/*
 * Copyright 2000-2009 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.wm.impl.status;

import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.ex.EditorEx;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.fileEditor.FileEditorManagerEvent;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.wm.CustomStatusBarWidget;
import com.intellij.openapi.wm.StatusBarWidget;
import com.intellij.ui.UIBundle;
import org.jetbrains.annotations.NotNull;

import javax.swing.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

/**
 * @author cdr
 */
public class InsertOverwritePanel extends EditorBasedWidget implements StatusBarWidget.Multiframe, CustomStatusBarWidget, PropertyChangeListener {
  private final TextPanel myTextPanel = new TextPanel();
  private EditorEx myOldEditor;

  public InsertOverwritePanel(Project project) {
    super(project);
  }

  @NotNull
  public String ID() {
    return "InsertOverwrite";
  }

  public WidgetPresentation getPresentation(@NotNull PlatformType type) {
    return null;
  }

  @Override
  public StatusBarWidget copy() {
    return new InsertOverwritePanel(getProject());
  }

  @Override
  public JComponent getComponent() {
    return myTextPanel;
  }

  private void updateStatus() {
    final Editor editor = getEditor();
    if (editor == null || !editor.isColumnMode()) {
      myTextPanel.setBorder(null);
      myTextPanel.setVisible(false);
    } else {
      myTextPanel.setBorder(WidgetBorder.INSTANCE);
      myTextPanel.setVisible(true);
      myTextPanel.setText(UIBundle.message("status.bar.column.status.text"));
      myTextPanel.setToolTipText("Column selection mode");
    }
  }

  @Override
  public void fileOpened(@NotNull FileEditorManager source, @NotNull VirtualFile file) {
    updateStatus();
    switchEditor();
  }

  @Override
  public void fileClosed(@NotNull FileEditorManager source, @NotNull VirtualFile file) {
    updateStatus();
    switchEditor();
  }

  @Override
  public void propertyChange(PropertyChangeEvent evt) {
    if (EditorEx.PROP_INSERT_MODE.equals(evt.getPropertyName()) || EditorEx.PROP_COLUMN_MODE.equals(evt.getPropertyName())) {
      updateStatus();
    }
  }

  @Override
  public void selectionChanged(@NotNull FileEditorManagerEvent event) {
    updateStatus();
    switchEditor();
  }

  private void switchEditor() {
    if (myOldEditor != null) {
      myOldEditor.removePropertyChangeListener(this);
    }
    EditorEx editor = (EditorEx)getEditor();
    if (editor != null) {
      editor.addPropertyChangeListener(this);
      myOldEditor = editor;
    }
  }
}