#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.Linq;
using System.Windows.Forms;
using HeuristicLab.Core.Views;
using HeuristicLab.Data;
using HeuristicLab.MainForm;
using HeuristicLab.Optimization;

namespace HeuristicLab.Analysis.Statistics {
  [View("Sample Size Checker View")]
  [Content(typeof(RunCollection), false)]
  public sealed partial class SampleSizeChecker : ItemView {

    private double[] data;

    public SampleSizeChecker() {
      InitializeComponent();

      double prec = 0.01;
      double conf = 0.95;
      precisionTextBox.Text = prec.ToString();
      confIntervalTextBox.Text = conf.ToString();
    }

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

    public override bool ReadOnly {
      get { return true; }
      set { /*not needed because results are always readonly */}
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      resultComboBox.Items.Clear();

      if (Content != null) {
        UpdateResultComboBox();
      }
    }

    #region events
    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.ItemsAdded += new HeuristicLab.Collections.CollectionItemsChangedEventHandler<IRun>(Content_ItemsAdded);
      Content.ItemsRemoved += new HeuristicLab.Collections.CollectionItemsChangedEventHandler<IRun>(Content_ItemsRemoved);
      Content.CollectionReset += new HeuristicLab.Collections.CollectionItemsChangedEventHandler<IRun>(Content_CollectionReset);

      RegisterRunEvents(Content);
    }

    private void RegisterRunEvents(IEnumerable<IRun> runs) {
      foreach (IRun run in runs)
        run.Changed += new EventHandler(run_Changed);
    }

    protected override void DeregisterContentEvents() {
      base.DeregisterContentEvents();
      Content.ItemsAdded -= new HeuristicLab.Collections.CollectionItemsChangedEventHandler<IRun>(Content_ItemsAdded);
      Content.ItemsRemoved -= new HeuristicLab.Collections.CollectionItemsChangedEventHandler<IRun>(Content_ItemsRemoved);
      Content.CollectionReset -= new HeuristicLab.Collections.CollectionItemsChangedEventHandler<IRun>(Content_CollectionReset);

      DeregisterRunEvents(Content);
    }

    private void DeregisterRunEvents(IEnumerable<IRun> runs) {
      foreach (IRun run in runs)
        run.Changed -= new EventHandler(run_Changed);
    }

    private void Content_CollectionReset(object sender, HeuristicLab.Collections.CollectionItemsChangedEventArgs<IRun> e) {
      DeregisterRunEvents(e.OldItems);
      RegisterRunEvents(e.Items);
      //RebuildInfluenceDataTable();
    }

    private void Content_ItemsRemoved(object sender, HeuristicLab.Collections.CollectionItemsChangedEventArgs<IRun> e) {
      DeregisterRunEvents(e.Items);
      //RebuildInfluenceDataTable();
    }

    private void Content_ItemsAdded(object sender, HeuristicLab.Collections.CollectionItemsChangedEventArgs<IRun> e) {
      RegisterRunEvents(e.Items);
      //RebuildInfluenceDataTable();
    }

    private void run_Changed(object sender, EventArgs e) {
      if (InvokeRequired)
        this.Invoke(new EventHandler(run_Changed), sender, e);
      else {
        IRun run = (IRun)sender;
        UpdateRun(run);
      }
    }
    #endregion

    private void UpdateRun(IRun run) {
      //TODO: hacky di hack... this is baaaadddd
      RebuildDataTable();
    }

    private void UpdateResultComboBox() {
      resultComboBox.Items.Clear();
      var results = (from run in Content
                     where run.Visible
                     from result in run.Results
                     where result.Value is IntValue || result.Value is DoubleValue
                     select result.Key).Distinct().ToArray();

      resultComboBox.Items.AddRange(results);
      if (resultComboBox.Items.Count > 0) resultComboBox.SelectedItem = resultComboBox.Items[0];
    }

    private void RebuildDataTable() {
      string resultName = (string)resultComboBox.SelectedItem;

      var runs = Content.Where(x => x.Results.ContainsKey(resultName) && x.Visible);
      var vals = runs.Select(x => (double)((dynamic)x.Results[resultName]).Value);
      data = vals.ToArray();

      DoubleMatrix dt = new DoubleMatrix(runs.Count(), 1);
      dt.ColumnNames = new string[] { resultName };

      int i = 0;
      foreach (double val in vals) {
        dt[i++, 0] = val;
      }

      stringConvertibleMatrixView.Content = dt;
    }

    private void estimateSampleSizeButton_Click(object sender, EventArgs e) {
      double precision = double.Parse(precisionTextBox.Text);
      double confInterval = double.Parse(confIntervalTextBox.Text);

      int nrSamplesReq = SampleSizeDetermination.DetermineSampleSizeByEstimatingMean(data, precision, confInterval);
      int curNrSamples = data.Count();
      int diff = curNrSamples - nrSamplesReq;

      IntMatrix m = new IntMatrix(1, 3);
      m[0, 0] = curNrSamples;
      m[0, 1] = nrSamplesReq;
      m[0, 2] = diff;
      m.ColumnNames = new string[] { "Nr. of current samples", "Minimum nr. of required samples", "Difference" };

      MainFormManager.MainForm.ShowContent(m);
    }

    private void resultComboBox_SelectedValueChanged(object sender, EventArgs e) {
      RebuildDataTable();
    }
  }
}