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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.ow2.shelbie.commands.builtin.internal;

import java.util.List;

import org.apache.felix.gogo.commands.Action;
import org.apache.felix.gogo.commands.Argument;
import org.apache.felix.gogo.commands.Command;
import org.apache.felix.gogo.commands.Option;
import org.apache.felix.ipojo.annotations.Component;
import org.apache.felix.ipojo.annotations.HandlerDeclaration;
import org.apache.felix.service.command.CommandSession;
import org.fusesource.jansi.Ansi;

@Component
@Command(name = "echo",
        scope = "shelbie",
        description = "Echoes or prints arguments to STDOUT.")
@HandlerDeclaration("")
public class EchoAction implements Action {

    @Option(name = "-n", aliases = {}, description = "Do not print the trailing newline character", required = false, multiValued = false)
    private boolean noTrailingNewline;

    @Argument(index = 0, name = "arguments", description="Arguments to display separated by whitespaces", required = false, multiValued = true)
    private List args;

    public Object execute(CommandSession commandSession) throws Exception {
        Ansi ansi = Ansi.ansi();

        if (args != null) {
            boolean first = true;
            for (String arg : args) {
                if (first) {
                    first = false;
                } else {
                    ansi.a(" ");
                }
                ansi.render(arg);
            }
            System.out.print(ansi.toString());
        }
        if (!noTrailingNewline) {
            System.out.println();
        }
        return null;
    }
}