/**
 * 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.monitor;

import static java.util.logging.Level.WARNING;
import static org.assertj.swing.edt.GuiActionRunner.execute;
import static org.assertj.swing.monitor.WindowMetrics.absoluteCenterOf;
import static org.assertj.swing.query.ComponentSizeQuery.sizeOf;

import java.awt.AWTException;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Robot;
import java.awt.Window;
import java.util.logging.Logger;

import javax.annotation.Nonnull;

import org.assertj.swing.annotation.RunsInCurrentThread;
import org.assertj.swing.annotation.RunsInEDT;
import org.assertj.swing.util.RobotFactory;

/**
 * Verification of the state of a window.
 *
 * @author Alex Ruiz
 */
class WindowStatus {
  private static final Dimension MINIMUM_WINDOW_SIZE = new Dimension(50, 30);

  private static Logger logger = Logger.getLogger(WindowStatus.class.getCanonicalName());
  private static int sign = 1;

  private final Windows windows;

  final Robot robot;

  WindowStatus(@Nonnull Windows windows) {
    this(windows, new RobotFactory());
  }

  WindowStatus(@Nonnull Windows windows, @Nonnull RobotFactory robotFactory) {
    this.windows = windows;
    Robot r = null;
    try {
      r = robotFactory.newRobotInLeftScreen();
    } catch (AWTException ignored) {
      logger.log(WARNING, "Error ocurred when creating a new Robot", ignored);
    }
    robot = r;
  }

  @Nonnull
  Windows windows() {
    return windows;
  }

  /**
   * Checks whether the given window is ready for input.
   *
   * @param w the given window.
   */
  @RunsInEDT
  void checkIfReady(@Nonnull Window w) {
    if (robot == null) {
      return;
    }
    try {
      checkSafelyIfReady(w);
    } catch (Exception ignored) {
      // TODO We are getting InterruptedException in Xwnc
      // http://groups.google.com/group/easytesting/browse_frm/thread/116cc070ab7b22e6
      logger.log(WARNING, "Error ocurred when checking if window is ready", ignored);
    }
  }

  @RunsInEDT
  private void checkSafelyIfReady(final @Nonnull Window w) {
    if (!windows.isShowingButNotReady(w)) {
      return;
    }
    execute(() -> makeLargeEnoughToReceiveEvents(w));
    mouseMove(w, centerOf(w));
  }

  @RunsInEDT
  private static Point centerOf(final @Nonnull Window w) {
    return execute(() -> absoluteCenterOf(w));
  }

  @RunsInEDT
  private void mouseMove(@Nonnull Window w, @Nonnull Point point) {
    int x = point.x;
    int y = point.y;
    if (x == 0 || y == 0) {
      return;
    }
    robot.mouseMove(x, y);
    Dimension windowSize = sizeOf(w);
    if (windowSize.width > windowSize.height) {
      robot.mouseMove(x + sign, y);
    } else {
      robot.mouseMove(x, y + sign);
    }
    sign = -sign;
  }

  @RunsInCurrentThread
  private void makeLargeEnoughToReceiveEvents(@Nonnull Window window) {
    if (!shouldResize(window)) {
      return;
    }
    window.setSize(MINIMUM_WINDOW_SIZE);
  }

  @RunsInCurrentThread
  private boolean shouldResize(@Nonnull Window window) {
    Insets insets = window.getInsets();
    int w = window.getWidth() - (insets.left + insets.right);
    if (w < MINIMUM_WINDOW_SIZE.width) {
      return true;
    }
    int h = window.getHeight() - (insets.top + insets.bottom);
    return h < MINIMUM_WINDOW_SIZE.height;
  }

  static int sign() {
    return sign;
  }
}