/**
 * 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 2012-2015 the original author or authors.
 */
package org.assertj.swing.driver;

import static org.assertj.swing.util.Platform.isOSX;
import static org.assertj.swing.util.Platform.isWindows;
import static org.assertj.swing.util.Platform.isWindowsXP;

import java.awt.Container;
import java.awt.Insets;
import java.awt.Point;

import javax.annotation.Nonnull;

import org.assertj.swing.annotation.RunsInCurrentThread;

/**
 * Utility methods related to window-like containers.
 * 
 * @author Alex Ruiz
 */
final class WindowLikeContainers {
  private static final int MAXIMIZE_BUTTON_OFFSET = isOSX() ? 25 : isWindows() ? -20 : 0;

  /**
   * <p>
   * Identifies the coordinates of the 'close' button.
   * </p>
   * 
   * <p>
   * <b>Note:</b> This method is accessed in the current executing thread. Such thread may or may not be the event
   * dispatch thread (EDT). Client code must call this method from the EDT.
   * </p>
   * 
   * @param c the target window-like {@code Container}.
   * @return the coordinates of the 'close' button.
   */
  @RunsInCurrentThread
  static @Nonnull Point closeButtonLocation(@Nonnull Container c) {
    Insets insets = c.getInsets();
    if (isOSX()) {
      return new Point(insets.left + 15, insets.top / 2);
    }
    return new Point(c.getWidth() - insets.right - 10, insets.top / 2);
  }

  /**
   * <p>
   * Identifies the coordinates of the 'maximize' button.
   * </p>
   * 
   * <p>
   * <b>Note:</b> This method is accessed in the current executing thread. Such thread may or may not be the event
   * dispatch thread (EDT). Client code must call this method from the EDT.
   * </p>
   * 
   * @param c the target window-like {@code Container}.
   * @return the coordinates of the 'maximize' button.
   */
  @RunsInCurrentThread
  static @Nonnull Point maximizeButtonLocation(@Nonnull Container c) {
    Point p = iconifyButtonLocation(c);
    p.x += MAXIMIZE_BUTTON_OFFSET;
    return p;
  }

  /**
   * <p>
   * Identifies the coordinates of the 'iconify' button, returning (0, 0) if not found.
   * </p>
   * 
   * <p>
   * <b>Note:</b> This method is accessed in the current executing thread. Such thread may or may not be the event
   * dispatch thread (EDT). Client code must call this method from the EDT.
   * </p>
   * 
   * @param c the target window-like {@code Container}.
   * @return the coordinates of the 'iconify' button, returning (0, 0) if not found.
   */
  @RunsInCurrentThread
  static @Nonnull Point iconifyButtonLocation(@Nonnull Container c) {
    Insets insets = c.getInsets();
    // From Abbot: We know the exact layout of the window manager frames for w32 and OSX. Currently no way of detecting
    // the WM under X11. Maybe we could send a WM message (WM_ICONIFY)?
    Point p = new Point();
    p.y = insets.top / 2;
    if (isOSX()) {
      p.x = 35;
    }
    if (isWindows()) {
      int offset = isWindowsXP() ? 64 : 45;
      p.x = c.getWidth() - insets.right - offset;
    }
    return p;
  }

  private WindowLikeContainers() {
  }
}