/*-
 * ============LICENSE_START=======================================================
 * simulators
 * ================================================================================
 * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
 * Modifications Copyright (C) 2019 Nordix Foundation.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.simulators;

import java.io.IOException;
import java.util.Properties;
import org.onap.policy.common.endpoints.http.server.HttpServletServer;
import org.onap.policy.common.endpoints.http.server.HttpServletServerFactoryInstance;
import org.onap.policy.common.endpoints.properties.PolicyEndPointProperties;
import org.onap.policy.common.parameters.ParameterRuntimeException;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
import org.onap.policy.common.utils.network.NetworkUtil;
import org.onap.policy.common.utils.resources.ResourceUtils;
import org.onap.policy.models.sim.dmaap.parameters.DmaapSimParameterGroup;
import org.onap.policy.models.sim.dmaap.provider.DmaapSimProvider;
import org.onap.policy.models.sim.dmaap.rest.DmaapSimRestServer;

public class Util {
    public static final String AAISIM_SERVER_NAME = "aaiSim";
    public static final String SOSIM_SERVER_NAME = "soSim";
    public static final String VFCSIM_SERVER_NAME = "vfcSim";
    public static final String GUARDSIM_SERVER_NAME = "guardSim";
    public static final String SDNCSIM_SERVER_NAME = "sdncSim";

    public static final int AAISIM_SERVER_PORT = 6666;
    public static final int SOSIM_SERVER_PORT = 6667;
    public static final int VFCSIM_SERVER_PORT = 6668;
    public static final int GUARDSIM_SERVER_PORT = 6669;
    public static final int SDNCSIM_SERVER_PORT = 6670;
    public static final int CDSSIM_SERVER_PORT = 6671;
    public static final int DMAAPSIM_SERVER_PORT = 3904;

    private static final String CANNOT_PROCESS_PARAMETERS = "cannot parse parameters ";
    private static final String CANNOT_CONNECT = "cannot connect to port ";
    public static final String LOCALHOST = "localhost";

    private Util() {
        // Prevent instantiation of this class
    }

    /**
     * Build an A&AI simulator.
     *
     * @return the simulator
     * @throws InterruptedException if a thread is interrupted
     */
    public static HttpServletServer buildAaiSim() throws InterruptedException {
        final HttpServletServer testServer = HttpServletServerFactoryInstance.getServerFactory()
                .build(AAISIM_SERVER_NAME, LOCALHOST, AAISIM_SERVER_PORT, "/", false, true);
        testServer.addServletClass("/*", AaiSimulatorJaxRs.class.getName());
        testServer.waitedStart(5000);
        waitForServerToListen(testServer.getPort());
        return testServer;
    }

    /**
     * Build a CDS simulator.
     *
     * @return the simulator
     * @throws InterruptedException if a thread is interrupted
     * @throws IOException if an I/O error occurs
     */
    public static CdsSimulator buildCdsSim() throws InterruptedException, IOException {
        final CdsSimulator testServer = new CdsSimulator(LOCALHOST, CDSSIM_SERVER_PORT);
        testServer.start();
        waitForServerToListen(testServer.getPort());
        return testServer;
    }

    /**
     * Build an SDNC simulator.
     *
     * @return the simulator
     * @throws InterruptedException if a thread is interrupted
     */
    public static HttpServletServer buildSdncSim() throws InterruptedException {
        final HttpServletServer testServer = HttpServletServerFactoryInstance.getServerFactory()
                .build(SDNCSIM_SERVER_NAME, LOCALHOST, SDNCSIM_SERVER_PORT, "/", false, true);
        testServer.addServletClass("/*", SdncSimulatorJaxRs.class.getName());
        testServer.waitedStart(5000);
        waitForServerToListen(testServer.getPort());
        return testServer;
    }


    /**
     * Build an SO simulator.
     *
     * @return the simulator
     * @throws InterruptedException if a thread is interrupted
     */
    public static HttpServletServer buildSoSim() throws InterruptedException {
        final HttpServletServer testServer = HttpServletServerFactoryInstance.getServerFactory()
                .build(SOSIM_SERVER_NAME, LOCALHOST, SOSIM_SERVER_PORT, "/", false, true);
        testServer.addServletClass("/*", SoSimulatorJaxRs.class.getName());
        testServer.waitedStart(5000);
        waitForServerToListen(testServer.getPort());
        return testServer;
    }

    /**
     * Build a VFC simulator.
     *
     * @return the simulator
     * @throws InterruptedException if a thread is interrupted
     */
    public static HttpServletServer buildVfcSim() throws InterruptedException {
        final HttpServletServer testServer = HttpServletServerFactoryInstance.getServerFactory()
                .build(VFCSIM_SERVER_NAME, LOCALHOST, VFCSIM_SERVER_PORT, "/", false, true);
        testServer.addServletClass("/*", VfcSimulatorJaxRs.class.getName());
        testServer.waitedStart(5000);
        waitForServerToListen(testServer.getPort());
        return testServer;
    }

    /**
     * Build a guard simulator.
     *
     * @return the simulator
     * @throws InterruptedException if a thread is interrupted
     */
    public static HttpServletServer buildGuardSim() throws InterruptedException {
        HttpServletServer testServer = HttpServletServerFactoryInstance.getServerFactory().build(GUARDSIM_SERVER_NAME,
                LOCALHOST, GUARDSIM_SERVER_PORT, "/", false, true);
        testServer.addServletClass("/*", GuardSimulatorJaxRs.class.getName());
        testServer.waitedStart(5000);
        waitForServerToListen(testServer.getPort());
        return testServer;
    }

    /**
     * Build a DMaaP simulator.
     *
     * @return the simulator
     * @throws InterruptedException if a thread is interrupted
     */
    public static HttpServletServer buildDmaapSim() throws InterruptedException {
        String json = ResourceUtils.getResourceAsString("org/onap/policy/simulators/dmaap/DmaapParameters.json");
        DmaapSimParameterGroup params = null;
        try {
            params = new StandardCoder().decode(json, DmaapSimParameterGroup.class);
        } catch (CoderException ce) {
            throw new ParameterRuntimeException(
                    CANNOT_PROCESS_PARAMETERS + "org/onap/policy/simulators/dmaap/DmaapParameters.json", ce);
        }

        DmaapSimProvider.setInstance(new DmaapSimProvider(params));

        Properties props = DmaapSimRestServer.getServerProperties(params.getRestServerParameters());

        final String svcpfx = PolicyEndPointProperties.PROPERTY_HTTP_SERVER_SERVICES + "."
                + params.getRestServerParameters().getName();
        props.setProperty(svcpfx + PolicyEndPointProperties.PROPERTY_HTTP_PORT_SUFFIX,
                Integer.toString(DMAAPSIM_SERVER_PORT));
        props.setProperty(svcpfx + PolicyEndPointProperties.PROPERTY_MANAGED_SUFFIX, "true");

        HttpServletServer testServer = HttpServletServerFactoryInstance.getServerFactory().build(props).get(0);
        testServer.waitedStart(5000);
        waitForServerToListen(testServer.getPort());
        return testServer;
    }

    private static void waitForServerToListen(int port) throws InterruptedException {
        if (!NetworkUtil.isTcpPortOpen(LOCALHOST, port, 200, 250L)) {
            throw new IllegalStateException(CANNOT_CONNECT + port);
        }
    }
}