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Fluent interface for functional GUI testing
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/*
 * Created on Jan 30, 2008
 * 
 * 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.
 * 
 * Copyright @2008-2013 the original author or authors.
 */
package org.assertj.swing.driver;

import static java.lang.Boolean.getBoolean;
import static org.assertj.core.util.Preconditions.checkNotNull;
import static org.assertj.core.util.Strings.concat;
import static org.assertj.swing.core.WindowAncestorFinder.windowAncestorOf;
import static org.assertj.swing.driver.ComponentPreconditions.checkEnabledAndShowing;
import static org.assertj.swing.driver.JMenuPopupMenuQuery.popupMenuOf;
import static org.assertj.swing.driver.WindowMoveToFrontTask.toFront;
import static org.assertj.swing.edt.GuiActionRunner.execute;
import static org.assertj.swing.exception.ActionFailedException.actionFailure;
import static org.assertj.swing.format.Formatting.format;
import static org.assertj.swing.timing.Pause.pause;
import static org.assertj.swing.util.Platform.isOSX;

import java.awt.Component;
import java.awt.Window;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;

import org.assertj.swing.annotation.RunsInEDT;
import org.assertj.swing.core.Robot;
import org.assertj.swing.edt.GuiQuery;
import org.assertj.swing.edt.GuiTask;
import org.assertj.swing.exception.ActionFailedException;
import org.assertj.swing.internal.annotation.InternalApi;

/**
 * 
 * Supports functional testing of {@code JMenuItem}s.
 * 
 * 
 * 
 * Note: This class is intended for internal use only. Please use the classes in the package
 * {@link org.assertj.swing.fixture} in your tests.
 * 
 * 
 * @author Alex Ruiz
 * @author Yvonne Wang
 */
@InternalApi
public class JMenuItemDriver extends JComponentDriver {
  /**
   * Creates a new {@link JMenuItemDriver}.
   * 
   * @param robot the robot to use to simulate user input.
   */
  public JMenuItemDriver(@Nonnull Robot robot) {
    super(robot);
  }

  @Override
  public void click(Component c) {
    /*
     * Since our internal methods now all call click(Component) this is used to route the method calls to the correct
     * method (either the parent method or the click(JMenuItem)).
     */
    if (c instanceof JMenuItem) {
      click((JMenuItem) c);
    } else {
      super.click(c);
    }
  }

  /**
   * Finds and selects the given {@code JMenuItem}.
   * 
   * @param menuItem the {@code JMenuItem} to select.
   * @throws IllegalStateException if the menu to select is disabled.
   * @throws IllegalStateException if the menu to select is not showing on the screen.
   * @throws ActionFailedException if the menu has a pop-up and it fails to show up.
   */
  @RunsInEDT
  public void click(@Nonnull JMenuItem menuItem) {
    show(menuItem);
    doClick(menuItem);
    ensurePopupIsShowing(menuItem);
  }

  @RunsInEDT
  private void show(@Nonnull JMenuItem menuItem) {
    JMenuItemLocation location = locationOf(menuItem);
    activateParentIfIsMenu(location);
    moveParentWindowToFront(location);
    if (menuItem instanceof JMenu && !location.inMenuBar()) {
      waitForSubMenuToShow();
    }
  }

  @RunsInEDT
  private static @Nonnull
  JMenuItemLocation locationOf(final @Nonnull JMenuItem menuItem) {
    JMenuItemLocation result = execute(new GuiQuery() {
      @Override
      protected JMenuItemLocation executeInEDT() {
        return new JMenuItemLocation(menuItem);
      }
    });
    return checkNotNull(result);
  }

  @RunsInEDT
  private void activateParentIfIsMenu(@Nonnull JMenuItemLocation location) {
    if (!location.isParentAMenu()) {
      return;
    }
    Component c = location.parentOrInvoker();
    if (c instanceof JMenuItem) {
      click((JMenuItem) c);
    }
  }

  @RunsInEDT
  private void moveParentWindowToFront(@Nonnull JMenuItemLocation location) {
    if (!location.inMenuBar()) {
      return;
    }
    // TODO windowAncestorOf is not being called in EDT
    moveToFront(windowAncestorOf(location.parentOrInvoker()));
  }

  @RunsInEDT
  private void doClick(@Nonnull JMenuItem menuItem) {
    if (isMacOSMenuBar()) {
      validateAndDoClick(menuItem);
      return;
    }
    super.click(menuItem);
    robot.waitForIdle();
  }

  private boolean isMacOSMenuBar() {
    return isOSX() && (getBoolean("apple.laf.useScreenMenuBar") || getBoolean("com.apple.macos.useScreenMenuBar"));
  }

  @RunsInEDT
  private static void validateAndDoClick(final @Nonnull JMenuItem menuItem) {
    execute(new GuiTask() {
      @Override
      protected void executeInEDT() {
        checkEnabledAndShowing(menuItem);
        menuItem.doClick();
      }
    });
  }

  @RunsInEDT
  private void ensurePopupIsShowing(@Nonnull JMenuItem menuItem) {
    if (!(menuItem instanceof JMenu)) {
      return;
    }
    JPopupMenu popup = popupMenuOf((JMenu) menuItem);
    // TODO review EDT access
    if (!waitForShowing(popup, robot.settings().timeoutToFindPopup())) {
      throw actionFailure(concat("Clicking on menu item <", format(menuItem), "> never showed a pop-up menu"));
    }
    waitForSubMenuToShow();
  }

  private void waitForSubMenuToShow() {
    pause(robot.settings().timeoutToFindSubMenu());
  }

  @RunsInEDT
  private void moveToFront(@Nullable Window w) {
    if (w == null) {
      return;
    }
    // Make sure the window is in front, or its menus may be obscured by another window.
    toFront(w);
    robot.waitForIdle();
    robot.moveMouse(w);
  }
}