#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 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.Threading;
using System.Windows.Forms;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.Hive.ExperimentManager.Views {
  /// <summary>
  /// The base class for visual representations of items.
  /// </summary>
  [View("Experiment View")]
  [Content(typeof(HiveExperiment), true)]
  public sealed partial class HiveExperimentView : NamedItemView {
    private ProgressView progressView;

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

    /// <summary>
    /// Initializes a new instance of <see cref="ItemBaseView"/>.
    /// </summary>
    public HiveExperimentView() {
      InitializeComponent();
      downloadExperimentPanel.Dock = DockStyle.Fill;
    }

    protected override void DeregisterContentEvents() {
      Content.ExceptionOccurred -= new EventHandler<EventArgs<Exception>>(Content_ExceptionOccurred);
      Content.ExecutionStateChanged -= new EventHandler(Content_ExecutionStateChanged);
      Content.ExecutionTimeChanged -= new EventHandler(Content_ExecutionTimeChanged);
      Content.Prepared -= new EventHandler(Content_Prepared);
      Content.Started -= new EventHandler(Content_Started);
      Content.Paused -= new EventHandler(Content_Paused);
      Content.Stopped -= new EventHandler(Content_Stopped);
      Content.IsResultsPollingChanged -= new EventHandler(Content_IsResultsPollingChanged);
      Content.HiveJobChanged -= new EventHandler(Content_HiveJobChanged);
      Content.IsProgressingChanged -= new EventHandler(Content_IsProgressingChanged);
      base.DeregisterContentEvents();
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.ExceptionOccurred += new EventHandler<EventArgs<Exception>>(Content_ExceptionOccurred);
      Content.ExecutionStateChanged += new EventHandler(Content_ExecutionStateChanged);
      Content.ExecutionTimeChanged += new EventHandler(Content_ExecutionTimeChanged);
      Content.Prepared += new EventHandler(Content_Prepared);
      Content.Started += new EventHandler(Content_Started);
      Content.Paused += new EventHandler(Content_Paused);
      Content.Stopped += new EventHandler(Content_Stopped);
      Content.IsResultsPollingChanged += new EventHandler(Content_IsResultsPollingChanged);
      Content.HiveJobChanged += new EventHandler(Content_HiveJobChanged);
      Content.IsProgressingChanged += new EventHandler(Content_IsProgressingChanged);
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      if (Content == null) {
        executionTimeTextBox.Text = string.Empty;
        resourceIdsTextBox.Text = string.Empty;
        logView.Content = null;
      } else {
        executionTimeTextBox.Text = Content.ExecutionTime.ToString();
        resourceIdsTextBox.Text = Content.ResourceIds;
        logView.Content = Content.Log;
      }
      Content_HiveJobChanged(this, EventArgs.Empty);
      Content_IsProgressingChanged(this, EventArgs.Empty);
      SetEnabledStateOfControls();
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      executionTimeTextBox.Enabled = Content != null;
      experimentNamedItemView.ReadOnly = true;
      if (Content != null) {
        this.nameTextBox.ReadOnly = Content.ExecutionState != ExecutionState.Prepared;
        this.descriptionTextBox.ReadOnly = Content.ExecutionState != ExecutionState.Prepared;
        this.resourceIdsTextBox.ReadOnly = Content.ExecutionState != ExecutionState.Prepared;
        this.hiveJobView.ReadOnly = Content.ExecutionState != ExecutionState.Prepared;

        viewExperimentButton.Enabled = Content.GetExperiment() != null;

        this.Locked = Content.ExecutionState == ExecutionState.Started && Content.IsPollingResults;
        downloadExperimentPanel.Visible = Content.HiveExperimentId != Guid.Empty && Content.GetExperiment() == null;
      }
      SetEnabledStateOfExecutableButtons();
    }

    protected override void OnClosed(FormClosedEventArgs e) {
      if (Content != null) {
        if (Content.IsPollingResults)
          Content.StopResultPolling();
      }
      base.OnClosed(e);
    }

    #region Content Events
    private void Content_ExecutionStateChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_ExecutionStateChanged), sender, e);
      else
        SetEnabledStateOfControls();
    }
    private void Content_Prepared(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_Prepared), sender, e);
      else {
        nameTextBox.Enabled = descriptionTextBox.Enabled = true;
        Locked = false;
        SetEnabledStateOfControls();
      }
    }
    private void Content_Started(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_Started), sender, e);
      else {
        nameTextBox.Enabled = descriptionTextBox.Enabled = false;
        SetEnabledStateOfControls();
      }
    }
    private void Content_Paused(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_Paused), sender, e);
      else {
        nameTextBox.Enabled = descriptionTextBox.Enabled = true;
        SetEnabledStateOfControls();
      }
    }
    private void Content_Stopped(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_Stopped), sender, e);
      else {
        nameTextBox.Enabled = descriptionTextBox.Enabled = true;
        Locked = false;
        SetEnabledStateOfControls();
      }
    }
    private void Content_ExecutionTimeChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_ExecutionTimeChanged), sender, e);
      else
        executionTimeTextBox.Text = Content.ExecutionTime.ToString();
    }
    private void Content_ExceptionOccurred(object sender, EventArgs<Exception> e) {
      if (InvokeRequired)
        Invoke(new EventHandler<EventArgs<Exception>>(Content_ExceptionOccurred), sender, e);
      else
        ErrorHandling.ShowErrorDialog(this, e.Value);
    }
    private void Content_IsResultsPollingChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_IsResultsPollingChanged), sender, e);
      else {
        SetEnabledStateOfControls();
      }
    }
    void Content_HiveJobChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_HiveJobChanged), sender, e);
      else {
        if (Content != null) {
          hiveJobView.Content = Content.HiveJob;
          experimentNamedItemView.Content = Content.GetExperiment();
        } else {
          hiveJobView.Content = null;
          experimentNamedItemView.Content = null;
        }
        SetEnabledStateOfControls();
      }
    }
    #endregion

    #region Control events
    private void startButton_Click(object sender, EventArgs e) {
      Content.Start();
    }
    private void pauseButton_Click(object sender, EventArgs e) {
      Content.Pause();
    }
    private void stopButton_Click(object sender, EventArgs e) {
      Content.Stop();
    }
    private void resetButton_Click(object sender, EventArgs e) {
      Content.Prepare();
    }

    private void resourceIdsTextBox_Validated(object sender, EventArgs e) {
      Content.ResourceIds = resourceIdsTextBox.Text;
    }

    private void newExperimentButton_Click(object sender, EventArgs e) {
      Content.SetExperiment(new HeuristicLab.Optimization.Experiment());
    }

    private void openExperimentButton_Click(object sender, EventArgs e) {
      OpenFileDialog openFileDialog = new OpenFileDialog();
      openFileDialog.Title = "Open Experimenter";
      openFileDialog.FileName = "Item";
      openFileDialog.Multiselect = false;
      openFileDialog.DefaultExt = "hl";
      openFileDialog.Filter = "HeuristicLab Files|*.hl|All Files|*.*";

      if (openFileDialog.ShowDialog() == DialogResult.OK) {
        Content.SetExperiment((HeuristicLab.Optimization.Experiment)ContentManager.Load(openFileDialog.FileName));
      }
    }

    private void showExperimentButton_Click(object sender, EventArgs e) {
      MainFormManager.MainForm.ShowContent(Content.GetExperiment());
    }

    private void disconnectButton_Click(object sender, EventArgs e) {
      if (Content != null) {
        Content.StopResultPolling();
        SetEnabledStateOfControls();
      }
    }

    private void reconnectButton_Click(object sender, EventArgs e) {
      if (Content != null) {
        Content.StartResultPolling();
        SetEnabledStateOfControls();
      }
    }
    #endregion

    #region Helpers
    private void SetEnabledStateOfExecutableButtons() {
      if (Content == null) {
        startButton.Enabled = pauseButton.Enabled = stopButton.Enabled = resetButton.Enabled = reconnectButton.Enabled = disconnectButton.Enabled = false;
      } else {
        startButton.Enabled = Content.GetExperiment() != null && Content.ExecutionState == ExecutionState.Prepared;
        pauseButton.Enabled = false;
        stopButton.Enabled = Content.ExecutionState == ExecutionState.Started && Content.IsPollingResults;
        resetButton.Enabled = false;
        reconnectButton.Enabled = (Content.ExecutionState == ExecutionState.Started) && !Content.IsPollingResults;
        disconnectButton.Enabled = (Content.ExecutionState == ExecutionState.Started) && Content.IsPollingResults;
      }
    }
    #endregion

    private void downloadExperimentButton_Click(object sender, EventArgs e) {
      var invoker = new MethodInvoker(Content.LoadHiveJob);
      invoker.BeginInvoke((ar) => {
        try {
          invoker.EndInvoke(ar);
        }
        catch (Exception ex) {
          ThreadPool.QueueUserWorkItem(delegate(object exception) { ErrorHandling.ShowErrorDialog(this, (Exception)exception); }, ex);
        }
      }, null);
    }

    private void Content_IsProgressingChanged(object sender, EventArgs e) {
      if (this.InvokeRequired) {
        Invoke(new EventHandler(Content_IsProgressingChanged), sender, e);
      } else {
        if (Content != null && Content.IsProgressing) {
          SetProgressView();
        } else {
          FinishProgressView();
        }
      }
    }

    private void SetProgressView() {
      if (progressView == null) {
        progressView = new ProgressView(this, Content.Progress);
      }
      progressView.Progress = Content.Progress;
    }

    private void FinishProgressView() {
      if (progressView != null) {
        progressView.Finish();
        progressView = null;
        SetEnabledStateOfControls();
      }
    }
  }
}