using System;
using System.Windows.Forms;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;
using HeuristicLab.Optimization;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.Analysis.FitnessLandscape.MultiTrajectory {


  [View("MultiTrajectoryView")]
  [Content(typeof(MultiTrajectoryAnalysis), IsDefaultView = true)]
  public sealed partial class MultiTrajectoryAnalysisView : NamedItemView {

    private TypeSelectorDialog algorithmTypeSelectorDialog;

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

    public MultiTrajectoryAnalysisView() {
      InitializeComponent();
    }

    protected override void DeregisterContentEvents() {
      Content.AlgorithmChanged -= Content_AlgorithmChanged;
      Content.SampleGenerationAlgorithmChanged -= Content_SampleGenerationAlgorithmChanged;
      Content.ExecutionStateChanged -= Content_ExecutionStateChanged;
      Content.ExecutionTimeChanged -= Content_ExecutionTimeChanged;
      base.DeregisterContentEvents();
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.AlgorithmChanged += Content_AlgorithmChanged;
      Content.SampleGenerationAlgorithmChanged += Content_SampleGenerationAlgorithmChanged;
      Content.ExecutionStateChanged += Content_ExecutionStateChanged;
      Content.ExecutionTimeChanged += Content_ExecutionTimeChanged;
    }

    #region Event Handlers (Content)
    void Content_AlgorithmChanged(object sender, EventArgs e) {
      if (InvokeRequired) {
        Invoke(new EventHandler(Content_AlgorithmChanged), sender, e);
      } else {
        algorithmViewHost.Content = Content.Algorithm;
        SetEnabledStateOfControls();
      }
    }
    void Content_SampleGenerationAlgorithmChanged(object sender, EventArgs e) {
      if (InvokeRequired) {
        Invoke(new EventHandler(Content_SampleGenerationAlgorithmChanged), sender, e);
      } else {
        sampleGenerationAlgorithmViewHost.Content = Content.SampleGenerationAlgorithm;
        SetEnabledStateOfControls();
      }
    }
    void Content_ExecutionStateChanged(object sender, EventArgs e) {
      if (InvokeRequired) {
        Invoke(new EventHandler(Content_ExecutionStateChanged), sender, e);
      } else {
        SetEnabledStateOfControls();
      }
    }
    void Content_ExecutionTimeChanged(object sender, EventArgs e) {
      if (InvokeRequired) {
        Invoke(new EventHandler(Content_ExecutionTimeChanged), sender, e);
      } else {
        executionTimeTextBox.Text = Content.ExecutionTime.ToString();
      }
    }
    #endregion

    protected override void OnContentChanged() {
      base.OnContentChanged();
      if (Content == null) {
        parametersView.Content = null;
        sampleGenerationAlgorithmViewHost.Content = null;
        algorithmViewHost.Content = null;
        runCollectionView.Content = null;
        resultCollectionView.Content = null;
        executionTimeTextBox.Text = "--:--";
      } else {
        parametersView.Content = Content.Parameters;
        sampleGenerationAlgorithmViewHost.Content = Content.SampleGenerationAlgorithm;
        algorithmViewHost.Content = Content.Algorithm;
        runCollectionView.Content = Content.Runs;
        resultCollectionView.Content = Content.Results.AsReadOnly();
        executionTimeTextBox.Text = Content.ExecutionTime.ToString();
      }
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      parametersView.Enabled = Content != null && !ReadOnly;
      startButton.Enabled = Content != null && !ReadOnly && Content.ExecutionState != ExecutionState.Started && Content.ExecutionState != ExecutionState.Stopped;
      pauseButton.Enabled = Content != null && !ReadOnly && Content.ExecutionState == ExecutionState.Started;
      stopButton.Enabled = Content != null && !ReadOnly && Content.ExecutionState != ExecutionState.Prepared && Content.ExecutionState != ExecutionState.Stopped;
      prepareButton.Enabled = Content != null && !ReadOnly && Content.ExecutionState != ExecutionState.Paused && Content.ExecutionState != ExecutionState.Started;
    }


    #region Event Handlers (child controls)
    private void newAlgorithmButton_Click(object sender, System.EventArgs e) {
      try {
        IAlgorithm algorithm = SelectAlgorithm();
        if (algorithm != null)
          Content.Algorithm = algorithm;
      } catch (Exception ex) {
        ErrorHandling.ShowErrorDialog(this, ex);
      }
    }
    private void openAlgorithmButton_Click(object sender, System.EventArgs e) {
      LoadAlgorithm(
        () => { newAlgorithmButton.Enabled = openAlgorithmButton.Enabled = algorithmViewHost.Enabled = false; },
        (alg) => { Content.Algorithm = alg; },
        () => { newAlgorithmButton.Enabled = openAlgorithmButton.Enabled = algorithmViewHost.Enabled = true; });
    }
    private void newSampleGenerationAlgorithmButton_Click(object sender, System.EventArgs e) {
      try {
        IAlgorithm algorithm = SelectAlgorithm();
        if (algorithm != null)
          Content.SampleGenerationAlgorithm = algorithm;
      } catch (Exception ex) {
        ErrorHandling.ShowErrorDialog(this, ex);
      }
    }
    private void openSampleGenerationAlgorithmButton_Click(object sender, System.EventArgs e) {
      LoadAlgorithm(
        () => { newSampleGenerationAlgorithmButton.Enabled = openSampleGenerationAlgorithmButton.Enabled = sampleGenerationAlgorithmViewHost.Enabled = false; },
        (alg) => { Content.SampleGenerationAlgorithm = alg; },
        () => { newSampleGenerationAlgorithmButton.Enabled = openSampleGenerationAlgorithmButton.Enabled = sampleGenerationAlgorithmViewHost.Enabled = true; });
    }
    private void startButton_Click(object sender, System.EventArgs e) {
      Content.StartAsync();
    }
    private void pauseButton_Click(object sender, System.EventArgs e) {
      Content.Pause();
    }
    private void stopButton_Click(object sender, System.EventArgs e) {
      Content.Stop();
    }
    private void prepareButton_Click(object sender, System.EventArgs e) {
      Content.Prepare();
    }
    private void algorithmTabPage_DragEnterOver(object sender, DragEventArgs e) {
      e.Effect = DragDropEffects.None;      
      if (!ReadOnly && e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat) is IAlgorithm) {
        if ((e.KeyState & 32) == 32) e.Effect = DragDropEffects.Link;  // ALT key
        else if ((e.KeyState & 4) == 4) e.Effect = DragDropEffects.Move;  // SHIFT key
        else if ((e.AllowedEffect & DragDropEffects.Copy) == DragDropEffects.Copy) e.Effect = DragDropEffects.Copy;
        else if ((e.AllowedEffect & DragDropEffects.Move) == DragDropEffects.Move) e.Effect = DragDropEffects.Move;
        else if ((e.AllowedEffect & DragDropEffects.Link) == DragDropEffects.Link) e.Effect = DragDropEffects.Link;
      }
    }
    private void algorithmTabPage_DragDrop(object sender, DragEventArgs e) {
      if (e.Effect != DragDropEffects.None) {
        IAlgorithm algorithm = e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat) as IAlgorithm;
        if (e.Effect.HasFlag(DragDropEffects.Copy)) algorithm = (IAlgorithm)algorithm.Clone();
        if (sender == algorithmTabPage)
          Content.Algorithm = algorithm;
        if (sender == sampleGenerationTabPage)
          Content.SampleGenerationAlgorithm = algorithm;
      }
    }
    #endregion

    #region Auxiliary Functions
    private IAlgorithm SelectAlgorithm() {
      if (algorithmTypeSelectorDialog == null) {
        algorithmTypeSelectorDialog = new TypeSelectorDialog();
        algorithmTypeSelectorDialog.Caption = "Select Algorithm";
        algorithmTypeSelectorDialog.TypeSelector.Caption = "Available Algorithms";
        algorithmTypeSelectorDialog.TypeSelector.Configure(typeof(IAlgorithm), false, false);
      }
      if (algorithmTypeSelectorDialog.ShowDialog(this) == DialogResult.OK) {
        return (IAlgorithm)algorithmTypeSelectorDialog.TypeSelector.CreateInstanceOfSelectedType();
      }
      return null;
    }
    private void LoadAlgorithm(Action pre, Action<IAlgorithm> set, Action post) {
      openFileDialog.Title = "Open Algorithm";
      if (openFileDialog.ShowDialog(this) == DialogResult.OK) {
        if (InvokeRequired) {
          Invoke(pre);
        } else {
          pre();
        }
        ContentManager.LoadAsync(openFileDialog.FileName, delegate(IStorableContent content, Exception error) {
          try {
            if (error != null) throw error;
            IAlgorithm algorithm = content as IAlgorithm;
            if (algorithm == null)
              Invoke(new Action(() =>
                MessageBox.Show(this, "The selected file does not contain an algorithm.", "Invalid File", MessageBoxButtons.OK, MessageBoxIcon.Error)));
            else
              set(algorithm);
          } catch (Exception ex) {
            Invoke(new Action(() => ErrorHandling.ShowErrorDialog(this, ex)));
          } finally {
            Invoke(post);
          }
        });
      }
    }
    #endregion
  }
}