/*
 * Copyright (c) 2018, 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 custom.DotHandler;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.List;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * @test
 * @bug 8191033
 * @build custom.DotHandler custom.Handler
 * @run main/othervm BadRootLoggerHandlers CUSTOM
 * @run main/othervm BadRootLoggerHandlers DEFAULT
 * @author danielfuchs
 */
public class BadRootLoggerHandlers {

    public static final Path SRC_DIR =
            Paths.get(System.getProperty("test.src", "src"));
    public static final Path USER_DIR =
            Paths.get(System.getProperty("user.dir", "."));
    public static final Path CONFIG_FILE = Paths.get("badlogging.properties");

    static enum TESTS { CUSTOM, DEFAULT}
    public static final class CustomLogManager extends LogManager {
        @Override
        protected void addInitialRootLoggerHandlers() {}
    }
    public static class SystemErr extends OutputStream {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final OutputStream wrapped;
        public SystemErr(OutputStream out) {
            this.wrapped = out;
        }

        @Override
        public void write(int b) throws IOException {
            baos.write(b);
            wrapped.write(b);
        }

        public void close() throws IOException {
            flush();
            super.close();
        }

        public void flush() throws IOException {
            super.flush();
            wrapped.flush();
        }

    }

    // Uncomment this to run the test on Java 8. Java 8 does not have
    // List.of(...)
    //    static final class List {
    //        static <T> java.util.List<T> of(T... items) {
    //            return Collections.unmodifiableList(Arrays.asList(items));
    //        }
    //    }

    public static void main(String[] args) throws IOException {
        Path initialProps = SRC_DIR.resolve(CONFIG_FILE);
        Path loggingProps = USER_DIR.resolve(CONFIG_FILE);
        if (args.length != 1) {
            throw new IllegalArgumentException("expected (only) one of " + List.of(TESTS.values()));
        }

        TESTS test = TESTS.valueOf(args[0]);
        System.setProperty("java.util.logging.config.file", loggingProps.toString());
        if (test == TESTS.CUSTOM) {
            System.setProperty("java.util.logging.manager", CustomLogManager.class.getName());
        }

        Files.copy(initialProps, loggingProps, StandardCopyOption.REPLACE_EXISTING);

        SystemErr err = new SystemErr(System.err);
        System.setErr(new PrintStream(err));

        System.out.println("Root level is: " + Logger.getLogger("").getLevel());
        if (Logger.getLogger("").getLevel() != Level.INFO) {
            throw new RuntimeException("Expected root level INFO, got: "
                                        + Logger.getLogger("").getLevel());
        }

        Class<? extends LogManager> logManagerClass =
                LogManager.getLogManager().getClass();
        Class<? extends LogManager> expectedClass =
                test == TESTS.CUSTOM ? CustomLogManager.class : LogManager.class;
        if (logManagerClass != expectedClass) {
            throw new RuntimeException("Bad class for log manager: " + logManagerClass
                                        + " expected " + expectedClass + " for " + test);
        }

        if (test == TESTS.DEFAULT) {
            // Verify that we have two handlers. One was configured with
            // handlers=custom.Handler, the other with
            // .handlers=custom.DotHandler
            // Verify that exactly one of the two handlers is a custom.Handler
            // Verify that exactly one of the two handlers is a custom.DotHandler
            // Verify that the two handlers have an id of '1'
            checkHandlers(Logger.getLogger("").getHandlers(),
                    1L,
                    custom.Handler.class,
                    custom.DotHandler.class);
        } else {
            // Verify that we have one handler, configured with
            // handlers=custom.Handler.
            // Verify that it is a custom.Handler
            // Verify that the handler have an id of '1'
            checkHandlers(Logger.getLogger("").getHandlers(),
                    1L,
                    custom.Handler.class);

        }

        // DEFAULT: The log message "hi" should appear twice on the console.
        // CUSTOM: The log message "hi" should appear twice on the console.
        // We don't check that. This is just for log analysis in case
        // of test failure.
        Logger.getAnonymousLogger().info("hi (" + test +")");

        // Change the root logger level to FINE in the properties file
        // and reload the configuration.
        Files.write(loggingProps,
                Files.lines(initialProps)
                        .map((s) -> s.replace("INFO", "FINE"))
                        .collect(Collectors.toList()));
        LogManager.getLogManager().readConfiguration();

        System.out.println("Root level is: " + Logger.getLogger("").getLevel());
        if (Logger.getLogger("").getLevel() != Level.FINE) {
            throw new RuntimeException("Expected root level FINE, got: "
                    + Logger.getLogger("").getLevel());
        }

        // Verify that we have now only one handler, configured with
        // handlers=custom.Handler, and that the other configured with
        // .handlers=custom.DotHandler was ignored.
        // Verify that the handler is a custom.Handler
        // Verify that the handler has an id of '2'
        checkHandlers(Logger.getLogger("").getHandlers(),
                2L,
                custom.Handler.class);

        // The log message "there" should appear only once on the console.
        // We don't check that. This is just for log analysis in case
        // of test failure.
        Logger.getAnonymousLogger().info("there!");

        // Change the root logger level to FINER in the properties file
        // and reload the configuration.
        Files.write(loggingProps,
                Files.lines(initialProps)
                        .map((s) -> s.replace("INFO", "FINER"))
                        .collect(Collectors.toList()));
        LogManager.getLogManager().readConfiguration();

        System.out.println("Root level is: " + Logger.getLogger("").getLevel());
        if (Logger.getLogger("").getLevel() != Level.FINER) {
            throw new RuntimeException("Expected root level FINER, got: "
                    + Logger.getLogger("").getLevel());
        }

        // Verify that we have only one handler, configured with
        // handlers=custom.Handler, and that the other configured with
        // .handlers=custom.DotHandler was ignored.
        // Verify that the handler is a custom.Handler
        // Verify that the handler has an id of '3'
        checkHandlers(Logger.getLogger("").getHandlers(),
                3L,
                custom.Handler.class);

        // The log message "done" should appear only once on the console.
        // We don't check that. This is just for log analysis in case
        // of test failure.
        Logger.getAnonymousLogger().info("done!");

        byte[] errBytes = err.baos.toByteArray();
        String errText = new String(errBytes);
        switch(test) {
            case CUSTOM:
                if (errText.contains("java.lang.ClassNotFoundException: 1"
                        + DotHandler.class.getName())) {
                    throw new RuntimeException("Error message found on System.err");
                }
                System.out.println("OK: ClassNotFoundException error message not found for " + test);
                break;
            case DEFAULT:
                if (!errText.contains("java.lang.ClassNotFoundException: 1"
                        + DotHandler.class.getName())) {
                    throw new RuntimeException("Error message not found on System.err");
                }
                System.err.println("OK: ClassNotFoundException error message found for " + test);
                break;
            default:
                throw new InternalError("unknown test case: " + test);
        }
    }

    static void checkHandlers(Handler[] handlers, Long expectedID, Class<?>... clz) {
        // Verify that we have the expected number of handlers.
        if (Stream.of(handlers).count() != clz.length) {
            throw new RuntimeException("Expected " + clz.length + " handlers, got: "
                    + List.of(Logger.getLogger("").getHandlers()));
        }
        for (Class<?> cl : clz) {
            // Verify that the handlers are of the expected class.
            // For each class, we should have exactly one handler
            // of that class.
            if (Stream.of(handlers)
                    .map(Object::getClass)
                    .filter(cl::equals)
                    .count() != 1) {
                throw new RuntimeException("Expected one " + cl +", got: "
                        + List.of(Logger.getLogger("").getHandlers()));
            }
        }
        // Verify that all handlers have the expected ID
        if (Stream.of(Logger.getLogger("").getHandlers())
                .map(RootLoggerHandlers::getId)
                .filter(expectedID::equals)
                .count() != clz.length) {
            throw new RuntimeException("Expected ids to be " + expectedID + ", got: "
                    + List.of(Logger.getLogger("").getHandlers()));
        }
    }

    static long getId(Handler h) {
        if (h instanceof custom.Handler) {
            return ((custom.Handler)h).id;
        }
        if (h instanceof custom.DotHandler) {
            return ((custom.DotHandler)h).id;
        }
        return -1;
    }
}