#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2013 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.Data;
using System.Linq;
using System.Windows.Forms;

namespace HeuristicLab.DataImporter.Data.View {
  public partial class DataSetView : UserControl {
    private DataSetView() {
      InitializeComponent();
      columnGroupViews = new List<ColumnGroupView>();
      this.AutoScroll = true;
      this.Scroll += new ScrollEventHandler(DataSetView_Scroll);
      this.state = new DataSetState(0, ColumnGroupState.None);
    }

    public DataSetView(Model.DataSet dataSet)
      : this() {
      this.DataSet = dataSet;
      this.DataSet.Changed += this.DataSetChanged;
      this.Refresh();
    }

    public DataSetView(Model.DataSet dataSet, CommandChain commandChain)
      : this(dataSet) {
      this.CommandChain = commandChain;
    }

    private List<ColumnGroupView> columnGroupViews;

    private CommandChain commandChain;
    public CommandChain CommandChain {
      get { return this.commandChain; }
      set {
        this.commandChain = value;
        foreach (ColumnGroupView view in this.columnGroupViews)
          view.CommandChain = value;
      }
    }

    private int columnGroupMaxWidth;
    public int ColumnGroupMaxWidth {
      get { return columnGroupMaxWidth; }
      set {
        columnGroupMaxWidth = value;
        foreach (ColumnGroupView view in columnGroupViews)
          view.MaxWidth = value;
      }
    }

    private Model.DataSet dataSet;
    public Model.DataSet DataSet {
      get { return (Model.DataSet)this.dataSet; }
      private set { this.dataSet = value; }
    }

    private DataSetState state;
    public DataSetState State {
      get { return this.state; }
      protected set {
        this.state = value;
        FireStateChanged();
      }
    }

    private bool allowReorderColumns;
    public bool AllowReorderColumns {
      set {
        allowReorderColumns = value;
        foreach (ColumnGroupView view in this.columnGroupViews) {
          view.AllowReorderColumns = value;
        }
      }
      get { return allowReorderColumns; }
    }

    public override void Refresh() {
      base.Refresh();

      //clean up - caution: view.dispose removes disposed view from controls collection
      this.SuspendLayout();
      this.Controls.Clear();
      foreach (ColumnGroupView view in this.columnGroupViews.Reverse<ColumnGroupView>())
        view.Dispose();
      this.columnGroupViews.Clear();

      ColumnGroupView ctrl;
      //necessary because otherwise columnGroupsViews are in reverse order
      for (int i = 0; i < this.DataSet.ColumnGroups.Count(); i++) {
        ctrl = new ColumnGroupView(this.DataSet.ColumnGroups.ElementAt(i), this.commandChain);
        ctrl.Activated += new ColumnGroupActivatedEventHandler(ColumnGroupActivated);
        ctrl.StateChanged += new EventHandler(ColumnGroupStateChanged);
        ctrl.MaxWidth = this.columnGroupMaxWidth;
        if (this.DataSet.ColumnGroups.ElementAt(i).Active) {
          ctrl.ColumnGroupActive = true;
          ctrl.FireActivated(false);
        }
        ctrl.Dock = DockStyle.Top | DockStyle.Bottom;
        this.columnGroupViews.Add(ctrl);
      }
      this.Controls.AddRange(this.columnGroupViews.Reverse<ColumnGroupView>().ToArray());
      this.Invalidate();
      this.ResumeLayout();
    }

    public void DataSetChanged(object sender, EventArgs e) {
      this.Refresh();
      this.UpdateStateInformation();
    }

    public void ColumnGroupActivated(object sender, bool addToActiveColumnGroups) {
      if (!addToActiveColumnGroups) {
        foreach (ColumnGroupView view in this.columnGroupViews)
          view.ColumnGroupActive = view == sender;
      }
      UpdateStateInformation();
    }

    public void ColumnGroupStateChanged(object sender, EventArgs e) {
      UpdateStateInformation();
    }

    private void UpdateStateInformation() {
      DataSetState state = new DataSetState(0, ColumnGroupState.None);
      foreach (ColumnGroupView view in this.columnGroupViews.Where(cg => cg.ColumnGroupActive))
        state.AddColumnGroupState(view.State);
      if (state.ActiveColumnGroups == 1)
        state.SelectedColumns = DataSet.ActiveColumnGroups.ElementAt(0).SelectedColumns.Count();
      if (!this.state.Equals(state))
        this.State = state;
    }

    public event EventHandler StateChanged;
    protected void FireStateChanged() {
      OnStateChanged();
    }

    protected virtual void OnStateChanged() {
      if (StateChanged != null) {
        StateChanged(this, new EventArgs());
      }
    }

    #region GUI interaction with scroll bars
    private Point scrollposition;
    private void DataSetView_Scroll(object sender, ScrollEventArgs e) {
      scrollposition.X = this.DisplayRectangle.X;
      scrollposition.Y = this.DisplayRectangle.Y;
    }

    protected override Point ScrollToControl(Control activeControl) {
      return scrollposition;
    }
    #endregion
  }
}