/*

 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.awt.Toolkit;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.lang.reflect.Modifier;

import java.util.Comparator;

import java.util.Iterator;

import java.util.Set;

import java.util.TreeSet;

import javax.swing.JFrame;

import javax.swing.SwingUtilities;

/**

 * SwingTest is a utility class for writing regression tests

 * that require interacting with the UI.

 * It uses reflection to invoke all public methods without parameters.

 * All static methods are starting on the current thread.

 * Other methods including constructor are starting on the EDT.

 * Between each method invocation all pending events are processed.

 * The methods are sorted by name and invoked in that order.

 * Failure of the test is signaled by any method throwing an exception.

 * If no methods throw an exception the test is assumed to have passed.

 *

 * @author Sergey A. Malenkov

 */

final class SwingTest implements Runnable {

    private static final int WIDTH = 640;

    private static final int HEIGHT = 480;

    public static void start(Class<?> type) throws Throwable {

        new SwingTest(type).start();

    }

    private final Class<?> type;

    private final Iterator<Method> methods;

    private JFrame frame;

    private Object object;

    private Method method;

    private Throwable error;

    private SwingTest(Class<?> type) {

        Set<Method> methods = new TreeSet<Method>(new Comparator<Method>() {

            public int compare(Method first, Method second) {

                return first.getName().compareTo(second.getName());

            }

        });

        for (Method method : type.getMethods()) {

            if (method.getDeclaringClass().equals(type)) {

                if (method.getReturnType().equals(void.class)) {

                    if (0 == method.getParameterTypes().length) {

                        methods.add(method);

                    }

                }

            }

        }

        this.type = type;

        this.methods = methods.iterator();

    }

    public void run() {

        try {

            if (this.object == null) {

                System.out.println(this.type);

                this.frame = new JFrame(this.type.getSimpleName());

                this.frame.setSize(WIDTH, HEIGHT);

                this.frame.setLocationRelativeTo(null);

                this.object = this.type.getConstructor(this.frame.getClass()).newInstance(this.frame);

                this.frame.setVisible(true);

            }

            else if (this.method != null) {

                System.out.println(this.method);

                this.method.invoke(this.object);

            }

            else {

                System.out.println((this.error == null) ? "PASSED" : "FAILED"); // NON-NLS: debug

                this.frame.dispose();

                this.frame = null;

            }

        }

        catch (NoSuchMethodException exception) {

            this.error = exception;

        }

        catch (SecurityException exception) {

            this.error = exception;

        }

        catch (IllegalAccessException exception) {

            this.error = exception;

        }

        catch (IllegalArgumentException exception) {

            this.error = exception;

        }

        catch (InstantiationException exception) {

            this.error = exception;

        }

        catch (InvocationTargetException exception) {

            this.error = exception.getTargetException();

        }

        System.out.flush();

        this.method = this.methods.hasNext() && (this.error == null)

                ? this.methods.next()

                : null;

    }

    private void start() throws Throwable {

        do {

            if ((this.method != null) && Modifier.isStatic(this.method.getModifiers())) {

                run(); // invoke static method on the current thread

            }

            else {

                SwingUtilities.invokeLater(this); // invoke on the event dispatch thread

            }

            java.awt.Robot robot = new java.awt.Robot();

            robot.waitForIdle();

        }

        while (this.frame != null);

        if (this.error != null) {

            throw this.error;

        }

    }

}