = new Run();
      foreach (var variableName in ds.DoubleVariables) {
        run.Results.Add(variableName, new DoubleValue(ds.GetDoubleValue(variableName, i)));
      }
      foreach (var variableName in ds.StringVariables) {
        run.Results.Add(variableName, new StringValue(ds.GetStringValue(variableName, i)));
      }

      return run;
    }
    #endregion

  }
}