/*-
 * ============LICENSE_START=======================================================
 *  Copyright (C) 2018 Ericsson. All rights reserved.
 * ================================================================================
 * Licensed 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.distribution.main.rest;

import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import org.onap.policy.common.capabilities.Startable;
import org.onap.policy.common.endpoints.http.server.HttpServletServer;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
import org.onap.policy.distribution.main.parameters.RestServerParameters;

/**
 * Class to manage life cycle of distribution rest server.
 *
 * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
 */
public class DistributionRestServer implements Startable {

    private static final String SEPARATOR = ".";
    private static final String HTTP_SERVER_SERVICES = "http.server.services";
    private static final Logger LOGGER = FlexLogger.getLogger(DistributionRestServer.class);

    private List<HttpServletServer> servers = new ArrayList<>();

    private RestServerParameters restServerParameters;

    /**
     * Constructor for instantiating DistributionRestServer.
     *
     * @param restServerParameters the rest server parameters
     */
    public DistributionRestServer(final RestServerParameters restServerParameters) {
        this.restServerParameters = restServerParameters;
    }

    /**
     * {@inheritDoc}.
     */
    @Override
    public boolean start() {
        try {
            servers = HttpServletServer.factory.build(getServerProperties());
            for (final HttpServletServer server : servers) {
                server.start();
            }
        } catch (final Exception exp) {
            LOGGER.error("Failed to start distribution http server", exp);
            return false;
        }
        return true;
    }

    /**
     * Creates the server properties object using restServerParameters.
     *
     * @return the properties object
     */
    private Properties getServerProperties() {
        final Properties props = new Properties();
        props.setProperty(HTTP_SERVER_SERVICES, restServerParameters.getName());
        props.setProperty(HTTP_SERVER_SERVICES + SEPARATOR + restServerParameters.getName() + ".host",
                restServerParameters.getHost());
        props.setProperty(HTTP_SERVER_SERVICES + SEPARATOR + restServerParameters.getName() + ".port",
                Integer.toString(restServerParameters.getPort()));
        props.setProperty(HTTP_SERVER_SERVICES + SEPARATOR + restServerParameters.getName() + ".restClasses",
                DistributionRestController.class.getCanonicalName());
        props.setProperty(HTTP_SERVER_SERVICES + SEPARATOR + restServerParameters.getName() + ".managed", "false");
        props.setProperty(HTTP_SERVER_SERVICES + SEPARATOR + restServerParameters.getName() + ".swagger", "true");
        props.setProperty(HTTP_SERVER_SERVICES + SEPARATOR + restServerParameters.getName() + ".userName",
                restServerParameters.getUserName());
        props.setProperty(HTTP_SERVER_SERVICES + SEPARATOR + restServerParameters.getName() + ".password",
                restServerParameters.getPassword());
        props.setProperty(HTTP_SERVER_SERVICES + SEPARATOR + restServerParameters.getName() + ".https",
                String.valueOf(restServerParameters.isHttps()));
        return props;
    }

    /**
     * {@inheritDoc}.
     */
    @Override
    public boolean stop() {
        for (final HttpServletServer server : servers) {
            try {
                server.stop();
            } catch (final Exception exp) {
                LOGGER.error("Failed to stop distribution http server", exp);
            }
        }
        return true;
    }

    /**
     * {@inheritDoc}.
     */
    @Override
    public void shutdown() {
        stop();
    }

    /**
     * {@inheritDoc}.
     */
    @Override
    public boolean isAlive() {
        return !servers.isEmpty();
    }

    /**
     * {@inheritDoc}.
     */
    @Override
    public String toString() {
        final StringBuilder builder = new StringBuilder();
        builder.append("DistributionRestServer [servers=");
        builder.append(servers);
        builder.append("]");
        return builder.toString();
    }

}