#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.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using HeuristicLab.Analysis;
using HeuristicLab.Analysis.Views;
using HeuristicLab.Collections;
using HeuristicLab.Data;
using HeuristicLab.MainForm;
using HeuristicLab.MainForm.WindowsForms;

namespace HeuristicLab.DataPreprocessing.Views {
  [View("Preprocessing Chart View")]
  [Content(typeof(PreprocessingChartContent), false)]
  public partial class PreprocessingChartView : PreprocessingCheckedVariablesView {  
    protected Dictionary<string, DataTable> dataTables;
    protected Dictionary<string, DataTableControl> dataTableControls;

    private const int FIXED_CHART_SIZE = 300;
    private const int MAX_TABLE_AUTO_SIZE_ROWS = 3;

    protected static readonly Color[] Colors = {
      Color.FromArgb(59, 136, 239), Color.FromArgb(252, 177, 59), Color.FromArgb(226, 64, 10),
      Color.FromArgb(5, 100, 146), Color.FromArgb(191, 191, 191), Color.FromArgb(26, 59, 105),
      Color.FromArgb(255, 226, 126), Color.FromArgb(18, 156, 221), Color.FromArgb(202, 107, 75),
      Color.FromArgb(0, 92, 219), Color.FromArgb(243, 210, 136), Color.FromArgb(80, 99, 129),
      Color.FromArgb(241, 185, 168), Color.FromArgb(224, 131, 10), Color.FromArgb(120, 147, 190)
    };


    public PreprocessingChartView() {
      InitializeComponent();
      dataTables = new Dictionary<string, DataTable>();
      dataTableControls = new Dictionary<string, DataTableControl>();
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      if (Content != null) {
        InitData();
        GenerateLayout();
      }
    }

    protected virtual int GetNumberOfVisibleDataTables() {
      return Content.VariableItemList.CheckedItems.Count();
    }

    protected virtual IEnumerable<DataTableControl> GetVisibleDataTables() {
      foreach (var name in Content.VariableItemList.CheckedItems) {
        if (!dataTableControls.ContainsKey(name.Value.Value))
          dataTableControls.Add(name.Value.Value, new DataTableControl() { Content = dataTables[name.Value.Value] });
        yield return dataTableControls[name.Value.Value];
      }
    }

    protected virtual DataTable CreateDataTable(string variableName) {
      return null;
    }

    protected virtual void InitData() {
      dataTables.Clear();
      dataTableControls.Clear();
      foreach (var variable in Content.VariableItemList.Select(v => v.Value)) {
        dataTables.Add(variable, CreateDataTable(variable));
      }
    }

    protected override void CheckedItemsChanged(object sender, CollectionItemsChangedEventArgs<IndexedItem<StringValue>> checkedItems) {
      base.CheckedItemsChanged(sender, checkedItems);

      foreach (IndexedItem<StringValue> item in checkedItems.Items) {
        string variableName = item.Value.Value;

        if (!IsVariableChecked(variableName)) {
          // not checked -> remove
          //dataTableView.SetRowEnabled(variableName, false);
          //dataTablePerVariable.Remove(dataTablePerVariable.Find(x => (x.Name == variableName)));
        } else {
          // checked -> add
          //DataRow row = GetDataRow(variableName);
          //dataTableView.SetRowEnabled(variableName, true);

          //var pdt = new DataTable(variableName);
          //pdt.VisualProperties.Title = string.Empty;
          //pdt.Rows.Add(row);
          // dataTablePerVariable does not contain unchecked variables => reduce insert position by number of uncheckt variables to correct the index
          //int uncheckedUntilVariable = checkedItemList.Content.TakeWhile(x => x.Value != variableName).Count(x => !checkedItemList.Content.ItemChecked(x));
          //dataTables.Insert(item.Index - uncheckedUntilVariable, pdt);
        }
      }

      // update chart if not in all in one mode
      //if (Content != null && !Content.AllInOneMode)
      //GenerateChart();??
      GenerateLayout();
    }


    #region Add/Remove/Update Variable, Reset
    protected override void AddVariable(string name) {
      base.AddVariable(name);
      dataTables.Add(name, CreateDataTable(name));

      GenerateLayout();
    }

    // remove variable from data table and item list
    protected override void RemoveVariable(string name) {
      base.RemoveVariable(name);
      dataTables.Remove(name);
      dataTableControls.Remove(name);

      GenerateLayout();
    }

    protected override void UpdateVariable(string name) {
      base.UpdateVariable(name);
      dataTables.Remove(name);
      var newDataTable = CreateDataTable(name);
      dataTables.Add(name, newDataTable);
      dataTableControls[name].Content = newDataTable;
      GenerateLayout();
    }
    protected override void ResetAllVariables() {
      InitData();
    }
    #endregion

    protected override void CheckedChangedUpdate() {
      GenerateLayout();
    }

    #region Generate Layout
    protected void GenerateLayout() {
      if (suppressCheckedChangedUpdate)
        return;

      tableLayoutPanel.SuspendRepaint();

      ClearTableLayout();

      int nrCharts = GetNumberOfVisibleDataTables();

      // Set columns and rows based on number of items
      int columns = GetNrOfMultiChartColumns(nrCharts);
      int rows = GetNrOfMultiChartRows(nrCharts, columns);

      tableLayoutPanel.ColumnCount = columns;
      tableLayoutPanel.RowCount = rows;

      using (var enumerator = GetVisibleDataTables().GetEnumerator()) {
        for (int x = 0; x < columns; x++) {
          var columnStyle = rows <= MAX_TABLE_AUTO_SIZE_ROWS
            ? new ColumnStyle(SizeType.Percent, 100 / columns)
            : new ColumnStyle(SizeType.Absolute, (tableLayoutPanel.Width - SystemInformation.VerticalScrollBarWidth) / columns);
          tableLayoutPanel.ColumnStyles.Add(columnStyle);

          for (int y = 0; y < rows; y++) {
            // Add a row only when creating the first column
            if (x == 0) {
              var rowStyle = rows > MAX_TABLE_AUTO_SIZE_ROWS
                ? new RowStyle(SizeType.Absolute, FIXED_CHART_SIZE)
                : new RowStyle(SizeType.Percent, 100 / rows);
              tableLayoutPanel.RowStyles.Add(rowStyle);
            }

            if (enumerator.MoveNext())
              AddDataTableToTableLayout(enumerator.Current, x, y);
          }
        }
      }

      tableLayoutPanel.ResumeRepaint(true);
    }

    private int GetNrOfMultiChartColumns(int itemCount) {
      int columns = 0;
      if (itemCount <= 2)
        columns = 1;
      else if (itemCount <= 6)
        columns = 2;
      else
        columns = 3;
      return columns;
    }
    private int GetNrOfMultiChartRows(int itemCount, int columns) {
      int rows = 0;
      if (columns == 3)
        rows = (itemCount + 2) / columns;
      else if (columns == 2)
        rows = (itemCount + 1) / columns;
      else
        rows = itemCount / columns;
      return rows;
    }

    private void AddDataTableToTableLayout(DataTableControl dataTable, int x, int y) {
      //dataView.Classification = Classification;
      //dataView.IsDetailedChartViewEnabled = IsDetailedChartViewEnabled;

      if (dataTable == null) {
        // dummy panel for empty field 
        Panel p = new Panel { Dock = DockStyle.Fill };
        tableLayoutPanel.Controls.Add(p, y, x);
      } else {
        dataTable.Dock = DockStyle.Fill;
        tableLayoutPanel.Controls.Add(dataTable, y, x);
      }
    }

    protected void ClearTableLayout() {
      //Clear out the existing controls
      tableLayoutPanel.Controls.Clear();

      //Clear out the existing row and column styles
      tableLayoutPanel.ColumnStyles.Clear();
      tableLayoutPanel.RowStyles.Clear();

      tableLayoutPanel.Width = 0;
      tableLayoutPanel.Height = 0;

      tableLayoutPanel.AutoScroll = false;
      tableLayoutPanel.AutoScroll = true;
    }
    //Remove horizontal scroll bar if visible
    private void tableLayoutPanel_Layout(object sender, LayoutEventArgs e) {
      if (tableLayoutPanel.HorizontalScroll.Visible) {
        // Add padding on the right in order to accomodate the vertical scrollbar
        int vWidth = SystemInformation.VerticalScrollBarWidth;
        tableLayoutPanel.Padding = new Padding(0, 0, vWidth, 0);
      } else {
        // Reset padding
        tableLayoutPanel.Padding = new Padding(0);
      }
    }
    #endregion
  }
}