/*
 * 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.karaf.shell.commands.impl;

import org.apache.karaf.shell.api.action.Action;
import org.apache.karaf.shell.api.action.Argument;
import org.apache.karaf.shell.api.action.Command;
import org.apache.karaf.shell.api.action.Option;
import org.apache.karaf.shell.api.action.lifecycle.Reference;
import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.apache.karaf.shell.api.console.Session;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;

@Command(scope = "shell", name = "alias", description = "Create an alias to a command")
@Service
public class AliasAction implements Action {

    @Argument(index = 0, name = "command", description = "The command to alias, e.g. 'ldn = { log:display -n $args }'", required = true, multiValued = false)
    private String alias;

    @Option(name = "--persist", aliases = "-p", description = "Add this flag to persist the alias in ${karaf.etc}/shell.init.script")
    private boolean persist;

    @Reference
    Session session;

    @Override
    public Object execute() throws Exception {
        session.execute(alias);

        if (persist) {
            String karafEtc = session.get("karaf.etc").toString();
            try (OutputStreamWriter writer = new OutputStreamWriter(new BufferedOutputStream(new FileOutputStream(new File(karafEtc, "shell.init.script"), true)))) {
                writer.write("\n" + alias + ";");
            }
        }

        return null;
    }

}
