#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.Linq;
using System.Windows.Forms;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;
using HeuristicLab.MainForm.WindowsForms;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.Clients.OKB {
  [View("OKBItem View")]
  [Content(typeof(OKBExperiment), true)]
  public sealed partial class OKBExperimentView : NamedItemView {
    public new OKBExperiment Content {
      get { return (OKBExperiment)base.Content; }
      set { base.Content = value; }
    }

    public OKBExperimentView() {
      InitializeComponent();
    }

    protected override void OnInitialized(System.EventArgs e) {
      base.OnInitialized(e);
      OKBClient.Instance.Refreshing += new EventHandler(OKBClient_Refreshing);
      OKBClient.Instance.Refreshed += new EventHandler(OKBClient_Refreshed);
      PopulateComboBoxes();
    }

    protected override void DeregisterContentEvents() {
      Content.AlgorithmIdChanged -= new EventHandler(Content_AlgorithmIdChanged);
      Content.ProblemIdChanged -= new EventHandler(Content_ProblemIdChanged);
      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);
      base.DeregisterContentEvents();
    }
    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.AlgorithmIdChanged += new EventHandler(Content_AlgorithmIdChanged);
      Content.ProblemIdChanged += new EventHandler(Content_ProblemIdChanged);
      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);
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      if (Content == null) {
        algorithmComboBox.SelectedIndex = -1;
        problemComboBox.SelectedIndex = -1;
        problemParametersViewHost.Content = null;
        algorithmParametersViewHost.Content = null;
        resultsViewHost.Content = null;
        runsViewHost.Content = null;
        executionTimeTextBox.Text = "-";
      } else {
        algorithmComboBox.SelectedItem = OKBClient.Instance.Algorithms.FirstOrDefault(x => x.Id == Content.AlgorithmId);
        problemComboBox.SelectedItem = OKBClient.Instance.Problems.FirstOrDefault(x => x.Id == Content.ProblemId);
        problemParametersViewHost.Content = Content.ProblemParameters;
        algorithmParametersViewHost.Content = Content.AlgorithmParameters;
        resultsViewHost.Content = Content.Results;
        runsViewHost.Content = Content.Runs;
        executionTimeTextBox.Text = Content.ExecutionTime.ToString();
      }
    }
    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      algorithmComboBox.Enabled = (Content != null) && !ReadOnly && !Locked && (algorithmComboBox.Items.Count > 0);
      problemComboBox.Enabled = (Content != null) && !ReadOnly && !Locked && (problemComboBox.Items.Count > 0);
      tabControl.Enabled = Content != null;
      executionTimeTextBox.Enabled = Content != null;
      SetEnabledStateOfExecutableButtons();
    }

    private void PopulateComboBoxes() {
      algorithmComboBox.DataSource = null;
      problemComboBox.DataSource = null;
      Platform platform = OKBClient.Instance.Platforms.FirstOrDefault(x => x.Name == "HeuristicLab 3.3");
      if (platform != null) {
        algorithmComboBox.DataSource = OKBClient.Instance.Algorithms.Where(x => x.PlatformId == platform.Id).ToList();
        algorithmComboBox.DisplayMember = "Name";
        problemComboBox.DataSource = OKBClient.Instance.Problems.Where(x => x.PlatformId == platform.Id).ToList();
        problemComboBox.DisplayMember = "Name";
      }
    }

    protected override void OnClosed(FormClosedEventArgs e) {
      if ((Content != null) && (Content.ExecutionState == ExecutionState.Started)) Content.Stop();
      OKBClient.Instance.Refreshing -= new EventHandler(OKBClient_Refreshing);
      OKBClient.Instance.Refreshed -= new EventHandler(OKBClient_Refreshed);
      base.OnClosed(e);
    }

    private void OKBClient_Refreshing(object sender, EventArgs e) {
      if (InvokeRequired) {
        Invoke(new EventHandler(OKBClient_Refreshing), sender, e);
      } else {
        Cursor = Cursors.AppStarting;
        algorithmComboBox.Enabled = problemComboBox.Enabled = tabControl.Enabled = prepareButton.Enabled = startButton.Enabled = pauseButton.Enabled = stopButton.Enabled = executionTimeTextBox.Enabled = false;
      }
    }
    private void OKBClient_Refreshed(object sender, EventArgs e) {
      if (InvokeRequired) {
        Invoke(new EventHandler(OKBClient_Refreshed), sender, e);
      } else {
        PopulateComboBoxes();
        SetEnabledStateOfControls();
        Cursor = Cursors.Default;
      }
    }

    #region Content Events
    private void Content_AlgorithmIdChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_AlgorithmIdChanged), sender, e);
      else {
        algorithmComboBox.SelectedItem = OKBClient.Instance.Algorithms.FirstOrDefault(x => x.Id == Content.AlgorithmId);
        algorithmParametersViewHost.Content = Content.AlgorithmParameters;
        resultsViewHost.Content = Content.Results;
        runsViewHost.Content = Content.Runs;
        executionTimeTextBox.Text = Content.ExecutionTime.ToString();
        SetEnabledStateOfExecutableButtons();
      }
    }
    private void Content_ProblemIdChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_ProblemIdChanged), sender, e);
      else {
        problemComboBox.SelectedItem = OKBClient.Instance.Problems.FirstOrDefault(x => x.Id == Content.ProblemId);
        problemParametersViewHost.Content = Content.ProblemParameters;
        SetEnabledStateOfExecutableButtons();
      }
    }
    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_ExecutionStateChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_ExecutionStateChanged), sender, e);
      else
        startButton.Enabled = pauseButton.Enabled = stopButton.Enabled = prepareButton.Enabled = false;
    }
    private void Content_ExecutionTimeChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_ExecutionTimeChanged), sender, e);
      else
        executionTimeTextBox.Text = Content == null ? "-" : Content.ExecutionTime.ToString();
    }
    private void Content_Prepared(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_Prepared), sender, e);
      else {
        resultsViewHost.Content = Content.Results;
        ReadOnly = Locked = false;
        SetEnabledStateOfExecutableButtons();
      }
    }
    private void Content_Started(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_Started), sender, e);
      else {
        ReadOnly = Locked = true;
        SetEnabledStateOfExecutableButtons();
      }
    }
    private void Content_Paused(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_Paused), sender, e);
      else {
        ReadOnly = Locked = false;
        SetEnabledStateOfExecutableButtons();
      }
    }
    private void Content_Stopped(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_Stopped), sender, e);
      else {
        ReadOnly = Locked = false;
        SetEnabledStateOfExecutableButtons();
      }
    }
    #endregion

    #region Control Events
    private void refreshButton_Click(object sender, System.EventArgs e) {
      OKBClient.Instance.Refresh();
    }
    private void algorithmComboBox_SelectedValueChanged(object sender, System.EventArgs e) {
      Algorithm algorithm = algorithmComboBox.SelectedValue as Algorithm;
      if (Content != null) Content.Load(algorithm);
    }
    private void problemComboBox_SelectedValueChanged(object sender, System.EventArgs e) {
      Problem problem = problemComboBox.SelectedValue as Problem;
      if (Content != null) Content.Load(problem);
    }
    private void prepareButton_Click(object sender, EventArgs e) {
      Content.Prepare(false);
    }
    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();
    }
    #endregion

    #region Helpers
    private void SetEnabledStateOfExecutableButtons() {
      if ((Content == null) || (Content.AlgorithmId == 0) || (Content.ProblemId == 0)) {
        startButton.Enabled = pauseButton.Enabled = stopButton.Enabled = prepareButton.Enabled = false;
      } else {
        startButton.Enabled = (Content.ExecutionState == ExecutionState.Prepared) || (Content.ExecutionState == ExecutionState.Paused);
        pauseButton.Enabled = Content.ExecutionState == ExecutionState.Started;
        stopButton.Enabled = (Content.ExecutionState == ExecutionState.Started) || (Content.ExecutionState == ExecutionState.Paused);
        prepareButton.Enabled = Content.ExecutionState != ExecutionState.Started;
      }
    }
    #endregion
  }
}