/*
 * ============LICENSE_START=======================================================
 * PROJECT
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.dcae.restapi;

import com.att.nsa.apiServer.CommonServlet;
import com.att.nsa.configs.ConfigDbException;
import com.att.nsa.drumlin.service.framework.DrumlinErrorHandler;
import com.att.nsa.drumlin.service.framework.context.DrumlinRequestContext;
import com.att.nsa.drumlin.service.framework.routing.DrumlinRequestRouter;
import com.att.nsa.drumlin.service.framework.routing.playish.DrumlinPlayishRoutingFileSource;
import com.att.nsa.drumlin.service.standards.HttpStatusCodes;
import com.att.nsa.drumlin.till.nv.rrNvReadable;
import com.att.nsa.drumlin.till.nv.rrNvReadable.loadException;
import com.att.nsa.drumlin.till.nv.rrNvReadable.missingReqdSetting;
import com.att.nsa.security.NsaAuthenticator;
import com.att.nsa.security.authenticators.SimpleAuthenticator;
import com.att.nsa.security.db.simple.NsaSimpleApiKey;
import org.apache.tomcat.util.codec.binary.Base64;
import org.onap.dcae.commonFunction.CommonStartup;
import org.onap.dcae.commonFunction.VESLogger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.URL;
import javax.servlet.ServletException;

public class RestfulCollectorServlet extends CommonServlet {

    String authid;
    String authpwd;
    String authlist;

    public RestfulCollectorServlet(rrNvReadable settings) throws loadException, missingReqdSetting {
        super(settings, "collector", false);
        authid = settings.getString(CommonStartup.kSetting_authid, null);
        if (authid != null) {
            String authpwdtemp = settings.getString(CommonStartup.kSetting_authpwd, null);
            authpwd = new String(Base64.decodeBase64(authpwdtemp));
        }
        authlist = settings.getString(CommonStartup.kSetting_authlist, null);
    }


    /**
     * This is called once at server start. Use it to init any shared objects and setup the route mapping.
     */
    @Override
    protected void servletSetup()
        throws rrNvReadable.missingReqdSetting, rrNvReadable.invalidSettingValue, ServletException {
        super.servletSetup();

        try {
            // the base class provides a bunch of things like API authentication and ECOMP compliant
            // logging. The Restful Collector likely doesn't need API authentication, so for now,
            // we init the base class services with an in-memory (and empty!) config DB.
            commonServletSetup(ConfigDbType.MEMORY);

            VESLogger.setUpEcompLogging();

            // setup the servlet routing and error handling
            final DrumlinRequestRouter drr = getRequestRouter();

            // you can tell the request router what to do when a particular kind of exception is thrown.
            drr.setHandlerForException(IllegalArgumentException.class, new DrumlinErrorHandler() {
                @Override
                public void handle(DrumlinRequestContext ctx, Throwable cause) {
                    sendJsonReply(ctx, HttpStatusCodes.k400_badRequest, cause.getMessage());
                }
            });

            // load the routes from the config file
            final URL routes = findStream("routes.conf");
            if (routes == null) {
                throw new rrNvReadable.missingReqdSetting("No routing configuration.");
            }
            final DrumlinPlayishRoutingFileSource drs = new DrumlinPlayishRoutingFileSource(routes);
            drr.addRouteSource(drs);

            if (CommonStartup.authflag > 0) {
                NsaAuthenticator<NsaSimpleApiKey> nsaAuth = new SimpleAuthenticator();
                if (authlist != null) {
                    String[] authpair = authlist.split("\\|");
                    for (String pair : authpair) {
                        String[] lineid = pair.split(",");
                        String listauthid = lineid[0];
                        String listauthpwd = new String(Base64.decodeBase64(lineid[1]));
                        ((SimpleAuthenticator) nsaAuth).add(listauthid, listauthpwd);
                    }

                } else if (authid != null) {
                    ((SimpleAuthenticator) nsaAuth).add(authid, authpwd);
                } else {
                    //add a default test account
                    ((SimpleAuthenticator) nsaAuth).add("admin", "collectorpasscode");
                }
                this.getSecurityManager().addAuthenticator(nsaAuth);
            }

            log.info("Restful Collector Servlet is up.");
        } catch (SecurityException | IOException | ConfigDbException e) {
            throw new ServletException(e);
        }
    }


    private static final long serialVersionUID = 1L;
    private static final Logger log = LoggerFactory.getLogger(RestfulCollectorServlet.class);
}