/*
 * Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. 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.wso2.carbon.status.dashboard.core.api;

import org.osgi.framework.BundleContext;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferenceCardinality;
import org.osgi.service.component.annotations.ReferencePolicy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wso2.carbon.uis.api.App;
import org.wso2.carbon.uis.spi.RestApiProvider;
import org.wso2.msf4j.Microservice;

import java.util.HashMap;
import java.util.Map;

/**
 * Provider that supplies Microservices for the {@link #STATUS_DASHBOARD_APP_NAME} web app.
 *
 * @since 4.0.0
 */
@Component(
        service = RestApiProvider.class,
        immediate = true
)
public class MonitoringRESTApiProvider implements RestApiProvider {

    public static final String STATUS_DASHBOARD_APP_NAME = "monitoring";
    private static final Logger logger = LoggerFactory.getLogger(MonitoringRESTApiProvider.class);

    private MonitoringApiService dashboardDataProvider;

    @Activate
    protected void activate(BundleContext bundleContext) {
        logger.debug("{} activated.", this.getClass().getName());
    }

    @Deactivate
    protected void deactivate(BundleContext bundleContext) {
       logger.debug("{} deactivated.", this.getClass().getName());
    }


    @Reference(
            service = MonitoringApiService.class,
            cardinality = ReferenceCardinality.MANDATORY,
            policy = ReferencePolicy.DYNAMIC,
            unbind = "unregisterWorkersApiServiceImpl"
    )
    public void registerWorkersApiServiceImpl(MonitoringApiService monitoringApiService) {
        if (logger.isDebugEnabled()) {
            logger.debug("@Reference(bind) ServicePermissionGrantService");
        }
        this.dashboardDataProvider = monitoringApiService;

    }

    public void unregisterWorkersApiServiceImpl(MonitoringApiService monitoringApiService) {
        if (logger.isDebugEnabled()) {
            logger.debug("@Reference(unbind) ServicePermissionGrantService");
        }
        this.dashboardDataProvider = null;
    }

    @Override
    public String getAppName() {
        return STATUS_DASHBOARD_APP_NAME;
    }

    @Override
    public Map<String, Microservice> getMicroservices(App app) {
        Map<String, Microservice> microservices = new HashMap<>(2);
        microservices.put(MonitoringRESTApi.API_CONTEXT_PATH, new MonitoringRESTApi(dashboardDataProvider));
        return microservices;
    }
}
