/******************************************************************************* 
 * Copyright (c) 2016 Red Hat, Inc. 
 * Distributed under license by Red Hat, Inc. All rights reserved. 
 * This program is made available under the terms of the 
 * Eclipse Public License v1.0 which accompanies this distribution, 
 * and is available at http://www.eclipse.org/legal/epl-v10.html 
 * 
 * Contributors: 
 * Red Hat, Inc. - initial API and implementation 
 ******************************************************************************/

package com.openshift.internal.restclient.api.capabilities;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

import com.openshift.internal.restclient.capability.AbstractCapability;
import com.openshift.restclient.IClient;
import com.openshift.restclient.ResourceKind;
import com.openshift.restclient.api.ITypeFactory;
import com.openshift.restclient.api.capabilities.IScalable;
import com.openshift.restclient.apis.autoscaling.models.IScale;
import com.openshift.restclient.http.IHttpConstants;
import com.openshift.restclient.model.IReplicationController;

/**
 * Implementation of the scalable interface. Applies to a deploymentconfig for
 * the moment
 *
 */
public class ScaleCapability extends AbstractCapability implements IScalable {

    private static final Map<String, String> ARG_KINDS = new HashMap<>();

    static {
        ARG_KINDS.put(ResourceKind.DEPLOYMENT_CONFIG, "extensions/v1beta1.Scale");
        ARG_KINDS.put(ResourceKind.REPLICATION_CONTROLLER, "autoscaling/v1.Scale");
    }

    private static final int MIN_VALUE = 0;
    private static final String CAPABILITY = "scale";
    private final IClient client;
    private IReplicationController rc;
    private final ITypeFactory factory;

    public ScaleCapability(IReplicationController rc, IClient client, ITypeFactory factory) {
        super(rc, client, CAPABILITY);
        this.client = client;
        this.rc = rc;
        this.factory = factory;
    }

    @Override
    public String getName() {
        return ScaleCapability.class.getSimpleName();
    }

    @Override
    public IScale scaleTo(int replicas) {
        replicas = replicas >= MIN_VALUE ? replicas : MIN_VALUE;
        IScale scale = (IScale) factory.stubKind(ARG_KINDS.get(rc.getKind()), Optional.of(rc.getName()),
                Optional.of(rc.getNamespaceName()));
        scale.setSpecReplicas(replicas);
        return client.execute(factory, IHttpConstants.PUT, rc.getKind(), rc.getNamespaceName(), rc.getName(),
                CAPABILITY, null, scale, Collections.emptyMap());
    }

}
