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 * 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.

 *

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 */

/*

 * @test

 * @summary Subscribe tests

 * @build KullaTesting TestingInputStream

 * @run testng SnippetStatusListenerTest

 */

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.function.Consumer;

import jdk.jshell.DeclarationSnippet;

import jdk.jshell.JShell.Subscription;

import jdk.jshell.SnippetEvent;

import jdk.jshell.TypeDeclSnippet;

import org.testng.annotations.Test;

import static jdk.jshell.Snippet.Status.*;

import static org.testng.Assert.assertEquals;

@Test

public class SnippetStatusListenerTest extends KullaTesting {

    public void testTwoSnippetEventListeners() {

        SnippetListener listener1 = new SnippetListener();

        SnippetListener listener2 = new SnippetListener();

        Subscription subscription1 = getState().onSnippetEvent(listener1);

        getState().onSnippetEvent(listener2);

        TypeDeclSnippet a = classKey(assertEval("class A {}"));

        assertEval("interface A {}",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(a, VALID, OVERWRITTEN, false, null));

        DeclarationSnippet f = (DeclarationSnippet) assertDeclareFail("double f() { }", "compiler.err.missing.ret.stmt");

        assertEvalException("throw new RuntimeException();");

        assertEval("int a = 0;");

        List<SnippetEvent> events1 = Collections.unmodifiableList(listener1.getEvents());

        assertEquals(events1, listener2.getEvents(), "Checking got events");

        getState().unsubscribe(subscription1);

        assertDrop(f, DiagCheck.DIAG_IGNORE, DiagCheck.DIAG_IGNORE, ste(f, REJECTED, DROPPED, false, null));

        assertEval("void f() { }", ste(MAIN_SNIPPET, DROPPED, VALID, true, null));

        assertEvalException("throw new RuntimeException();");

        assertEquals(listener1.getEvents(), events1, "Checking that unsubscribed listener does not get events");

        List<SnippetEvent> events2 = new ArrayList<>(listener2.getEvents());

        events2.removeAll(events1);

        assertEquals(events2.size(), 3, "The second listener got events");

    }

    @Test(expectedExceptions = NullPointerException.class)

    public void testNullCallback() {

        getState().onSnippetEvent(null);

    }

    @Test(expectedExceptions = IllegalStateException.class)

    public void testSubscriptionAfterClose() {

        getState().close();

        getState().onSnippetEvent(e -> {});

    }

    @Test(expectedExceptions = IllegalStateException.class,

          enabled = false) //TODO 8139873

    public void testSubscriptionAfterShutdown() {

        assertEval("System.exit(0);");

        getState().onSnippetEvent(e -> {});

    }

    public void testSubscriptionToAnotherState() {

        SnippetListener listener = new SnippetListener();

        Subscription subscription = getState().onSnippetEvent(listener);

        tearDown();

        setUp();

        assertEval("int x;");

        assertEquals(Collections.emptyList(), listener.getEvents(), "No events");

        getState().unsubscribe(subscription);

    }

    private static class SnippetListener implements Consumer<SnippetEvent> {

        private final List<SnippetEvent> events = new ArrayList<>();

        @Override

        public void accept(SnippetEvent event) {

            events.add(event);

        }

        public List<SnippetEvent> getEvents() {

            return events;

        }

    }

}