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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.cassandra.distributed.api;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.management.Notification;

import org.apache.cassandra.distributed.shared.AssertUtils;

public class NodeToolResult
{
    private final String[] commandAndArgs;
    private final int rc;
    private final List notifications;
    private final Throwable error;
    private final String stdout;
    private final String stderr;

    public NodeToolResult(String[] commandAndArgs, int rc, List notifications, Throwable error)
    {
        this(commandAndArgs, rc, notifications, error, null, null);
    }

    public NodeToolResult(String[] commandAndArgs, int rc, List notifications, Throwable error, String stdout, String stderr)
    {
        this.commandAndArgs = commandAndArgs;
        this.rc = rc;
        this.notifications = notifications;
        this.error = error;
        this.stdout = stdout;
        this.stderr = stderr;
    }

    public String[] getCommandAndArgs()
    {
        return commandAndArgs;
    }

    public int getRc()
    {
        return rc;
    }

    public List getNotifications()
    {
        return notifications;
    }

    public Throwable getError()
    {
        return error;
    }

    public String getStdout()
    {
        return stdout;
    }

    public String getStderr()
    {
        return stderr;
    }

    public Asserts asserts()
    {
        return new Asserts();
    }

    public final class Asserts
    {
        public Asserts success()
        {
            if (rc != 0)
                fail("was not successful");
            return this;
        }

        public Asserts failure()
        {
            if (rc == 0)
                fail("was successful but not expected to be");
            return this;
        }

        public Asserts errorContains(String msg)
        {
            return errorContainsAny(msg);
        }

        public Asserts errorContainsAny(String... messages)
        {
            AssertUtils.assertNotEquals("no error messages defined to check against", 0, messages.length);
            AssertUtils.assertNotNull("No exception was found but expected one", error);
            if (!Stream.of(messages).anyMatch(msg -> error.getMessage().contains(msg)))
                fail("Error message '" + error.getMessage() + "' does not contain any of " + Arrays.toString(messages));
            return this;
        }

        public Asserts notificationContains(String msg)
        {
            AssertUtils.assertNotNull("notifications not defined", notifications);
            AssertUtils.assertFalse("notifications not defined", notifications.isEmpty());
            for (Notification n : notifications)
            {
                if (n.getMessage().contains(msg))
                {
                    return this;
                }
            }
            fail("Unable to locate message " + msg + " in notifications: " + NodeToolResult.toString(notifications));
            return this; // unreachable
        }

        public Asserts notificationContains(ProgressEventType type, String msg)
        {
            int userType = type.ordinal();
            AssertUtils.assertNotNull("notifications not defined", notifications);
            AssertUtils.assertFalse("notifications not defined", notifications.isEmpty());
            for (Notification n : notifications)
            {
                if (notificationType(n) == userType)
                {
                    if (n.getMessage().contains(msg))
                    {
                        return this;
                    }
                }
            }
            fail("Unable to locate message '" + msg + "' in notifications: " + NodeToolResult.toString(notifications));
            return this; // unreachable
        }

        public Asserts stdoutContains(String substring)
        {
            return assertConsoleOutput(substring, true, true);
        }

        public Asserts stderrContains(String substring)
        {
            return assertConsoleOutput(substring, false, true);
        }

        public Asserts stdoutNotContains(String substring)
        {
            return assertConsoleOutput(substring, true, false);
        }

        public Asserts stderrNotContains(String substring)
        {
            return assertConsoleOutput(substring, false, false);
        }

        private Asserts assertConsoleOutput(String substring, boolean isStdout, boolean assertContains)
        {
            String name = isStdout ? "stdout" : "stderr";
            String output = isStdout ? stdout : stderr;
            AssertUtils.assertNotNull(name + " not defined", output);
            if (assertContains)
            {
                if (output.contains(substring))
                {
                    return this;
                }
                fail("Unable to locate substring '" + substring + "' in " + name + ": " + output);
            }
            else
            {
                if (!output.contains(substring))
                {
                    return this;
                }
                fail("Found unexpected substring '" + substring + "' in " + name + ": " + output);
            }

            return this; // unreachable
        }

        private void fail(String message)
        {
            StringBuilder sb = new StringBuilder();
            sb.append("nodetool command ").append(Arrays.toString(commandAndArgs)).append(" ").append(message).append("\n");
            if (stdout != null)
                sb.append("stdout:\n").append(stdout).append("\n");
            if (stderr != null)
                sb.append("stderr:\n").append(stderr).append("\n");
            sb.append("Notifications:\n");
            for (Notification n : notifications)
                sb.append(NodeToolResult.toString(n)).append("\n");
            if (error != null)
                sb.append("Error:\n").append(getStackTraceAsString(error)).append("\n");
            throw new AssertionError(sb.toString());
        }
    }

    private static String getStackTraceAsString(Throwable throwable)
    {
        StringWriter stringWriter = new StringWriter();
        throwable.printStackTrace(new PrintWriter(stringWriter));
        return stringWriter.toString();
    }

    private static String toString(Collection notifications)
    {
        return notifications.stream().map(NodeToolResult::toString).collect(Collectors.joining(", "));
    }

    private static String toString(Notification notification)
    {
        ProgressEventType type = ProgressEventType.values()[notificationType(notification)];
        String msg = notification.getMessage();
        Object src = notification.getSource();
        return "Notification{" +
               "type=" + type +
               ", src=" + src +
               ", message=" + msg +
               "}";
    }

    private static int notificationType(Notification n)
    {
        return ((Map) n.getUserData()).get("type").intValue();
    }

    public String toString()
    {
        return "NodeToolResult{" +
               "commandAndArgs=" + Arrays.toString(commandAndArgs) +
               ", rc=" + rc +
               ", notifications=[" + notifications.stream().map(n -> ProgressEventType.values()[notificationType(n)].name()).collect(Collectors.joining(", ")) + "]" +
               ", error=" + error +
               '}';
    }

    /**
     * Progress event type.
     *
     * 
     * Progress starts by emitting {@link #START}, followed by emitting zero or more {@link #PROGRESS} events,
     * then it emits either one of {@link #ERROR}/{@link #ABORT}/{@link #SUCCESS}.
     * Progress indicates its completion by emitting {@link #COMPLETE} at the end of process.
     * 
     * 
     * {@link #NOTIFICATION} event type is used to just notify message without progress.
     * 
     */
    public enum ProgressEventType
    {
        /**
         * Fired first when progress starts.
         * Happens only once.
         */
        START,

        /**
         * Fire when progress happens.
         * This can be zero or more time after START.
         */
        PROGRESS,

        /**
         * When observing process completes with error, this is sent once before COMPLETE.
         */
        ERROR,

        /**
         * When observing process is aborted by user, this is sent once before COMPLETE.
         */
        ABORT,

        /**
         * When observing process completes successfully, this is sent once before COMPLETE.
         */
        SUCCESS,

        /**
         * Fire when progress complete.
         * This is fired once, after ERROR/ABORT/SUCCESS is fired.
         * After this, no more ProgressEvent should be fired for the same event.
         */
        COMPLETE,

        /**
         * Used when sending message without progress.
         */
        NOTIFICATION
    }
}