package jalview.gui;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JInternalFrame;
import javax.swing.JMenuItem;
import javax.swing.event.InternalFrameAdapter;
import javax.swing.event.InternalFrameEvent;

import jalview.api.AlignmentViewPanel;
import jalview.api.FeatureRenderer;
import jalview.bin.Cache;
import jalview.datamodel.PDBEntry;
import jalview.datamodel.SequenceI;
import jalview.gui.StructureViewer.ViewerType;
import jalview.io.DataSourceType;
import jalview.io.StructureFile;
import jalview.structures.models.AAStructureBindingModel;
import jalview.util.MessageManager;

public class PymolViewer extends StructureViewerBase
{
  private static final int myWidth = 500;

  private static final int myHeight = 150;

  private PymolBindingModel binding;

  private String pymolSessionFile;

  public PymolViewer()
  {
    super();

    /*
     * closeViewer will decide whether or not to close this frame
     * depending on whether user chooses to Cancel or not
     */
    setDefaultCloseOperation(JInternalFrame.DO_NOTHING_ON_CLOSE);
  }

  public PymolViewer(PDBEntry pdb, SequenceI[] seqs, Object object,
          AlignmentPanel ap)
  {
    this();
    openNewPymol(ap, new PDBEntry[] { pdb },
            new SequenceI[][]
            { seqs });
  }

  public PymolViewer(PDBEntry[] pe, boolean alignAdded, SequenceI[][] seqs,
          AlignmentPanel ap)
  {
    this();
    setAlignAddedStructures(alignAdded);
    openNewPymol(ap, pe, seqs);
  }

  /**
   * Constructor given a session file to be restored
   * 
   * @param sessionFile
   * @param alignPanel
   * @param pdbArray
   * @param seqsArray
   * @param colourByPymol
   * @param colourBySequence
   * @param newViewId
   */
  public PymolViewer(String sessionFile, AlignmentPanel alignPanel,
          PDBEntry[] pdbArray, SequenceI[][] seqsArray,
          boolean colourByPymol, boolean colourBySequence, String newViewId)
  {
    // TODO convert to base/factory class method
    this();
    setViewId(newViewId);
    this.pymolSessionFile = sessionFile;
    openNewPymol(alignPanel, pdbArray, seqsArray);
    if (colourByPymol)
    {
      binding.setColourBySequence(false);
      seqColour.setSelected(false);
      viewerColour.setSelected(true);
    }
    else if (colourBySequence)
    {
      binding.setColourBySequence(true);
      seqColour.setSelected(true);
      viewerColour.setSelected(false);
    }
  }

  private void openNewPymol(AlignmentPanel ap, PDBEntry[] pe,
          SequenceI[][] seqs)
  {
    createProgressBar();
    binding = new PymolBindingModel(this, ap.getStructureSelectionManager(),
            pe, seqs);
    addAlignmentPanel(ap);
    useAlignmentPanelForColourbyseq(ap);

    if (pe.length > 1)
    {
      useAlignmentPanelForSuperposition(ap);
    }
    binding.setColourBySequence(true);
    setSize(myWidth, myHeight);
    initMenus();
    viewerActionMenu.setText("PyMOL");
    updateTitleAndMenus();

    addingStructures = false;
    worker = new Thread(this);
    worker.start();

    this.addInternalFrameListener(new InternalFrameAdapter()
    {
      @Override
      public void internalFrameClosing(
              InternalFrameEvent internalFrameEvent)
      {
        closeViewer(false);
      }
    });

  }

  /**
   * Create a helper to manage progress bar display
   */
  protected void createProgressBar()
  {
    if (getProgressIndicator() == null)
    {
      setProgressIndicator(new ProgressBar(statusPanel, statusBar));
    }
  }

  @Override
  public void run()
  {
    // todo pull up much of this
  
    StringBuilder errormsgs = new StringBuilder(128);
    List<PDBEntry> filePDB = new ArrayList<>();
    List<Integer> filePDBpos = new ArrayList<>();
    String[] curfiles = binding.getStructureFiles(); // files currently in viewer
    for (int pi = 0; pi < binding.getPdbCount(); pi++)
    {
      String file = null;
      PDBEntry thePdbEntry = binding.getPdbEntry(pi);
      if (thePdbEntry.getFile() == null)
      {
        /*
         * Retrieve PDB data, save to file, attach to PDBEntry
         */
        file = fetchPdbFile(thePdbEntry);
        if (file == null)
        {
          errormsgs.append("'" + thePdbEntry.getId() + "' ");
        }
      }
      else
      {
        /*
         * got file already
         */
        file = new File(thePdbEntry.getFile()).getAbsoluteFile()
                .getPath();
        // todo - skip if already loaded in PyMOL
      }
      if (file != null)
      {
        filePDB.add(thePdbEntry);
        filePDBpos.add(Integer.valueOf(pi));
      }
    }
        
    if (!filePDB.isEmpty())
    {
      /*
       * at least one structure to add to viewer
       */
      binding.setFinishedInit(false);
      if (!addingStructures)
      {
        try
        {
          initPymol();
        } catch (Exception ex)
        {
          Cache.log.error("Couldn't open PyMOL viewer!", ex);
        }
      }
      int num = -1;
      for (PDBEntry pe : filePDB)
      {
        num++;
        if (pe.getFile() != null)
        {
          try
          {
            int pos = filePDBpos.get(num).intValue();
            long startTime = startProgressBar(getViewerName() + " "
                    + MessageManager.getString("status.opening_file_for")
                    + " " + pe.getId());
            binding.openFile(pe);
            binding.addSequence(pos, binding.getSequence()[pos]);
            File fl = new File(pe.getFile());
            DataSourceType protocol = DataSourceType.URL;
            try
            {
              if (fl.exists())
              {
                protocol = DataSourceType.FILE;
              }
            } catch (Throwable e)
            {
            } finally
            {
              stopProgressBar("", startTime);
            }

            StructureFile pdb = binding.getSsm().setMapping(
                    binding.getSequence()[pos], binding.getChains()[pos],
                    pe.getFile(), protocol,
                    getProgressIndicator());
            binding.stashFoundChains(pdb, pe.getFile());
          } catch (Exception ex)
          {
            Cache.log.error(
                    "Couldn't open " + pe.getFile() + " in Chimera viewer!",
                    ex);
          } finally
          {
            // Cache.log.debug("File locations are " + files);
          }
        }
      }

      binding.refreshGUI();
      binding.setFinishedInit(true);
      binding.setLoadingFromArchive(false);

      /*
       * ensure that any newly discovered features (e.g. RESNUM)
       * are added to any open feature settings dialog
       */
      FeatureRenderer fr = getBinding().getFeatureRenderer(null);
      if (fr != null)
      {
        fr.featuresAdded();
      }

      // refresh the sequence colours for the new structure(s)
      for (AlignmentViewPanel ap : _colourwith)
      {
        binding.updateColours(ap);
      }
      // do superposition if asked to
      if (alignAddedStructures)
      {
        new Thread(new Runnable()
        {
          @Override
          public void run()
          {
            alignStructsWithAllAlignPanels();
          }
        }).start();
      }
      addingStructures = false;
    }
    _started = false;
    worker = null;

  }

  /**
   * Launch PyMOL. If we have a session file name, send PyMOL the command to
   * open its saved session file.
   */
  void initPymol()
  {
    Desktop.addInternalFrame(this,
            binding.getViewerTitle(getViewerName(), true),
            getBounds().width, getBounds().height);

    if (!binding.launchPymol())
    {
      JvOptionPane.showMessageDialog(Desktop.desktop,
              MessageManager.formatMessage("label.open_viewer_failed",
                      getViewerName()),
              MessageManager.getString("label.error_loading_file"),
              JvOptionPane.ERROR_MESSAGE);
      this.dispose();
      return;
    }

    if (this.pymolSessionFile != null)
    {
      boolean opened = binding.openSession(pymolSessionFile);
      if (!opened)
      {
        System.err.println("An error occurred opening PyMOL session file "
                + pymolSessionFile);
      }
    }
    // binding.startPymolListener();
  }

  @Override
  public AAStructureBindingModel getBinding()
  {
    return binding;
  }

  @Override
  public ViewerType getViewerType()
  {
    return ViewerType.PYMOL;
  }

  @Override
  protected String getViewerName()
  {
    return "PyMOL";
  }

  @Override
  protected void initMenus()
  {
    super.initMenus();

    savemenu.setVisible(false); // not yet implemented
    viewMenu.add(fitToWindow);

    JMenuItem writeFeatures = new JMenuItem(
            MessageManager.getString("label.create_viewer_attributes"));
    writeFeatures.setToolTipText(MessageManager
            .getString("label.create_viewer_attributes_tip"));
    writeFeatures.addActionListener(new ActionListener()
    {
      @Override
      public void actionPerformed(ActionEvent e)
      {
        sendFeaturesToPymol();
      }
    });
    viewerActionMenu.add(writeFeatures);
  }

  protected void sendFeaturesToPymol()
  {
    int count = binding.sendFeaturesToViewer(getAlignmentPanel());
    statusBar.setText(
            MessageManager.formatMessage("label.attributes_set", count));
  }

}