/**
 *  Copyright 2005-2015 Red Hat, Inc.
 *
 *  Red Hat 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 io.fabric8.commands;

import io.fabric8.api.Containers;
import io.fabric8.api.FabricService;
import io.fabric8.api.ProfileRequirements;
import io.fabric8.utils.FabricValidations;

import java.io.PrintStream;

import org.apache.felix.gogo.commands.Argument;
import org.apache.felix.gogo.commands.Command;
import org.apache.felix.gogo.commands.CompleterValues;
import org.apache.karaf.shell.console.AbstractAction;

@Command(name = ProfileScale.FUNCTION_VALUE, scope = ProfileScale.SCOPE_VALUE, description = ProfileScale.DESCRIPTION)
public class ProfileScaleAction extends AbstractAction {

    @Argument(index = 0, required = true, name = "profile", description = "The name of the profile to scale up or down.")
    @CompleterValues(index = 0)
    private String name;
    @Argument(index = 1, required = false, name = "count", description = "The number of instances to increase or decrease. Positive number means increase and Negative number  means decrease")
    private int count = 1;

    private final FabricService fabricService;

    ProfileScaleAction(FabricService fabricService) {
        this.fabricService = fabricService;
    }

    public FabricService getFabricService() {
        return fabricService;
    }

    @Override
    protected Object doExecute() throws Exception {
        try {
            FabricValidations.validateProfileName(name);
        } catch (IllegalArgumentException e) {
            // we do not want exception in the server log, so print the error message to the console
            System.out.println(e.getMessage());
            return null;
        }

        fabricService.scaleProfile(name, count);
        ProfileRequirements profileRequirements = fabricService.getRequirements().getOrCreateProfileRequirement(name);
        Integer minimumInstances = profileRequirements.getMinimumInstances();
        int size = Containers.containersForProfile(fabricService.getContainers(), name).size();
        PrintStream output = System.out;
        output.println("Profile " + name + " " + (minimumInstances != null
                ? "now requires " + minimumInstances + " container(s)"
                : "does not require any containers") + " currently has " + size + " container(s) running");
        return null;
    }
}
