#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 HeuristicLab.Common;
using HeuristicLab.MainForm;
using HeuristicLab.MainForm.WindowsForms;
using HeuristicLab.OptimizationExpertSystem.Common;
using System;
using System.Windows.Forms;

namespace HeuristicLab.OptimizationExpertSystem {
  public partial class OptimizationKnowledgeCenter : DockingMainForm {
    private ToolStripProgressBar progressBar;
    private ToolStripLabel progressLabel;

    public KnowledgeCenter ExpertSystem { get; private set; }
    
    public OptimizationKnowledgeCenter(Type userInterfaceType) : base(userInterfaceType) {
      InitializeComponent();
      ExpertSystem = new KnowledgeCenter();
      ExpertSystem.DownloadStarted += ExpertSystemOnDownloadStarted;
      ShowContentInViewHost = false;
    }

    private void ExpertSystemOnDownloadStarted(object sender, EventArgs<IProgress> e) {
      if (InvokeRequired) { Invoke((Action<object, EventArgs<IProgress>>)ExpertSystemOnDownloadStarted, sender, e); return; }
      e.Value.ProgressStateChanged += OnProgressStateChanged;
      e.Value.ProgressValueChanged += OnProgressValueChanged;
      e.Value.StatusChanged += OnProgressStatusChanged;
      progressBar.Value = progressBar.Minimum;
      progressLabel.Text = string.Empty;
      progressBar.Visible = true;
      progressLabel.Visible = true;
    }

    private void OnProgressStateChanged(object sender, EventArgs e) {
      if (InvokeRequired) { Invoke((Action<object, EventArgs>)OnProgressStateChanged, sender, e); return; }
      var progress = (IProgress)sender;
      if (progress.ProgressState == ProgressState.Canceled
          || progress.ProgressState == ProgressState.Finished) {
        progress.ProgressStateChanged -= OnProgressStateChanged;
        progress.ProgressValueChanged -= OnProgressValueChanged;
        progress.StatusChanged -= OnProgressStatusChanged;
        progressBar.Visible = false;
        progressLabel.Visible = false;
      }
    }

    private void OnProgressValueChanged(object sender, EventArgs e) {
      if (InvokeRequired) { Invoke((Action<object, EventArgs>)OnProgressValueChanged, sender, e); return; }
      var progress = (IProgress)sender;
      progressBar.Value = Math.Max(progressBar.Minimum, Math.Min(progressBar.Maximum, (int)(progress.ProgressValue * 100)));
    }

    private void OnProgressStatusChanged(object sender, EventArgs e) {
      if (InvokeRequired) { Invoke((Action<object, EventArgs>)OnProgressStatusChanged, sender, e); return; }
      var progress = (IProgress)sender;
      progressLabel.Text = progress.Status.Replace(Environment.NewLine, "   ");
    }

    protected override void AdditionalCreationOfGuiElements() {
      base.AdditionalCreationOfGuiElements();
      progressBar = new ToolStripProgressBar();
      statusStrip.Items.Add(progressBar);
      progressLabel = new ToolStripLabel();
      statusStrip.Items.Add(progressLabel);
    }

    private void OptimizationExpertSystem_Load(object sender, EventArgs e) {
      ShowContent(ExpertSystem.Problem);
    }
  }
}