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/*
 * Copyright (c) 2008-2022 The Aspectran Project
 *
 * Licensed 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 com.aspectran.shell.command.builtins;

import com.aspectran.shell.command.AbstractCommand;
import com.aspectran.shell.command.CommandRegistry;
import com.aspectran.shell.command.option.Arguments;
import com.aspectran.shell.command.option.Option;
import com.aspectran.shell.command.option.ParsedOptions;
import com.aspectran.shell.console.Console;

/**
 * Displays a message on the screen.
 */
public class EchoCommand extends AbstractCommand {

    private static final String NAMESPACE = "builtins";

    private static final String COMMAND_NAME = "echo";

    private final CommandDescriptor descriptor = new CommandDescriptor();

    public EchoCommand(CommandRegistry registry) {
        super(registry);

        addOption(Option.builder("h")
                .longName("help")
                .desc("Display help for this command")
                .build());

        Arguments arguments = touchArguments();
        arguments.put("", "Specifies the text to display on the screen");
        arguments.setRequired(false);
    }

    @Override
    public void execute(ParsedOptions options, Console console) throws Exception {
        if (options.hasOption("help")) {
            printHelp(console);
        } else {
            String message = String.join(" ", options.getArgs());
            console.writeLine(message);
        }
    }

    @Override
    public Descriptor getDescriptor() {
        return descriptor;
    }

    private static class CommandDescriptor implements Descriptor {

        @Override
        public String getNamespace() {
            return NAMESPACE;
        }

        @Override
        public String getName() {
            return COMMAND_NAME;
        }

        @Override
        public String getDescription() {
            return "Displays a message on the screen";
        }

        @Override
        public String getUsage() {
            return null;
        }

    }

}