/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.openapi.vcs.history;

import com.intellij.history.LocalHistory;
import com.intellij.history.LocalHistoryAction;
import com.intellij.icons.AllIcons;
import com.intellij.openapi.actionSystem.*;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.application.ModalityState;
import com.intellij.openapi.command.CommandProcessor;
import com.intellij.openapi.command.WriteCommandAction;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.fileEditor.OpenFileDescriptor;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.progress.ProcessCanceledException;
import com.intellij.openapi.progress.ProgressIndicator;
import com.intellij.openapi.progress.ProgressManager;
import com.intellij.openapi.progress.Task;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.project.DumbAwareAction;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.Messages;
import com.intellij.openapi.ui.PanelWithActionsAndCloseButton;
import com.intellij.openapi.ui.Splitter;
import com.intellij.openapi.util.*;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.vcs.*;
import com.intellij.openapi.vcs.annotate.AnnotationProvider;
import com.intellij.openapi.vcs.annotate.FileAnnotation;
import com.intellij.openapi.vcs.annotate.ShowAllAffectedGenericAction;
import com.intellij.openapi.vcs.changes.*;
import com.intellij.openapi.vcs.changes.actions.CreatePatchFromChangesAction;
import com.intellij.openapi.vcs.changes.committed.AbstractCalledLater;
import com.intellij.openapi.vcs.changes.issueLinks.IssueLinkHtmlRenderer;
import com.intellij.openapi.vcs.changes.issueLinks.IssueLinkRenderer;
import com.intellij.openapi.vcs.changes.issueLinks.TableLinkMouseListener;
import com.intellij.openapi.vcs.impl.BackgroundableActionEnabledHandler;
import com.intellij.openapi.vcs.impl.ProjectLevelVcsManagerImpl;
import com.intellij.openapi.vcs.impl.VcsBackgroundableActions;
import com.intellij.openapi.vcs.ui.ReplaceFileConfirmationDialog;
import com.intellij.openapi.vcs.versionBrowser.CommittedChangeList;
import com.intellij.openapi.vcs.vfs.VcsFileSystem;
import com.intellij.openapi.vcs.vfs.VcsVirtualFile;
import com.intellij.openapi.vcs.vfs.VcsVirtualFolder;
import com.intellij.openapi.vfs.ReadonlyStatusHandler;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.ui.*;
import com.intellij.ui.content.ContentManager;
import com.intellij.ui.dualView.*;
import com.intellij.ui.table.TableView;
import com.intellij.util.*;
import com.intellij.util.text.DateFormatUtil;
import com.intellij.util.ui.*;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;
import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.event.InputEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.*;
import java.util.List;

/**
 * author: lesya
 */
public class FileHistoryPanelImpl extends PanelWithActionsAndCloseButton {
  private static final Logger LOG = Logger.getInstance("#com.intellij.cvsSupport2.ui.FileHistoryDialog");

  @NotNull private final Project myProject;
  private final JEditorPane myComments;
  private JComponent myAdditionalDetails;
  private Consumer<VcsFileRevision> myListener;
  private String myOriginalComment = "";
  private final DefaultActionGroup myPopupActions;

  private final AbstractVcs myVcs;
  private final VcsHistoryProvider myProvider;
  private final AnnotationProvider myAnnotationProvider;
  private VcsHistorySession myHistorySession;
  private final FilePath myFilePath;
  private final FileHistoryRefresherI myRefresherI;
  private VcsFileRevision myBottomRevisionForShowDiff;
  private final DualView myDualView;

  @NotNull private final DiffFromHistoryHandler myDiffHandler;

  private final Alarm myUpdateAlarm;

  private volatile boolean myInRefresh;
  private List<Object> myTargetSelection;
  private final AsynchConsumer<VcsHistorySession> myHistoryPanelRefresh;

  private static final String COMMIT_MESSAGE_TITLE = VcsBundle.message("label.selected.revision.commit.message");
  @NonNls private static final String VCS_HISTORY_ACTIONS_GROUP = "VcsHistoryActionsGroup";

  private final Map<VcsRevisionNumber, Integer> myRevisionsOrder;
  private boolean myIsStaticAndEmbedded;
  private final Splitter myDetailsSplitter = new Splitter(false, 0.5f);

  private final Comparator<VcsFileRevision> myRevisionsInOrderComparator = new Comparator<VcsFileRevision>() {
    @Override
    public int compare(VcsFileRevision o1, VcsFileRevision o2) {
      // descending
      return Comparing.compare(myRevisionsOrder.get(o2.getRevisionNumber()), myRevisionsOrder.get(o1.getRevisionNumber()));
    }
  };

  private final DualViewColumnInfo REVISION =
    new VcsColumnInfo<VcsRevisionNumber>(VcsBundle.message("column.name.revision.version")) {
      protected VcsRevisionNumber getDataOf(VcsFileRevision object) {
        return object.getRevisionNumber();
      }

      @Override
      public Comparator<VcsFileRevision> getComparator() {
        return myRevisionsInOrderComparator;
      }

      public String valueOf(VcsFileRevision object) {
        final VcsRevisionNumber revisionNumber = object.getRevisionNumber();
        return revisionNumber instanceof ShortVcsRevisionNumber ? ((ShortVcsRevisionNumber)revisionNumber).toShortString() : revisionNumber.asString();
      }

      @Override
      public String getPreferredStringValue() {
        return "123.4567";
      }

    };

  private final DualViewColumnInfo DATE = new VcsColumnInfo<String>(VcsBundle.message("column.name.revision.date")) {
    protected String getDataOf(VcsFileRevision object) {
      Date date = object.getRevisionDate();
      if (date == null) return "";
      return DateFormatUtil.formatPrettyDateTime(date);
    }

    public int compare(VcsFileRevision o1, VcsFileRevision o2) {
      return Comparing.compare(o1.getRevisionDate(), o2.getRevisionDate());
    }

    @Override
    public String getPreferredStringValue() {
      return DateFormatUtil.formatPrettyDateTime(Clock.getTime());
    }

  };
  private boolean myColumnSizesSet;

  public void scheduleRefresh(final boolean canUseLastRevision) {
    ApplicationManager.getApplication().invokeLater(new Runnable() {
      @Override
      public void run() {
        refreshImpl(canUseLastRevision);
      }
    });
  }

  private static class AuthorCellRenderer extends DefaultTableCellRenderer {
    private String myTooltipText;

    public void setTooltipText(final String text) {
      myTooltipText = text;
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
      final Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
      if (c instanceof JComponent) {
        ((JComponent)c).setToolTipText(myTooltipText);
      }
      if (isSelected || hasFocus) {
        c.setBackground(table.getSelectionBackground());
        c.setForeground(table.getSelectionForeground());
      } else {
        c.setBackground(table.getBackground());
        c.setForeground(table.getForeground());
      }

      return c;
    }
  }

  private static final TableCellRenderer AUTHOR_RENDERER = new AuthorCellRenderer();

  private final DualViewColumnInfo AUTHOR = new VcsColumnInfo<String>(VcsBundle.message("column.name.revision.list.author")) {
    protected String getDataOf(VcsFileRevision object) {
      VcsFileRevision rev = object;
      if (object instanceof TreeNodeOnVcsRevision) {
        rev = ((TreeNodeOnVcsRevision)object).getRevision();
      }

      if (rev instanceof VcsFileRevisionEx) {
        if (!rev.getAuthor().equals(((VcsFileRevisionEx)rev).getCommitterName())) return object.getAuthor() + "*";
      }

      return object.getAuthor();
    }

    @Override
    public TableCellRenderer getRenderer(VcsFileRevision revision) {
      return AUTHOR_RENDERER;
    }

    @Override
    public TableCellRenderer getCustomizedRenderer(VcsFileRevision value, TableCellRenderer renderer) {
      if (renderer instanceof AuthorCellRenderer) {
        VcsFileRevision revision = value;
        if (value instanceof TreeNodeOnVcsRevision) {
          revision = ((TreeNodeOnVcsRevision)value).getRevision();
        }

        if (revision instanceof VcsFileRevisionEx) {
          final VcsFileRevisionEx ex = (VcsFileRevisionEx)revision;
          final StringBuilder sb = new StringBuilder(ex.getAuthor());
          if (ex.getAuthorEmail() != null) sb.append(" &lt;").append(ex.getAuthorEmail()).append("&gt;");
          if (ex.getCommitterName() != null && !ex.getAuthor().equals(ex.getCommitterName())) {
            sb.append(", via ").append(ex.getCommitterName());
            if (ex.getCommitterEmail() != null) sb.append(" &lt;").append(ex.getCommitterEmail()).append("&gt;");
          }
          ((AuthorCellRenderer)renderer).setTooltipText(sb.toString());
        }
      }

      return renderer;
    }

    @Override
    @NonNls
    public String getPreferredStringValue() {
      return "author_author";
    }

 };

  private Splitter mySplitter;


  private static class MessageRenderer extends ColoredTableCellRenderer {
    private final IssueLinkRenderer myIssueLinkRenderer;

    public MessageRenderer(Project project) {
      myIssueLinkRenderer = new IssueLinkRenderer(project, this);
    }

    protected void customizeCellRenderer(JTable table, Object value, boolean selected, boolean hasFocus, int row, int column) {
      setOpaque(selected);
      if (value instanceof String) {
        String message = (String) value;
        myIssueLinkRenderer.appendTextWithLinks(message);
      }
    }


  }

  private static class MessageColumnInfo extends VcsColumnInfo<String> {
    private final MessageRenderer myRenderer;

    public MessageColumnInfo(Project project) {
      super(FileHistoryPanelImpl.COMMIT_MESSAGE_TITLE);
      myRenderer = new MessageRenderer(project);
    }

    protected String getDataOf(VcsFileRevision object) {
      final String originalMessage = object.getCommitMessage();
      if (originalMessage != null) {
        String commitMessage = originalMessage.trim();
        int index13 = commitMessage.indexOf('\r');
        int index10 = commitMessage.indexOf('\n');

        if (index10 < 0 && index13 < 0) {
          return commitMessage;
        }
        else {
          return commitMessage.substring(0, getSuitableIndex(index10, index13)) + "...";
        }
      }
      else {
        return "";
      }
    }

    @Override
    public String getPreferredStringValue() {
      return StringUtil.repeatSymbol('a', 125);
    }

    public TableCellRenderer getRenderer(VcsFileRevision p0) {
      return myRenderer;
    }

  }

  private static int getSuitableIndex(int index10, int index13) {
    if (index10 < 0) {
      return index13;
    }
    else if (index13 < 0) {
      return index10;
    }
    else {
      return Math.min(index10, index13);
    }
  }


  private final Map<VcsFileRevision, VirtualFile> myRevisionToVirtualFile = new HashMap<VcsFileRevision, VirtualFile>();

  public FileHistoryPanelImpl(AbstractVcs vcs,
                              FilePath filePath, VcsHistorySession session,
                              VcsHistoryProvider provider,
                              ContentManager contentManager, final FileHistoryRefresherI refresherI) {
    this(vcs, filePath, session, provider, contentManager, refresherI, false);
  }

  public FileHistoryPanelImpl(AbstractVcs vcs,
                              FilePath filePath, VcsHistorySession session,
                              VcsHistoryProvider provider,
                              ContentManager contentManager, final FileHistoryRefresherI refresherI, final boolean isStaticEmbedded) {
    super(contentManager, provider.getHelpId() != null ? provider.getHelpId() : "reference.versionControl.toolwindow.history", ! isStaticEmbedded);
    myProject = vcs.getProject();
    myIsStaticAndEmbedded = false;
    myVcs = vcs;
    myProvider = provider;
    myAnnotationProvider = myVcs.getCachingAnnotationProvider();
    myRefresherI = refresherI;
    myHistorySession = session;         
    myFilePath = filePath;

    DiffFromHistoryHandler customDiffHandler = provider.getHistoryDiffHandler();
    myDiffHandler = customDiffHandler == null ? new StandardDiffFromHistoryHandler() : customDiffHandler;

    final DualViewColumnInfo[] columns = createColumnList(myVcs.getProject(), provider, session);

    myComments = new JEditorPane(UIUtil.HTML_MIME, "");
    myComments.setPreferredSize(new Dimension(150, 100));
    myComments.setEditable(false);
    myComments.setBackground(UIUtil.getComboBoxDisabledBackground());
    myComments.addHyperlinkListener(new BrowserHyperlinkListener());

    myRevisionsOrder = new HashMap<VcsRevisionNumber, Integer>();
    refreshRevisionsOrder();

    replaceTransferable();

    myUpdateAlarm = new Alarm(Alarm.ThreadToUse.POOLED_THREAD, myProject);

    final HistoryAsTreeProvider treeHistoryProvider = myHistorySession.getHistoryAsTreeProvider();

    @NonNls String storageKey = "FileHistory." + provider.getClass().getName();
    if (treeHistoryProvider != null) {
      myDualView = new DualView(new TreeNodeOnVcsRevision(null, treeHistoryProvider.createTreeOn(myHistorySession.getRevisionList())),
                                columns, storageKey, myVcs.getProject());
    }
    else {
      myDualView = new DualView(new TreeNodeOnVcsRevision(null, wrapWithTreeElements(myHistorySession.getRevisionList())), columns,
                                storageKey, myVcs.getProject());
      myDualView.switchToTheFlatMode();
    }
    new TableSpeedSearch(myDualView.getFlatView()).setComparator(new SpeedSearchComparator(false));
    final TableLinkMouseListener listener = new TableLinkMouseListener();
    listener.installOn(myDualView.getFlatView());
    listener.installOn(myDualView.getTreeView());

    createDualView();
    if (isStaticEmbedded) {
      setIsStaticAndEmbedded(isStaticEmbedded);
    }

    myPopupActions = createPopupActions();

    myHistoryPanelRefresh = new AsynchConsumer<VcsHistorySession>() {
      public void finished() {
        if (treeHistoryProvider != null) {
          // scroll tree view to most recent change
          final TreeTableView treeView = myDualView.getTreeView();
          final int lastRow = treeView.getRowCount() - 1;
          if (lastRow >= 0) {
            treeView.scrollRectToVisible(treeView.getCellRect(lastRow, 0, true));
          }
        }
        myInRefresh = false;
        myTargetSelection = null;

        mySplitter.revalidate();
        mySplitter.repaint();
      }
      public void consume(VcsHistorySession vcsHistorySession) {
        FileHistoryPanelImpl.this.refresh(vcsHistorySession);
      }
    };

    // todo react to event?
    myUpdateAlarm.addRequest(new Runnable() {
      public void run() {
        if (myVcs.getProject().isDisposed()) {
          return;
        }
        boolean refresh = ApplicationManager.getApplication().isActive()
          && !myInRefresh
          && myHistorySession.shouldBeRefreshed();

        myUpdateAlarm.cancelAllRequests();
        if (myUpdateAlarm.isDisposed()) return;
        myUpdateAlarm.addRequest(this, 20000);

        if (refresh) {
          refreshImpl(true);
        }
      }
    }, 20000);

    init();

    chooseView();
  }

  private void replaceTransferable() {
    final TransferHandler originalTransferHandler = myComments.getTransferHandler();

    final TransferHandler newHandler = new TransferHandler("copy") {
      @Override
      public void exportAsDrag(final JComponent comp, final InputEvent e, final int action) {
        originalTransferHandler.exportAsDrag(comp, e, action);
      }

      @Override
      public void exportToClipboard(final JComponent comp, final Clipboard clip, final int action) throws IllegalStateException {
        if ((action == COPY || action == MOVE)
                && (getSourceActions(comp) & action) != 0) {

          String selectedText = myComments.getSelectedText();
          final Transferable t;
          if (selectedText == null) {
            t = new TextTransferable(myComments.getText(), myOriginalComment);
          }
          else {
            t = new TextTransferable(selectedText);
          }
          try {
            clip.setContents(t, null);
            exportDone(comp, t, action);
            return;
          }
          catch (IllegalStateException ise) {
            exportDone(comp, t, NONE);
            throw ise;
          }
        }

        exportDone(comp, null, NONE);
      }

      @Override
      public boolean importData(final JComponent comp, final Transferable t) {
        return originalTransferHandler.importData(comp, t);
      }

      @Override
      public boolean canImport(final JComponent comp, final DataFlavor[] transferFlavors) {
        return originalTransferHandler.canImport(comp, transferFlavors);
      }

      @Override
      public int getSourceActions(final JComponent c) {
        return originalTransferHandler.getSourceActions(c);
      }

      @Override
      public Icon getVisualRepresentation(final Transferable t) {
        return originalTransferHandler.getVisualRepresentation(t);
      }
    };

    myComments.setTransferHandler(newHandler);
  }

  private DualViewColumnInfo[] createColumnList(Project project, VcsHistoryProvider provider, final VcsHistorySession session) {
    final VcsDependentHistoryComponents components = provider.getUICustomization(session, this);
    myAdditionalDetails = components.getDetailsComponent();
    myListener = components.getRevisionListener();

    ArrayList<DualViewColumnInfo> columns = new ArrayList<DualViewColumnInfo>();
    if (provider.isDateOmittable()) {
      columns.addAll(Arrays.asList(REVISION, AUTHOR));
    }
    else {
      columns.addAll(Arrays.asList(REVISION, DATE, AUTHOR));
    }

    columns.addAll(wrapAdditionalColumns(components.getColumns()));
    columns.add(new MessageColumnInfo(project));
    return columns.toArray(new DualViewColumnInfo[columns.size()]);
  }

  private Collection<DualViewColumnInfo> wrapAdditionalColumns(ColumnInfo[] additionalColumns) {
    ArrayList<DualViewColumnInfo> result = new ArrayList<DualViewColumnInfo>();
    if (additionalColumns != null) {
      for (ColumnInfo additionalColumn : additionalColumns) {
        result.add(new MyColumnWrapper(additionalColumn));
      }
    }
    return result;
  }

  private static List<TreeItem<VcsFileRevision>> wrapWithTreeElements(List<VcsFileRevision> revisions) {
    ArrayList<TreeItem<VcsFileRevision>> result = new ArrayList<TreeItem<VcsFileRevision>>();
    for (final VcsFileRevision revision : revisions) {
      result.add(new TreeItem<VcsFileRevision>(revision));
    }
    return result;
  }

  private void refresh(final VcsHistorySession session) {
    myHistorySession = session;
    refreshRevisionsOrder();
    HistoryAsTreeProvider treeHistoryProvider = session.getHistoryAsTreeProvider();

    if (myHistorySession.getRevisionList().isEmpty()) {
      adjustEmptyText();
    }

    if (treeHistoryProvider != null) {
      myDualView.setRoot(new TreeNodeOnVcsRevision(null,
        treeHistoryProvider.createTreeOn(myHistorySession.getRevisionList())), myTargetSelection);
    }
    else {
      myDualView.setRoot(new TreeNodeOnVcsRevision(null,
        wrapWithTreeElements(myHistorySession.getRevisionList())), myTargetSelection);
    }

    columnSizesOnce();
    myDualView.expandAll();
    myDualView.repaint();
  }

  private void columnSizesOnce() {
    if (! myColumnSizesSet) {
      myDualView.getFlatView().updateColumnSizes();
      myColumnSizesSet = true;
    }
  }

  private void adjustEmptyText() {
    VirtualFile virtualFile = myFilePath.getVirtualFile();
    if (virtualFile == null || !virtualFile.isValid()) {
      if (!myFilePath.getIOFile().exists()) {
        String emptyText = "File " + myFilePath.getName() + " not found";
        setEmptyText(emptyText);
        return;
      }
    }
    setEmptyText(StatusText.DEFAULT_EMPTY_TEXT);
  }

  private void setEmptyText(String emptyText) {
    myDualView.getFlatView().getEmptyText().setText(emptyText);
    myDualView.getTreeView().getEmptyText().setText(emptyText);
  }

  protected void addActionsTo(DefaultActionGroup group) {
    addToGroup(false, group);
  }

  private void createDualView() {
    myDualView.setShowGrid(true);
    myDualView.getTreeView().addMouseListener(new PopupHandler() {
      public void invokePopup(Component comp, int x, int y) {
        ActionPopupMenu popupMenu = ActionManager.getInstance()
          .createActionPopupMenu(ActionPlaces.UPDATE_POPUP, myPopupActions);
        popupMenu.getComponent().show(comp, x, y);
      }
    });

    myDualView.getFlatView().addMouseListener(new PopupHandler() {
      public void invokePopup(Component comp, int x, int y) {
        ActionPopupMenu popupMenu = ActionManager.getInstance()
          .createActionPopupMenu(ActionPlaces.UPDATE_POPUP, myPopupActions);
        popupMenu.getComponent().show(comp, x, y);
      }
    });

    myDualView.requestFocus();

    myDualView.addListSelectionListener(new ListSelectionListener() {
      public void valueChanged(ListSelectionEvent e) {
        updateMessage();
      }
    });

    myDualView.setRootVisible(false);

    myDualView.expandAll();

    final TreeCellRenderer defaultCellRenderer = myDualView.getTree().getCellRenderer();

    final Getter<VcsHistorySession> sessionGetter = new Getter<VcsHistorySession>() {
      public VcsHistorySession get() {
        return myHistorySession;
      }
    };
    myDualView.setTreeCellRenderer(new MyTreeCellRenderer(defaultCellRenderer, sessionGetter));

    myDualView.setCellWrapper(new MyCellWrapper(sessionGetter));

    final TableView flatView = myDualView.getFlatView();
    TableViewModel sortableModel = flatView.getTableViewModel();
    sortableModel.setSortable(true);

    final RowSorter<? extends TableModel> rowSorter = flatView.getRowSorter();
    if (rowSorter != null) {
      rowSorter.setSortKeys(Arrays.asList(new RowSorter.SortKey(0, SortOrder.DESCENDING)));
    }
  }

  private static void makeBold(Component component) {
    if (component instanceof JComponent) {
      JComponent jComponent = (JComponent)component;
      Font font = jComponent.getFont();
      if (font != null) {
        jComponent.setFont(font.deriveFont(Font.BOLD));
      }
    }
    else if (component instanceof Container) {
      Container container = (Container)component;
      for (int i = 0; i < container.getComponentCount(); i++) {
        makeBold(container.getComponent(i));
      }
    }

  }

  private void updateMessage() {
    List selection = getSelection();
    final VcsFileRevision revision;
    if (selection.size() != 1) {
      revision = null;
      myComments.setText("");
      myOriginalComment = "";
    }
    else {
      revision = getFirstSelectedRevision();
      if (revision != null) {
        final String message = revision.getCommitMessage();
        myOriginalComment = message;
        @NonNls final String text = IssueLinkHtmlRenderer.formatTextIntoHtml(myVcs.getProject(), message);
        myComments.setText(text);
        myComments.setCaretPosition(0);
      }
    }
    if (myListener != null) {
      myListener.consume(revision);
    }
  }


  protected JComponent createCenterPanel() {
    mySplitter = new Splitter(true, getSplitterProportion());
    mySplitter.setDividerWidth(4);
    //splitter.getDivider().setBackground(UIUtil.getBgFillColor(splitter.getDivider()).brighter());

    mySplitter.addPropertyChangeListener(new PropertyChangeListener() {
      public void propertyChange(PropertyChangeEvent evt) {
        if (Splitter.PROP_PROPORTION.equals(evt.getPropertyName())) {
          setSplitterProportionTo((Float)evt.getNewValue());
        }
      }
    });

    JPanel commentGroup = new JPanel(new BorderLayout());
    final JLabel commentLabel = new JLabel(COMMIT_MESSAGE_TITLE + ":");
    commentGroup.add(commentLabel, BorderLayout.NORTH);
    JScrollPane pane = ScrollPaneFactory.createScrollPane(myComments);
    pane.setBorder(IdeBorderFactory.createBorder(SideBorder.TOP | SideBorder.LEFT | (myAdditionalDetails == null ? 0 : SideBorder.RIGHT)));

    commentGroup.add(pane, BorderLayout.CENTER);
    myDetailsSplitter.setFirstComponent(commentGroup);
    myDetailsSplitter.setSecondComponent(myAdditionalDetails);

    mySplitter.setFirstComponent(myDualView);
    setupDetails();
    return mySplitter;
  }

  private void setupDetails() {
    boolean showDetails = ! myIsStaticAndEmbedded && getConfiguration().SHOW_FILE_HISTORY_DETAILS;
    if (showDetails) {
      myDualView.setViewBorder(IdeBorderFactory.createBorder(SideBorder.LEFT | SideBorder.BOTTOM));
    }
    else {
      myDualView.setViewBorder(IdeBorderFactory.createBorder(SideBorder.LEFT));
    }
    
    mySplitter.setSecondComponent(showDetails ? myDetailsSplitter : null);
  }

  private void chooseView() {
    if (showTree()) {
      myDualView.switchToTheTreeMode();
    }
    else {
      myDualView.switchToTheFlatMode();
    }
  }

  private boolean showTree() {
    return getConfiguration().SHOW_FILE_HISTORY_AS_TREE;
  }

  private void setSplitterProportionTo(Float newProportion) {
    getConfiguration().FILE_HISTORY_SPLITTER_PROPORTION = newProportion.floatValue();
  }

  protected float getSplitterProportion() {
    return getConfiguration().FILE_HISTORY_SPLITTER_PROPORTION;
  }

  private VcsConfiguration getConfiguration() {
    return VcsConfiguration.getInstance(myVcs.getProject());
  }

  private DefaultActionGroup createPopupActions() {
    return addToGroup(true, new DefaultActionGroup(null, false));

  }

  private DefaultActionGroup addToGroup(boolean popup, DefaultActionGroup result) {
    if (popup) {
      result.add(ActionManager.getInstance().getAction(IdeActions.ACTION_EDIT_SOURCE));
    }

    final MyDiffAction diffAction = new MyDiffAction();
    result.add(diffAction);
    if (!popup) {
      diffAction.registerCustomShortcutSet(new CustomShortcutSet(
        CommonShortcuts.getDiff().getShortcuts() [0],
        CommonShortcuts.DOUBLE_CLICK_1.getShortcuts() [0]), myDualView.getFlatView());
      diffAction.registerCustomShortcutSet(new CustomShortcutSet(
        CommonShortcuts.getDiff().getShortcuts() [0],
        CommonShortcuts.DOUBLE_CLICK_1.getShortcuts() [0]), myDualView.getTreeView());
    }
    else {
      diffAction.registerCustomShortcutSet(CommonShortcuts.getDiff(), this);
    }
    final MyShowDiffWithLocalAction showDiffWithLocalAction = new MyShowDiffWithLocalAction();
    result.add(showDiffWithLocalAction);

    final AnAction diffGroup = ActionManager.getInstance().getAction(VCS_HISTORY_ACTIONS_GROUP);
    if (diffGroup != null) result.add(diffGroup);    
    result.add(new MyCreatePatch());
    result.add(new MyGetVersionAction());
    result.add(new MyAnnotateAction());
    AnAction[] additionalActions = myProvider.getAdditionalActions(new Runnable() {
      public void run() {
        refreshImpl(true);
      }
    });
    if (additionalActions != null) {
      for (AnAction additionalAction : additionalActions) {
        if (popup || additionalAction.getTemplatePresentation().getIcon() != null) {
          result.add(additionalAction);
        }
      }
    }
    result.add(new RefreshFileHistoryAction());
    if (! myIsStaticAndEmbedded) {
      result.add(new MyToggleAction());
    }

    if (!popup && supportsTree()) {
      result.add(new MyShowAsTreeAction());
    }

    return result;
  }

  private void refreshImpl(final boolean useLastRevision) {
    new AbstractCalledLater(myVcs.getProject(), ModalityState.NON_MODAL) {
      public void run() {
        if (myInRefresh) return;
        myInRefresh = true;
        myTargetSelection = myDualView.getFlatView().getSelectedObjects();

        mySplitter.revalidate();
        mySplitter.repaint();

        myRefresherI.run(true, useLastRevision);
        columnSizesOnce();
      }
    }.callMe();
  }

  public AsynchConsumer<VcsHistorySession> getHistoryPanelRefresh() {
    return myHistoryPanelRefresh;
  }

  private boolean supportsTree() {
    return myHistorySession != null && myHistorySession.getHistoryAsTreeProvider() != null;
  }

  private class MyShowAsTreeAction extends ToggleAction implements DumbAware {
    public MyShowAsTreeAction() {
      super(VcsBundle.message("action.name.show.files.as.tree"), null, PlatformIcons.SMALL_VCS_CONFIGURABLE);
    }

    public boolean isSelected(AnActionEvent e) {
      return getConfiguration().SHOW_FILE_HISTORY_AS_TREE;
    }

    public void setSelected(AnActionEvent e, boolean state) {
      getConfiguration().SHOW_FILE_HISTORY_AS_TREE = state;
      chooseView();
    }
  }

  private class MyDiffAction extends AbstractActionForSomeSelection {
    public MyDiffAction() {
      super(VcsBundle.message("action.name.compare"), VcsBundle.message("action.description.compare"), "diff", 2,
            FileHistoryPanelImpl.this);
    }

    protected void executeAction(AnActionEvent e) {
      List<TreeNodeOnVcsRevision> sel = getSelection();

      int selectionSize = sel.size();
      if (selectionSize > 1) {
        myDiffHandler.showDiffForTwo(myFilePath, sel.get(0).getRevision(), sel.get(sel.size() - 1).getRevision());
      }
      else if (selectionSize == 1) {
        final TableView<TreeNodeOnVcsRevision> flatView = myDualView.getFlatView();
        final int selectedRow = flatView.getSelectedRow();
        VcsFileRevision revision = getFirstSelectedRevision();

        VcsFileRevision previousRevision;
        if (selectedRow == (flatView.getRowCount() - 1)) {
          // no previous
          previousRevision = myBottomRevisionForShowDiff != null ? myBottomRevisionForShowDiff : VcsFileRevision.NULL;
        } else {
          previousRevision = flatView.getRow(selectedRow + 1).getRevision();
        }

        if (revision != null) {
          myDiffHandler.showDiffForOne(e, myFilePath, previousRevision, revision);
        }
      }
    }

    public void update(final AnActionEvent e) {
      super.update(e);
      final int selectionSize = getSelection().size();
      e.getPresentation().setEnabled(selectionSize > 0 && isEnabled());
    }

    public boolean isEnabled() {
      final int selectionSize = getSelection().size();
      if (selectionSize == 1) {
        List<TreeNodeOnVcsRevision> sel = getSelection();
        return myHistorySession.isContentAvailable(sel.get(0));
      }
      else if (selectionSize > 1) {
        return isDiffEnabled();
      }
      return false;
    }

    private boolean isDiffEnabled() {
      List<TreeNodeOnVcsRevision> sel = getSelection();
      return myHistorySession.isContentAvailable(sel.get(0)) && myHistorySession.isContentAvailable(sel.get(sel.size() - 1));
    }
  }

  private class MyShowDiffWithLocalAction extends AbstractActionForSomeSelection {
    private MyShowDiffWithLocalAction() {
      super(VcsBundle.message("action.name.compare.with.local"), VcsBundle.message("action.description.compare.with.local"), "diffWithCurrent", 1,
                  FileHistoryPanelImpl.this);
    }

    @Override
    protected void executeAction(AnActionEvent e) {
      final List<TreeNodeOnVcsRevision> selection = getSelection();
      if (selection.size() != 1) return;
      if (ChangeListManager.getInstance(myVcs.getProject()).isFreezedWithNotification(null)) return;
      final VcsRevisionNumber currentRevisionNumber = myHistorySession.getCurrentRevisionNumber();
      VcsFileRevision selectedRevision = getFirstSelectedRevision();
      if (currentRevisionNumber != null && selectedRevision != null) {
        myDiffHandler.showDiffForTwo(myFilePath, selectedRevision, new CurrentRevision(myFilePath.getVirtualFile(), currentRevisionNumber));
      }
    }

    private boolean isDiffWithCurrentEnabled() {
      if (myHistorySession.getCurrentRevisionNumber() == null) return false;
      if (myFilePath.getVirtualFile() == null) return false;
      if (!myHistorySession.isContentAvailable(getFirstSelectedRevision())) return false;
      return true;
    }

    @Override
    public boolean isEnabled() {
      final int size = getSelection().size();
      return size == 1 && isDiffWithCurrentEnabled();
    }
  }

  private class MyGetVersionAction extends AbstractActionForSomeSelection {
    public MyGetVersionAction() {
      super(VcsBundle.message("action.name.get.file.content.from.repository"),
            VcsBundle.message("action.description.get.file.content.from.repository"), "get", 1, FileHistoryPanelImpl.this);
    }

    @Override
    public boolean isEnabled() {
      return super.isEnabled() && getVirtualParent() != null &&
             myHistorySession.isContentAvailable(getFirstSelectedRevision()) && !myFilePath.isDirectory();
    }

    protected void executeAction(AnActionEvent e) {
      if (ChangeListManager.getInstance(myVcs.getProject()).isFreezedWithNotification(null)) return;
      final VcsFileRevision revision = getFirstSelectedRevision();
      if (getVirtualFile() != null) {
        if (!new ReplaceFileConfirmationDialog(myVcs.getProject(), VcsBundle.message("acton.name.get.revision"))
          .confirmFor(new VirtualFile[]{getVirtualFile()})) {
          return;
        }
      }

      getVersion(revision);
      refreshFile(revision);
    }

    private void refreshFile(VcsFileRevision revision) {
      Runnable refresh = null;
      final VirtualFile vf = getVirtualFile();
      if (vf == null) {
        final LocalHistoryAction action = startLocalHistoryAction(revision);
        final VirtualFile vp = getVirtualParent();
        if (vp != null) {
          refresh = new Runnable() {
            public void run() {
              vp.refresh(false, true, new Runnable() {
                public void run() {
                  myFilePath.refresh();
                  action.finish();
                }
              });
            }
          };
        }
      } else {
        refresh = new Runnable() {
          public void run() {
            vf.refresh(false, false);
          }
        };
      }
      if (refresh != null) {
        ProgressManager.getInstance().runProcessWithProgressSynchronously(refresh, "Refreshing files...", false, myVcs.getProject());
      }
    }

    private void getVersion(final VcsFileRevision revision) {
      final VirtualFile file = getVirtualFile();
      final Project project = myVcs.getProject();

      new Task.Backgroundable(project, VcsBundle.message("show.diff.progress.title")) {
        @Override
        public void run(@NotNull ProgressIndicator indicator) {
          final LocalHistoryAction action = file != null ? startLocalHistoryAction(revision) : LocalHistoryAction.NULL;
          final byte[] revisionContent;
          try {
            revisionContent = VcsHistoryUtil.loadRevisionContent(revision);
          } catch (final IOException e) {
            LOG.info(e);
            ApplicationManager.getApplication().invokeLater(new Runnable() {
              @Override public void run() {
                Messages.showMessageDialog(VcsBundle.message("message.text.cannot.load.revision", e.getLocalizedMessage()),
                                           VcsBundle.message("message.title.get.revision.content"), Messages.getInformationIcon());
              }
            });
            return;
          } catch (final VcsException e) {
            LOG.info(e);
            ApplicationManager.getApplication().invokeLater(new Runnable() {
              @Override public void run() {
                Messages.showMessageDialog(VcsBundle.message("message.text.cannot.load.revision", e.getLocalizedMessage()),
                                           VcsBundle.message("message.title.get.revision.content"), Messages.getInformationIcon());
              }
            });
            return;
          } catch (ProcessCanceledException ex) {
            return;
          }

          ApplicationManager.getApplication().invokeLater(new Runnable() {
            @Override
            public void run() {
              try {
                new WriteCommandAction.Simple(project) {
                  @Override
                  protected void run() throws Throwable {
                    if (file != null &&
                        !file.isWritable() &&
                        ReadonlyStatusHandler.getInstance(project).ensureFilesWritable(file).hasReadonlyFiles()) {
                      return;
                    }

                    try {
                      write(revisionContent);
                    }
                    catch (IOException e) {
                      Messages.showMessageDialog(VcsBundle.message("message.text.cannot.save.content", e.getLocalizedMessage()),
                                                 VcsBundle.message("message.title.get.revision.content"), Messages.getErrorIcon());
                    }
                  }
                }.execute();
                if (file != null) {
                  VcsDirtyScopeManager.getInstance(project).fileDirty(file);
                }
              }
              finally {
                action.finish();
              }
            }
          });
        }
      }.queue();
    }

    private LocalHistoryAction startLocalHistoryAction(final VcsFileRevision revision) {
      return LocalHistory.getInstance().startAction(createGetActionTitle(revision));
    }

    private String createGetActionTitle(final VcsFileRevision revision) {
      return VcsBundle.message("action.name.for.file.get.version", getIOFile().getAbsolutePath(), revision.getRevisionNumber());
    }

    private File getIOFile() {
      return myFilePath.getIOFile();
    }

    private void write(byte[] revision) throws IOException {
      if (getVirtualFile() == null) {
        writeContentToIOFile(revision);
      }
      else {
        Document document = myFilePath.getDocument();
        if (document == null) {
          writeContentToFile(revision);
        }
        else {
          writeContentToDocument(document, revision);
        }
      }
    }

    private void writeContentToIOFile(byte[] revisionContent) throws IOException {
      FileOutputStream outputStream = new FileOutputStream(getIOFile());
      try {
        outputStream.write(revisionContent);
      }
      finally {
        outputStream.close();
      }
    }

    private void writeContentToFile(final byte[] revision) throws IOException {
      getVirtualFile().setBinaryContent(revision);
    }

    private void writeContentToDocument(final Document document, byte[] revisionContent) throws IOException {
      final String content = StringUtil.convertLineSeparators(new String(revisionContent, myFilePath.getCharset().name()));

      CommandProcessor.getInstance().executeCommand(myVcs.getProject(), new Runnable() {
        public void run() {
          document.replaceString(0, document.getTextLength(), content);
        }
      }, VcsBundle.message("message.title.get.version"), null);
    }

  }

  private class MyAnnotateAction extends AnAction implements DumbAware {
    public MyAnnotateAction() {
      super(VcsBundle.message("annotate.action.name"), VcsBundle.message("annotate.action.description"),
            AllIcons.Actions.Annotate);
    }

    private String key(final VirtualFile vf) {
      return vf.getPath();
    }

    public void update(AnActionEvent e) {
      VirtualFile revVFile = e.getData( VcsDataKeys.VCS_VIRTUAL_FILE );
      VcsFileRevision revision = e.getData( VcsDataKeys.VCS_FILE_REVISION );
      final Boolean nonLocal = e.getData(VcsDataKeys.VCS_NON_LOCAL_HISTORY_SESSION);

      boolean isFile = revVFile != null && !revVFile.isDirectory();
      FileType fileType = isFile ? revVFile.getFileType() : null;
      boolean enabled = revision != null && isFile && !fileType.isBinary() && !Boolean.TRUE.equals(nonLocal);

      if (enabled) {
        final ProjectLevelVcsManager plVcsManager = ProjectLevelVcsManager.getInstance(myVcs.getProject());
        enabled = (! (((ProjectLevelVcsManagerImpl) plVcsManager).getBackgroundableActionHandler(
          VcsBackgroundableActions.ANNOTATE).isInProgress(key(revVFile))));
      }

      e.getPresentation()
        .setEnabled(enabled &&
                    myHistorySession.isContentAvailable(revision) &&
                    myAnnotationProvider != null && myAnnotationProvider.isAnnotationValid(revision));
    }


    public void actionPerformed(AnActionEvent e) {
      final VcsFileRevision revision = e.getData(VcsDataKeys.VCS_FILE_REVISION);
      final VirtualFile revisionVirtualFile = e.getData(VcsDataKeys.VCS_VIRTUAL_FILE);
      final Boolean nonLocal = e.getData(VcsDataKeys.VCS_NON_LOCAL_HISTORY_SESSION);

      if ((revision == null) || (revisionVirtualFile == null) || Boolean.TRUE.equals(nonLocal)) return;

      final BackgroundableActionEnabledHandler handler = ((ProjectLevelVcsManagerImpl) ProjectLevelVcsManager.getInstance(myVcs.getProject())).
        getBackgroundableActionHandler(VcsBackgroundableActions.ANNOTATE);
      handler.register(key(revisionVirtualFile));

      final Ref<FileAnnotation> fileAnnotationRef = new Ref<FileAnnotation>();
      final Ref<VcsException> exceptionRef = new Ref<VcsException>();

      ProgressManager.getInstance().run(new Task.Backgroundable(myVcs.getProject(), VcsBundle.message("retrieving.annotations"), true,
          BackgroundFromStartOption.getInstance()) {
        public void run(@NotNull ProgressIndicator indicator) {
          try {
            fileAnnotationRef.set(myAnnotationProvider.annotate(revisionVirtualFile, revision));
          }
          catch (VcsException e) {
            exceptionRef.set(e);
          }
        }

        @Override
        public void onCancel() {
          onSuccess();
        }

        @Override
        public void onSuccess() {
          handler.completed(key(revisionVirtualFile));

          if (! exceptionRef.isNull()) {
            AbstractVcsHelper.getInstance(myProject).showError(exceptionRef.get(), VcsBundle.message("operation.name.annotate"));
          }
          if (fileAnnotationRef.isNull()) return;

          AbstractVcsHelper.getInstance(myProject).showAnnotation(fileAnnotationRef.get(), revisionVirtualFile, myVcs);
        }
      });
    }
  }

  public Object getData(String dataId) {
    VcsFileRevision firstSelectedRevision = getFirstSelectedRevision();
    if (CommonDataKeys.NAVIGATABLE.is(dataId)) {
      List selectedItems = getSelection();
      if (selectedItems.size() != 1) return null;
      if (!myHistorySession.isContentAvailable(firstSelectedRevision)) {
        return null;
      }
      VirtualFile virtualFileForRevision = createVirtualFileForRevision(firstSelectedRevision);
      if (virtualFileForRevision != null) {
        return new OpenFileDescriptor(myVcs.getProject(), virtualFileForRevision);
      }
      else {
        return null;
      }
    }
    else if (CommonDataKeys.PROJECT.is(dataId)) {
      return myVcs.getProject();
    }
    else if (VcsDataKeys.VCS_FILE_REVISION.is(dataId)) {
      return firstSelectedRevision;
    } else if (VcsDataKeys.VCS_NON_LOCAL_HISTORY_SESSION.is(dataId) && myHistorySession != null) {
      return ! myHistorySession.hasLocalSource();
    } else if (VcsDataKeys.VCS.is(dataId)) {
      return myVcs.getKeyInstanceMethod();
    }
    else if (VcsDataKeys.VCS_FILE_REVISIONS.is(dataId)) {
      return getSelectedRevisions();
    } else if (VcsDataKeys.REMOTE_HISTORY_CHANGED_LISTENER.is(dataId)) {
      return new Consumer<String>() {
        @Override
        public void consume(String s) {
          myDualView.rebuild();
        }
      };
    } else if (VcsDataKeys.CHANGES.is(dataId)) {
      return getChanges();
    }
    else if (VcsDataKeys.VCS_VIRTUAL_FILE.is(dataId)) {
      if (firstSelectedRevision == null) return null;
      return createVirtualFileForRevision(firstSelectedRevision);
    }
    else if (VcsDataKeys.FILE_PATH.is(dataId)) {
      return myFilePath;
    }
    else if (VcsDataKeys.IO_FILE.is(dataId)) {
      return myFilePath.getIOFile();
    }
    else if (CommonDataKeys.VIRTUAL_FILE.is(dataId)) {
      if (getVirtualFile() == null) return null;
      if (getVirtualFile().isValid()) {
        return getVirtualFile();
      }
      else {
        return null;
      }
    }
    else if (VcsDataKeys.FILE_HISTORY_PANEL.is(dataId)) {
      return this;
    }
    else {
      return super.getData(dataId);
    }
  }

  @Nullable
  private Change[] getChanges() {
    final VcsFileRevision[] revisions = getSelectedRevisions();

    if (revisions.length > 0) {
      Arrays.sort(revisions, new Comparator<VcsFileRevision>() {
        public int compare(final VcsFileRevision o1, final VcsFileRevision o2) {
          return o1.getRevisionNumber().compareTo(o2.getRevisionNumber());
        }
      });

      for (VcsFileRevision revision : revisions) {
        if (! myHistorySession.isContentAvailable(revision)) {
          return null;
        }
      }

      final ContentRevision startRevision = new LoadedContentRevision(myFilePath, revisions[0], myVcs.getProject());
      final ContentRevision endRevision = (revisions.length == 1) ? new CurrentContentRevision(myFilePath) :
                                          new LoadedContentRevision(myFilePath, revisions[revisions.length - 1], myVcs.getProject());

      return new Change[]{new Change(startRevision, endRevision)};
    }
    return null;
  }

  private static class LoadedContentRevision implements ContentRevision {
    private final FilePath myFile;
    private final VcsFileRevision myRevision;
    private final Project myProject;

    private LoadedContentRevision(final FilePath file, final VcsFileRevision revision, final Project project) {
      myFile = file;
      myRevision = revision;
      myProject = project;
    }

    public String getContent() throws VcsException {
      try {
        return VcsHistoryUtil.loadRevisionContentGuessEncoding(myRevision, myFile.getVirtualFile(), myProject);
      }
      catch (IOException e) {
        throw new VcsException(VcsBundle.message("message.text.cannot.load.revision", e.getLocalizedMessage()));
      }
    }

    @NotNull
    public FilePath getFile() {
      return myFile;
    }

    @NotNull
    public VcsRevisionNumber getRevisionNumber() {
      return myRevision.getRevisionNumber();
    }
  }

  private VirtualFile createVirtualFileForRevision(VcsFileRevision revision) {
    if (!myRevisionToVirtualFile.containsKey(revision)) {
      FilePath filePath = (revision instanceof VcsFileRevisionEx ? ((VcsFileRevisionEx)revision).getPath() : myFilePath);
      myRevisionToVirtualFile.put(revision, filePath.isDirectory()
                                            ? new VcsVirtualFolder(filePath.getPath(), null, VcsFileSystem.getInstance())
                                            : new VcsVirtualFile(filePath.getPath(), revision, VcsFileSystem.getInstance()));
    }
    return myRevisionToVirtualFile.get(revision);
  }

  private List<TreeNodeOnVcsRevision> getSelection() {
    //noinspection unchecked
    return myDualView.getSelection();
  }

  @Nullable
  private VcsFileRevision getFirstSelectedRevision() {
    List selection = getSelection();
    if (selection.isEmpty()) return null;
    return ((TreeNodeOnVcsRevision)selection.get(0)).myRevision;
  }

  public VcsFileRevision[] getSelectedRevisions() {
    List<TreeNodeOnVcsRevision> selection = getSelection();
    VcsFileRevision[] result = new VcsFileRevision[selection.size()];
    for(int i=0; i<selection.size(); i++) {
      result [i] = selection.get(i).myRevision;
    }
    return result;
  }

  static class TreeNodeOnVcsRevision extends DefaultMutableTreeNode implements VcsFileRevision, DualTreeElement {
    private final VcsFileRevision myRevision;

    public TreeNodeOnVcsRevision(VcsFileRevision revision, List<TreeItem<VcsFileRevision>> roots) {
      myRevision = revision == null ? VcsFileRevision.NULL : revision;
      for (final TreeItem<VcsFileRevision> root : roots) {
        add(new TreeNodeOnVcsRevision(root.getData(), root.getChildren()));
      }
    }

    @Nullable
    @Override
    public RepositoryLocation getChangedRepositoryPath() {
      return myRevision.getChangedRepositoryPath();
    }

    public VcsFileRevision getRevision() {
      return myRevision;
    }

    public String getAuthor() {
      return myRevision.getAuthor();
    }

    public String getCommitMessage() {
      return myRevision.getCommitMessage();
    }

    public byte[] loadContent() throws IOException, VcsException {
      return myRevision.loadContent();
    }

    public VcsRevisionNumber getRevisionNumber() {
      return myRevision.getRevisionNumber();
    }

    public Date getRevisionDate() {
      return myRevision.getRevisionDate();
    }

    public String getBranchName() {
      return myRevision.getBranchName();
    }

    public byte[] getContent() throws IOException, VcsException {
      return myRevision.getContent();
    }

    public String toString() {
      return getRevisionNumber().asString();
    }

    public boolean shouldBeInTheFlatView() {
      return myRevision != VcsFileRevision.NULL;
    }

    @Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;

      TreeNodeOnVcsRevision that = (TreeNodeOnVcsRevision)o;

      if (myRevision != null ? !myRevision.getRevisionNumber().equals(that.myRevision.getRevisionNumber()) : that.myRevision != null) return false;

      return true;
    }

    @Override
    public int hashCode() {
      return myRevision != null ? myRevision.getRevisionNumber().hashCode() : 0;
    }
  }

  public void dispose() {
    super.dispose();
    myDualView.dispose();
    myUpdateAlarm.dispose();
  }

  abstract class AbstractActionForSomeSelection extends AnAction implements DumbAware {
    private final int mySuitableSelectedElements;
    private final FileHistoryPanelImpl mySelectionProvider;

    public AbstractActionForSomeSelection(String name,
                                          String description,
                                          @NonNls String iconName,
                                          int suitableSelectionSize,
                                          FileHistoryPanelImpl tableProvider) {
      super(name, description, IconLoader.getIcon("/actions/" + iconName + ".png"));
      mySuitableSelectedElements = suitableSelectionSize;
      mySelectionProvider = tableProvider;
    }

    protected abstract void executeAction(AnActionEvent e);

    public boolean isEnabled() {
      return mySelectionProvider.getSelection().size() == mySuitableSelectedElements;
    }

    public void actionPerformed(AnActionEvent e) {
      if (!isEnabled()) return;
      executeAction(e);
    }

    public void update(AnActionEvent e) {
      Presentation presentation = e.getPresentation();
      presentation.setVisible(true);
      presentation.setEnabled(isEnabled());
    }
  }

  abstract static class VcsColumnInfo<T extends Comparable> extends DualViewColumnInfo<VcsFileRevision, String>
    implements Comparator<VcsFileRevision> {
    public VcsColumnInfo(String name) {
      super(name);
    }

    protected abstract T getDataOf(VcsFileRevision o);

    public Comparator<VcsFileRevision> getComparator() {
      return this;
    }

    public String valueOf(VcsFileRevision object) {
      T result = getDataOf(object);
      return result == null ? "" : result.toString();
    }

    public int compare(VcsFileRevision o1, VcsFileRevision o2) {
      return compareObjects(getDataOf(o1), getDataOf(o2));
    }

    private static int compareObjects(Comparable data1, Comparable data2) {
      if (data1 == data2) return 0;
      if (data1 == null) return -1;
      if (data2 == null) return 1;
      return data1.compareTo(data2);
    }

    public boolean shouldBeShownIsTheTree() {
      return true;
    }

    public boolean shouldBeShownIsTheTable() {
      return true;
    }

  }

  private class MyColumnWrapper<T> extends DualViewColumnInfo<TreeNodeOnVcsRevision, Object> {
    private final ColumnInfo<VcsFileRevision, T> myBaseColumn;

    public Comparator<TreeNodeOnVcsRevision> getComparator() {
      final Comparator comparator = myBaseColumn.getComparator();
      if (comparator == null) return null;
      return new Comparator<TreeNodeOnVcsRevision>() {
        public int compare(TreeNodeOnVcsRevision o1, TreeNodeOnVcsRevision o2) {
          if (o1 == null) return -1;
          if (o2 == null) return 1;
          VcsFileRevision revision1 = o1.myRevision;
          VcsFileRevision revision2 = o2.myRevision;
          if (revision1 == null) return -1;
          if (revision2 == null) return 1;
          return comparator.compare(revision1, revision2);
        }
      };
    }

    public String getName() {
      return myBaseColumn.getName();
    }

    public Class getColumnClass() {
      return myBaseColumn.getColumnClass();
    }

    public boolean isCellEditable(TreeNodeOnVcsRevision o) {
      return myBaseColumn.isCellEditable(o.myRevision);
    }

    public void setValue(TreeNodeOnVcsRevision o, Object aValue) {
      //noinspection unchecked
      myBaseColumn.setValue(o.myRevision, (T)aValue);
    }

    public TableCellRenderer getRenderer(TreeNodeOnVcsRevision p0) {
      return myBaseColumn.getRenderer(p0.myRevision);
    }

    public TableCellEditor getEditor(TreeNodeOnVcsRevision item) {
      return myBaseColumn.getEditor(item.myRevision);
    }

    public String getMaxStringValue() {
      final String superValue = myBaseColumn.getMaxStringValue();
      if (superValue != null) return superValue;
      return getMaxValue(myBaseColumn.getName());
    }

    public int getAdditionalWidth() {
      return myBaseColumn.getAdditionalWidth();
    }

    public int getWidth(JTable table) {
      return myBaseColumn.getWidth(table);
    }

    public void setName(String s) {
      myBaseColumn.setName(s);
    }

    public MyColumnWrapper(ColumnInfo<VcsFileRevision, T> additionalColunm) {
      super(additionalColunm.getName());
      myBaseColumn = additionalColunm;
    }

    public boolean shouldBeShownIsTheTree() {
      return true;
    }

    public boolean shouldBeShownIsTheTable() {
      return true;
    }

    public Object valueOf(TreeNodeOnVcsRevision o) {
      return myBaseColumn.valueOf(o.myRevision);
    }
  }

  private VirtualFile getVirtualFile() {
    return myFilePath.getVirtualFile();
  }

  private VirtualFile getVirtualParent() {
    return myFilePath.getVirtualFileParent();
  }

  private String getMaxValue(String name) {
    if (myDualView == null) return null;
    TableView table = myDualView.getFlatView();
    if (table.getRowCount() == 0) return null;
    final Enumeration<TableColumn> columns = table.getColumnModel().getColumns();
    int idx = 0;
    while (columns.hasMoreElements()) {
      TableColumn column = columns.nextElement();
      if (name.equals(column.getHeaderValue())) {
        break;
      }
      ++ idx;
    }
    if (idx >= table.getColumnModel().getColumnCount() - 1) return null;
    final FontMetrics fm = table.getFontMetrics(table.getFont().deriveFont(Font.BOLD));
    final Object header = table.getColumnModel().getColumn(idx).getHeaderValue();
    double maxValue = fm.stringWidth((String)header);
    String value = (String)header;
    for (int i = 0; i < table.getRowCount(); i++) {
      final Object at = table.getValueAt(i, idx);
      if (at instanceof String) {
        final int newWidth = fm.stringWidth((String)at);
        if (newWidth > maxValue) {
          maxValue = newWidth;
          value = (String) at;
        }
      }
    }
    return value + "ww";
  }

  private class MyTreeCellRenderer implements TreeCellRenderer {
    private final TreeCellRenderer myDefaultCellRenderer;
    private final Getter<VcsHistorySession> myHistorySession;

    public MyTreeCellRenderer(final TreeCellRenderer defaultCellRenderer, final Getter<VcsHistorySession> historySession) {
      myDefaultCellRenderer = defaultCellRenderer;
      myHistorySession = historySession;
    }

    public Component getTreeCellRendererComponent(JTree tree,
                                                  Object value,
                                                  boolean selected,
                                                  boolean expanded,
                                                  boolean leaf,
                                                  int row,
                                                  boolean hasFocus) {
      final Component result = myDefaultCellRenderer.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);

      final TreePath path = tree.getPathForRow(row);
      if (path == null) return result;
      final VcsFileRevision revision = row >= 0 ? (VcsFileRevision)path.getLastPathComponent() : null;

      if (revision != null) {
        if (myHistorySession.get().isCurrentRevision(revision.getRevisionNumber())) {
          makeBold(result);
        }
        if (!selected && myHistorySession.get().isCurrentRevision(revision.getRevisionNumber())) {
          result.setBackground(new Color(188, 227, 231));
        }
        ((JComponent)result).setOpaque(false);
      }
      else if (selected) {
        result.setBackground(UIUtil.getTableSelectionBackground());
      }
      else {
        result.setBackground(UIUtil.getTableBackground());
      }

      return result;
    }
  }

  private static class MyCellWrapper implements CellWrapper {
    private final Getter<VcsHistorySession> myHistorySession;

    public MyCellWrapper(final Getter<VcsHistorySession> historySession) {
      myHistorySession = historySession;
    }

    public void wrap(Component component,
                     JTable table,
                     Object value,
                     boolean isSelected,
                     boolean hasFocus,
                     int row,
                     int column,
                     Object treeNode) {
      VcsFileRevision revision = (VcsFileRevision)treeNode;
      if (revision == null) return;
      if (myHistorySession.get().isCurrentRevision(revision.getRevisionNumber())) {
        makeBold(component);
      }
    }
  }

  private class RefreshFileHistoryAction extends AnAction implements DumbAware {
    public RefreshFileHistoryAction() {
      super(VcsBundle.message("action.name.refresh"), VcsBundle.message("action.desctiption.refresh"), AllIcons.Actions.Refresh);
    }

    public void actionPerformed(AnActionEvent e) {
      if (myInRefresh) return;
      refreshImpl(false);
    }

    @Override
    public void update(AnActionEvent e) {
      super.update(e);
      e.getPresentation().setEnabled(! myInRefresh);
    }
  }

  private void refreshRevisionsOrder() {
    final List<VcsFileRevision> list = myHistorySession.getRevisionList();
    myRevisionsOrder.clear();

    int cnt = 0;
    for (VcsFileRevision revision : list) {
      myRevisionsOrder.put(revision.getRevisionNumber(), cnt);
      ++ cnt;
    }
  }

  public void setIsStaticAndEmbedded(boolean isStaticAndEmbedded) {
    myIsStaticAndEmbedded = isStaticAndEmbedded;
    myDualView.setZipByHeight(isStaticAndEmbedded);
    myDualView.getFlatView().updateColumnSizes();
    if (myIsStaticAndEmbedded) {
      disableClose();
      myDualView.getFlatView().getTableHeader().setBorder(IdeBorderFactory.createBorder(SideBorder.TOP));
      myDualView.getTreeView().getTableHeader().setBorder(IdeBorderFactory.createBorder(SideBorder.TOP));
      myDualView.getFlatView().setBorder(null);
      myDualView.getTreeView().setBorder(null);
    }
  }

  public void setBottomRevisionForShowDiff(VcsFileRevision bottomRevisionForShowDiff) {
    myBottomRevisionForShowDiff = bottomRevisionForShowDiff;
  }

  private static class FolderPatchCreationTask extends Task.Backgroundable {
    @Nullable private final AbstractVcs myVcs;
    private final TreeNodeOnVcsRevision myRevision;
    private CommittedChangeList myList;
    private VcsException myException;

    private FolderPatchCreationTask(@Nullable AbstractVcs vcs, final TreeNodeOnVcsRevision revision) {
      super(vcs.getProject(), VcsBundle.message("create.patch.loading.content.progress"), true);
      myVcs = vcs;
      myRevision = revision;
    }

    @Override
    public void run(@NotNull ProgressIndicator indicator) {
      final CommittedChangesProvider provider = myVcs.getCommittedChangesProvider();
      if (provider == null) return;
      final RepositoryLocation changedRepositoryPath = myRevision.getChangedRepositoryPath();
      if (changedRepositoryPath == null) return;
      final VcsVirtualFile vf =
        new VcsVirtualFile(changedRepositoryPath.toPresentableString(), myRevision.getRevision(), VcsFileSystem.getInstance());
      try {
        myList = ShowAllAffectedGenericAction.getRemoteList(myVcs, myRevision.getRevisionNumber(), vf);
        //myList = provider.getOneList(vf, myRevision.getRevisionNumber());
      }
      catch (VcsException e1) {
        myException = e1;
      }
    }

    @Override
    public void onSuccess() {
      final AbstractVcsHelper helper = AbstractVcsHelper.getInstance(myProject);
      if (myException != null) {
        helper.showError(myException, VcsBundle.message("create.patch.error.title", myException.getMessage()));
      } else {
        if (myList == null) {
          helper.showError(myException, "Can not load changelist contents");
          return;
        }
        CreatePatchFromChangesAction.createPatch(myProject, myList.getComment(), new ArrayList<Change>(myList.getChanges()));
      }
    }
  }

  public class MyCreatePatch extends DumbAwareAction {
    private final CreatePatchFromChangesAction myUsualDelegate;

    public MyCreatePatch() {
      super(VcsBundle.message("action.name.create.patch.for.selected.revisions"),
                VcsBundle.message("action.description.create.patch.for.selected.revisions"), AllIcons.Actions.CreatePatch);
      myUsualDelegate = new CreatePatchFromChangesAction();
    }

    @Override
    public void actionPerformed(AnActionEvent e) {
      if (myFilePath.isDirectory()) {
        final List<TreeNodeOnVcsRevision> selection = getSelection();
        if (selection.size() != 1) return;
        ProgressManager.getInstance().run(new FolderPatchCreationTask(myVcs, selection.get(0)));
      } else {
        myUsualDelegate.actionPerformed(e);
      }
    }

    @Override
    public void update(AnActionEvent e) {
      e.getPresentation().setVisible(true);
      if (myFilePath.isNonLocal()) {
        e.getPresentation().setEnabled(false);
        return;
      }
      boolean enabled = (! myFilePath.isDirectory()) || myProvider.supportsHistoryForDirectories();
      final int selectionSize = getSelection().size();
      if (enabled && (! myFilePath.isDirectory())) {
        // in order to do not load changes only for action update
        enabled = (selectionSize > 0) && (selectionSize < 3);
      } else if (enabled) {
        enabled = selectionSize == 1 && getSelection().get(0).getChangedRepositoryPath() != null;
      }
      e.getPresentation().setEnabled(enabled);
    }
  }

  /**
   * @author Kirill Likhodedov
   */
  private class StandardDiffFromHistoryHandler implements DiffFromHistoryHandler {

    @Override
    public void showDiffForOne(@NotNull AnActionEvent e, @NotNull FilePath filePath,
                               @NotNull VcsFileRevision previousRevision, @NotNull VcsFileRevision revision) {
      VcsHistoryUtil.showDifferencesInBackground(myVcs.getProject(), myFilePath, previousRevision, revision, true);
    }

    @Override
    public void showDiffForTwo(@NotNull FilePath filePath, @NotNull VcsFileRevision revision1, @NotNull VcsFileRevision revision2) {
      VcsHistoryUtil.showDifferencesInBackground(myProject, myFilePath, revision1, revision2, true);
    }
  }

  private class MyToggleAction extends ToggleAction implements DumbAware {

    public MyToggleAction() {
      super("Show Details", "Display details panel", AllIcons.Actions.Preview);
    }

    @Override
    public boolean isSelected(AnActionEvent e) {
      return getConfiguration().SHOW_FILE_HISTORY_DETAILS;
    }

    @Override
    public void setSelected(AnActionEvent e, boolean state) {
      getConfiguration().SHOW_FILE_HISTORY_DETAILS = state;
      setupDetails();
    }
  }
}