/*
 * 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.maven.surefire.api.booter;

import java.util.Objects;

import static java.util.Objects.requireNonNull;
import static org.apache.maven.surefire.shared.utils.StringUtils.isBlank;

/**
 * Encapsulates data and command sent from master to forked process.
 *
 * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
 * @since 2.19
 */
public final class Command {
    public static final Command TEST_SET_FINISHED = new Command(MasterProcessCommand.TEST_SET_FINISHED);
    public static final Command SKIP_SINCE_NEXT_TEST = new Command(MasterProcessCommand.SKIP_SINCE_NEXT_TEST);
    public static final Command NOOP = new Command(MasterProcessCommand.NOOP);
    public static final Command BYE_ACK = new Command(MasterProcessCommand.BYE_ACK);

    private final MasterProcessCommand command;
    private final String data;

    public Command(MasterProcessCommand command, String data) {
        this.command = requireNonNull(command);
        this.data = data;
    }

    public Command(MasterProcessCommand command) {
        this(command, null);
    }

    public static Command toShutdown(Shutdown shutdownType) {
        return new Command(MasterProcessCommand.SHUTDOWN, shutdownType.name());
    }

    public static Command toRunClass(String runClass) {
        return new Command(MasterProcessCommand.RUN_CLASS, runClass);
    }

    public MasterProcessCommand getCommandType() {
        return command;
    }

    public String getData() {
        return data;
    }

    /**
     * @return {@link Shutdown} or {@link Shutdown#DEFAULT} if {@link #getData()} is null or blank string
     * @throws IllegalArgumentException if string data {@link #getData()} is not applicable to enum {@link Shutdown}
     */
    public Shutdown toShutdownData() {
        if (command != MasterProcessCommand.SHUTDOWN) {
            throw new IllegalStateException("expected MasterProcessCommand.SHUTDOWN");
        }
        return isBlank(data) ? Shutdown.DEFAULT : Shutdown.valueOf(data);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Command arg = (Command) o;

        return command == arg.command && Objects.equals(data, arg.data);
    }

    @Override
    public int hashCode() {
        int result = command.hashCode();
        result = 31 * result + (data != null ? data.hashCode() : 0);
        return result;
    }
}
